Paul O'Brien: List of Refereed Publications

(Other papers, Home)

Luminosity-time and luminosity-luminosity correlations for GRB prompt and afterglow plateau emissions. Dainotti, M., et al., 2015, MNRAS, in press (preprint)
A Multiwavelength Study of the Relativistic Tidal Disruption Candidate Swift J2058.4+0516 at Late Times. Pasham, D.R., et al., 2015, ApJ, 805, 68 (13p) (preprint)
Accessing the population of high-redshift Gamma Ray Bursts. Ghirlanda, G. et al., 2015, MNRAS, 448, 2514-2524 (preprint)
Broad-band modelling of short gamma-ray bursts with energy injection from magnetar spin-down and its implications for radio detectability. Gompertz, B.P., van der Horst, A.J., O'Brien, P.T., Wynn, G.A., Wiersema, K., 2015, MNRAS, 448, 629-641 (preprint)
Constraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlations. Rowlinson, A., Gompertz, B.P., Dainotti, M., O'Brien, P.T., Wijers, R.A.M.J., van der Horst, A.J., 2014, MNRAS, 443, 1779-1787 (preprint)
Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S. Abramwski, A. et al., 2014, A&A, 565, 16 (6p) (preprint)
Circular polarization in the optical afterglow of GRB 121024A. Wiersema, K. et al., 2014, Nature, 509, 201-204
Cherenkov Telescope Array is well suited to follow up Gravitational Wave Transients. Bartos, I. et al., 2014, MNRAS, 433, 738-749 (preprint)
GRB 130925: an ultra-long Gamma-Ray Burst with a dust-echo afterglow, and implications for the origin of ultra-long GRBs. Evans, P.A. et al., 2014, MNRAS, 444, 250-267 (preprint)
GRB 120422A/SN 2012bz: Bridging the Gap between Low- And High-Luminosity GRBs. Schulze, S., et al., 2014, ApJ, 566, 102 (31p) (preprint)
Revealing the location and structure of the accretion disk-wind in PDS 456. Gofford, J., et al., 2014, ApJ, 784, 77 (9p) (preprint)
GRB 130427A: A nearby ordinary monster. Maselli, A., et al., 2014, Science, 343, 48-51 (preprint)
New constraints on gamma-ray burst jet geometry and relativistic shock physics. Guidorzi, C., et al., 2014, MNRAS, 438, 752-767 (preprint)
Magnetar powered GRBs: explaining the extended emission and X-ray plateau of short GRB light curves. Gompertz, B.P., O'Brien, P.T., Wynn, G.A., 2014, MNRAS, 438, 240-250 (preprint)
On the nature of the `hostless' short GRBs. Tunnicliffe, R.L., et al., 2014, MNRAS, 437, 1495-1510 (preprint)
A new population of ultra-long duration gamma-ray bursts. Levan, A.J., et al., 2014, ApJ, 781, 13 (22p) (preprint)
Variability of the high-velocity outflow in the quasar PDS456. Reeves, J.N., et al., 2014, ApJ, 780, 45 (13p) (preprint)
Introducing the CTA concept. Acharya, B.S., et al., 2013, Astroparticle Physics, 43, 3-18 (preprint)
Are gamma-ray bursts the same at high redshift and low redshift? Littlejohns, O.M., Tanvir, N.R., Willingale, R., Evans, P.A., O'Brien, P.T., Levan, A.J., 2013, MNRAS, 436, 3640-3655 (preprint)
GRB 091024A and the Nature of Ultra-long Gamma-Ray Bursts. Virgili, F.J., et al., 2013, ApJ, 778, 54 (18p) (preprint)
Interpreting signals from Astrophysical Transient Experiments. O'Brien, P.T., Smartt, S.J., 2013, Phil Trans R Soc A, 371, 2012.0498 (preprint)
The transient gravitational-wave sky. Andresson, N., et al., 2013, Classical and Quantum Gravity, 30, 19 (45p) (preprint)
X-ray absorption evolution in Gamma-Ray Bursts: intergalactic medium or evolutionary signature of their host galaxies? Starling, R.L.C., Willingale, R., Tanvir, N.R., Scott, A.E., Wiersema, K., O'Brien, P.T., Levan, A.J., Stewart, G.C., 2013, MNRAS, 431, 3159-3176 (preprint)
Calibration of the X-ray absorption in our Galaxy. Willingale, R., Starling, R.L.C., Beardmore, A.P., Tanvir, N.R., O'Brien, P.T., 2013, MNRAS, 431, 394-404 (preprint)
Gamma-Ray Burst Science in the Era of the Cherenkov Telescope Array. Inoue, S., et al., 2013, Astroparticle Physics, 43, 252-275 (preprint)
Can magnetar spin-down power extended emission in some short GRBs? Gompertz, B., O'Brien, P., Wynn, G., Rowlinson, A., 2013, MNRAS, 431, 1745-1751 (preprint)
Signatures of magnetar central engines in short GRB light curves. Rowlinson, A., et al., 2013, MNRAS, 430, 1061-1087 (preprint)
Star formation in the early Universe: beyond the tip of the iceberg. Tanvir, N.R., et al., 2012, ApJ, 754, 46 (13p) (preprint)
Detailed optical and near-infrared polarimetry, spectroscopy and broadband photometry of the afterglow of GRB 091018: Polarisation evolution. Wiersema, K., et al., 2012, MNRAS, 426, 2-22 (preprint)
The origin of the early time optical emission of Swift GRB 080310. Littlejohns, O.M., et al., 2012, MNRAS, 421, 2692-2712 (preprint)
Panchromatic observations of the textbook GRB 110205A: constraining physical mechanisms of prompt emission and afterglow. Zheng, W., et al., 2012, ApJ, 751, 90-110 (preprint)
ORIGIN: Metal creation and evolution from the cosmic dawn. den Herder, J. W., et al., 2012, Experimental Astronomy, 34, 519-549 (preprint)
Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy. Actis, M., et al., 2011, Experimental Astronomy, 32, 193-316 (preprint)
A faint optical flash in dust-obscured GRB 080603A: implications for GRB prompt emission mechanisms. Guidorzi, C., et al., 2011, MNRAS, 417, 2124-2143 (preprint)
A Possible Relativistic Jetted Outburst from a Massive Black Hole Fed by a Tidally Disrupted Star. Bloom J.S., et al., 2011, Science, 333, 203-206 (preprint)
An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy. Levan, A.J., et al., 2011, Science, 333, 199-202 (preprint)
A Photometric Redshift of z ~9.4 for GRB 090429B. Cucchiara, A., et al., 2011, ApJ, 736, 7 (12p) (preprint)
A tale of two GRB-SNe at a common redshift of z=0.54. Cano, Z. et al., 2011, MNRAS, 413, 699-685 (preprint)
Suzaku observation of the LINER NGC 4102. Gonzalez-Martin, O. et al., 2011, A&A , 527, A142 (preprint)
Are all short-hard gamma-ray bursts produced from mergers of compact stellar objects? Virgili, F.J., Zhang, B., O'Brien, P., Troja, E., 2011, ApJ, 727, 109-122 (preprint)
The Late Peaking Afterglow of GRB 100418A. Marshall, F.E., et al., 2011, ApJ, 727, 132-140
Astrosat. O'Brien, P.T., 2011, Advances in Space Research, 47, 1451-1453
Swift follow-up of unidentified X-ray sources in the XMM-Newton Slew Survey. Starling, R. et al., 2011, MNRAS, 412, 1853-1869 (preprint)
The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar? Rowlinson, A. et al., 2010, MNRAS, 409, 531-540 (preprint)
The Swift Burst Analyser I: BAT and XRT spectral and flux evolution of Gamma Ray Bursts. Evans, P.A., et al., 2010, A&A, 519, A102 (preprint)
Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A. Rowlinson, A. et al., 2010, MNRAS, 408, 383-391 (preprint)
Discovery of the nearby long, soft GRB 100316D with an associated supernova Starling, R.L.C., et al., 2010, MNRAS, 411, 2792-2803 (preprint)
GRB 090902B: afterglow observations and implications. Pandey, S.B., et al., 2010, ApJ, 714, 799-804 (preprint)
GRB 081008: from burst to afterglow and the transition phase in between. Yuan, F., et al., 2010, ApJ, 711, 870-880 (preprint)
Remarkable spectral variability of PDS 456. Behar, E., Kaspi, S., Reeves, J., Turner, T.J., Mushotzky, R., O'Brien, P.T., 2010, ApJ, 712, 26-37 (preprint)
A new analysis of the short-duration, hard-spectrum GRB 051103, a possible extragalactic SGR giant flare. Hurley, K., et al, 2010, MNRAS, 403, 342-352 (preprint)
The spectral-temporal properties of the prompt pulses and rapid decay phase of GRBs. Willingale, R., Genet, F., Granot, J., O'Brien, P.T., 2010, MNRAS, 403, 1296-1316 (preprint)
Late time observations of GRB080319B: jet break, host galaxy and accompanying supernova. Tanvir, N.R., et al., 2010, ApJ, 725, 625-632 (preprint)
Going out with a bang: compact object collisions resulting from supernovae in binary systems. Troja, E., Wynn, G.A., O'Brien, P.T., Rosswog, S., 2010, MNRAS, 401, 1381-1387 (preprint)
Can X-ray emission powered by a spinning-down magnetar explain some GRB light curve features? Lyons, N., O'Brien, P.T., Zhang, B., Willingale, R., Troja, E., Starling, R.L.C., 2010, MNRAS, 402, 705-712 (preprint)
Multi-wavelength observations of the energetic GRB 080810: detailed mapping of the broadband spectral evolution. Page, K.L. et al., 2009, MNRAS, 400, 134-146 (preprint)
A Compton-thick wind in the high luminosity quasar, PDS 456. Reeves, J.N. et al., 2009, ApJ, 701, 493-507 (preprint)
Rise and fall of the X-ray flash 080330: an off-axis jet? Guidorzi, C. et al., 2009, A&A, 499, 439-453 (preprint)
The unusual X-ray light curve of GRB 080307: the onset of the afterglow? Page, K.L., et al., 2009, MNRAS, 395, 328-334 (preprint)
Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs. Evans, P.A., et al., 2009, MNRAS, 397, 1177-1201 (preprint)
Constraining the energy budget of GRB 080721. Starling, R.L.C., et al., 2009, MNRAS, 400, 90-99 (preprint)
In search of progenitors for supernova-less GRBs 060505 and 060614: re-examination of their afterglows. Xu, D., et al., 2009, ApJ, 696, 971-979 (preprint)
The dust scattering model can not explain the shallow X-ray decay in GRB afterglows. Shen, R.-F., Willingale, R., Kumar, P., O'Brien, P.T., Evans, P.A., MNRAS, 2009, 393, 598-606 (preprint)
Correlations of prompt and afterglow emission in Swift long and short gamma-ray bursts. Gehrels, N., et al., 2008, ApJ, 689, 1161-1172 (preprint)
GRB 080319B: A Naked-Eye Stellar Blast from the Distant Universe. Racusin, J.l., et al., 2008, Nature, 455, 183-187 (preprint)
Multiwavelength analysis of the intriguing GRB 061126: the reverse shock scenario and magnetization. Gomboc, A. et al., 2008, ApJ, 687, 443-455 (preprint)
The Early-time Optical Properties of Gamma-Ray Burst Afterglows. Melandri, A. et al., 2008, ApJ, 686, 1209-1230 (preprint)
The extreme, red afterglow of GRB060923A: Distance or dust? Tanvir, N.R. et al., 2008, MNRAS, 388, 1743-1750 (preprint)
On the nature of late X-ray flares in Swift Gamma-Ray Bursts. Curran, P.A. et al., 2008, A&A, 487, 533-538 (preprint)
An extremely luminous X-ray outburst marking the birth of a normal supernova. Soderberg, A.M. et al., 2008, Nature, 7194, 469-474 (preprint)
Line searches in Swift X-ray spectra. Hurkett, C.P. et al., 2008, ApJ, 679, 587-606 (preprint)
Swift captures the spectrally evolving prompt emission of GRB 070616. Starling, R.L.C. et al., 2008, MNRAS, 384, 504-514 (preprint)
GRB 070724B: the first gamma-ray burst localised by SuperAGILE and its Swift X-ray afterglow. Del Monte, E. et al., 2008, A&A, 478, L5-L9 (preprint)
Different progenitors of short hard gamma-ray bursts. Troja, E., King, A.R., O'Brien, P.T., Lyons, N., Cusumano, G., 2007, MNRAS, 385, L10-L14 (preprint)
Swift ultraviolet photometry of the Deep Impact encounter with Comet 9P/Tempel 1. Mason, K.O. et al., 2007, Icarus, 191, Supplement 1, 286-294
Gamma-ray Bursts in the Swift era. O'Brien, P.T., Willingale, R., 2007, Astrophysics and Space Science, 311, 167-175
A universal GRB photon energy-peak luminosity relation. Willingale, R., O'Brien, P.T., Goad, M.R., Osborne, J.P., Page, K.L., Tanvir, N.R., 2007, ApJ, submitted (preprint)
GRB 061121: Broadband spectral evolution through the prompt and afterglow phases of a bright burst. Page, K.P., et al., 2007, ApJ, 663, 1125-1138 (preprint)
GRB051022: physical parameters and extinction of a prototype dark burst. Rol, E., et al., 2007, ApJ, 669, 1098-1106 (preprint)
An on-line repository of Swift/XRT light curves of GRBs. Evans, P.A. et al., 2007, A&A, 469, 379-385 (preprint)
GRB 050410 and GRB 050412: are they really dark GRBs? Mineo, T., et al., 2007, A&A, 469, 663-669 (preprint)
Detection of GRB 060927 at z=5.47: implications for the use of gamma-ray bursts as probes of the end of the dark ages. Ruiz-Velasco, A.E. et al., 2007, ApJ, 669, 1-9 (preprint)
Swift multi-wavelength observations of the bright flaring burst GRB 051117A. Goad, M.R. et al., 2007, A&A, 468, 103-112 (preprint)
GRB 050826: a subluminous event at z=0.296 finds its place in the luminosity distribution of gamma-ray burst afterglows. Mirabel, N., Halpern, J.P., O'Brien, P.T., 2007, ApJ, 661, L127-L130
A case of mistaken identity? GRB 060912A and the nature of the long - short divide. Levan, A.J. et al., 2007, MNRAS, 378, 1439-1446 (preprint)
The first survey of X-ray flares from gamma-ray bursts observed by Swift: temporal properties and morphology. Chincarini, G. et al., 2007, ApJ, 671, 1903-1920 (preprint)
Swift and XMM-Newton Observations of the Extraordinary GRB 060729: An afterglow with a more than 100 days X-ray light curve. Grupe, D. et al., 2007, ApJ, 662, 443-458 (preprint)
The nature of the outflow in gamma-ray bursts. Kumar, P. et al., 2007, MNRAS, 376, L57-L61 (preprint)
GRB 050822: detailed analysis of an XRF observed by Swift.. Godet, O. et al., 2007, A&A, 471, 385-394 (preprint)
Swift observations of GRB 070110: an extraordinary X-ray afterglow powered by the central engine. Troja, E. et al., 2007, ApJ, 665, 599-607 (preprint)
The Swift gamma-ray burst GRB 050422. Beardmore, A.P. et al., 2007, MNRAS, 374, 1473-1478
The late X-ray afterglow of gamma-ray bursts. Willingale, R., O'Brien, P.T., 2007, Phil. Trans. Roy. Soc. A., 365, 1189-1195
Using Swift observations of prompt and afterglow emission to classify GRBs. O'Brien, P.T., Willingale, R., 2007, Phil. Trans. Roy. Soc. A., 365, 1179-1188 (preprint)
An Update on the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007: Swift observations of UV variability and persistence of X-ray faintness. Grupe, D., Schady, P., Leighly, K.M., O'Brien, P., Nousek, J.A., 2007, AJ, 133, 1988-1994 (preprint)
The prompt to late-time multiwavelength analysis of GRB 060210. Curran, P.A. et al., 2007, A&A, 467, 1049-1055 (preprint)
Testing the standard fireball model of GRBs using late X-ray afterglows measured by Swift. Willingale, R. et al., 2007, ApJ, 662, 1093-1110 (preprint)
The circumburst environment of a FRED GRB: study of the prompt emission and X-ray/optical afterglow of GRB 051111. Guidorzi, C. et al., 2007, A&A, 463, 539-550 (preprint)
The early and late-time spectral and temporal evolution of GRB 050716. Rol, E. et al., 2007, MNRAS, 374, 1078-1084 (preprint)
Swift discovery of Gamma-ray Bursts without jet-break features in their X-ray afterglows. Sato, G. et al., 2007, ApJ, 657, 359-366 (preprint)
The Remarkable Afterglow of GRB 061007: Implications for Optical Flashes and GRB Fireballs. Mundell, C.G. et al., 2007, ApJ, 660, 489-495 (preprint)
GRB radiative efficiencies derived from the Swift data: GRBs.vs. XRFs, longs vs. Short. Zhang, B. et al., 2007, ApJ, 655, 989-1001 (preprint)
Swift ultraviolet photometry of the Deep Impact encounter with Comet 9P/Tempel 1. Mason, K.O. et al., 2007, Icarus, 187, 121-131
Long-term monitoring of the X-ray afterglow of GRB050408 with Swift/XRT. Capalbi, M. et al., 2007, A&A, 462, 913-918
A new gamma-ray burst classification scheme from GRB 060614. Gehrels, N. et al., 2006, Nature, 444, 1044-1046 (preprint)
Anatomy of a dark burst - the afterglow of GRB 060108. Oates, S.R. et al., 2006, MNRAS, 372, 327-337 (preprint)
Swift XRT observations of the Deep Impact collision. Willingale, R. et al., 2006, ApJ, 649, 541-552
The first Swift X-ray flash: The faint afterglow of XRF 050215B. Levan, A.J. et al., 2006, ApJ, 648, 1132-1138 (preprint)
Early multi-wavelength emission from Gamma-ray Bursts: from Gamma-ray to X-ray. O'Brien, P.T., Willingale, R., Osborne, J.P., Goad, M.R., 2006, New J. Phys., 8, 121-139 (preprint)
The multiwavelength afterglow of GRB 050721: a puzzling rebrightening seen in the optical but not in the X-ray. Angelo Antonelli, L. et al., 2006, A&A, 456, 509-515 (preprint)
Evidence for chromatic X-ray light-curve breaks in Swift GRB afterglows and their theoretical implications. Panaitescu, A., Meszaros, P., Burrows, D., Nousek, J., Gehrels, N., O'Brien, P., Willingale, R., 2006, MNRAS, 369, 2059-2064 (preprint)
Swift observations of the highly X-ray variable Narrow Line Seyfert 1 galaxy RX J0148.3-2758. Grupe, D., Leighly, M.K., Komossa, S., Schady, P., O'Brien, P.T., Burrows, D.N., Nousek, J.A., 2006, AJ, 132, 1189-1201 (preprint)
An optical supernova associated with the X-ray flash XRF 060218. Pian, E. et al., 2006, Nature, 442, 1011-1013 (preprint)
The shock break-out of GRB 060218/SN 2006aj. Campana, S. et al., 2006, Nature, 442, 1008-1010 (preprint)
GRB051210: Swift detection of a short gamma ray burst. La Parola, V. et al., 2006, A&A, 454, 753-757 (preprint)
X-ray flares in the early Swift observations of the possible naked gamma-ray burst 050421. Godet, O. et al., 2006, A&A, 452, 819-825
A historic jet-emission minimum reveals hidden spectral features in 3C273. Turler, M. et al., 2006, A&A, 451, L1-L4 (preprint)
Panchromatic study of GRB060124: from precursor to afterglow Romano, P. et al., 2006, A&A, 456, 917-927 (preprint)
GRB 050505: A high redshift burst discovered by Swift. Hurkett, C.P. et al., 2006, MNRAS, 368, 1101-1109 (preprint)
Testing the curvature effect and internal origin of gamma-ray burst prompt emissions and X-rays flares with Swift data. Liang, E.W. et al., 2006, ApJ, 646, 351-357 (preprint)
The early X-ray emission from GRBs. O'Brien, P.T. et al., 2006, ApJ, 647, 1213-1237 (preprint)
Swift observations of GRB 050603: an afterglow with a steep late time decay slope. Grupe, D. et al., 2006, ApJ, 645. 464-469 (preprint)
The X-ray afterglow of the short gamma ray burst 050724. Campana, S. et al., 2006, A&A, 454, 113-117 (preprint)
The giant X-ray flare of GRB050502B: Evidence for late-time engine activity. Falcone, A.D. et al., 2006, ApJ, 641, 1010-1017 (preprint)
Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A. Goad, M.R. et al., 2006, A&A, 449, 89-100 (preprint)
X-ray flare in XRF050406: evidence for prolonged engine activity. Romano, P. et al., 2006, A&A, 450, 59-68 (preprint)
Evidence for a canonical GRB afterglow light curve in the Swift/XRT data. Nousek, J.A. et al., 2006, ApJ, 642, 389-400 (preprint)
Discovery and identification of the very high redshift afterglow of GRB050904. Haislip, J.B. et al., 2006, Nature, 440, 181-183 (preprint)
Optical emission from GRB050709: a short/hard GRB in a star-forming galaxy. Covino, S. et al., 2006, A&A, 447, L5-L8 (preprint)
Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211. Vreeswijk, P.M. et al., 2006, A&A, 447, 145-156 (preprint)
The dust-scattered X-ray halo around Swift GRB050724 Vaughan, S. et al., 2006, ApJ, 639, 323-330 (preprint)
Swift XRT observations of the afterglow of GRB 050319. Cusumano, G. et al., 2006, ApJ, 639, 316-322 (preprint)
GRB 050117: Simultaneous Gamma-ray and X-ray Observations with the Swift Satellite. Hill, J.E. et al., 2006, ApJ, 639, 303-311 (preprint)
Swift observations of the X-ray bright GRB 050315. Vaughan, S. et al., 2006, ApJ, 638, 920-929 (preprint)
GRB050911: A black hole-neutron star merger or a naked GRB. Page, K.L. et al., 2006, ApJ, 637, L13-L16 (preprint)
Swift panchromatic observations of the bright gamma-ray burst GRB050525a. Blustin, A.J. et al., 2006, ApJ, 637, 901-913 (preprint)
The soft X-ray blast in the apparently sub-luminous GRB 031203. Watson, D. et al., 2006, ApJ, 636, 967-970 (preprint)
An origin for short gamma-ray bursts unassociated with current star formation. Barthelmy, S.D. et al., 2005, Nature, 438, 994-996 (preprint)
Discovery of an Afterglow Extension of the Prompt Phase of Two Gamma Ray Bursts Observed by Swift. Barthelmy, S.D. et al., 2005, ApJ, 635, L133-L136 (preprint)
Swift XRT Observations of the Breaking X-ray Afterglow of GRB 050318 Perri, M. et al., 2005, A&A, 442, L1-L5 (preprint)
XMM-newton spectroscopy of high-redshift QSOs Page, K.L., Reeves, J.N., O'Brien, P.T., Turner, M.J.L., 2005, MNRAS, 364, 195-207 (preprint)
Gamma-ray bursts: restarting the engine. King, A., O'Brien, P.T., Goad, M.R., Osborne, J., Ollson, E., Page, K., 2005, ApJ, 630, L113-115 (preprint)
GRB050223: A faint Gamma-Ray Burst discovered by Swift Page, K.L. et al., 2005, MNRAS, 363, L76-L80 (preprint)
Bright X-ray flares in gamma-ray burst afterglows. Burrows, D.N. et al., 2005, Science, 309, 1833-1835 (preprint)
A short gamma-ray burst apparently associated with an elliptical galaxy at redshift z=0.225. Gehrels, N. et al., 2005, Nature, 437, 851-854 (preprint)
An unexpectedly rapid decline in the X-ray afterglow emission of long gamma-ray bursts. Tagliaferri, G. et al., 2005, Nature, 436, 985-988 (preprint)
The connection between ultraviolet and X-ray outflows in AGN: the case of PDS 456. O'Brien, P.T., Reeves, J.N., Simpson, C., Ward, M.J., 2005, MNRAS, 360, L25-L29 (preprint)
Swift X-ray telescope and VLT observations of the afterglow of GRB 041223. Burrows, D.N., et al., 2005, ApJ, 622, L85-L88 (preprint)
Resolving the large scale spectral variability of the luminous Seyfert 1 galaxy 1H 0419-577: Evidence for a new emission component and absorption by cold dense matter. Pounds, K.A., Reeves, J.N., Page, K.L., O'Brien, P.T., 2004, ApJ, 616, 696-706 (preprint)
XMM-Newton observations of high luminosity radio-quiet QSOs. Page, K.L., Reeves, J.N., O'Brien, P.T., Turner, M.J.L., Worrall, D.M., 2004, MNRAS, 353, 133-142 (preprint)
XMM-Newton observations of seven soft excess QSOs. Page, K.L., Schartel, N., Turner, M.J.L., O'Brien, P.T., 2004, MNRAS, 352, 523-534 (preprint)
XMM-Newton EPIC observations of 21 low-redshift quasars. Porquet, D., Reeves, J.N., O'Brien, P.T., Brinkmann, W., 2004, A&A, 422, 85-95 (preprint)
An XMM-Newton observation of the Seyfert galaxy 1H 0419-577 in an extremely low state. Pounds, K.A., Reeves, J.N., Page, K.L., O'Brien, P.T., 2004, ApJ, 605, 670-676 (preprint)
A very low luminosity X-ray flash: XMM-Newton observations of GRB 031203. Watson, D., Hjorth, J., Levan, A., Jakobsson, P., O'Brien, P.T., Osborne, J.P., Pedersen, K., Reeves, J.N., Tedds, J.A., Vaughan, S.A., Ward, M.J., Willingale, R., 2004, ApJL, 605, L101-104 (preprint)
The discovery of an evolving dust scattered X-ray halo around GRB 031203. Vaughan, S. Willingale, R. O'Brien, P.T., Osborne, J.P., Reeves, J.N., Levan, A.J., Watson, M.G., Tedds, J.A., Watson, D., Santos-Lleo, M., Rodriguez-Pascual, P.M., Schartel, N., 2004, ApJ, 603, L5-L8 (preprint)
XMM-Newton observations of 3C 273. Page, K.L., Turner, M.J.L., Done, C., O'Brien, P.T., Reeves, J.N., Sembay, S., Stuhlinger, M., 2004, MNRAS, 349, 57-67 (preprint)
The X-ray, optical and radio evolution of the GRB030329 afterglow and the associated SN2003dh. Willingale, R., Osborne, J.P., O'Brien, P.T., Ward, M.J., Levan, A., Page, K.L., 2004, MNRAS, 349, 31-38 (preprint)
XMM-Newton observation of the Seyfert 1 ESO 198-G24. Porquet, D. Kaastra, J.S., Page, K.L., O'Brien, P.T., Ward, M.J., Dubau, J., 2004, A&A, 413, 913-920 (preprint)
An X-ray Baldwin effect for the narrow Fe K-alpha lines observed in Active Galactic Nuclei. Page, K.L., O'Brien, P.T., Reeves, J.N., Turner, M.J.L., 2004, MNRAS, 347, 316-322 (preprint)
Evidence of a high velocity ionised outflow in a second narrow line quasar PG0844+349. Pounds, K.A., King, A.R., Page, K.L., O'Brien, P.T., 2003, MNRAS, 346, 1025-1030 (preprint)
Simultaneous observations of the quasar 3C 273 with INTEGRAL, XMM-Newton and RXTE. Courvoisier, T.J.-L., Beckmann, V., Bourban, G., Chenevez, J., Chernyakova, M., Deluit, S., Favre, P., Grindlay, J.E., Lund, N., O'Brien, P., Page, K., Produit, N., Turler, M., Turner, M.J.L., Staubert, R., Stuhlinger, M., Walter, R., Zdziarski, A.A., 2003, A&A, 411, L343-L348 (preprint)
A massive X-ray outflow from the quasar PDS 456. Reeves, J.N., O'Brien, P.T., Ward, M.J., 2003, ApJ, 593, L65-L68 (preprint)
A high velocity ionised outflow and soft X-ray photosphere in the narrow emission line quasar PG1211+143. Pounds, K.A., Reeves, J.N., King, A.R., Page K.L., O'Brien, P.T., Turner, M.J.L., 2003, MNRAS, 345, 705-713 (preprint)
Detection of type-2 quasars in the radio galaxies B3 0731+438 and 3C 257. Derry, P.M., O'Brien, P.T., Reeves, J.N., Ward, M.J., Imanishi, M., Ueno, S., 2003, MNRAS, 342, L53-L57 (preprint)
Fe K emission and absorption features in XMM-Newton spectra of Mkn 766 - evidence for reprocessing in flare ejecta. Pounds, K.A., Reeves, J.N., Page K.L., Wynn, G.A., O'Brien, P.T., 2003, MNRAS, 342, 1147-1155 (preprint)
Soft X-ray emission lines in the afterglow spectrum of GRB 011211: a detailed XMM-Newton analysis. Reeves, J.N., Watson, D., Osborne, J.P., Pounds, K.A., O'Brien, P.T., 2003, A&A, 403, 463-472
An XMM-Newton observation of the narrow line Seyfert 1 galaxy, Mrk 896. Page, K.L., O'Brien, P.T., Reeves, J.N., Breeveld, A.A., 2003, MNRAS, 340, 1051-1056 (preprint)
The remarkably featureless high resolution X-ray spectrum of Mrk 478. Marshall, H.L., Edelson, R.A., Vaughan, S., Malkan, M., O'Brien, P.T., Warwick, R., 2003, AJ, 125, 459-464 (preprint)
Radio-quiet AGN in the XMM-Newton fields of Markarian 205 and QSO 0130-403. Page, K.L., Turner, M.J.L., Reeves, J.N., O'Brien, P.T., Sembay, S., 2003, MNRAS, 338, 1004-1012 (preprint)
The X-ray spectrum of the Seyfert 1 galaxy Mrk766: Dusty warm absorber or relativistic emission lines? Mason, K.O., Branduardi-Raymont, G., Ogle, P., Page, M.J., Puchnarewicz, E.M., Behar, E., Cordova, F.A., Davis, S., Maraschi, L., McHardy, I.M., O'Brien, P.T., Preidhorsky, W.C., Sasseen, T.P., 2003, ApJ, 582, 95-104 (preprint)
Extreme X-ray variability in the luminous quasar PDS 456. Reeves, J.N., Wynn, G., O'Brien, P.T., Pounds, K.A., 2002, MNRAS, 336, L56-L60 (preprint)
The X-ray afterglow of GRB 020322. Watson, D., Reeves, J.N., Osborne, J.P., Tedds, J.A., O'Brien, P.T., Tomas, L., Ehle, M., 2002, A&A, 395, L41-L45 (preprint)
The X-ray afterglows of gamma-ray burst GRB 001025A and GRB 010220 observed with XMM-Newton. Watson, D., Reeves, J.N., Osborne, J., O'Brien, P.T., Pounds, K.A., Tedds, J.A., Santos-Lleo, M., Ehle, M., 2002, A&A, 393, L1-L5 (preprint)
The signature of supernova ejecta in the X-ray afterglow of the gamma-ray burst 011211. Reeves, J.N., Watson, D., Osborne, J.P., Pounds, K.A., O'Brien, P.T., Short, A.D.T., Turner, M.J.L., Watson, M.G., Mason, K.O., Ehle, M., Schartel, N., 2002, Nature, 416, 512-515 (preprint)
The variable X-ray spectrum of the luminous Seyfert 1 galaxy 1H 0419-577 - evidence for Comptonisation. Page, K., Pounds, K.A., Reeves, J.N., O'Brien, P.T., 2002, MNRAS, 330, L1-L5
An XMM-Newton observation of the extreme Narrow Line Seyfert 1 Galaxy, Mrk 359. O'Brien, P.T., Page, K. Reeves, J.N., Pounds, K.A., Turner, M.J.L., Puchnarewicz, E.M., 2001, MNRAS, 327, L37-L41
An XMM-Newton observation of the luminous Seyfert 1 galaxy Markarian 509. Pounds, K., Reeves, J., O'Brien, P.T., Page, K., Turner, M.J.L., Nayakshin, S., 2001, ApJ, 559, 181-186
Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. II. Ultraviolet Continuum and Emission-line Variability. Collier, S. et al.  2001, ApJ, 561, 146-161
The identification of an optical counterpart to the super-Eddington X-ray source, NGC~5204 X-1. Roberts, T.P., Goad, M.R., Ward, M.J., Warwick, R.S., O'Brien, P.T, Hands, A.D.P., 2001, MNRAS, 325, L7-L11
Monitoring of the Optical and 2.5 - 11.7 micron Spectrum and Mid-IR imaging of the Seyfert 1 Galaxy Mrk 279 with ISO. Santos-Lleo, M. et al. 2001, A&A, 2001, 369, 57-64
Detection of an X-ray periodicity in the Narrow-Line Seyfert 1 Galaxy Mrk 766 with XMM-Newton. Boller, Th., Keil, R., Trumper, J., O'Brien, P.T., Reeves, J.N., Page, M., 2001, A&A, 365, L146-L151
XMM-Newton observation of an unusual iron line in the quasar Markarian 205. Reeves, J.N., Turner, M.J.L., Pounds, K.A., O'Brien, P.T., Boller, Th., Ferrando, P., Kendziorra, E., Vercellone, S., 2001, A&A, 365, L134-L139
XMM-Newton monitoring of X-ray variability in the Quasar PKS 0558-504. Gliozzi, M., Brinkmann, W., O'Brien, P.T., Reeves, J.N., Pounds, K.A., Trifoglio, M., Gianotti, F., 2001, A&A, 365, L128-L133
XMM-Newton Detection of a Comptonized Accretion Disc in the Quasar PKS 0558-504. O'Brien, P.T., Reeves, J.N., Turner, M.J.L., Pounds, K.A., Page, M., Gliozzi, M., Brinkmann, W., Stephen, J.B., Dadina, M., 2001, A&A, 365, L122-L127
The first XMM-Newton spectrum of a high redshift quasar - PKS 0537-286. Reeves, J.N., Turner, M.J.L., Bennie, P.J., Pounds, K.A., Short, A., O'Brien, P.T., Boller, Th., Kuster, M., Tiengo, A., 2001, A&A, 365, L116-L121
The Complex X-ray Absorbers of NGC 3516 observed by BeppoSAX . Costantini, E. Nicastro, F., Fruscione, A., Mathur, S., Comastri, A., Elvis, M., Fiore, F., Salvini, C., Stirpe, G.M., Vignali, C., Wilkes, B., O'Brien, P.T., Goad, M.R., 2000, ApJ, 544, 283
Coronal Line Emission from NLS1s. O'Brien, P.T., Bleackley, P.J., 2000, New Astronomy Reviews, 44 (Issue 7-9), 543
Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing. Edelson, R., Koratkar, A., Nandra, K., Goad, M., Peterson, B.M., Collier, S., Fruchter, A., Krolik, J., Malkan, M., Maoz, D., O'Brien, P., Shull, J.M., Vaughan, S., Warwick, R., 2000, ApJ, 534, 180
PDS 456: An Extreme Accretion Rate Quasar? Reeves, J.N., O'Brien, P.T., Vaughan, S., Law-Green, D., Ward, M., Simpson, C., Pounds, K.A., Edelson, R.A., 2000, MNRAS, 312, L17
NGC 3516: The Long-term Variability of the AGN Emission-line and Absorption-line Regions. Goad, M.R., Koratkar, A., Kim, J., Korista, K.T., O'Brien, P.T., Axon, D.J., 1999, ApJ, 524, 707
On the Absence of Broad MgII Emission-line Variability in NGC 3516 during 1996. Goad, M.R., Kortakar, A.P., Axon, D.J., Korista, K.T., O'Brien, P.T., 1999, ApJL , 512, L95
Optical and X-ray Variability in the Least Luminous AGN, NGC 4395. Lira, P., Lawrence, A., O'Brien, P.T., Johnson, R., Terlevich, R., Bannister, N., 1999, MNRAS, 305, 109
The Optical Variability of the Narrow Line Seyfert 1 Galaxy, IRAS 13224-3809. Young, A.J., Crawford, C.S., Fabian, A.C., Brandt, W.N., O'Brien, P.T., 1999, MNRAS, 304, L46
The Effect of an Attenuated Continuum on the Coronal Line Spectrum of NGC 1068 and the Circinus Galaxy. Nazarova, L.S., O'Brien, P.T., Ward, M.J., 1999, A&A, 343, 682
Optical and Infrared Observations of the Luminous Quasar PDS 456: A radio-quiet analogue of 3C 273. Simpson, C., Ward, M., O'Brien, P., Reeves, J., 1999, MNRAS, 303, L23
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XIII. Ultraviolet Observations of the Broad-Line Radio Galaxy 3C 390.3. O'Brien, P.T. et al. 1998, ApJ, 509, 163
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. The Ground-based Monitoring Campaign of 3C 390.3. Dietrich, M. et al. 1998, ApJS, 115, 185
Modelling the ENLR in NGC1068. Nazarova, L.S., O'Brien, P.T., Ward, M.J., Gondhalekar, P.M., 1998, A&A, 331, 34
Jet-Induced Shocks in 3C 171: An Intermediate-Redshift Analogue of High Redshift Radio Galaxies. Clark, N.E., Axon, D.J., Tadhunter, C.N., Robinson, A., O'Brien, P.T. 1998, ApJ, 494, 546
AGN Watch Continuum Monitoring of Radio-quiet and Radio-loud AGN. O'Brien, P.T., Leighly, K.M. 1998, Adv. Space Res, 21, 67
Excitation of the Extended Gas in NGC 1068. Nazarova, L.S., O'Brien, P.T., Ward, M.J., Gondhalekar, P.M. 1997, Astrophysics and Space Science, 248, 121
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC 7469. Wanders, I. et al. 1997, ApJS, 113, 69
X-ray Observations of the Broad-Line Radio Galaxy 3C 390.3. Leighly, K.M. et al. 1997, ApJ, 483, 767
Evidence for Nonlinear X-ray Variability from the Broad-Line Radio Galaxy 3C 390.3. Leighly, K.M., O'Brien, P.T., 1997, ApJL,, 481, L15
The Extended Narrow Line Region in Mrk79. II. Modelling. Nazarova, L.S., O'Brien, P.T., Ward, M.J. 1997, A&A, 321, 397
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9. Rodriguez-Pascual, P.M. et al. 1997, ApJS, 110, 9
The Variability and Spectrum of NGC5548 in the Extreme Ultraviolet. Marshall, H.L. et al. 1997, ApJ, 479, 222
The Broad Emission line Region in AGNs and Quasars: The Impact of Variability Studies. Gondhalekar, P.M., Goad, M.R., O'Brien, P.T. 1996, Astrophysics and Space Science, 237, 207
The Extended Narrow Line Region in Mrk79. I. Observations. Nazarova, L.S., O'Brien, P.T., Ward, M.J. 1996, A&A, 307, 365
The Disappearing Broad Absorption Lines and Variable Emission Lines in NGC3516. Koratkar, A. et al., 1996, ApJ, 470, 378
Multiwavelength Observations of Short Time-Scale Variability in NGC4151. IV. Analysis of Multiwavelength Continuum Variability. Edelson, R.A. et al. 1996, ApJ, 470, 364
Multiwavelength Observations of Short Time-Scale Variability in NGC4151. I. Ultraviolet Observations. Crenshaw, D.M. et al. 1996, ApJ, 470, 322
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. VIII. An Intensive HST, IUE, and Ground-based Study of NGC5548. Korista, K.T. et al. 1995, ApJS, 97, 285
LAG Monitoring VI: The quasar Mkn 876. Erkens, U. et al. 1995,, A&A, 296, 90
Multi-Wavelength Monitoring of the BL Lac Object PKS 2155-304. IV. Multi-Wavelength Analysis. Edelson, R. et al. 1995, ApJ, 438, 120
The Luminosity Dependent Broad Line Region in Active Galactic Nuclei. O'Brien, P.T., Goad, M.R., Gondhalekar, P.M., 1995, MNRAS, 275, 1125
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. VI. Variability of NGC3783 from Ground-based Data. Stirpe, G.M. et al. 1994, ApJ, 425, 609
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. V. Variability of The Ultraviolet Continuum and Emission Lines of NGC3783. Reichert, G.A., et al. 1994, ApJ, 425, 582
LAG Monitoring V: The Seyfert 1 galaxy Markarian 279. Stirpe, G.M. et al. 1994, A&A, 285, 857
Response Functions as Diagnostics of the BLR in Active Galactic Nuclei. II. Anisotropic Line Emission. O'Brien, P.T., Goad, M.R.Ou, Gondhalekar, P.M., 1994, MNRAS, 268, 845
The Extended Narrow Line Region of NGC4151 II. Spatial Variations of the Emission Line Ratios. Robinson, A. et al. 1994, A&A, 291, 351
LAG Monitoring IV: The Seyfert 1 galaxy NGC4593. Dietrich, M. et al. 1994, A&A, 284, 33
LAG Monitoring III: The Size of the BLR in NGC3227. Salamanca, I. et al. 1994, A&A, 282, 742
Multiwavelength Monitoring of the BL Lac Object PKS 2155-304. I. The IUE Campaign. Urry, C.M. et al. 1993, ApJ, 411, 614
LAG Monitoring II: The Seyfert 1 Galaxy NGC3516. Wanders, I. et al. 1993, A&A, 269, 39
Response Functions as Diagnostics of the BLR in Active Galactic Nuclei. Goad, M.R., O'Brien, P.T., Gondhalekar, P.M., 1993, MNRAS, 263, 149
Monitoring of Active Galactic Nuclei. I. The Quasars 1302-102 and 1217+023. Jackson, N., et al. 1992, A&A, 262, 17
The Ultraviolet Continuum and Emission Line variability of 4C37.43. O'Brien, P.T., Gondhalekar, P.M., 1991, MNRAS, 250, 377
Ultraviolet Emission Line Variability in 3C273. O'Brien, P.T., Harries, T.J., 1991, MNRAS, 250, 133
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. (I) An Eight Month Monitoring Campaign of NGC5548 with IUE. Clavel, J., et al. 1991, ApJ, 366, 64
Line Ratios in the Extended Narrow Line Region of NGC4151. I. - Emission Line Ratios and their Implications. Penston, M.V. et al. 1990, A&A, 236, 53
The Structure of the BLR in Fairall 9. O'Brien, P.T., Zheng, W., 1990, Astrophysics and Space Science, 171, 77
Differential Line Development and the Complex Structure of the BLR in Fairall 9. Zheng, W., O'Brien, P.T., 1990b, ApJ, 356, 463
The Strength of Optical FeII Emission in QSOs. Zheng, W., O'Brien, P.T., 1990a, ApJ, 353, 433
Broad Emission Line Variability in 3C273. O'Brien, P.T., Zheng, W., Wilson, R., 1989, MNRAS, 240, 741
The Ultraviolet Continuum of Quasars. II. Continuum Variability. O'Brien, P.T., Gondhalekar, P.M., Wilson, R., 1988d, MNRAS, 233, 845
The Ultraviolet Continuum of Quasars. I. The Shape of the Continuum, Continuum Reddening, and Intervening Absorption. O'Brien, P.T., Gondhalekar, P.M., Wilson, R., 1988c, MNRAS, 233, 801
Lya Emission in Star-forming Galaxies. Hartmann, L.W., Huchra, J.P., Geller, M.J., O'Brien, P.T., Wilson, R., 1988, ApJ, 326, 101
Ultraviolet Spectra of Quasars in the Redshift Interval 0.3 to 2.0. Gondhalekar, P.M., O'Brien, P.T., Wilson, R., 1986a, MNRAS, 222, 71

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