TITLE:   GCN CIRCULAR
NUMBER:  23341
SUBJECT: GRB 181013A: AbAO optical upper limit
DATE:    18/10/15 18:04:31 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

 E. Mazaeva (IKI),  S. Belkin (IKI),  A. Pozanenko (IKI), R. Inasaridze 
(AbAO), V. Ayvazian  (AbAO),  O. Kvaratskhelia (AbAO), G. Kapanadze (AbAO), 
A. Volnova  (IKI),  I. Molotov (KIAM) report on behalf of larger GRB 
follow-up collaboration:

We observed the field of the Swift GRB 181013A (D'Avanzoet al., GCN 23332) 
with AS-32 (0.7m) telescope of Abastumani Observatory starting on  Oct. 13 
(UT) 15:23:15 .   We do not detect any object within  XRT position (Osborne 
et al., GCN 23334). Preliminary  photometry of the field is following:

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

2018-10-13 15:23:15    0.54312    R      58*60  n/d   n/d  21.0

The photometry is based on nearby SDSS-DR12 stars
SDSS-DR12_id R(Lupton)
J135025.82+400818.8 16.99
J135102.99+401021.5 16.36
J135015.70+400244.5 13.69
J135009.92+400351.8 13.87
J135009.71+400308.0 14.87