GCN Circular 9377
Subject
GRB 090516: Swift/UVOT Observations
Date
2009-05-16T18:45:43Z (15 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU) and B. A. Rowlinson (Leicester) report on behalf
of the Swift/UVOT team.
The Swift/UVOT began observing the field of GRB 090516 171s after
the BAT trigger (Beardmore et al., GCN Circ. 9374). Data summed
from the first and second orbits does not reveal a source at the
refined position of the X-ray afterglow (Beardmore et al., GCN Circ.
9376).
The 3-sigma upper limits for the finding chart (fc) and
summed exposures are reported below:
FILTER T_start(s) T_stop Exposure Mag/3UL
=============================================================
white fc 171 321 147 > 20.85
white 3843 5478 393 > 21.06
v 4254 5890 393 > 19.63
b 585 601 15 > 18.74
b 5073 5273 196 > 20.32
u 329 579 245 > 20.12
u 4868 6384 274 > 20.20
uvw1 4664 6301 393 > 20.36
uvm2 4458 6096 393 > 20.18
uvw2 4049 5685 393 > 20.41
=================================================================
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.05 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).