[vsnet-grb-info 6429] GRB 080727C: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8043
SUBJECT: GRB 080727C: Swift/UVOT Upper Limits
DATE:    08/07/28 19:41:18 GMT
FROM:    Erik Hoversten at Swift/Penn State  <hoversten at astro.psu.edu>

E. A. Hoversten (PSU) and A. M. Parsons (GSFC) report on behalf of the
Swift/UVOT team:

The Swift/UVOT began observing the field of GRB 080727C starting 82
seconds after the BAT trigger (Parsons, et al. GCN Circ. 8035).  We do
not detect any source in any of the filters at the UVOT-enhanced XRT
position (Osborne, et al., GCN Circ. 8038).  The 3-sigma upper limits
at this position for single exposures are:

Filter  T_start    T_stop   Exp(s)  Mag (3-sigma upper limit)
-----------------------------------------------------
white      82.1     181.0    97.3     > 20.81
white    3987.1    4186.8   196.6     > 21.58
v         187.4     587.2   393.5     > 19.89
v        4397.7    4597.5   196.6     > 19.93
b         668.8     673.4     4.6     > 17.79
u         643.0     662.8    19.5     > 18.32
uvw1      618.4     638.2    19.5     > 18.11
uvm2      593.5     613.3    19.5     > 17.61
uvw2     4192.9    4392.7   196.6     > 20.17


The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a large
reddening of E_{B-V} = 1.1 mag.  All photometry is on the UVOT flight
system described in Poole et al. (2008, MNRAS, 383, 627).