TITLE: GCN CIRCULAR NUMBER: 37107 SUBJECT: GRB 240807B: AstroSat CZTI detection of a short burst DATE: 24/08/08 21:14:18 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in> A. Dasgupta (BITS Pilani, Hyderabad), G. Waratkar (IITB), J. Joshi (IUCAA), 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 short-duration GRB 240807B which was also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 37101) and INTEGRAL/SPI-ACS (Trigger 10842). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-08-07 22:04:13.6 UTC. The measured peak count rate, as measured with 32 ms binning, is 431 (+266, -105) counts/s above the background in the combined data of three quadrants (out of four), with a total of 45 (+23, -24) counts. The local mean background count rate was 240 (+15, -22) counts/s. Using cumulative rates, we measure a T90 of 0.15 (+0.08, -0.09) s. 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: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/37107. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...