[vsnet-grb-info 17797] GRB 160327A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19239
SUBJECT: GRB 160327A: Swift/UVOT Upper Limits
DATE:    16/03/28 13:55:52 GMT
FROM:    Marissa McCaule at PSU  <marissamc at swift.psu.edu>

L. M. McCauley (PSU) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160327A
71 s after the BAT trigger (Racusin et al., GCN Circ. 19235).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 19237) 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               71         221         147      >21.06
u_FC                  284         534         246      >20.52
white                  71        5902         535      >21.50
v                     613        6310         451      >19.66
b                     539        5702         254      >20.38
u                     283        6918         670      >20.66
uvw1                  662        6721         412      >20.21
uvm2                  637        1088          58      >18.49
uvw2                  589        1039          38      >18.61


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).