GRB 230204B: CALET Gamma-Ray Burst Monitor detection
Abstract
The long GRB 230204B (MAXI/GSC Detection: Serino et al., GCN Circ. 33265; Swift/BAT-GUANO detection: Kennea et al., GCN Circ. 33267; AstroSat CZTI detection: Waratkar et al., GCN Circ. 33268; AGILE detection: Casentini et al., GCN Circ. 33272; Detection by GRBAlpha: Dafcikova et al., GCN Circ. 33273; Fermi-GBM Detection: Poolakkil et al., GCN Circ. 33288) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 21:44:25.20 UTC on February 4, 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1359582171/index.html). The burst signal was seen by only the SGM detector. The burst light curve shows a double-peaked structure that starts at T+2.3 sec, peaks at T+54.1 sec and ends at T+65.0 sec. The T90 and T50 durations measured by the SGM data are 59.5 +/- 0.9 sec and 11.6 +/- 0.8 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1359582171/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2023
- Bibcode:
- 2023GCN.33322....1A