GCN Circular 820
Subject
GRB000926 : increasing optical decay slope
Date
2000-09-30T00:47:57Z (24 years ago)
From
Johan U. Fynbo at ESO,Garching <jfynbo@eso.org>
J. P. U. Fynbo, P. Moller (ESO), J. Gorosabel (DSRI, Copenhagen),
J. Hjorth, B. L. Jensen, and H. Pedersen (U. of Copenhagen),
report on behalf of a larger European GRB Collaboration:
"Using the ALFOSC on the 2.5m Nordic Optical Telescope, we have
obtained further R-band imaging of the Optical Transient (OT) of
GRB 000926 (GCN #801, #803, #804) on 2000 September
29.84-29.95 UT.
We find the following R-band magnitudes of the OT using the
reference star of Halpern et al. (GCN #806) :
UT R-band 1sigma
-----------------------------
29.8414 21.779 0.042
29.9478 21.890 0.082
An updated lightcurve including the NOT measurements (black circles)
and the measurements of Halpern et al. (GCN #806), Price et al. (#811)
and Veillet (GCN ~818) (open diamonds) can be seen at
www.obs.aau.dk/~jfynbo/grb/grb000926/lightcurve.gif. The new NOT
measurements fall below the extrapolation of the power-law decline
found at earlier epochs. We conclude therefore that the decay slope
of the afterglow is increasing.