Time Evolution of Optical Darkness in GRB Afterglow: The Case of GRB 240825A
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909995143004160 |
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| author | Li, Rui-Zhi Mao, Jirong Yang, Yuan-Pei Wang, Bo-Ting Song, Fei-Fan Xin, Yu-Xin Bai, Jin-Ming |
| author_facet | Li, Rui-Zhi Mao, Jirong Yang, Yuan-Pei Wang, Bo-Ting Song, Fei-Fan Xin, Yu-Xin Bai, Jin-Ming |
| contents | Long-duration gamma-ray bursts (GRBs) are believed to occur in star-forming regions. The multiwavelength follow-up observations of the early afterglow of GRB 240825A provided insights into the evolution of the optical-to-X-ray spectral feature of the afterglow. We comprehensively investigate the evolution of X-ray spectral properties through time-resolved spectral analysis and calculate optical darkness ($β_\mathrm{OX}$) to reveal the physical properties of the afterglow. The X-ray-to-optical SEDs of afterglow in different time intervals are fitted to derive the extinction curves. The $β_\mathrm{OX}$ exhibits a trend of decreasing and then increasing, reaching its minimum value at $\sim1000\mathrm{\,s}$ post-trigger. However, at 11 hours post-trigger, $β_\mathrm{OX}$ does not meet the criteria for an optically dark burst. The extinction curves in different time intervals indicate that GRB 240825A occurred in a dust-obscured environment. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_15162 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Time Evolution of Optical Darkness in GRB Afterglow: The Case of GRB 240825A Li, Rui-Zhi Mao, Jirong Yang, Yuan-Pei Wang, Bo-Ting Song, Fei-Fan Xin, Yu-Xin Bai, Jin-Ming High Energy Astrophysical Phenomena Astrophysics of Galaxies Long-duration gamma-ray bursts (GRBs) are believed to occur in star-forming regions. The multiwavelength follow-up observations of the early afterglow of GRB 240825A provided insights into the evolution of the optical-to-X-ray spectral feature of the afterglow. We comprehensively investigate the evolution of X-ray spectral properties through time-resolved spectral analysis and calculate optical darkness ($β_\mathrm{OX}$) to reveal the physical properties of the afterglow. The X-ray-to-optical SEDs of afterglow in different time intervals are fitted to derive the extinction curves. The $β_\mathrm{OX}$ exhibits a trend of decreasing and then increasing, reaching its minimum value at $\sim1000\mathrm{\,s}$ post-trigger. However, at 11 hours post-trigger, $β_\mathrm{OX}$ does not meet the criteria for an optically dark burst. The extinction curves in different time intervals indicate that GRB 240825A occurred in a dust-obscured environment. |
| title | Time Evolution of Optical Darkness in GRB Afterglow: The Case of GRB 240825A |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.15162 |