GCN Circular 17242
Subject
GRB 141225A: Swift/UVOT refined analysis
Date
2014-12-26T18:37:57Z (9 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141225A
428 s after the BAT trigger (D'Avanzo et al., GCN Circ. 17229). The optical
afterglow has been reported (Gorosabel et al, GCN Circ. 17230; Guidorzi et
al.,
GCN Circ. 17231; Malesani et al., GCN Circ. 17232; Kuin & D'Avanzo,
GCN.Circ.
17233; Xu et al., GCN Circ. 17236; Buckley et al., 17237; Sonbas et al.,
GCB
Circ. 17240) with a redshift of z=0.915 (Gorosabel et al., GCN Circ. 17234).
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 428 578 147 18.81 +/- 0.06
white 858 1008 147 19.76 +/- 0.10
v 735 1406 78 >19.2
b 660 1495 86 >19.5
u 636 1481 97 19.19 +/- 0.19
w1 611 1456 97 >19.0
m2 760 780 19 >18.6
w2 6480 6680 197 >19.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).