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GCN Circular 3726

Subject

GRB 050801: ROTSE-III Early Afterglow Break

Date

2005-08-01T19:50:15Z (19 years ago)

From

Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>

E.S. Rykoff (U Mich), S.A. Yost (U Mich), W. Rujopakarn (U Mich), H. 
Swan (U Mich), K. Alatalo (Berkeley), R. Quimby (U Texas) report on 
behalf of the ROTSE collaboration:

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, is 
observing the optical counterpart to GRB 050801 (Swift trigger 148522, 
Band et al, GCN 3725Not found
 
 
).  The early afterglow reported in GCN 3723Not found
 
 
 is 
characterized by a broken power-law, which does not decay significantly 
from t+21s to t+200s, followed by a decline with a power law index of 
~-1.1.  Our preliminary photometry, relative to the USNO A2.0 catalog, 
also shows some possible sub-structure to the lightcurve.

tstart-tburst  exptime        mag
---------------------------------
  21.8          5.0        14.99+/-0.06
  203.0         20.0       15.01+/-0.03
  1590.3        60.0       17.29+/-0.15