GCN Circular 22831
Subject
GRB 180623A: Swift/UVOT Detection
Date
2018-06-24T13:58:14Z (6 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180623A
86 s after the BAT trigger (Page et al., GCN Circ. 22828).
A source consistent with the XRT position (Evans et al. GCN Circ. 22829)
is detected in the initial UVOT exposures.
The UVOT refined position is ra, deg = 214.5288,-60.2541 deg which is
RA = 14:18:06.9
Dec = -60:15:14.8
with an estimated uncertainty of 1".
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 86 236 150 >20.68
white 878 997 119 20.04 +/- 0.24
v 629 6296 432 >19.2
b 18042 18207 162 19.86 +/- 0.28
u 299 17732 2252 >21.6
w1 678 16819 1318 >20.8
m2 653 6501 432 >20.0
w2 604 6092 432 >20.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 7.04 in the direction of the burst
(Schlegel et al. 1998).