[vsnet-grb-info 2201] GRB 050922C: break in the lightcurve

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4040
SUBJECT: GRB 050922C: break in the lightcurve
DATE:    05/09/26 20:13:40 GMT
FROM:    Brian Lindgren Jensen at U.of Copenhagen  <brian_j at astro.ku.dk>

Johan P. U. Fynbo, Brian L. Jensen, Páll Jakobsson,
Jens Hjorth, Jesper Sollerman, José María Castro Cerón
(DARK, NBI), Karianne Holhjem (NOT, La Palma), Ricardo Salinas
(Universidad de Concepción, Chile) report:

We have obtained further imaging of the afterglow of GRB 050922C
(GCN 4011, 4012, 4013) using the ALFOSC at the Nordic Optical
Telescope on La Palma and DFOSC at the Danish 1.5m telescope at La
Silla, Chile. We find that the early decay slope of about 1 (GCN 4012)
extends to less than a day post burst, after which the decay slope
steepens to about alpha=1.7+-0.3. Further observations are planned.
A preliminary lightcurve can be seen at:

http://www.astro.ku.dk/~brian_j/grb/grb050922.830/