TITLE:   GCN CIRCULAR
NUMBER:  35349
SUBJECT: GRB 231215A: Mondy optical bright afterglow detection
DATE:    23/12/15 12:55:34 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

N. Pankov (HSE, IKI),  A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:

We observed the field of Swift GRB 231215A (D'Avanzo et al., GCN 35343; Evans et al., GCN 35345)  with AZT-33IK telescope of Mondy observatory  in  R-filter starting  on  2023-12-15 (UT) 11:17:39.  Preliminary photometry of the fist immaes reveals a new bright source within XRT error circle (Evans et al., GCN 35345)

Date       UT start  t-T0     Exp.   Filter   OT     Err.
                   (mid, days)  (s)
2023-12-15 11:17:39  0.063363  1x120 R        17.42  0.07
 
The photometry is based on nearby USNO-B1.0 R2 stars.
 
We also may suggest that GCN 35347 (Lipunov et al.) refer to the afterglow of GRB 231215A.