GRB 191031D: CALET Gamma-Ray Burst Monitor detection
Abstract
The short bright GRB 191031D (Swift detection: Ambrosi et al., GCN Circ. 26112, Sakamoto et al., GCN Circ. 26133; Fermi GBM detection: Mailyan and Meegan, GCN Circ. 26118; AGILE/MCAL observations: Ursi et al., GCN Circ. 26123; Konus-Wind observation: Frederiks et al., GCN Circ. 26126, 26149; AstroSat CZTI detection: Gaikwad et al., GCN Circ. 26129; https://gcn.gsfc.nasa.gov/other/191031D.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 21:23:31.261 UTC on 31 October 2019. The burst signal was seen by all CGBM detectors. No real-time CGBM GCN notice was distributed about this trigger because the real-time communication from the ISS was off (loss of signal). The burst light curve shows a multi-peak structure which starts at T-0.168 sec, peaks at 0.008 sec and ends at T+0.192 sec. The T90 and T50 durations measured by the SGM data are 0.240 +- 0.079 sec and 0.104 +- 0.008 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1256592147/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- November 2019
- Bibcode:
- 2019GCN.26240....1S