[vsnet-grb-info 8303] GRB 090817: aphotometry of USNO-B1.0 341-0096763

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9828
SUBJECT: GRB 090817: aphotometry of USNO-B1.0 341-0096763 
DATE:    09/08/19 21:51:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

V. Rumyantsev (CrAO), A. Pozanenko (IKI), M. Andreev (Terskol Branch of
Institute of Astronomy)  report on behalf of  larger GRB  follow-up
collaboration:

We report a photometry of the USNO-B1.0 object 341-0096763 in the XRT error
circle of  the X-ray afterglow (Evans et al., GCN 9819, GCN 9825) of the
INTEGRAL GRB 090817 (Beckmann et al., GCN 9815).  The observations took
place  with Shajn telescope of  CrAO on Aug.17 (Rumyantsev et al., GCN
9826). The photometry is based on the reference star USNO B1.0 1341-0096766
(04 15 48.35  +44 08 07.7) assuming R = 17.54, only statistical errors are
quoted.  Upper limits are presented for isolated object. To make any
conclusion about variability of the star or the presence in the tail of the
star other possible source we are planning second epoch observation.

Date        Time start (UT)   Upper_Limit  R_mag

2009-08-17  01 09 36.45  21.5  19.33 +/-0.05
2009-08-17  01 10 40.62  21.5  19.38 +/-0.05
2009-08-17  01 13 23.49  21.7  19.43 +/-0.04
2009-08-17  01 14 27.16  21.7  19.32 +/-0.04
2009-08-17  01 15 30.91  21.8  19.35 +/-0.04
2009-08-17  01 16 34.72  21.9  19.46 +/-0.04
2009-08-17  01 17 38.27  21.9  19.40 +/-0.04
2009-08-17  01 18 41.93  21.9  19.44 +/-0.04
2009-08-17  01 19 45.99  21.7  19.39 +/-0.04
2009-08-17  01 20 49.53  21.7  19.37 +/-0.04
2009-08-17  01 21 53.11  21.8  19.45 +/-0.04
2009-08-17  01 22 58.16  21.7  19.40 +/-0.04
2009-08-17  01 24 01.75  21.8  19.28 +/-0.04
2009-08-17  01 25 05.64  21.8  19.45 +/-0.04
2009-08-17  01 26 09.20  21.8  19.46 +/-0.04
2009-08-17  01 27 12.86  21.8  19.39 +/-0.04
2009-08-17  01 28 16.41  21.8  19.38 +/-0.04
2009-08-17  01 29 22.52  21.6  19.38 +/-0.05
2009-08-17  01 30 26.12  21.6  19.39 +/-0.05
2009-08-17  01 31 29.63  21.6  19.38 +/-0.05
2009-08-17  01 32 33.37  21.7  19.33 +/-0.04
2009-08-17  01 33 38.37  21.6  19.39 +/-0.05
2009-08-17  01 34 42.08  21.6  19.38 +/-0.05
2009-08-17  01 35 45.77  21.6  19.42 +/-0.05
2009-08-17  01 36 49.51  21.5  19.46 +/-0.06
2009-08-17  01 37 53.18  21.4  19.34 +/-0.05
2009-08-17  01 38 56.70  21.3  19.55 +/-0.08
2009-08-17  01 40 00.31  21.3  19.44 +/-0.07
2009-08-17  01 41 06.39  21.2  19.30 +/-0.07
2009-08-17  01 42 12.89  21.2  19.47 +/-0.08
2009-08-17  01 43 16.53  21.1  19.41 +/-0.08
2009-08-17  01 44 20.34  21.1  19.43 +/-0.08
2009-08-17  01 45 24.13  20.9  19.41 +/-0.10
2009-08-17  01 46 28.68  20.9  19.42 +/-0.10
2009-08-17  01 47 32.26  20.7  19.29 +/-0.11
2009-08-17  01 48 35.81  20.7  19.52 +/-0.13