GCN Circular 23317
Subject
GRB 181010A: Swift/UVOT Detection
Event
Date
2018-10-10T12:55:25Z (7 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181010A
96 s after the BAT trigger (Melandri et al., GCN Circ. 23309).
A source consistent with the XRT position
(Evans et al. GCN Circ. 23313)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 03:30:16.89 = 52.57038 (deg.)
Dec (J2000) = -23:02:15.4 = -23.03761 (deg.)
with an estimated uncertainty of 0.49 arc sec. (radius, 90% confidence),
consistent with (MASTER-OAFA, Gorbovskoy et al., GCN Circ. 23310;
LCO Cerro Tololo, Martone et al., GCN Circ. 23311; RATIR, Troja et al., GCN Circ. 23312;
VLT/X-shooter, Vielfaure et al., GCN Circ. 23315)
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 96 246 147 19.42 +/- 0.09
white 589 6359 247 >21.0
v 3867 5503 393 >19.4
b 564 6323 413 >20.9
u 309 6117 639 >20.6
uvw1 4277 5912 393 >20.1
uvm2 4072 5707 393 >20.7
uvw2 5098 5298 197 >20.5
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).