GCN Circular 22175
Subject
GRB 171124A: TShAO optical observations
Date
2017-12-01T12:48:25Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (FAPHI), I. Reva
(FAPHI), A. Volnova (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Fermi/LAT-detected burst GRB 171124A
(Longo et al. GCN 22156) with Zeiss-1000 1-m telescope of Tien Shan
Astronomical Observatory starting on Nov. 27 (UT) 12:28:32. We took
several images in R-filter with exposures of 120 s. We cover all LAT-
localization region.
The three XRT sources ## 1,3,4 (Osborne et al. GCN 22165) are
detected in our stacked image. These sources are also presented in the
USNO-B1.0 catalogue. We do not detect any optical object within X-ray
afterglow (XRT #2 error circle, Osborne et al. GCN 22174). We may
note that 4.5 arcsec South of XRT #2 we detect a galaxy which is also
present in USNO-B1.0.
Preliminary photometry of the field is following:
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s) (3 sigma)
2017-11-27 12:28:32 3.31825 R 40*120 n/d n/d 22.0
The finding chart of the 32 XRT source can be found at
http://grb.rssi.ru/GRB171124A/GRB171124A_XRT2.png
The photometry is based on nearby USNO-B1.0 stars
USNO-B.1_id R2
1251-0500105 14.64
1252-0499091 16.06
1251-0500220 15.86
1251-0500271 16.17
1251-0500270 16.12
1251-0500372 16.06
