GCN Circular 33530
Subject
GRB 230328B: Mondy, AbAO and Kitab optical observations
Date
2023-03-28T21:40:25Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), R. Ya. Inasaridze (AbAO), E. Klunko (ISTP), A.
Novichonok (Petrozavodsk State University, KIAM), A. Pozanenko (IKI), N.
Pankov (HSE, IKI), D. Datashvili (AbAO), V. R. Ayvazian (AbAO), G. V.
Kapanadze (AbAO) report on behalf of GRB IKI FuN:
We observed the field of Swift GRB 230328B (Gropp et al. GCN 33527;
Osborne et al. GCN 33529) till now with AZT-33IK telescope of Mondy
observatory in R-filter, RC-36 telescope of Kitab observatory in
Clear, AS-32 telescope of Abastumani observatory in R-filter. The
optical afterglow (Gropp et al. GCN 33527; Pankov et al. GCN 33528) is
detected in Mondy and Abastumani, and not detected in Kitab observatory.
Preliminary photometry of a stacked images is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2023-03-28 16:19:20 0.062188 R 5*120 19.34 0.10 21.0
2023-03-28 16:37:07 0.042338 Clear 19*60 n/d n/d 17.6
2023-03-28 16:15:48 0.086725 R 104*60 19.50 0.10 21.2
The photometry is based on nearby USNO-B1.0 stars.
Approximation of above photometry in R-filter and photometry reported
early (GCN 33528) results in the power law index of -0.45 of slow decay
LC of GRB 230328B.