GCN Circular 33341

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.

Links:
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[1] http://astrosat.iucaa.in/czti/?q=grb