[vsnet-grb-info 21320] GRB 181110A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Nov 11 06:57:53 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 23419
SUBJECT: GRB 181110A: Swift/UVOT Detection
DATE: 18/11/10 21:56:35 GMT
FROM: Paul Kuin at MSSL <npkuin at gmail.com>
N. P. M. Kuin (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 181110A
72 s after the BAT trigger (Evans et al., GCN Circ. 23413).
The GRB was detected in ground photometry (Yamanaka et al., GCN
Circ. 23414; Murata et al., GCN Circ. 23415; Denisenko et al.
GCN Circ. 23416). The UVOT detects a source consistent
with the XRT position (Goad et al. GCN Circ. 23417) in the initial
UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 20:09:16.27 = 302.31781 (deg.)
Dec (J2000) = -36:53:47.9 = -36.89664 (deg.)
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).
Preliminary detections 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 72 222 147 18.52 +/- 0.07
v 614 634 19 16.09 +/- 0.13
b 540 559 20 16.98 +/- 0.11
u 284 534 246 16.66 +/- 0.04
w1 663 683 19 15.65 +/- 0.13
m2 1068 1088 20 14.66 +/- 0.11
w2 1018 1038 20 15.74 +/- 0.14
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).
The source showed a rebrightening with a late peak at around 1100s after
the trigger.
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