GCN Circular 6213
Subject
GRB 070318: Swift/UVOT Continued Observations
Event
Date
2007-03-18T17:09:46Z (19 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and J.R. Cummings (NASA/UMBC) report
on behalf of the Swift team:
The bright optical afterglow of GRB 070318 (Cummings et al., GCN Circ. 6210)
is following an approximately power-law decay. At 13,000 sec. after the
trigger, the magnitude in the UVOT B filter is ~19.9 with a best-fit
decay index of 1.16. If this rate of decay continues, the B magnitude
will be 22.3 at one day after the trigger and 23.2 a day later.
The afterglow has been detected in all 7 UVOT filters indicating that
the redshift is less than ~2.
Observations with ground-based telescopes are encouraged.