[vsnet-grb-info 9894] GRB 101008A: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11352
SUBJECT: GRB 101008A: optical observations
DATE:    10/10/18 10:06:08 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss at gmail.com>

V. Rumyantsev (CrAO),  A. Pozanenko (IKI)  report on behalf of larger GRB
follow-up collaboration:

We observed  the field  of the Swift GRB 101008A (Baumgartner et al., GCN
11318) with ZTE telescope of SAI MSU observatory on Oct. 12 (UT) 18:57 -
20:42. We clearly detect objects S1 and S3 (Moskvitin  et al., GCN 11324) in
coordinates (J2000) RA=21 55 29.91, Dec=+37 03 56.6 and RA=21 55 29.85,
Dec=+37 04 05.0, correspondingly. We do not detect the object  S2
(Moskvitin  et al., GCN 11324; Nardini et al., GCN 11326). The photometry is
based on the same USNO star as Moskvitin et al.

Source,  T0+,     Filter,   Exposure,    mag.,        Upper Limit (3 sigma)
             (mid, d)              (s)

S1        4.1297    R       97x60           21.0 +/- 0.1      22.4
S2        4.1297    R       97x60           21.6 +/- 0.2      22.4

Since we do not detect the afterglow candidate S2 up to R=22.4 we can
confirm the GRB 101008A afterglow detection.
The finding chart can be found at
http://grb.rssi.ru/GRB101008A/GRB101008a_101012_ZTE.gif