GCN Circular 15795
Subject
GRB 140206A: Swift/UVOT Detection
Event
Date
2014-02-06T18:20:25Z (12 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (UCL-MSSL) and A. Y. Lien (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140206A
52 s after the BAT trigger (Lien et al., GCN Circ. 15784).
A source consistent with the XRT position (Osborne et al. GCN Circ. 15793)
and the optical positions reported by Oksanen et al. (GCN 15786) and
Yurkov et al. (GCN 15788) is detected in the initial UVOT exposures. The
lack of detections in the UV filters suggests a redshift ~2 - 3.
The preliminary UVOT position is:
RA (J2000) = 09:41:20.26 = 145.33442 (deg.)
Dec (J2000) = +66:45:38.6 = 66.76072 (deg.)
with an estimated uncertainty of 0.50 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 52 202 147 15.88 +/- 0.02
v 596 616 20 15.75 +/- 0.11
b 522 542 20 16.51 +/- 0.09
u 264 514 246 16.18 +/- 0.04
w1 645 17944 963 >20.9
m2 16137 24450 1607 >21.2
w2 21898 22798 886 >21.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.14 in the direction of the burst
(Schlegel et al. 1998).