TITLE: GCN CIRCULAR NUMBER: 44569 SUBJECT: GRB 260510A: AstroSat CZTI detection DATE: 26/05/12 05:10:46 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com> M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (IUCAA), A. Arya (IITB), A. Goyal (IITB), G. Waratkar (Caltech/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 260510A which is also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 44508), and GECAM-B (Luo et al., GCN Circ. 44519). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2026-05-10 02:51:20.28 UTC. The measured peak count rate associated with the burst is 98 (+27, -16) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1136 (+230, -210) counts. The local mean background count rate was 180 (+2, -2) counts/s. We measure a T90 of 30 (+5, -8) s from the cumulative CZT light curve. The source was also faintly 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 data products like interactive and downloadable light curves for this GRB can be found at: https://astrosat.iucaa.in/cift/cift_products/516077480.79/S516077480.79_deta... CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/44569. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...