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GCN Circular 33869

GRB 230524B: AstroSat CZTI detection
2023-05-24T13:36:46Z (15 days ago)
Gaurav Waratkar at IIT Bombay <>
P K. Navaneeth (IUCAA), G. Waratkar (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 probable long GRB 230524B which was also detected by Fermi-GBM (Trigger Number 706599831). The source was detected in the 20-200 keV energy range. The light curve peaks at 2023-05-24 05:43:58.50 UTC. The measured peak count rate associated with the burst is 108 (+47, -6) counts/s above the background in the combined data of all quadrants, with a total of 1060 (+469, -248) counts. The local mean background count rate was 409 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of 21 (+12, -8) s. The source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. 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. CZTI GRB detections are reported regularly on the payload site at:
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