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GCN Circular 10310

GRB 100103A: Swift/UVOT Upper Limits
2010-01-03T23:57:10Z (14 years ago)
Margaret Chester at PSU <>
M. M. Chester (PSU), M. H. Siegel (PSU), S. Immler (NASA/CRESST/GSFC),  
and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift/UVOT  

The Swift/UVOT began observing the INTEGRAL-detected GRB 100103A  
(D.Gotz, et al., GCN Circ. 10307) at 18:36UT on January 3rd, 2010,  
approximately 54 mins after the INTEGRAL detection.  No optical  
afterglow consistent with the Swift/XRT candidate (J. Kennea, et al.,  
GCN Circ. 10308) is detected in the UVOT exposures.  Preliminary 3- 
sigma upper limits using the UVOT photometric system (Poole et al.  
2008, MNRAS, 383, 627) are:

Filter    T_start(s)   T_stop(s)   Exp(s)      Mag
v         3244         4409        1165       >20.44
u         4418         5554        1136       >20.70

The values quoted above are not corrected for the Galactic extinction  
due to the reddening of E(B-V) = 0.29 in the direction of the XRT  
candidate (Schlegel et al. 1998).
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