GCN Circular 20074
Subject
GRB 161017A: Swift/UVOT Detection
Event
Date
2016-10-18T12:34:01Z (9 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161017A
68 s after the BAT trigger (Troja et al., GCN Circ. 20064, Yurkov et
al., GCN Circ. 20063).
The UVOT source described in Troja et al., GCN Circ. 20064, is at a
position consistent with the enhanced XRT position (Beardmore et al.,
GCN Circ. 20067) and is found to be fading.
The preliminary UVOT position is:
RA (J2000) = 09:31:04.60 = 142.76915 (deg.)
Dec (J2000) = +43:07:36.3 = 43.12676 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early
exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 68 217 147 14.08 �� 0.02
v 609 629 20 15.14 �� 0.09
b 535 555 20 15.60 �� 0.06
u 280 529 246 14.56 �� 0.02
uvw1 658 661 2.7 15.5 �� 0.3
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.02 in the direction of the
burst (Schlegel et al. 1998).