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