[vsnet-grb-info 18974] GRB 170115A : AbAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20479
SUBJECT: GRB 170115A : AbAO optical upper limit
DATE:    17/01/17 17:16:40 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of the GRB 170115A (Page et al., GCN Circ. 20462) 
with AS-32 (0.7m) telescope of Abastumani Observatory  on Jan., 16 (UT) 
14:57:24. We obtained several unfiltered images of the field. No source 
is found within enhanced XRT position (Osborne et al. GCN Circ. 20465).
Preliminary photometry  of the field is following

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

2017-01-16  14:57:24   0.78450   CR     49*60  n/d   n/d 22.5

Photometry is based on nearby SDSS_DR9 stars
SDSS_DR9_id R(Lupton)
J220832.66+134330.8 18.50
J220831.22+134259.5 18.59
J220831.94+134225.7 18.57
J220847.68+134539.9 16.60
J220833.30+133952.6 16.32
J220835.19+134539.0 17.66
J220837.56+134537.8 15.86