[vsnet-grb-info 4907] GRB 070714B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6632
SUBJECT: GRB 070714B: Swift/UVOT Upper Limits
DATE:    07/07/16 19:59:10 GMT
FROM:    Wayne Landsman at GSFC/SSAI  <landsman at milkyway.gsfc.nasa.gov>

W. Landsman (NASA/GSFC) and J. Racusin (PSU) report on behalf of the 
Swift/UVOT team:

The Swift/UVOT observed the field of GRB 070714B starting 70 s after the 
BAT trigger (Racusin et al. GCN Circ.6620).   We do not find any source, 
in any of the UVOT observations, inside the refined XRT error circle 
(Racusin et al., GCN Circ. 6627), or at the location of the Liverpool 
source (Melandri et al., GCN Circ. 6621).

The 3-sigma upper limits for detecting a source inside the refined XRT 
error circle are:

Filter    T_start     T_end    Exp(s)    Mag (3-sigma upper limit)

White      70         170        98.2      > 20.4
v         177         577       393.4      > 19.6
b         657        1637        58.1      > 19.2
u         632        1766        89.2      > 19.2
uvw1      607        1750        97.3      > 19.1
uvw2      687        1676        77.8      > 19.2

The values quoted above are not corrected for the expected Galactic 
extinction
corresponding to a reddening of E_{B-V} = 0.14 mag in the direction of the
burst (Schlegel et al. 1998).