GCN Circular 22202
Subject
GRB 171205A: Continued Swift/UVOT Observations
Date
2017-12-07T17:40:15Z (6 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU), P. J. Brown (Mitchell Institute, TAMU),
S.W.K. Emery (UCL-MSSL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT has continued observations of the optical transient in
GRB 171205A (D���Elia et al., GCN Circ. 22177). We find that photometry
in the optical passbands is consistent with either steady flux or slight
decline, consistent with the report of Mao et al. (GCN Circ. 22195). However,
all four UV passbands show a significant decay over the first day of
observations. Preliminary detections 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 155 3850 183 18.05+-0.07
white 5524 28415 1081 17.85+-0.05
white 188009 193590 703 18.58+-0.08
v 5934 22497 903 18.09+-0.08
v 46094 57628 150 18.26+-0.24
v 74068 142426 350 18.20+-0.12
b 3608 3808 196 18.69+-0.10
b 26595 27502 885 18.53+-0.06
b 38171 61189 254 18.43+-0.08
b 67064 141691 379 18.69+-0.08
u 312 391 77 17.75+-0.18
u 16032 16558 513 17.54+-0.06
u 38114 61132 254 17.66+-0.08
u 67030 141669 379 18.32+-0.09
uvm2 9466 10366 885 16.67+-0.06
uvm2 46150 57780 435 18.37+-0.15
uvm2 74102 142498 1315 18.71+-0.11
uvw1 10373 16025 1066 16.95+-0.06
uvw1 38031 61074 383 17.93+-0.10
uvw1 66981 141647 568 18.51+-0.11
uvw2 5729 28438 1098 17.06+-0.07
uvw2 40218 141597 2322 18.68+-0.08
uvw2 73989 142404 877 18.82+-0.12
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998), nor from any contribution of the host galaxy.