GCN Circular 9581
Subject
GRB 090625B: Swift/UVOT Upper Limits
Event
Date
2009-06-26T16:56:21Z (16 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
S. T. Holland (CRESST/GSFC/USRA) and J. Mao (INAF-OAB)
report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 090625B starting 3679 s
after the INTEGRAL/IBAS detection (Gotz, et al., 2009, GCN
Circ. 9572). We do not find any new source, relative to the DSS,
USNO-B1.0, or 2MASS at the position of the XRT afterglow (Mao, et
al. 2009, GCN Circ. 9573). Preliminary 3-sigma upper limits for
detecting a source in the co-added images are
Filter T_start T_stop Exp(s) Mag
--------------------------------------------
v 3679 5007 318 >20.0
b 4192 11,398 413 >20.8
u 3987 67,218 6439 >21.7
uvw1 5218 17,045 1781 >21.5
uvm2 5012 16,139 1082 >21.0
uvw2 4602 4802 197 >20.1
white 3828 4596 344 >21.8
--------------------------------------------
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} = 0.02 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).