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GCN Circular 6194

Subject

GRB 070311: Swift/UVOT Upper Limits

Date

2007-03-11T14:59:18Z (17 years ago)

From

Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>

S. T. Holland (CRESST/USRA/GSFC) reports on behalf of the Swift UVOT
team:

      Swift/UVOT observed the field of GRB 070311 (Mereghetti, et
al. 2007, GCN Circ. 6189Not found
 
 
) starting 7004 s after the INTEGRAL/IBAS
trigger.  UVOT did not detect any source at the location of the
infrared afterglow (Covino, et al. 2007, GCN Circ. 6190Not found
 
 
), relative to
the DSS, down to the following 3 sigma upper limits.

Filter  t_start(s)  t_stop(s)  Exp(s)  Mag 3-sig UL

     V      7618       7818      197        19.5
     B      7004       7203      197        20.5
     U      8232       8432      197        20.1
   UVW1     8027       8227      197        20.0
   UVM2     7822       8022      197        20.0
   UVW2     7414       7613      197        20.3

These upper limits are not corrected for the Galactic extinction,
corresponding to a reddening of E_{B-V} = 0.76 mag (Schlegel et
al. 1998), in the direction of this burst.