[vsnet-grb-info 17951] GRB 160506A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19398
SUBJECT: GRB 160506A: Swift/UVOT Upper Limits
DATE:    16/05/06 15:13:11 GMT
FROM:    Lea Hagen at PSU  <lea.zernow.hagen at gmail.com>

L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160506A
102 s after the BAT trigger (Hagen et al., GCN Circ. 19394). No optical
afterglow consistent with the XRT position (Osborne et al. GCN Circ.
19395) 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

v                  407         2279          233        >19.36
b                  357         2229          252        >20.37
u_FC               101          351          245        >20.13
u                  101         2353          626        >20.58
uvw1               457         2329          233        >19.75
uvm2               432         2304          233        >19.52
uvw2               383         2255          252        >19.86


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.26 in the direction of the burst
(Schlegel et al. 1998).