GCN Circular 17089
Subject
GRB 141121A: AAO optical observations
Event
Date
2014-11-23T13:36:48Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), R. Inasaridze (AAO), A. Volnova (IKI), Molotov (KIAM),
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 AS-32
(0.7m) telescope of Abastumani Observatory. Observations were performed
under mean seeing (FWHM) of 3.5". We obtained several unfiltered images
on Nov. 21 starting on (UT) 20:01:35. Within enhanced XRT position
(Evans et al., GCN 17080) we clearly detected afterglow of GRB 141109A
(Tanga et al., GCN 17078; Perley et al., GCN 17081). Preliminary
photometry is following:
date UT start t-T0 Filter Exp. OT OT_err
(mid, days) (s)
2014-11-21 20:01:35 0.73241 clear 54*120 20.08 0.05
The photometry is based on several SDSS-DR9 stars R magnitudes
transformed from SDSS-DR9 based on Lupton transformations:
SDSS_id R(Lupton)
J081028,70+221318,9 16,317
J081049,68+221012,2 17,148
J081048,76+220822,7 14,413
J081106,66+221346,9 14,626