GCN Circular 22396
Subject
GRB 180205A: Swift/UVOT Detection
Event
Date
2018-02-06T12:58:32Z (8 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (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 180205A
182 s after the BAT trigger (Evans et al., GCN Circ. 22381).
A fading source consistent with the XRT position
(Page et al., GCN Circ. 22394),
also detected by (Zheng et al. GCN 22382;
Bolmer et al. GCN 22383; Tanvir et al. GCN 22384;
Volnova et al. GCN 22387; Falcon et al. GCN 22390; Xin et al. 22392;
Zhu et al. GCN 22395)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 08:27:16.74 = 126.81975 (deg.)
Dec (J2000) = +11:32:30.9 = 11.54191 (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 first finding chart (FC) exposure and the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 182 331 147 15.75 +/- 0.02
white 540 732 36 16.33 +/- 0.02
v 158 612 52 16.11 +/- 0.09
b 515 710 39 16.65 +/- 0.07
u 490 686 39 16.82 +/- 0.07
uvw1 466 661 39 16.04 +/- 0.10
uvm2 441 636 39 16.32 +/- 0.15
uvw2 391 585 39 17.06 +/- 0.17
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).