GCN Circular 16499

A. Moskvitin (SAO-RAS, N. Arkhyz), R. Burenin (IKI, Moscow),
R. Uklein, V. Sokolov, T. Sokolova (SAO-RAS, N. Arkhyz),
on behalf of a larger collaboration, report:

We performed the photometrical monitoring of the GRB 140629A OT (Lien
et al., GCNC 16477) with two optical telescopes of SAO RAS: the 6-m
BTA (V band) and the 1-m Zeiss-1000 (BVRcIc bands) on the night of
June, 29/30. Observations started 4.1 hours after the Swift trigger.
The optical transient (Lien et al., GCNC 16477; Yurkov et al.,
GCNC 16478; Bikmaev et al., GCNC 16482; Masi, GCNC 16483; Maehara,
GCNC 16484; Malesani et al., GCNC 16485; Sonbas et al., GCNC 16486;
and other teams) is clearly detected in every single image.

On the basis of the same star from USNO-B1 as Bikmaev et al. (GCNC 16482)
with the coordinates R.A., = 16:35:59.9, Decl.= +41:51:10, J2000 and
magnitude R1_mag = 16.49 we made preliminary photometric estimations
of the OT Rc images. The results are as follows:

#  Start,UT  exp,s   R_mag +/- err
====================================
 1  19:00:41  180.00  18.02 +/- 0.05
 2  19:05:38  180.00  18.20 +/- 0.05
 3  19:11:11  180.00  18.45 +/- 0.07
 4  19:28:39  300.00  18.25 +/- 0.04
 5  20:03:55  300.00  18.53 +/- 0.04
 6  20:26:36  300.00  18.58 +/- 0.04
 7  20:53:25  300.00  18.87 +/- 0.04
 8  22:10:17  300.00  19.00 +/- 0.05
 9  22:33:32  300.00  19.11 +/- 0.05
10  22:57:16  300.00  19.00 +/- 0.05
11  23:25:27  300.00  19.31 +/- 0.09
12  23:49:07  300.00  19.38 +/- 0.11

Further analysis and observations go on.