Soft Gamma-ray Behavior of the Giant Magnetar Flare GRB 200415A
Abstract
With the detection of GW170817/GRB170817A, binary neutron star mergers were confirmed to be a progenitor system of short gamma-ray bursts (SGRBs). However, the SGRB distribution shows some outliers with short duration, low isotropic energy, and atypical spectral parameters, indicating the possibility of another progenitor system. Using triangulation the IPN localized GRB200415A to the starburst galaxy NGC 253. The Eiso for this GRB was comparable to SGR1806-20's superflare, suggesting the burst was a giant flare from a magnetar. Though no gravitational wave (GW) signals were detected from GRB200415A, such events are potentially GW sources for future higher sensitivity instruments. We present soft gamma-ray INTEGRAL/IBIS/PICsIT results exploring the temporal and spectral evolution of GRB200415A in the ~200-2600 keV energy range and discuss the prospects for detecting GW signals for future giant flares from magnetars.
- Publication:
-
44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.1947R