[vsnet-grb-info 15490] GRB 140903A: ISON-Kislovodsk observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16779
SUBJECT: GRB 140903A:  ISON-Kislovodsk observations
DATE:    14/09/05 04:11:18 GMT
FROM:    Alexei Pozanenko at IKI  <alex at grb.rssi.ru>

A. Pozanenko (IKI), A. Volnova (IKI), N. Polyakov (ISON), E. Romas (ISON), I. Molotov (KIAM), report on  behalf of larger collaboration:

We observed the field of  GRB 140903A (Cummings et al., GCN 16763) with Santel-400AN   telescope of ISON-Kislovodsk observatory starting on Sep. 03 (UT) 18:54:36. In the enhanced XRT position (De Pasquale et al., GCN 16767) we do not detect the object (Capone  et al., GCN 16769; Cenko  et al., GCN 16770;  Fruchter, GCN 16776). A preliminary upper limit after subtraction of the nearby bright star is 16m. A formal upper limit of a point-like source in the image away of the bright nearby star is following

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

2014-09-03 18:22:05  0.14057  None     100    18.6       

The photometry is based on SDSS stars

SDSS J155213.13+273321.7 R_Lupton 15.392 &#177; 0.013
SDSS J155218.31+273433.5 R_Lupton 14.792 &#177; 0.013
SDSS J155155,39+273948,9 R_Lupton 15.421 &#177; 0.013