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GCN Circular 6689

Subject

Swift/UVOT detection of GRB070714B

Date

2007-07-30T21:17:07Z (17 years ago)

From

Wayne Landsman at GSFC/SSAI <landsman@milkyway.gsfc.nasa.gov>

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

The Swift/UVOT observed the field of the short-hard burst GRB 070714B 
starting 70 s after the  BAT trigger (Racusin et al. GCN Circ. 
6620Not found
 
 
).     Upper limits on individual exposures were reported by 
Landsman & Racusin (GCN Circ. 6632Not found
 
 
).    We now  combine all data 
obtained within the first 7350s and find detections in the white (4.5 
sigma) and v (3.3  sigma) filters at the position of the source first 
reported by Melandri et al. (GCN Circ. 6621Not found
 
 
).     The source is detected 
in each of the three UV filters at the ~2.9 sigma level.   Presuming the 
detection in the UVW2 (2100 A) filter is real, an upper limit of ~1.3 
can be set on the redshift.


Filter    Tstart  Tstop     Exp       Mag
            (s)    (s)      (s) 
White       70    7143      628      20.95 � 0.23

v          177    6117     1435      20.36 � 0.32
          7355   87569     4321     >20.9 (3 sigma)

uvw1       607    6528      294      20.14 � 0.38
         11649   99315     9741     >22.1 (3 sigma)

uvm2       583    6321      294      20.02 � 0.37
         10742   98409     8750     >22.3 (3 sigma)

uvw2       687    7350      471      20.55 � 0.37
         16463  104208     5313     >22.1 (3 sigma)