GCN Circular 22857
Subject
GRB 180626A: Swift/UVOT Detection
Date
2018-06-26T15:22:56Z (7 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180626A
123 s after the BAT trigger (Evans et al., GCN Circ. 22850).
A fading source consistent with the XRT position (Osborne et al. GCN
Circ. 22852) and also seen by Martone et al. (GCN Circ. 22854) and Troja
et al. (GCN Circ. 22855) is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for
the finding chart (FC) and early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 123 273 147 20.57 �� 0.22
white 633 1033 190 >21.4
v 665 6473 452 >20.2
b 591 5858 246 >20.4
u 336 6936 529 >20.7
w1 714 6882 432 >21.0
m2 5043 6677 393 >20.1
w2 641 6268 432 >21.3
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.04 in the direction of the
burst (Schlegel et al. 1998).