GCN Circular 7877
Subject
GRB080613B: Swift/UVOT Upper Limits
Date
2008-06-13T22:13:41Z (16 years ago)
From
Wayne Landsman at GSFC/SSAI <wayne.b.landsman@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).