GCN Circular 19051
Subject
Further Swift/UVOT observations of GRB 160220B
Date
2016-02-22T13:52:57Z (8 years ago)
From
Massimiliano de Pasquale at IASF-Palermo <m.depasquale@ucl.ac.uk>
M. De Pasquale, A.A. Breeveld (MSSL-UCL) and J. Cummings
(GSFC/UMBC) report on behalf of the Swift/UVOT team:
Following the detection of a source at the southern edge of the 1.5''
Swift-XRT error circle (Evans et al. GCN circ. 19033) by GROND
(Wiseman and Greiner, GCN Circ. 19042) we have re-analysed
our UVOT observations We caution that the anlysis is complicated
by a crowded field and large noise.
About at the sourthern edge of the XRT error circle we detect a source
RA = 17h 19m 27.64s (259.86517)
Dec = -18d 07m 30 s (-18.12500)
with an error of ~1''. The position of this source is
copatible with that of the oject detected by GROND.
Magnitudes of this source are given in the table below.
Filter T_start(s) T_stop(s) Exp(s) Mag
v 4145 10454 1082 18.7 +/- 0.2
b 3530 5165 393 19.4 +/- 0.2
The same source is detected in successive exposures:
v 39730 62085 1072 18.7 +/- 0.2
b 44464 45371 885 19.4 +/- 0.2
As the source does not seem to have changed in brightness, we do
not think it is the optical afterglow of GRB160220B.
Magnitudes above are given in the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373).
[GCN OPS NOTE(22feb16): Per Circ 19053, the Subject-line
has been corrected from "20A" to "20B".]