[vsnet-grb-info 18581] GRB 161011A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20029
SUBJECT: GRB 161011A: Swift/UVOT Upper Limits
DATE:    16/10/11 17:23:48 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 161011A
118 s after the BAT trigger (D'Elia et al., GCN Circ. 20023).
No optical afterglow consistent with the XRT position
(Osborne et al., GCN Circ. 20026) 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           118          268          147         >20.7
u_FC               330          580          246         >20.0
white              118         1009          334         >21.1
v                  660         6564          255         >19.4
b                  586        11301          252         >20.3
u                  330        11089         1170         >20.6
w1                 709         6889          152         >20.4
m2                6569         6769          197         >20.3
w2                1015         6359          216         >20.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).