[vsnet-grb-info 17465] GRB 160117A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18892
SUBJECT: GRB 160117A: Swift/UVOT Upper Limits
DATE:    16/01/19 02:00:12 GMT
FROM:    Lea Hagen at PSU  <lea.zernow.hagen at gmail.com>

L. M. Z. Hagen (PSU) and C. B. Markwardt (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160117A
68.7 ks after the BAT trigger (Markwardt et al. GCN Circ. 18874). No
optical afterglow consistent with the XRT position of Source 1 (Maselli
et al. GCN Circ. 18888) 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 exposures
are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

v                75251        76158          885         >19.75
u                70499        70799          295         >19.80
w1               69593        80420         1226         >20.52
m2               68687        76854         1565         >20.90

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).