GCN Circular 17673
Subject
GRB 150403A: Swift/UVOT Detection
Date
2015-04-04T13:51:07Z (10 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) 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 150403A
85 s after the BAT trigger (Lien et al., GCN Circ. 17665). A source
consistent with the XRT position (Beardmore et al. GCN Circ. 17666)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 20:46:01.15 = 311.50479 (deg.)
Dec (J2000) = -62:42:41.0 = -62.71139 (deg.)
with an estimated uncertainty of 0.42 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 85 235 147 14.89 +/- 0.02
v 627 647 20 16.49 +/- 0.13
b 553 573 20 16.65 +/- 0.08
u 298 547 246 16.14 +/- 0.03
w1 676 5286 294 19.68 +/- 0.21
m2 6317 23414 1178 >22.2
w2 5907 7536 387 >20.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).