[vsnet-grb-info 21209] GRB 181002A: Mondy optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23308
SUBJECT: GRB 181002A: Mondy optical upper limit
DATE:    18/10/05 07:28:44 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI),  A. Pozanenko (IKI),  E. Klunko (ISTP),  A. Volnova 
(IKI) report on behalf of of larger GRB follow-up collaboration:

We observed the field of the GRB 181002A (Gropp et al., GCN 23290) 
with AZT-33IK telescope of Sayan observatory (Mondy).  We obtained 
several images in R-filter starting on Oct. 02 (UT) 16:31:56.  We do not 
detect any object within enhanced Swift-XRT position  (Beardmore et al., 
GCN 23292). Preliminary photometry of the field is following.

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


2018-10-02  16:31:56  0.23281    R     58*60  n/d     n/d   22.9

The photometry is based on nearby SDSS-DR12 stars

SDSS-DR12_id        R(Lupton)
J041903.61+151252.8 18.69
J041903.16+151309.7 18.40
J041848.32+151242.2 16.52
J041904.57+151201.2 17.35
J041857.89+151107.8 17.14