[vsnet-grb-info 16752] GRB 150716A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18033
SUBJECT: GRB 150716A: Swift/UVOT Upper Limits
DATE:    15/07/17 21:08:31 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

S. J. LaPorte (PSU) and D. Kocevski (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150716A
86 s after the BAT trigger (Kocevski et al., GCN Circ. 18027).
No optical afterglow consistent with the enhanced XRT position
(Sbarufatti et al. GCN Circ. 18030)
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)          86          213          125         >19.8
white            11701        12468          747         >21.11
v                 5994         6193          196         >18.62
b                 5378        22713         1512         >20.86
u                 6608         6721          111         >19.17
uvw1              6404         6603          196         >19.38
uvm2              6198         6398          196         >19.38
uvw2              5789         5989          196         >19.61
 
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.43 in the direction of the burst
(Schlegel et al. 1998).