GCN Circular 17111
Subject
GRB 141121A: Mondy optical observations
Event
Date
2014-11-28T19:21:59Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev
(ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of GRB 141121A (Lien et al., GCN 17075) with
AZT-33IK telescope of Sayan observatory (Mondy) on Nov., 27 starting
(UT) 19:13:37. We obtained several images in R-filter ander favorable
weather and mean FWHM of 1.8 arcsec. In a combined image we clearly
detect optical afterglow (Tanga et al., GCN 17078; Perley et al., GCN
17081). We do not detect the nearby source reported in (Watson et al.,
GCN 17075). Instead of we detect a Source (possible host?) 3 arcsec to
the West from OT. The Source is absent in SDSS DR9. Coordinates of the
OT and the Source are
OT
(J2000)
08 10 40.55 +22 13 03.0
with accuracy of 0.4" in both coordinates
The Source to the West
(J2000)
08 10 40.35 +22 13 03.0
with accuracy of 0.5" in both coordinates
Astrometry solutions are based on USON-B1.0 catalog.
A preliminary photometry of the OT is based on nearby SDSS stars:
date UT start t-T0 Filter Exp. OT OT_err
(mid, days) (s)
2014-11-27 19:13:37 6.6923 R 72*120 21.57 0.05
And preliminary photometry of the Source is R 22.95 �� 0.11.
The source is barely visible in our earlier observations (Mazaeva et
al., GCN 17102) and photometry of the early observation reported in
(Mazaeva et al., GCN 17102) might be biased of this Source.
The finding chart can be found in
http://grb.rssi.ru/GRB141121A/GRB141121A.Mondy_host_chart.png