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GCN Circular 33530

GRB 230328B: Mondy, AbAO and Kitab optical observations
2023-03-28T21:40:25Z (6 months ago)
Alexei Pozanenko at IKI, Moscow <>
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.
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