[vsnet-grb-info 18568] GRB 161007A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20016
SUBJECT: GRB 161007A: Swift/UVOT Upper Limits
DATE:    16/10/08 17:29:28 GMT
FROM:    Lea Hagen at PSU  <lea.zernow.hagen at gmail.com>

L. M. Z. Hagen (PSU) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 161007A
133 s after the BAT trigger (D'Elia et al., GCN Circ. 20008). No
optical afterglow consistent with the XRT position (Goad et al., GCN
Circ. 20013) or the possible GTC optical counterpart (de Ugarte
Postigo et al., GCN Circ. 20014) 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 early
exposures are:

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

white              133         1716          411         >20.79
v                  621         1593          116         >18.39
b                  547         1691          116         >19.26
u                  291         1666          343         >19.73
uvw1               671         1642          116         >18.69
uvm2               646         1617          116         >18.81
uvw2               596         1735          129         >19.04


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.12 in the direction of the burst
(Schlegel et al. 1998).