[vsnet-grb-info 10772] GRB 110721A: Preliminary Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Jul 26 00:14:00 JST 2011
TITLE: GCN CIRCULAR
NUMBER: 12194
SUBJECT: GRB 110721A: Preliminary Swift/UVOT Upper Limits
DATE: 11/07/25 15:13:56 GMT
FROM: Stephen Holland at USRA/NASA/GSFC/SSC <Stephen.T.Holland at nasa.gov>
S. T. Holland (CRESST/USRA/GSFC), and
C. A. Swenson (PSU)
report on behalf of the Swift/UVOT team:
Swift/UVOT began observations of the field of the weak X-ray source
that may be associated with GRB 110721A (Greiner et al., 2011, GCNC
12192) 54,869 s after the Fermi/GBM trigger (Tierney & von Kienlin,
2011, GCNC 12187). We do not detect the GROND optical source in the
UVOT images. Our preliminary upper limits are consistent with the
faint nature of the GROND source. The 3-sigma UVOT upper limits are
Filter T_start(s) T_stop(s) Exp(s) Upper Limit
----------------------------------------------------------
v 56,146 56,853 672 >20.8
u 54,867 55,509 632 >21.4
white 55,516 56,158 632 >22.4
----------------------------------------------------------
These upper limits are on the UVOT photometric system of Poole et al.,
2008, MNRAS, 383, 627). The upper limits are not corrected for the
Galactic extinction due to the reddening of E_{B-V} = 0.02 mag in the
direction of the burst (Schlegel et al., 1998, ApJS, 500, 525).
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