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Geoffrey Ryan

Perimeter Institute for Theoretical Physics

22H-index
85Paper Count
2.2KCitation Count
Published Papers 38
Publication Date
Eccentric Binaries Accreting from Thin Disks: Orbital Evolution
err2026-04-10
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errAlexander J. Dittmann; Geoffrey Ryan; Luciano Combi
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Radio Observations Point to a Moderately Relativistic Outflow in the Fast X-Ray Transient EP241021a
err2025-12-18
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errMuskan Yadav; Eleonora Troja; Roberto Ricci; Yu-Han Yang; Mark H. Wieringa; Brendan O’Connor; Yacheng Kang; Rosa L. Becerra; Geoffrey Ryan; Malte Busmann
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AT2025ulz and S250818k: Deep X-Ray and Radio Limits on Off-axis Afterglow Emission and Prospects for Future Discovery
err2025-12-11
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errBrendan O’Connor; Roberto Ricci; Eleonora Troja; Antonella Palmese; Yu-Han Yang; Geoffrey Ryan; Hendrik van Eerten; Muskan Yadav; Xander J. Hall; Ariel Amsellem; R. L. Becerra; Malte Busmann; Tomás Cabrera; Simone Dichiara; Lei Hu; Ravjit Kaur; Keerthi Kunnumkai; Ignacio Magaña Hernandez
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The Nature of Optical Afterglows without Gamma-Ray Bursts: Identification of AT2023lcr and Multiwavelength Modeling
err2025-05-19
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errLi, Maggie L.; Ho, Anna Y. Q.; Ryan, Geoffrey; Perley, Daniel A.; Lamb, Gavin P.; Nayana, A. J.; Andreoni, Igor; Anupama, G. C.; Bellm, Eric C.; Berger, Edo; Bloom, Joshua S.; Burns, Eric; Caiazzo, Ilaria; Chandra, Poonam; Coughlin, Michael W.; El-Badry, Kareem; Graham, Matthew J.; Kasliwal, Mansi; Keating, Garrett K.; Kulkarni, S. R.; Kumar, Harsh; Masci, Frank J.; Perley, Richard A.; Purdum, Josiah; Rao, Ramprasad; Rodriguez, Antonio C.; Rusholme, Ben; Sarin, Nikhil; Sollerman, Jesper; Srinivasaragavan, Gokul P.; Swain, Vishwajeet; Vanderbosch, Zachary
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Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet
err2025-02-18
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errSrinivasaragavan, Gokul P.; Perley, Daniel A.; Ho, Anna Y. Q.; O'Connor, Brendan; Postigo, Antonio de Ugarte; Sarin, Nikhil; Cenko, S. Bradley; Sollerman, Jesper; Rhodes, Lauren; Green, David A.; Svinkin, Dmitry S.; Bhalerao, Varun; Waratkar, Gaurav; Nayana, A. J.; Chandra, Poonam; Miller, M. Coleman; Malesani, Daniele B.; Ryan, Geoffrey; Srijan, Suryansh; Bellm, Eric C.; Burns, Eric; Titterington, David J.; Stone, Maria B.; Purdum, Josiah; Ahumada, Tomas; Anupama, G. C.; Barway, Sudhanshu; Coughlin, Michael W.; Drake, Andrew; Fender, Rob; Fernandez, Jose F. Aguei; Frederiks, Dmitry D.; Geier, Stefan; Graham, Matthew J.; Kasliwal, Mansi M.; Kulkarni, S. R.; Kumar, Harsh; Li, Maggie L.; Laher, Russ R.; Lysenko, Alexandra L.; Parwani, Gopal; Perley, Richard A.; Ridnaia, Anna, V; Salgundi, Anirudh; Smith, Roger; Sravan, Niharika; Swain, Vishwajeet; Thoene, Christina C.; Tsvetkova, Anastasia E.; Ulanov, Mikhail, V; Vail, Jada; Wise, Jacob L.; Wold, Avery
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GRB 220831A: a hostless, intermediate gamma-ray burst with an unusual optical afterglow
err2025-01-27
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errFreeburn, James; O'Connor, Brendan; Cooke, Jeff; Dobie, Dougal; Moeller, Anais; Tejos, Nicolas; Zhang, Jielai; Beniamini, Paz; Auchettl, Katie; Delaunay, James; Dichiara, Simone; Fong, Wen-fai; Goode, Simon; Gordon, Alexa; Kilpatrick, Charles D.; Lien, Amy; Mihalenko, Cassidy; Ryan, Geoffrey; Siellez, Karelle; Suhr, Mark; Troja, Eleonora; Van Bemmel, Natasha; Webb, Sara
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Modeling of Long-term Afterglow Counterparts to Gravitational Wave Events: The Full View of GRB 170817A
err2024-10-29
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errRyan, Geoffrey; van Eerten, Hendrik; Troja, Eleonora; Piro, Luigi; O'Connor, Brendan; Ricci, Roberto
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The Santa Barbara Binary-disk Code Comparison
err2024-07-29
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errDuffell, Paul C.; Dittmann, Alexander J.; D'Orazio, Daniel J.; Franchini, Alessia; Kratter, Kaitlin M.; Penzlin, Anna B. T.; Ragusa, Enrico; Siwek, Magdalena; Tiede, Christopher; Wang, Haiyang; Zrake, Jonathan; Dempsey, Adam M.; Haiman, Zoltan; Lupi, Alessandro; Pirog, Michal; Ryan, Geoffrey
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Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses
err2024-01-18
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errGianfagna, Giulia; Piro, Luigi; Pannarale, Francesco; Van Eerten, Hendrik; Ricci, Fulvio; Ryan, Geoffrey
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Evidence for a luminosity-decay correlation in GRB GeV light curves
err2023-09-22
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errHinds, K. R.; Oates, S. R.; Nicholl, M.; Patel, J.; Omodei, N.; Gompertz, B.; Racusin, J. L.; Ryan, G.
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A structured jet explains the extreme GRB 221009A
err2023-06-09
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errO'Connor, Brendan; Troja, Eleonora; Ryan, Geoffrey; Beniamini, Paz; van Eerten, Hendrik; Granot, Jonathan; Dichiara, Simone; Ricci, Roberto; Lipunov, Vladimir; Gillanders, James H.; Gill, Ramandeep; Moss, Michael; Anand, Shreya; Andreoni, Igor; Becerra, Rosa L.; Buckley, David A. H.; Butler, Nathaniel R.; Cenko, Stephen B.; Chasovnikov, Aristarkh; Durbak, Joseph; Francile, Carlos; Hammerstein, Erica; van der Horst, Alexander J.; Ksilwal, Mansi M.; Kouveliotou, Chryssa; Kutyrev, Alexander S.; Lee, William H.; Srinivasaragavan, Gokul P.; Topolev, Vladislav; Watson, Alan M.; Yang, Yuhan; Zhirkov, Kirill
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Joint analysis of gravitational-wave and electromagnetic data of mergers: breaking an afterglow model degeneracy in GW170817 and in future events
err2023-06-08
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errGianfagna, Giulia; Piro, Luigi; Pannarale, Francesco; Van Eerten, Hendrik; Ricci, Fulvio; Ryan, Geoffrey; Troja, Eleonora
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The Decoupling of Binaries from Their Circumbinary Disks
err2023-06-01
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errDittmann, Alexander J.; Ryan, Geoffrey; Miller, M. Coleman
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Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs (vol 911, 28, 2021)
err2022-07-26
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errDichiara, S.; Troja, E.; Beniamini, P.; O'Connor, B.; Moss, M.; Lien, A. Y.; Ricci, R.; Amati, L.; Ryan, G.; Sakamoto, T.
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Resonant shattering flares in black hole-neutron star and binary neutron star mergers
err2022-06-17
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errNeill, Duncan; Tsang, David; van Eerten, Hendrik; Ryan, Geoffrey; Newton, William G.
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The early afterglow of GRB 190829A
err2022-02-18
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errDichiara, S.; Troja, E.; Lipunov, V; Ricci, R.; Oates, S. R.; Butler, N. R.; Liuzzo, E.; Ryan, G.; O'Connor, B.; Cenko, S. B.; Cosentino, R. G.; Lien, A. Y.; Gorbovskoy, E.; Tyurina, N.; Balanutsa, P.; Vlasenko, D.; Gorbunov, I; Podesta, R.; Podesta, F.; Rebolo, R.; Serra, M.; Buckley, D. A. H.
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