[vsnet-grb-info 7007] Swift Trigger 335971: Swift/UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8591
SUBJECT: Swift Trigger 335971: Swift/UVOT Observations
DATE:    08/12/01 23:06:09 GMT
FROM:    Frank Marshall at GSFC  <marshall at milkyway.gsfc.nasa.gov>

F.E. Marshall (NASA/GSFC) and J. Mao (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT observed the field of Swift trigger 335971 
on Nov. 29, 2008, starting 141 s after 
the BAT trigger (Mao et al., GCN Circ. 8582).
Ground analysis of the BAT data indicates that this trigger
was probably not due to a real source (Cummings and Mao, 
GCN Circ. 8583). No new source is seen inside the BAT
error circle (Cummings and Mao, GCN Circ. 8583) in
any of the individual or summed UVOT exposures.

The 3-sigma upper limits in the UVOT photometric system 
(Poole et al. 2008, MNRAS, 383, 627) are:

Filter          T_start(s)   T_stop(s)      Exp(s)       Mag 

white              141          291          147        >20.6
v                  376          742           58        >18.6
b                  474          840           58        >19.5
u                  450          815           58        >19.4
uvw1               425          790           58        >19.0
uvm2               401          766           58        >18.8
uvw2               351          717           58        >19.0

The values quoted above are not corrected for the Galactic extinction due
to the reddening of E(B-V) = 0.10 in the direction of the burst 
(Schlegel et al. 1998).