GCN Circular 13248
Subject
GRB 120422A: A Swift/UVOT Detection
Date
2012-04-22T18:23:37Z (12 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (MSSL-UCL) and E. Troja (NASA/GSFC/ORAU) report on
behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120422A
104 s after the BAT trigger (Troja et al., GCN Circ. 13243). A source
consistent with the XRT position (Beardmore et al., GCN Circ. 13247)
is detected in the summed UVOT exposures at position:
RA (J2000) = 136.91012 deg. = 09:07:38.4
Dec (J2000) = +14.018782 deg. = +14:01:07.6
with an estimated uncertainty of 1".
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_FC 104 254 147 20.39 +/- 0.27
white 857 1007 147 20.51 +/- 0.29
white 5251 6888 393 20.25 +/- 0.15
v 5662 5862 1082 >19.4
b 5047 6683 393 >20.7
u 262 512 246 19.89 +/- 0.32
u 4842 6478 393 20.00 +/- 0.31
w1 4637 12807 1039 19.84 +/- 0.18
m2 5867 6067 197 19.21 +/- 0.28
m2 11245 12145 886 19.36 +/- 0.14
w2 5457 7032 332 18.98 +/- 0.16
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).