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Publications

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My publications can also be accessed through NASA/ADS or ORCID:

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First Author

  1. O’Connor, B., Busmann, M., Freeburn, J., Hu, L., Klingler, N., Gruen, D., Andreoni, I., et al., 2026. Discovery of a Supernova Following the Einstein Probe Transient EP250302a at z = 1.131. Submitted to ApJ. Link

  2. O’Connor, B., Hall X., Busmann, M., Gruen, D., Floris, A., Cabrera, T., Zhu, Z., et al., 2026. EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-Lined Supernova. ApJL, 1006, L13. Link

  3. O’Connor, B., Busmann M., Hall, X., Taguchi, K., Tanaka, M., Gruen, D., Toshikage, S., et al., 2026. GRB 260310A/SN 2026fgk: Photometric and Spectroscopic Evolution of a Nearby GRB-Supernova and an Exceptionally Bright Afterglow at z=0.153. ApJ, 1006, 210. Link

  4. O’Connor, B., Hall, X. J., Cabrera, T., Hu, L., Palmese, A., et al., 2026. SN 2025adpq: A Type Ia supernova in a collisional ring formed during a major galaxy merger. The Open Journal of Astrophysics. Link

  5. O'Connor, B., Ricci, R., Troja, E., Palmese, A., Yang, Y.-H., et al. 2025. "AT2025ulz and S250818k: Deep X-ray and radio limits on off-axis afterglow emission and prospects for future discovery". Accepted to ApJL. Link

  6. O'Connor, B., Gill, R., DeLaunay, J., Hare, J., Pasham, D., et al. 2025. "Comprehensive X-ray Observations of the Exceptional Ultra-long X-ray and Gamma-ray Transient GRB 250702B with Swift, NuSTAR, and Chandra: Insights from the X-ray Afterglow Properties". ApJL, 994, L17. Link

  7. O'Connor, B., Beniamini, P., Troja, E., Busmann, M., Dichiara, S., et al. 2025. "The redshift distribution of Einstein Probe transients supports their relation to gamma-ray bursts". ApJL, 993 L37. Link

  8. O'Connor, B., Pasham, D. Andreoni, I., Hare, J., Beniamini, P., et al. 2025. "Characterization of a peculiar Einstein Probe transient EP240408a: an exotic gamma-ray burst or an abnormal jetted tidal disruption event?" ApJL, 979, L30. Link

  9. O’Connor, B., Beniamini, P., Gill, R. 2024. "X-ray Afterglow limits on the viewing angles of short gamma-ray bursts".  MNRAS, 533, 1629. Link

  10. O’Connor, B., Göğüş, E., Hare, J., Mukai, K., Huppenkothen, D., et al., 2023. "Classification of Swift J170800-402551.8 as an intermediate polar". MNRAS, 525, 5015. Link

  11. O’Connor, B., O’Connor, B., Kouveliotou, C., Evans, P. A., Gorgone, N., van Kooten, A. J., et al., 2023. "The Swift Deep Galactic Plane Survey (DGPS) Phase-I Catalog". ApJS, 269, 49. Link

  12. O’Connor, B., Brink, J., Buckley, D. A. H., Mukai, K., Kouveliotou, C., et al., 2023. "Discovery of 1RXS J165424.6-433758 as a polar cataclysmic variable". ApJ, 957, 89. Link

  13. O’Connor, B., Troja, E., Ryan, G., Beniamini, P., et al., 2023. "A structured jet explains GRB 221009A". Science Advances, 9, eadi1405. Press / Link

  14. O’Connor, B., Troja, E., Dichiara, S., Beniamini, P., et al. 2022. "A deep survey of short GRB host galaxies over z ~ 0−2: implications for offsets, redshifts, and environments". MNRAS, 515, 4890. Press / Link

  15. O’Connor, B., Göğüş, E., Huppenkothen, D., Kouveliotou, C., et al. 2021. "Identification of an X-Ray Pulsar in the BeXRB System IGR J18219-1347". ApJ, 927, 139. Link

  16. O’Connor, B., Troja, E., Dichiara, S., Chase, E. A., et al. 2021. "A tale of two mergers: constraints on kilonova detection in two short GRBs at z~0.5". MNRAS, 502, 1279. Link

  17. O’Connor, B., Beniamini, P., & Kouveliotou, C. 2020. "Constraints on the circumburst environments of short gamma-ray bursts". MNRAS, 495, 4782. Link

Co-Author

  1. Troja, E., O’Connor, B., Yang, Y.-H., Gauding, T., Yadav, M., et al., 2026. "A possible high-redshift origin for the short GRB061201: implications of a compact binary merger at cosmic noon". Submitted to ApJL.

  2. Skobe, H., O’Connor, B., Palmese, A., et al., 2026. "The host galaxies and merger environments of short and long gamma-ray bursts producing kilonovae." ApJ, 1009, 50.

  3. Busmann, M., O’Connor, B., Sommer, J., Gruen, D., et al., 2025. "The curious case of EP241021a: Unraveling the mystery of its exceptional rebrightening." A&A, 701, A225.

  4. Kaur, R., O’Connor, B., Palmese, A., Kunnumkai, K., 2026. "Detecting prompt and afterglow jet emission of gravitational-wave events from LIGO/Virgo/KAGRA and next-generation detectors." ApJ, 1000, 74.

  5. Freeburn, J., O’Connor, B., Cooke, J., Dobie, D., et al., 2025. "GRB 220831A: a hostless, intermediate Gamma-ray burst with an unusual optical afterglow". MNRAS, 537, 2061. doi:10.1093/mnras/staf147

  6. O’Grady, A. J. G., O’Connor, B., Goldberg, J., Joyce, M., Molnár, L., et al., 2025. "Betelgeuse's Buddy: X-Ray Constraints on the Nature of α Ori B". ApJ, 992, 107. doi:10.3847/1538-4357/adff83

  7. Srinivasaragavan, G., O’Connor, B., Cenko, S. B., et al., 2023. "A Sensitive Search for Supernova Emission Associated with the Extremely Energetic and Nearby GRB 221009A". ApJL, 949, L39.

  8. Chase, E. A., O’Connor, B., Fryer, C. L., Troja, E., et al., 2022. "Kilonova Detectability with Wide-field Instruments". ApJ, 927, 163.

  9. Troja, E., O’Connor, B., Ryan, G., Piro, L., et al., 2022. "Accurate flux calibration of GW170817: is the X-ray counterpart on the rise?". MNRAS, 510, 1902.

  10. Bruni, G., O’Connor, B., Matsumoto, T., Troja, E., et al., 2021. "Late-time radio observations of the short GRB 200522A: constraints on the magnetar model". MNRAS, 505, L41.

  11. Kunnumkai, K., Palmese, A., O’Connor, B., et al., 2026. "Wide Jets or Low Rates: Reconciling Short GRB and Gravitational-Wave Neutron Star Merger Rates". Submitted to ApJ.

  12. Hall, X., Palmese, A., O’Connor, B., Gruen, D., et al., 2026. "AT2025ulz and S250818k: Leveraging DESI Spectroscopy in the Hunt for a Kilonova Associated with a Subsolar-mass Gravitational-wave Candidate". ApJL, 1001, L20.

  13. Carney, J., Andreoni, I., O’Connor, B., Freeburn, J., Skobe, H., et al., 2025. "Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors". ApJL, 994, L46.

  14. Dichiara, S., Troja, E., O’Connor, B., Yang, Y.-H., et al., 2026. "A merger within a merger: Chandra pinpoints the short GRB 230906A in a peculiar environment". ApJL, 999, L42.

  15. Srinivasaragavan, G., Swain, V., O’Connor, B., Anand, S., et al., 2023. "Characterization of SN 2023pel Associated with GRB 230812B: An Energetic GRB with an Ordinary Broad-lined Type Ic Supernova". ApJL, 960, L18.

  16. Yang, Y.-H., Troja, E., O’Connor, B., Fryer, C. L., et al., 2023. "A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst". Nature, 626, 742.

  17. Troja, E., Fryer, C. L., O’Connor, B. (corresponding author), Ryan, G., et al., 2022. "A long gamma-ray burst from a stellar merger in the nearby Universe". Nature, 612, 228.

  18. Dichiara, S., Troja, E., O’Connor, B., Marshall, F. E., et al., 2020. "Short gamma-ray bursts within 200 Mpc". MNRAS, 492, 5011.

  19. Srinivasaragavan, G., Perley, D., Ho, A., O’Connor, B., et al., 2025. "Multi-Wavelength Analysis of AT 2023sva: a Luminous Orphan Afterglow With Evidence for a Structured Jet". MNRAS. doi:10.1093/mnras/staf290

  20. Cabrera, T., Palmese, A., Hu, L., O’Connor, B., et al., 2024. "Searching for electromagnetic emission in an AGN from the gravitational wave binary black hole merger candidate S230922g". PhRvD, 110, 123029. doi:10.1103/PhysRevD.110.123029

  21. Piro, L., Bruni, G., Troja, E., O’Connor, B., et al., 2021. "The fast radio burst FRB 20201124A in a star-forming region: Constraints to the progenitor and multiwavelength counterparts". A&A, 656, L15.

  22. Dichiara, S., Troja, E., Beniamini, P., O’Connor, B., et al., 2021. "Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs". ApJL, 911, L28.

  23. Becerra, R. L., Troja, E., Watson, A., O’Connor, B., et al., 2023. "Deciphering the unusual stellar progenitor of GRB 210704A". MNRAS, 522, 5204.

  24. Hall, X., Palmese, A., BenZvi, S., Banovetz, J., O’Connor, B., et al., 2026. "The DESI Transients Survey: Legacy Classifications and Methodology". ApJS, 285, 10.

  25. Freeburn, J., Dobie, D., Anumarlapudi, A., Andreoni, I., O’Connor, B., et al., 2026. "Prospects for GRB Afterglow Discovery with the Eric and Wendy Schmidt Observatory System". ApJ, 1007, 192.

  26. Fryer, C. L., Burns, E., Colosimo, J. M., Negro, M., O’Connor, B., 2026. "High-Energy Shock Breakout from Supernovae and Gamma-ray Bursts". Submitted.

  27. Granot, J., Perets, H., Gill, R., Beniamini, P., O’Connor, B., 2026. "A milli-Tidal Disruption Event Model for GRB 250702B: Main Sequence Star Disrupted by an IMBH". MNRAS, 547, stag328.

  28. Ryan, G., van Eerten, H., Troja, E., Piro, L., O’Connor, B., Ricci, R., 2024. "Modelling of Long-Term Afterglow Counterparts to Gravitational Wave Events: The Full View of GRB 170817A". ApJ, 975, 131.

  29. Gillanders, J. H., Troja, E., Fryer, C. L., Ristic, M., O’Connor, B., et al., 2023. "Heavy element nucleosynthesis associated with a gamma-ray burst". doi:10.48550/arXiv.2308.00633

  30. Hammerstein, E., Cenko, S. B., Gezari, S., Veilleux, S., O’Connor, B., et al., 2023. "Integral Field Spectroscopy of 13 Tidal Disruption Event Hosts from the ZTF Survey". ApJ, 957, 86.

  31. Hall, X., Busmann, M., Hauke, K., Kunnumkai, K., Palmese, A., O’Connor, B., et al., 2026. "AT2025ulz and S250818k: Investigating early time observations of a subsolar mass gravitational-wave binary neutron star merger candidate". Submitted. doi:10.48850/arXiv.2510.24620

  32. Ricci, R., Troja, E., Bruni, G., Matsumoto, T., Piro, L., O’Connor, B., et al., 2021. "Searching for the radio remnants of short-duration gamma-ray bursts". MNRAS, 500, 1708.

  33. Enoto, T., Ng, M., Hu, C.-P., Güver, T., Jaisawal, G. K., O’Connor, B., et al., 2021. "A Month of Monitoring the New Magnetar Swift J1555.2−5402 during an X-Ray Outburst". ApJL, 920, L4.

  34. Sears, H., Somalwar, J., Chornock, R., Lasker, T., Levan, A., Margutti, R., O’Connor, B., et al., 2026. "Late-time JWST/NIRCam Observations of the Extremely Long-duration GRB 250702B/EP 250702a and Its Host Galaxy". Submitted.

  35. Yang, Y.-H., Ricci, R., Troja, E., Yadav, M., Yin, Y.-H., Sanchez-Ramirez, R., O’Connor, B., et al., 2026. "An extremely bright slow-rising afterglow from an off-axis jet in GRB 260310A". Submitted.

  36. Srinivasaragavan, G. P., Li, D., Hall, X. J., Gottlieb, O., Schroeder, G., Liu, H., O’Connor, B., et al., 2026. "EP250827b/SN 2025wkm: An X-ray Flash-Supernova Powered by a Central Engine and Circumstellar Interaction". ApJL, 1006, L36.

  37. Hammerstein, E., Cenko, S. B., Andreoni, I., Charalampopoulos, P., Chornock, R., Margutti, R., O’Connor, B., et al., 2026. "The Jetted Tidal Disruption Event AT2022cmc: Investigating Connections to the Optical Tidal Disruption Event Population and Spectral Subclasses Through Late-Time Follow-up". ApJ, 996, 143.

  38. Goldberg, J., O’Grady, A. J. G., Joyce, M., Johnson, C., Molnár, L., Dupree, A., O’Connor, B., et al., 2025. "Betelgeuse, Betelgeuse, Betelgeuse, Betel-buddy? Constraints on the dynamical companion to α Orionis from HST". ApJ, 994, 101.

  39. Yadav, M., Troja, E., Ricci, R., Yang, Y.-H., Veres, P., Wieringa, M. H., O’Connor, B., et al., 2025. "Radio observations point to a moderately relativistic outflow in the fast X-ray transient EP241021a". ApJ, 995, 216.

  40. Troja, E., van Eerten, H., Zhang, B., Ryan, G., Piro, L., Ricci, R., O’Connor, B., et al., 2020. "A thousand days after the merger: Continued X-ray emission from GW170817". MNRAS, 498, 5643.

  41. Kocevski, D., Burns, E., Barclay, T., White, N. E., Galeazzi, M., O’Connor, B., et al., 2026. "A Proliferated Space Architecture for Time-Domain Astrophysics". Submitted. doi:10.48550/arXiv.2609.12153

  42. Schroeder, G., Ho, A. Y. Q., Lamb, G. P., Laskar, T., Perley, D. A., et al., 2026. "X-ray Through Radio Observations and Modeling of the Soft X-ray Flash GRB 250419A". Submitted to ApJ. doi:10.48550/arXiv.2610.00508

  43. Kocevski, D., Margutti, R., Coughlin, M., Fryer, C., Alexander, K., et al., 2026. "4th TDAMM Workshop White Paper". doi:10.48550/arXiv.2607.22404

  44. White, N. E., Galeazzi, M., Kocevski, D., Grove, J. E., Guiriec, S., van der Horst, A. J., 2026. "XTRA: the X-ray transient array". Proc. SPIE, 14146, 141460J. doi:10.1117/12.3103840

  45. Hall, X., Ahumada, T., Gassert, J., Palmese, A., Metzger, B. D., Kasliwal, M., et al., 2026. "Electromagnetic Follow-up of the Sub-Solar Mass Gravitational Wave Candidate S251112cm: Kilonova Constraints and a Coincident IIb Supernova". Submitted to ApJ. doi:10.48550/arXiv.2605.10940

  46. Lemon, C., Goobar, A., Johansson, J., Mortsell, E., Schulze, S., Andreoni, I., Bochenek, A., et al., 2026. "A Natural >100× Telescope: Discovery of the Strongly Lensed Type II SN 2025mkn at z = 1.37". ApJL, 1003, L47.

  47. Hu, L., Cabrera, T., Palmese, A., Wang, L., Andreoni, I., et al., 2026. "A GPU-Accelerated Transient Detection Pipeline for DECam Time-Domain Surveys". PASP, 138, 074503.

  48. Stein, R., Carney, J., Ward, C., Margutti, R., Hall, X. J., et al., 2026. "TDE 2025abcr: A Tidal Disruption Event in the Outskirts of a Massive Galaxy". ApJL, 1006, L57.

  49. Li, A., Wang, C., Passaleva, N., An, J., Zhang, B.-B., et al., 2026. "Minutes-long soft X-ray prompt emission from a compact object merger". Science Bulletin, Volume 71, Issue 18.

  50. Yang, Y.-H., Troja, E., Ristic, M., Yadav, M., El Kabir, M., et al., 2026. "AT2025ulz and S250818k: Zooming in with the Hubble Space Telescope". ApJL, 996, L24.

  51. Becerra, R., Yang, Y.-H., Troja, E., El Kabir, M., Dichiara, S., et al., 2026. "Exploring the connection between compact object mergers and fast X-ray transients: the cases of LXT 240402A & EP250207b". A&A, 705, A233.

  52. Kasliwal, M., Ahumada, T., Stein, R., Karambelkar, V., Hall, X., et al., 2025. "ZTF25abjmnps (AT2025ulz) and S250818k: A Candidate Superkilonova from a Sub-threshold Sub-Solar Gravitational Wave Trigger". ApJL, 995, L59.

  53. Angulo-Valdez, C., Becerra, R., Gill, R., Globus, N., Lee, W., et al., 2026. "Evidence of Energy Injection in the Short and Distant GRB 250221A". MNRAS, 546, stag184.

  54. Swain, V., Ahumada, T., Patil, S., Wagh, Y., Bhalerao, V., et al., 2026. "GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau". ApJL, 996, L38.

  55. Stein, R., Ho, A., Gangopadhyay, A., Ahumada, T., Kasliwal, M., et al., 2025. "SN 2023uqf: An Interacting Supernova Coincident with a High-Energy Neutrino". Submitted. doi:10.48550/arXiv.2508.08355

  56. Hu, L., Cabrera, T., Palmese, A., Freeburn, J., Bulla, M., Andreoni, I., Hall, X. J., et al., 2025. "Kilonova constraints for the LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: GW-MMADS observations". ApJL, 990, L46. doi:10.3847/2041-8213/adfd49

  57. Ahumada, T., Anand, S., Bulla, M., Gupta, V., Kasliwal, M., Stein, R., Karambelkar, V., et al., 2026. "LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: Zwicky Transient Facility observations". PASP, 138, 034101. doi:10.1088/1538-3873/ae4539

  58. Srinivasaragavan, G., Hamidani, H., Schroeder, G., Sarin, N., Ho, A., Piro, A., et al., 2025. "EP250108a/SN 2025kg: A Jet-driven Stellar Explosion Interacting with Circumstellar Material". ApJL, 988, L60.

  59. Pillas, M., Antier, S., Ackley, K., Ahumada, T., et al., 2025. "Limits on the Ejecta Mass During the Search for Kilonovae Associated with Neutron Star-Black Hole Mergers: A case study of S230518h, GW230529, S230627c and the Low-Significance Candidate S240422ed". PhRvD, 112, 083002. doi:10.1103/6ld6-95xh

  60. Callow, J., Graur, O., Clark, P., et al., 2025. "The rate of extreme coronal line emitters in the Baryon Oscillation Spectroscopic Survey LOWZ sample". MNRAS, 539, 231.

  61. Kunnumkai, K., Palmese, A., Farah, A., et al., 2024. "Detecting electromagnetic counterparts to LIGO/Virgo/KAGRA gravitational wave events with DECam: Neutron Star Mergers". ApJ, 993, 15.

  62. Trigg, A., Stewart, R., van Kooten, A., Burns, E., Roberts, O., et al., 2024. "Extragalactic Magnetar Giant Flare GRB 231115A: Insights from Fermi/GBM Observations". A&A, 694, A323.

  63. Yao, Y., Guolo, M., Tombesi, F., Li, R., Gezari, S., et al., 2024. "Sub-relativistic Outflow and Hours-Timescale Large-amplitude X-ray Dips during Super-Eddington Accretion onto a Low-mass Massive Black Hole in the Tidal Disruption Event AT2022lri". ApJ, 976, 34.

  64. Das, K., Fremling, C., Kasliwal, M., Schulze, S., Sollerman, J., Karambelkar, V., et al., 2024. "SN 2023zaw: an ultra-stripped, nickel-poor supernova from a low-mass progenitor". ApJ, 969, L11.

  65. Bruni, G., Piro, L., Yang, Y.-P., Quai, S., Zhang, B., et al., 2024. "A nebular origin for the persistent radio emission of fast radio bursts". Nature, 632, 1014. doi:10.1038/s41586-024-07782-6

  66. Ghosh, R., Laha, S., Meyer, E., et al., 2023. "A re-emerging bright soft-X-ray state of the changing-look Active Galactic Nucleus 1ES 1927+654: a multi-wavelength view". ApJ, 955, 3.

  67. Dichiara, S., Troja, E., Lipunov, V., Ricci, R., et al., 2022. "The early afterglow of GRB 190829A". MNRAS, 512, 2337.

  68. Dichiara, S., Becerra, R. L., Chase, E. A., Troja, E., et al., 2021. "Constraints on the Electromagnetic Counterpart of the Neutron-star-Black-hole Merger GW200115". ApJL, 923, L32.

  69. Gorgone, N. M., Woudt, P. A., Buckley, D., Mukai, K., et al., 2021. "Swift/XRT Deep Galactic Plane Survey Discovery of a New Intermediate Polar Cataclysmic Variable, Swift J183920.1−045350". ApJ, 923, 243.

  70. Champion, D., Cognard, I., Cruces, M., Desvignes, G., et al., 2020. "High-cadence observations and variable spin behaviour of magnetar Swift J1818.0−1607 after its outburst". MNRAS, 498, 6044.

Brendan M. O'Connor

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