GCN Circular 26287
Subject
GRB 191123A: Swift/UVOT further analysis
Date
2019-11-24T00:57:25Z (5 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and A. Tohuvavohu (U. Toronto)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191123A
78 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 26279).
A source consistent with the XRT position (Goad et al. GCN Circ. 26284)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 14:21:02.88 = 215.26200 (deg.)
Dec (J2000) = +22:51:36.1 = 22.86002 (deg.)
with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).
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 78 228 147 18.25 +/- 0.05
v 620 2111 175 18.28 +/- 0.19
b 546 1168 58 19.18 +/- 0.25
u 290 6376 501 >20.4
w1 669 6171 372 >19.9
m2 1074 5966 216 >19.8
w2 595 12186 944 >20.9
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).