[vsnet-grb-info 9374] GRB 100615A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10856
SUBJECT: GRB 100615A: Swift/UVOT Upper Limits
DATE:    10/06/15 19:21:44 GMT
FROM:    Stephen Holland at USRA/NASA/GSFC/SSC  <Stephen.T.Holland at nasa.gov>

S. T. Holland (CRESST/GSFC/USRA) and
V. D'Elia (ASDC)
report on the behalf of the Swift UVOT team:

      The Swift/UVOT observed the field of GRB 100615A starting 53 s
after the BAT trigger (D'Elia, et al., 2010, GCN Circ. 10841).
Settled observations started at 72 s.  We do not find any new source,
relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT
afterglow (Goad, et al. 2010, GCN Circ. 10848).  Preliminary 3-sigma
upper limits for detecting a source in the finding charts, and in the
co-added images, using a 2.5 arcsecond radius circular aperture, are

Filter    T_start   T_stop   Exp(s)      Mag
--------------------------------------------
white (fc)     72      222      147    >21.5
              864     1014      147    >21.5
u (fc)        284      534      246    >20.7

v             613     7037      510    >20.6
b             539     6422      490    >21.1
u             284     6216      539    >21.1
uvw1          663     7436      499    >21.1
uvm2          813     7242      413    >20.7
uvw2          589     6832      471    >21.1
white          72     6627      785    >22.2
--------------------------------------------

The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a
reddening of E_{B-V} = 0.05 mag (Schlegel, et al., 1998, ApJS, 500,
525).  All photometry is on the UVOT photometry system described in
Poole et al. (2008, MNRAS, 383, 627).