GCN Circular 6041
Subject
GRB 070125: UVOT Detection in Ultraviolet Filters
Date
2007-01-26T22:04:19Z (17 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC), D. E. vanden Berk (PSU), and
J. Racusin (PSU) report on behalf of the Swift team:
The afterglow of GRB 070125 (Hurley et al., GCN Circ. 6024)
has now been detected in all 6 UVOT filters ranging from
V (central wavelength of 546 nm) to UWW2
(central wavelength of 193 nm).
The decay in the V filter is consistent
with a 1/t decay rate. Detection in the UVW2
filter requires a redshift of < 1.5, which
is consistent with earlier suggestions by
Prochaska et al. (GCN 6031 and 6032) and
Pelangeon and Atteia (GCN 6033).
The table below gives the measured magnitudes.
T_start and T_end are the start and stop
times of the summed exposures in seconds from the trigger.
No correction has been made for the expected
Galactic reddening of E(B-V) = 0.05.
Filter T_start T_end Exposure Mag Error
V 46685 53261 1736 18.54 0.06
V 58269 63986 1590 18.74 0.07
V 116966 117176 205 19.26 0.27
B 47550 54163 1674 18.92 0.03
B 59126 59947 798 19.03 0.06
UVW2 116119 116959 840 19.26 0.10