[vsnet-grb-info 6249] GRB080613B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7877
SUBJECT: GRB080613B: Swift/UVOT Upper Limits 
DATE:    08/06/13 22:13:41 GMT
FROM:    Wayne Landsman at GSFC/SSAI  <wayne.b.landsman at nasa.gov>

W.Landsman (GSFC/Adnet) and C. Markwardt (CRESST/GSFC/UMD) , on behalf 
of the Swift/UVOT team.

The Swift Ultra-Violet/Optical Telescope (UVOT) began settled 
observations of GRB 080613B (trigger 313954) 79 seconds after the BAT 
trigger (Markwardt et al.,GCN Circ. 7873).  No afterglow is detected at 
the enhanced XRT position (Mao et al., GCN Circ.7875) in the initial 
white finding chart or subsequent summed images. The limiting 
magnitudes  (3-sigma in 5" radius apertures) in each of the UVOT filters 
are as follows:

Filter  T_start(s)  T_stop(s)  Exp(s)  Mag UL (3sig)

white       79       180        98     >20.4
white       79      7227       627     >21.4
v          185      7566      1167     >20.1
b          665      7023       451     >20.5
u          640     13348       312     >20.1
uvw1       616     13323      1179     >20.8
uvm2       591     12415      1102     >21.2
uvw2       695     18103       936     >21.0

The values quoted above are in the UVOT photometric system (Poole et al. 
2008, MNRAS, 383, 627).  They are not corrected for the expected 
Galactic extinction corresponding to a reddening of E(B-V)=0.04 mag in 
the direction of the burst (Schlegel et al. 1998).