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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., 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

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

  10. 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

  11. 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

  12. 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

  13. 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. 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

  2. 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. doi:10.48550/arXiv.2503.14588

  3. Freeburn, J., O’Connor, B., Cooke, J., Dobie, D., et al., 2024. "GRB 220831A: a hostless, intermediate Gamma-ray burst with an unusual optical afterglow". MNRAS, 537, 2061.  doi:10.48550/arXiv:2411.14749

  4. Kaur, R., O’Connor, B., Palmese, A., Kunnumkai, K. 2024. "Detecting prompt and afterglow jet emission of gravitational wave events from LIGO/Virgo/KAGRA and next generation detectors". Submitted. doi: 10.48550/arXiv.2410.10579

  5. 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.

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

  7. 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.

  8. 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.

  9. Hall, X., Palmese, A.,O'Connor, B., Gruen, D., et al., 2025. "AT2025ulz and S250818k: DESI spectroscopy and the hunt for a kilonova associated with a sub-solar mass gravitational wave candidate". Submitted to ApJL.

  10. Dichiara, S., Troja, E., O'Connor, B., Yang, Y.-H., et al., 2025. "A merger within a merger: Chandra pinpoints the short GRB 230906A in a peculiar environment". Submitted to ApJL.

  11. 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.

  12. 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.

  13. 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".

  14. Troja, E., Fryer, C. L., O'Connor, B., Ryan, G., et al., 2022. "A long gamma-ray burst from a stellar merger in the nearby Universe". Nature, 612, 228–231. Link

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

  16. Hall, X., Busmann, M., Palmese, A., Hauke, K., O'Connor, B., et al., 2025. "AT2025ulz and S250818k: Investigating early time observations of a subsolar mass gravitational-wave binary neutron star merger candidate". Submitted to ApJL.

  17. 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

  18. 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

  19. 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.

  20. 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.

  21. Becerra, R. L., Troja, E., Watson, A., O’Connor, B., et al., 2022. "Deciphering the unusual stellar progenitor of GRB 210704". MNRAS, 522, 5204.

  22. Granot, J., Perets, H., Gill, R., Beniamini, P., O’Connor, B., 2025. "A milli-Tidal Disruption Event Model for GRB 250702B: Main Sequence Star Disrupted by an IMBH". Submitted to MNRAS. doi:10.48550/ arXiv:2512.14847

  23. 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.

  24. 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".

  25. 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".

  26. 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.

  27. Enoto, T., Ng, M., Hu, C.-P., Guver, 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.

  28. Srinivasaragavan, G.~P., Li, D., Hall, X.~J., Gottlieb, O., Schroeder, G., Liu, H., O'Connor, B., et al., 2025."EP250827b/SN 2025wkm: An X-ray Flash-Supernova Powered by a Central Engine and Circumstellar Interaction". Submitted. doi:10.48550/arXiv:2512.10239

  29. Hammerstein, E., Cenko, S. B., Andreoni, I., Charalampopoulos, P., Chornock, R., Margutti, R., O'Connor, B., et al., 2025. "The Jetted Tidal Disruption Event AT2022cmc: Investigating Connections to the Optical Tidal Disruption Event Population and Spectral Subclasses Through Late-Time Follow-up". Submitted. doi:10.48550/ arXiv:2506.08250

  30. 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, 992, 107.

  31. 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". Submitted. doi:10.48550/arXiv:2505.08781

  32. 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.

  33.  Becerra, R., Yang, Y.-H., Troja, E., El Kabir, M., Dichiara, S., et al., 2025. "Exploring the connection between compact object mergers and fast X-ray transients: the cases of LXT 240402A & EP250207b". Submitted to A&A.

  34. 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.

  35. Angulo-Valdez, C., Becerra, R., Gill, R., Globus, N., Lee, W., et al., 2025. "Evidence of Energy Injection in the Short and Distant GRB 250221A". Submitted to MNRAS.

  36.  Swain, V., Ahumada, T., Patil, S., Wagh, Y., Bhalerao, V., et al., 2025. "GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau". Submitted to ApJL. doi:10.48550/arXiv.2509.02769

  37. 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

  38. 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

  39. Ahumada T., Anand S., Bulla M., Gupta V., Kasliwal M., Stein R., Karambelkar V., et al., 2025. "LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: Zwicky Transient Facility observations". Submitted. doi:10.48550/arXiv:2507.00357

  40. 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.

  41. 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

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

  43. 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.

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

  45. Y. Yao, M. Guolo, F. Tombesi, R. Li, S. Gezari, 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.

  46. 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.

  47.  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. https://doi.org/10.1038/s41586-024-07782-6

  48. 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".

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

  50. 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.

  51. 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.

  52. 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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