GRB 191027A: CALET Gamma-Ray Burst Monitor detection

GRB 191027A (Fermi GBM Final Real-time Localization: Fermi GBM Team, GCN Circ. 26078; BALROG localization: Biltzinger et al., GCN Circ. 26079, 26096; IPN triangulation: Hurley et al., GCN Circ. 26087; Konus-Wind observation: Ridnaia et al., GCN Circ. 26100; https://gcn.gsfc.nasa.gov/other/191027A.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 15:19:06.826 UTC on 27 October 2019. The burst signal was seen by all CGBM detectors. The burst light curve shows a FRED-like pulse which starts at T+0.6 sec, peaks at T+0.9 sec and ends at T+3.0 sec. The T90 and T50 durations measured by the SGM data are 1.9 +- 0.6 sec and 0.6 +- 0.3 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1256224690/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.