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GCN Circular 8827

Subject

GRB090118 Swift/UVOT upper limits

Date

2009-01-19T11:47:20Z (16 years ago)

From

Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>

P. Schady (MSSL-UCL) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began white-band observations of the field of the  
likely GRB candidate detected in the BAT Slew Survey (BATSS), GRB  
090118 (Copete et al., GCN 8825Not found
 
 
) at 2009-01-018 20:55:35 UT, 25.3 ks  
after the burst. We do not detect any new source within the Swift BAT  
error circle (Copete et al., GCN 8825Not found
 
 
) in a co-added white-band image  
down to the following 5-sigma upper limit:

Filter    T_start  T_stop  Exp         Mag
                (ks)       (ks)       (s)    (5-sigma upper limit)
-------------------------------------------------------------
white       25.3    35.3    1292     > 21.1
-------------------------------------------------------------

The quoted upper limits have not been corrected for the expected  
Galactic extinction along the line of sight of E_(B-V) = 0.13 mag. All  
photometry is on the UVOT photometric system described in Poole et al.  
(2008, MNRAS, 383, 627).