GCN Circular 17219
Subject
GRB 141221A: Swift/UVOT Detection
Date
2014-12-22T17:26:04Z (9 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and E. Sonbas (NASA/GSFC/Adiyaman Univ.)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141221A
84 s after the BAT trigger (Sonbas et al., GCN Circ. 17206).
A source consistent with the enhanced XRT position
(Beardmore et al. GCN Circ. 17211)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 13:13:08.81 = 198.28672 (deg.)
Dec (J2000) = +08:12:18.8 = 8.20522 (deg.)
with an estimated uncertainty of 0.43 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 84 234 147 17.33 � 0.04
v 626 646 19 17.43 � 0.26
b 552 571 20 17.92 � 0.21
u 296 546 246 17.62 � 0.07
w1 4061 4261 197 >20.0
m2 3856 10742 414 >20.9
w2 6231 6399 165 >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).