GCN Circular 22922
Subject
GRB 180706A: Swift/UVOT Detection
Date
2018-07-06T18:42:37Z (6 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (U.Warwick) and M. Stamatikos (OSU/NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180706A
95 s after the BAT trigger (Stamatikos et al., GCN Circ. 22909).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 22916) and the COATLI optical detection
(Watson et al. GCN Circ. 22910) 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 early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white (FC) 95 245 147 19.88 +/- 0.34
white 587 607 20 18.11 +/- 0.21
v 637 1582 117 >18.5
b 563 756 39 18.34 +/- 0.30
u 308 557 246 17.90 +/- 0.12
w1 686 1459 78 18.44 +/- 0.33
m2 661 1606 117 >18.8
w2 613 1558 117 >19.1
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).