TITLE:   GCN CIRCULAR
NUMBER:  43453
SUBJECT: GRB 260115A: AstroSat CZTI detection
DATE:    26/01/19 16:33:28 GMT
FROM:    Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>

A. Arya (IITB), A. Goyal (IITB), M. Tembhurnikar (IUCAA), S. Salunke (IUCAA), Harsha K. H. (IUCAA), 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 GRB 260115A which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 43417), and GECAM-B (Zhang et. al., GCN Circ. 43434).

The source was weakly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-01-15 17:46:47.72 UTC. The measured peak count rate associated with the burst is 252 (+64, -69) counts/s above the background in the combined data of all quadrants, with a total of 270 (+117, -120) counts. The local mean background count rate was 1327 (+9, -12) counts/s.  Due to the low count rate of the burst, we cannot reliably measure T90 for this event.

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