[vsnet-grb-info 14027] Fermi 403206457 / GRB 131011A: AAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15341
SUBJECT: Fermi 403206457 / GRB 131011A: AAO optical observations
DATE:    13/10/15 18:50:42 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova (IKI), R. Inasaridze (AAO), G. Inasaridze (AAO), V. 
Zhuzhunadze (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the optical afterglow (Kasliwal et al. 2013, GCN 15324; Xu 
et al. 2013, GCN 15325; Perley et al. 2013, GCN 15327; Sudilovsky et al. 
2013, GCN 15328) of Fermi trigger 403206457 / GRB 131011A (Jenke, GCN 
15331) with AS-32 (0.7m) telescope of Abastumani Observatory  on Oct. 12 
starting (UT) 22.32. We obtained several unfiltered images of 120 s 
exposure. The optical afterglow is clearly visible in a stacked image in 
coordinates (J2000) RA= 02 10 06.32 Dec= -04 24 40.5
(uncertainty of 0.33 arcseconds on both axes) which is coincide with 
position reported  by Kasliwal et al. (GCN 15324).

The photometry of combined image against nearby SDSS stars reported by
Xu et al. (GCN 15325), R magnitude, transformed by Lupton gri -> R
transformation is following:

Date        T_start     t-t0,      exp,    OT
             (UT)        mid, d     s
2013-10-12  22:32:33    1.2218     26x120  21.33 +/- 0.09

A finding chart can be found at 
http://grb.rssi.ru/GRB131011A/GRB131011A_AS32.png