GCN Circular 8469
Subject
GRB 081102: Swift/UVOT refined analysis
Date
2008-11-03T15:13:14Z (16 years ago)
From
Stefan Immler at NASA/GSFC <stefan.m.immler@nasa.gov>
S. Immler (GSFC/CRESST/UMCP) and T. N. Ukwatta (GSFC/GWU) report on the
behalf of the Swift UVOT team:
The Swift Ultra-Violet/Optical Telescope (UVOT) began observing GRB
081102 (trigger 333427) 83 seconds after the BAT trigger (Ukwatta et
al., GCN Circ. 8462). No afterglow is detected at the enhanced XRT
position (Osborne et al., GCN Circ. 8467) in the initial v-filter
finding chart or subsequent images. The limiting magnitudes (3-sigma in
3" radius apertures) in each of the UVOT filters are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig)
white 100 19051 1246 >21.9
v 83 35803 1423 >20.3
b 433 24833 1808 >21.3
u 408 30614 2717 >21.3
uvw1 383 29977 2922 >21.1
uvm2 359 36395 2701 >20.9
uvw2 309 34890 1434 >20.7
The values quoted above are in the UVOT photometric system (Poole et al.
2008, MNRAS, 383, 627). They are not corrected for the high (and
unreliable) Galactic extinction at the low Galactic latitude of the
burst of <5 degrees.