[vsnet-grb-info 8068] GRB 090702: UVOT upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9607
SUBJECT: GRB 090702: UVOT upper limits
DATE:    09/07/03 11:13:55 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (MSSL-UCL) and D. M. Palmer (LANL) report on behalf of the  
Swift/UVOT team:

The Swift/UVOT began observing the field of INTEGRAL GRB 090702,  
3.5hrs after the
INTEGRAL trigger (Paizis et al., GCN 9603). We do not detect any  
source at the
Swift XRT position (Sbarufatti et al. GCN 9604).

The 3-sigma upper limits for the finding chart exposure is:

Filter   T_start(s)   T_stop(s)   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
white      14080       20350        971     > 22.72
v          14646       20964       1126     > 21.20
b          13516       25451       1753     > 22.37
u          12951       24855       1796     > 21.89
-------------------------------------------------------------

The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.039 mag.
All photometry is on the UVOT photometric system described in Poole et
al. (2008, MNRAS, 383, 627).