//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33341 SUBJECT: GRB 230216B: AstroSat CZTI detection DATE: 23/02/18 06:55:51 GMT FROM: Gaurav Waratkar at IIT,Bombay P. Shetty (IITB), P K. Navaneeth (IUCAA), G. Waratkar (IITB), M. Dixit (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 230216B which was also detected by CALET-GBM (GCN Notice. 1360609287). The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-02-16 19:03:30 UTC. The measured peak count rate associated with the burst is 319.5 (+96.6 -57.1) counts/s above the background in the combined data of all four quadrants, with a total of 634 (+222 -225) counts. The local mean background count rate was 405.3 (+3.9 -5.0) counts/s. Using cumulative rates, we measure a T90 of 5.85 (+3.85 -2.20) s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. Links: ------ [1] http://astrosat.iucaa.in/czti/?q=grb //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33359 SUBJECT: GRB 230216B: CALET Gamma-Ray Burst Monitor detection DATE: 23/02/21 04:32:39 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 230216B (AstroSat CZTI detection: Shetty et al., GCN Circ. 33341) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 19:03:22.03 UTC on 16 February 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1360609287/index.html). The burst signal was seen by all CGBM detectors. The burst light curve shows a multi-peaked structure that starts at T+1.5 sec, peaks at T+4.9 sec, and ends at T+11.1 sec. The T90 and T50 durations measured by the SGM data are 8.3 +/- 1.1 sec and 3.1 +/- 0.4 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1360609287/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University. ---- Yuta Kawakubo Postdoctoral Researcher Department of Physics & Astronomy Louisiana State University 343C Nicholson Hall, Tower Drive Baton Rouge, LA 70803 kawakubo1@lsu.edu