GCN Circular 22239
Subject
GRB 171211A: Swift/UVOT Upper Limits
Event
Date
2017-12-11T17:01:01Z (9 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171211A
362 s after the BAT trigger (Gropp et al., GCN Circ. 22234).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 22236)
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 initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 387 6321 491 >19.0
uvw1 436 6731 491 >19.7
uvm2 5503 6526 393 >19.9
uvw2 362 6939 668 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.11 in the direction of the burst
(Schlegel et al. 1998).