GRB 230216B

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

Y. Akaike  (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), S. Torii, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:

The long GRB 230216B (AstroSat CZTI detection: Shetty et al.,
GCN Circ. 33341
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 ) triggered the CALET Gamma-ray Burst Monitor
(CGBM) at 19:03:22.03 UTC on 16 February 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1360609287/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a multi-peaked structure that starts
at T+1.5 sec, peaks at T+4.9 sec, and ends at T+11.1 sec.
The T90 and T50 durations measured by the SGM data are 8.3 +/- 1.1 sec
and 3.1 +/- 0.4 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1360609287/

The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.