GCN Circular 20282
Subject
GRB 161217A: Swift/UVOT Upper Limits
Date
2016-12-17T17:26:54Z (8 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161217A
163 s after the BAT trigger (D'Elia et al., GCN Circ. 20276).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al., GCN Circ. 20278)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 163 308 142 >21.0
u_FC 314 564 246 >21.0
white 163 1713 406 >21.2
v 644 1589 117 >18.8
b 576 1689 111 >19.8
u 314 1664 343 >20.4
w1 693 1639 97 >20.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).