[vsnet-grb-info 6347] GRB080710: Swift/UVOT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7965
SUBJECT: GRB080710: Swift/UVOT observations
DATE:    08/07/10 18:50:43 GMT
FROM:    Wayne Landsman at GSFC/SSAI  <wayne.b.landsman at nasa.gov>

W.B. Landsman (NASA/GSFC) and B. Sbarufatti(INAF-OAB) report on behalf 
of the Swift/UVOT team

The Swift/UVOT observed the field of GRB 08710 starting at 3186s after 
the BAT trigger ( Sbarufatti et al., GCN 7957). We detect the afterglow 
in  all seven UVOT filters at the position

RA(J2000.0)  =   00:33:05.65
DEC(J2000.0) =  +19:30:05.3

with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence).  
This position is consistent with the enhanced XRT position (Evans et al. 
GCN 7964) and the KAIT afterglow position (Li et al., GCN 7959).     The 
detection in the UVW2 (1950 A) filter is consistent with the redshift of 
~0.845 estimated from spectroscopic observations by Perley et al. (GCN 
7962).   The
white and v exposure are consistent with a decay slope of alpha ~-0.8, 
as also found by Bersier and Gomboc (GCN 7963).

The magnitudes with 1 sigma errors are reported below.

Filter    TMid(s)    Expo(s)               Magnitude
-----------------------------------------------------
white     3185          98              16.88 +/- 0.02
white     5615         186              17.37 +/- 0.03
v         3342         197              17.06 +/- 0.06
v        10560         295              17.79 +/- 0.08
b         5416         197              17.56 +/- 0.05
u         5211         197              16.70 +/- 0.04
uvw1      5006         197              16.86 +/- 0.06
uvm2      3477          58              17.08 +/- 0.17
uvw2      9344         777              17.88 +/- 0.05
-----------------------------------------------------

The above magnitudes are not corrected for the Galactic extinction  
corresponding to a reddening of E{B-V} = 0.07 mag (Schlegel et al. 
1998).  The photometry is on the UVOT flight system described in Poole 
et al. (2008,MNRAS,383,627).