GCN Circular 20644
Subject
GRB 170208A: Swift/UVOT Upper Limits
Date
2017-02-09T14:45:54Z (7 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and A. Cholden-Brown (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170208A
125 s after the BAT trigger (Cholden-Brown et al., GCN Circ. 20631).
No optical afterglow consistent with the enhanced XRT position
(Evans et al. GCN Circ. 20634)
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) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 125 275 148 >21.4
u_FC 337 587 246 >20.7
white 125 1365 373 >21.9
v 667 1415 97 >19.3
b 593 1503 87 >19.4
u 337 1489 324 >20.2
w1 717 1464 78 >19.4
w2 642 1390 97 >19.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).