[vsnet-grb-info 20755] GRB 180626A: ISON-MN optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22853
SUBJECT: GRB 180626A: ISON-MN optical observations
DATE:    18/06/26 11:25:47 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

L. Elenin (KIAM), E. Mazaeva (IKI),  A. Pozanenko (IKI),  A. Volnova 
(IKI), I. Molotov (KIAM) report on behalf of larger GRB  follow-up 
collaboration:

We observed the field of  the Swift GRB 180626A  (Evans et al., GCN 
22850) with ISON-NM observatory. Observation started 51 s after burst 
trigger. We do not find optical afterglow (Evans et al., GCN  22850) in 
a combined image of first 5 frames. Preliminary photometry of the filed 
is following.


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

2018-06-26  08:22:07 0.00146  CR    5* 20  n/d  n/d    17.3

The photometry is based on several nearby USNO-B1.0 stars.