GCN Circular 20339
Subject
GRB 161224A: Swift/UVOT Upper limits
Date
2016-12-26T12:12:17Z (7 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and A. Cholden-Brown (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161224A
28.3ks after the BAT trigger after a Sun constraint (Cholden-Brown
et al., GCN Circ. 20335). At the position of the XRT source (Cholden-Brown
and
Evans, GCN Circ. 20338) no uv-optical source was found to the upper limits
below.
Preliminary 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
u 44266.0 44786.3 508 >19.99
v 28322.2 50899.7 1770 >19.90
uvw1 35223.6 41032.4 786 >19.91
uvw2 46285.0 46772.6 480 >19.88
uvm2 29234.3 35216.6 1198 >20.48
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.096 in the direction of the burst
(Schlegel et al. 1998).