GRB 230204B: GIT Discovery of a Fast Fading Afterglow Associated with an Energetic GRB from a Massive-Star Progenitor
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910037526446080 |
|---|---|
| author | Swain, Vishwajeet Bhalerao, Varun Kumar, Harsh Goyal, Mehul Ghosh, Ankur Pathak, Utkarsh Chandra, Poonam Ahumada, Tomas Anupama, G. C. Bala, Suman Barway, Sudhanshu Bloom, Joshua S. Dimple, Dimple Karambelkar, Viraj R. Kasliwal, Mansi M. Misra, Kuntal Purdum, Josiah Saraogi, Divita Sollerman, Jesper Suresh, Aswin van der Walt, Stefan J. Waratkar, Gaurav |
| author_facet | Swain, Vishwajeet Bhalerao, Varun Kumar, Harsh Goyal, Mehul Ghosh, Ankur Pathak, Utkarsh Chandra, Poonam Ahumada, Tomas Anupama, G. C. Bala, Suman Barway, Sudhanshu Bloom, Joshua S. Dimple, Dimple Karambelkar, Viraj R. Kasliwal, Mansi M. Misra, Kuntal Purdum, Josiah Saraogi, Divita Sollerman, Jesper Suresh, Aswin van der Walt, Stefan J. Waratkar, Gaurav |
| contents | We present a comprehensive multi-wavelength study of a bright gamma-ray burst GRB 230204B, analyzing both prompt and afterglow emissions. This GRB is highly energetic, with an isotropic equivalent energy emission $E_{\mathrm{iso}} \sim 2.2 \times 10^{54}\ \mathrm{erg}$, released during the prompt emission. The GROWTH-India Telescope discovered a bright afterglow ($m_r = 15.55$) that faded rapidly ($\propto t^{-1.82}$). The prompt emission shows strong thermal photospheric emission, along with a non-thermal high-energy component. We explore the evolution of these components and find them to be consistent with theoretical expectations. Afterglow modeling reveals an energetic jet $E_{tot} \gtrsim 10^{52}\ \mathrm{erg}$ expanding into a wind-type medium viewed nearly on-axis, suggesting a massive star progenitor with strong winds. We also explore correlations between the prompt emission and afterglow that may help to understand the complete picture of GRB progenitors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_03136 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | GRB 230204B: GIT Discovery of a Fast Fading Afterglow Associated with an Energetic GRB from a Massive-Star Progenitor Swain, Vishwajeet Bhalerao, Varun Kumar, Harsh Goyal, Mehul Ghosh, Ankur Pathak, Utkarsh Chandra, Poonam Ahumada, Tomas Anupama, G. C. Bala, Suman Barway, Sudhanshu Bloom, Joshua S. Dimple, Dimple Karambelkar, Viraj R. Kasliwal, Mansi M. Misra, Kuntal Purdum, Josiah Saraogi, Divita Sollerman, Jesper Suresh, Aswin van der Walt, Stefan J. Waratkar, Gaurav High Energy Astrophysical Phenomena We present a comprehensive multi-wavelength study of a bright gamma-ray burst GRB 230204B, analyzing both prompt and afterglow emissions. This GRB is highly energetic, with an isotropic equivalent energy emission $E_{\mathrm{iso}} \sim 2.2 \times 10^{54}\ \mathrm{erg}$, released during the prompt emission. The GROWTH-India Telescope discovered a bright afterglow ($m_r = 15.55$) that faded rapidly ($\propto t^{-1.82}$). The prompt emission shows strong thermal photospheric emission, along with a non-thermal high-energy component. We explore the evolution of these components and find them to be consistent with theoretical expectations. Afterglow modeling reveals an energetic jet $E_{tot} \gtrsim 10^{52}\ \mathrm{erg}$ expanding into a wind-type medium viewed nearly on-axis, suggesting a massive star progenitor with strong winds. We also explore correlations between the prompt emission and afterglow that may help to understand the complete picture of GRB progenitors. |
| title | GRB 230204B: GIT Discovery of a Fast Fading Afterglow Associated with an Energetic GRB from a Massive-Star Progenitor |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.03136 |