[vsnet-grb-info 18048] GRB 160601A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19496
SUBJECT: GRB 160601A: Swift/UVOT Upper Limits
DATE:    16/06/03 15:28:24 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

S. Sebzda (Penn State/Swift) 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 160601A
78 s after the BAT trigger (Kocevski et al., GCN Circ. 19478).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 19484) 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)       78             227          147      >21.00
white            78      	589          166      >20.90
v               619             639           19      >17.30
b               544             564           19      >18.32
u (fc)          289             539    	     491      >20.19
uvw1            668             688           19      >17.72
uvm2            643             663           19      >17.46
uvw2            595             615           19      >17.87

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).