TITLE:   GCN CIRCULAR
NUMBER:  35232
SUBJECT: GRB 231129A: optical upper limit in Mondy observatory
DATE:    23/11/30 11:05:26 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

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

We observed the field of Swift GRB 231129A (Gropp et al., GCN 35208; Mereghetti et al., GCN 35209; Zhang et al., GCN 35210) with AZT-33IK telescope of Mondy observatory in R-filter on 2023-11-29 starting (UT) 10:43:30. We do not detect any optical objects within the enhanced Swift-XRT error box (Goad et al., GCN 35220). Preliminary photometry of a stacked image is following

Date        UT start   t-T0          Exp.  Filter  OT   Err. UL(3sigma)
                                           (mid, days)  (s)

2023-11-29  10:43:30   0.25730       33x120 R      n/d  n/d  23.1

The photometry is based on nearby USNO-B1.0 stars.
USNO-B1.0
RA DEC R2
21:10:16.6747200 +41:33:09.000000 17.36
21:10:16.0548000 +41:32:49.822800 18.82