GCN Circular 37953

A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report
on behalf of the GRB follow-up team.

We observed the field of GRB 241026A (The Fermi GBM team, GCN 37894
Not found
 
 
;
Melandri et al., GCN 37896
Not found
 
 
, Li et al., GCN 37909
Not found
 
 
; Zhang et al.,
GCN 37921
Not found
 
 
; Zhang, Xiong and Wang GCN 37924
Not found
 
 
; Pal et al., GCN 37929
Not found
 
 
)
with the 1-m telescope of SAO RAS, Zeiss-1000/CCD-photometer
in Rc band on October 28/29 and 29/30 nights.

The OT (Moskvitin et al., GCNs 37899
Not found
 
 
, 37916
Not found
 
 
; Watson et al., GCN 37900
Not found
 
 
;
Zheng & Filippenko GCN 37903
Not found
 
 
; Shrestha et al., GCN 37913
Not found
 
 
; Mo et al.,
GCN 37915
Not found
 
 
; Mohan et al., GCN 37918
Not found
 
 
; Izzo et al., GCN 37925
Not found
 
 
;
Wang et al., GCN 37928
Not found
 
 
) is not detected in the October 28/29 data,
but marginally detected in the October 29 stacked frame.
Preliminary results are as follows.

date   UT_start--UT_end    t_mid-T0  exp, s  R magnitude      R_lim
28/29  21:30:53--01:10:41  2.02657   500     n/d              21.6
29     17:42:02--18:36:46  2.81034   2490    22.95 +/- 0.24   23.3

The frames were calibrated against nearby USNO-B1 stars
(R2 magnitudes) and not corrected for MW extinction.