Bridging the Gap: GRB 230812B -- A Three-Second Supernova-Associated Burst Detected by the GRID Mission
Abstract
GRB 230812B, detected by the Gamma-Ray Integrated Detectors (GRID) constellation mission, is an exceptionally bright gamma-ray burst (GRB) with a duration of only 3 seconds. Sitting near the traditional boundary ( 2 s) between long and short GRBs, GRB 230812B is notably associated with a supernova (SN), indicating a massive star progenitor. This makes it a rare example of a short-duration GRB resulting from stellar collapse. Our analysis, using a time-evolving synchrotron model, suggests that the burst has an emission radius of approximately ~cm. We propose that the short duration of GRB 230812B is due to the combined effects of the central engine's activity time and the time required for the jet to break through the stellar envelope. Our findings provide another case that challenges the conventional view that short-duration GRBs originate exclusively from compact object mergers, demonstrating that a broader range of durations exists for GRBs arising from the collapse of massive stars.
Keywords
Cite
@article{arxiv.2409.12613,
title = {Bridging the Gap: GRB 230812B -- A Three-Second Supernova-Associated Burst Detected by the GRID Mission},
author = {Chen-Yu Wang and Yi-Han Iris Yin and Bin-Bin Zhang and Hua Feng and Ming Zeng and Shao-Lin Xiong and Xiao-Fan Pan and Jun Yang and Yan-Qiu Zhang and Chen Li and Zhen-Yu Yan and Chen-Wei Wang and Xu-Tao Zheng and Jia-Cong Liu and Qi-Dong Wang and Zi-Rui Yang and Long-Hao Li and Qi-Ze Liu and Zheng-Yang Zhao and Bo Hu and Yi-Qi Liu and Si-Yuan Lu and Zi-You Luo and Ji-Rong Cang and De-Zhi Cao and Wen-Tao Han and Li-Ping Jia and Xing-Yu Pan and Yang Tian and Ben-Da Xu and Xiao Yang and Zhi Zeng},
journal= {arXiv preprint arXiv:2409.12613},
year = {2024}
}
Comments
10 pages, 3 tables, 11 figures