Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 9495

GRB 090607: Swift/UVOT Upper Limits
2009-06-07T16:42:02Z (15 years ago)
Peter Curran at MSSL <>
P.A. Curran (UCL-MSSL) and F. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 090607
75 s after the BAT trigger (Marshall et al., GCN Circ. 9491). No optical 
afterglow consistent with the XRT position (Marshall et al., GCN Circ. 
9491) is detected in the initial UVOT exposures. Preliminary 3-sigma 
upper limits using the UVOT photometric system (Poole et al. 2008, 
MNRAS, 383, 627) for the first finding chart (FC) exposure and 
subsequent exposures are:

Filter         T_start(s)  T_stop(s)   Exp(s)       Mag

uvw1           12715       13943       1209         >20.8
u              75          1233        1140         >21.2
v              11448       12707       1239         >20.4

The values quoted above are not corrected for the Galactic extinction 
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
Looking for U.S. government information and services? Visit