GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914027035164672 |
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| author | Swain, Vishwajeet Ahumada, Tomás Patil, Sameer K. Wagh, Yogesh Bhalerao, Varun Nakar, Ehud Kasliwal, Mansi Hall, Xander J. Busmann, Malte Anand, Shreya Karambelkar, Viraj Andreoni, Igor Anupama, G. C. Arya, Anuraag Balasubramanian, Arvind Barway, Sudhanshu Carney, Jonathan Coughlin, Michael Eappachen, Deepak Freeburn, James Gruen, Daniel Mohan, Tanishk O'Connor, Brendan Palmese, Antonella Pathak, Utkarsh Sahu, D. K. Saikia, Aditya Pawan Sarin, Nikhil Srinivasaragavan, Gokul Tanenia, Hitesh |
| author_facet | Swain, Vishwajeet Ahumada, Tomás Patil, Sameer K. Wagh, Yogesh Bhalerao, Varun Nakar, Ehud Kasliwal, Mansi Hall, Xander J. Busmann, Malte Anand, Shreya Karambelkar, Viraj Andreoni, Igor Anupama, G. C. Arya, Anuraag Balasubramanian, Arvind Barway, Sudhanshu Carney, Jonathan Coughlin, Michael Eappachen, Deepak Freeburn, James Gruen, Daniel Mohan, Tanishk O'Connor, Brendan Palmese, Antonella Pathak, Utkarsh Sahu, D. K. Saikia, Aditya Pawan Sarin, Nikhil Srinivasaragavan, Gokul Tanenia, Hitesh |
| contents | We present a detailed multi-wavelength afterglow study of the short GRB 250704B, extensively monitored in optical and near-infrared bands. Its afterglow displays an unusually long-duration plateau followed by an achromatic break and a steep decline, deviating from canonical GRB afterglows. While long plateaus are often explained by central engine activity, we find that for GRB 250704B, an energy injection model requires unreasonable parameters. The afterglow is better explained by an off-axis power-law structured jet with a narrow core ($θ_c \approx 0.7^{\circ}$) viewed at a modest angle ($θ_v \approx 1.9^{\circ}$). A comparison with GRB 170817A shows that both events are consistent with the off-axis structured jet scenario, where the shape of the light curve is governed primarily by the geometry of the jet and the viewing angle rather than the energetics, microphysical parameters, or external density. Our results underscore the importance of incorporating the jet structure in GRB modeling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02769 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau Swain, Vishwajeet Ahumada, Tomás Patil, Sameer K. Wagh, Yogesh Bhalerao, Varun Nakar, Ehud Kasliwal, Mansi Hall, Xander J. Busmann, Malte Anand, Shreya Karambelkar, Viraj Andreoni, Igor Anupama, G. C. Arya, Anuraag Balasubramanian, Arvind Barway, Sudhanshu Carney, Jonathan Coughlin, Michael Eappachen, Deepak Freeburn, James Gruen, Daniel Mohan, Tanishk O'Connor, Brendan Palmese, Antonella Pathak, Utkarsh Sahu, D. K. Saikia, Aditya Pawan Sarin, Nikhil Srinivasaragavan, Gokul Tanenia, Hitesh High Energy Astrophysical Phenomena We present a detailed multi-wavelength afterglow study of the short GRB 250704B, extensively monitored in optical and near-infrared bands. Its afterglow displays an unusually long-duration plateau followed by an achromatic break and a steep decline, deviating from canonical GRB afterglows. While long plateaus are often explained by central engine activity, we find that for GRB 250704B, an energy injection model requires unreasonable parameters. The afterglow is better explained by an off-axis power-law structured jet with a narrow core ($θ_c \approx 0.7^{\circ}$) viewed at a modest angle ($θ_v \approx 1.9^{\circ}$). A comparison with GRB 170817A shows that both events are consistent with the off-axis structured jet scenario, where the shape of the light curve is governed primarily by the geometry of the jet and the viewing angle rather than the energetics, microphysical parameters, or external density. Our results underscore the importance of incorporating the jet structure in GRB modeling. |
| title | GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.02769 |