[vsnet-grb-info 21040] GRB 180812A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Aug 14 03:25:32 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 23138
SUBJECT: GRB 180812A: Swift/UVOT Detection
DATE: 18/08/13 18:24:45 GMT
FROM: Sam LaPorte at PSU <sjl5346 at psu.edu>
GRB 180812A: Swift/UVOT Detection
S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180812A
112 s after the BAT trigger (Lien et al., GCN Circ. 23129).
A fading source consistent with the XRT position
(Goad et al. GCN Circ. 23131)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 16:23:20.45 = 245.83522 (deg.)
Dec (J2000) = 74:39:52.9 = 74.66471 (deg.)
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence),
consistent with detections reported by BOOTES-5/JGT (Carrasco et al. GCN
Circ. 23130) and COATLI (Watson et al. GCN Circ. 23132).
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 140 289 431 19.81 +/- 0.17
white 1551 2092 77 >20.85
v 600 6610 372 >18.9
b 526 5994 352 >20.0
u 270 5789 598 >19.8
w1 650 6857 211 >19.5
m2 6616 6815 197 >20.2
w2 6206 6406 197 >20.2
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).
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