P. Shetty (IITB), P K. Navaneeth (IUCAA), G. Waratkar (IITB), M. Dixit
(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 230216B which was
also detected by CALET-GBM (GCN Notice. 1360609287).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2023-02-16 19:03:30 UTC. The measured peak count
rate associated with the burst is 319.5 (+96.6 -57.1) counts/s above the
background in the combined data of all four quadrants, with a total of
634 (+222 -225) counts. The local mean background count rate was 405.3
(+3.9 -5.0) counts/s. Using cumulative rates, we measure a T90 of 5.85
(+3.85 -2.20) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb. 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.