[vsnet-grb-info 7825] GRB 090515: Swift/UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9369
SUBJECT: GRB 090515: Swift/UVOT Observations
DATE:    09/05/15 20:10:18 GMT
FROM:    Michael Siegal at Swift/PSU  <siegel at astro.psu.edu>

M. H. Siegel (PSU) and A. P. Beardmore (Leicester) report on behalf
of the Swift/UVOT team.

The Swift/UVOT began observing the field of GRB 090515 67s after
the BAT trigger (Beardmore et al., GCN Circ. 9356).  Data summed
from the first and second orbits does not reveal a source at the
refined position of the X-ray afterglow (Osborne et al., GCN Circ.
9367).

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       67        216        146       > 20.35
white          67       2389        488       > 21.24
white        5901      13321        401       > 21.12

v             608       2439        213       > 19.27
v            6311       7947        393       > 19.62

b             534       2365        194       > 20.15
b            5696      13291        688       > 20.70

u             278        528        245       > 19.83
u            6926      12386        491       > 20.40

uvw1          657       2488        214       > 19.83
uvw1         6722       8290        327       > 20.01

uvm2          805       2291         97       > 19.07
uvm2         6516       8151        393       > 20.16

uvw2          583       2414        213       > 20.11
uvw2         6107       7742        393       > 20.48
=================================================================

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.02 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).