GRB 230307A is an extremely bright long duration GRB with an observed gamma-ray fluence of ≳3×10−3 erg cm−2 (10-1000 keV), second only to GRB 221009A. Despite its long duration, it is possibly associated with a kilonova, thus resembling the case of GRB 211211A. In analogy with GRB 211211A, we distinguish three phases in the prompt gamma-ray emission of GRB 230307A: an initial short duration, spectrally soft emission; a main long duration, spectrally hard burst; a temporally extended and spectrally soft tail. We intepret the initial soft pulse as a bright precursor to the main burst and compare its properties with models of precursors from compact binary mergers. We find that to explain the brightness of GRB 230307A, a magnetar-like (≳1015 G) magnetic field should be retained by the progenitor neutron star. Alternatively, in the post-merger scenario, the luminous precursor could point to the formation of a rapidly rotating massive neutron star.
@article{arxiv.2307.02996,
title = {A luminous precursor in the extremely bright GRB 230307A},
author = {S. Dichiara and D. Tsang and E. Troja and D. Neill and J. P. Norris and Y. H. Yang},
journal= {arXiv preprint arXiv:2307.02996},
year = {2023}
}
Comments
9 pages, 5 figures, 2 tables. Accepted for publication in ApJ Letters