GCN 45163: GRB 260714B: AstroSat CZTI detection

2026-07-15T07:10:34.515Z | rev 2 | event: GRB 260714B
U. Pathak (IITB), A. Arya (IITB), A. Goyal (IITB), Harsha K. H. (IUCAA), S.Salunke(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 long GRB 260714B which was also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 45161), and Fermi LAT (Gupta et. al. , GCN Circ. 45162).

The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-07-14 18:23:32.56 UTC. The measured peak count rate associated with the burst is 816 (+51, -54) counts/s above the background in the combined data of all quadrants, with a total of 3549 (+51, -54) counts. The local mean background count rate was 244 (+3, -3) counts/s. We measure a T90 of 10.7 (+0.2, -0.2) s from the cumulative CZT light curve. In the preliminary analysis, we find 543 Compton events associated with this event.

The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-07-14 18:23:29.78 UTC. The measured peak count rate associated with the burst is 1428 (+71, -82) counts/s above the background in the combined data of all quadrants, with a total of 6388 (+194, -285) counts. The local mean background count rate was 1225 (+5, -6) counts/s. We measure a T90 of 10.7 (+0.2, -0.2) s from the cumulative Veto light curve.

CZTI data products like interactive and downloadable light curves for this GRB can be found at: 
https://astrosat.iucaa.in/cift/cift_products/ET20260714T182326/ET20260714T182326_details.html

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