[AAVSO-HEN] GRB 090516: Swift/UVOT Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9377
SUBJECT: GRB 090516: Swift/UVOT Observations
DATE:    09/05/16 18:45:43 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at 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).