[vsnet-grb-info 4077] GRB061202: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5888
SUBJECT: GRB061202: Swift/UVOT Upper Limits
DATE:    06/12/02 17:06:00 GMT
FROM:    Frank Marshall at GSFC  <marshall at milkyway.gsfc.nasa.gov>

F.E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team:
 
The Swift/UVOT began its first finding chart exposure of the field of  
GRB 061202 129 seconds after the BAT trigger (Sakamoto et al., GCN Circ. 5886).
No afterglow candidate is detected in the XRT error circle reported by 
Sakamoto et al. in this or any of the other early UVOT exposures.
 
The initial photometry upper limits for each UVOT filter are given 
below where Tmid is the average time of the exposure, in seconds,
since the BAT trigger and Mag_3 is the 3-sigma
upper limit for the magnitude. The quoted errors do not 
include the 0.1 mag systematic uncertainty in the photometric zero points.
 
   Filter    Tmid    Exposure  Mag_3
              (s)     (s)
==========================================
   White      179      98       20.4
              911      98       20.4

   V          434     393       20.1

   B         5054     197       20.7

   U         4850     197       20.3

   UVW1      4645     197       20.1

   UVM2      4440     197       20.1

   UVW2      5464     197       20.5

==========================================
 
The values quoted above are not corrected for the expected Galactic
extinction of E_{B-V} = 0.15 mag (Schlegel et al. 1998).