GCN Circular 3741
Subject
GRB 050730: OHP optical observations
Date
2005-08-03T08:42:35Z (19 years ago)
From
Jean-Luc Atteia at Lab d Astrophys.,OMP,Toulouse <atteia@ast.obs-mip.fr>
Damerdji, Y. (OHP), Klotz, A. (CESR-OMP),
Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 050730
detected by SWIFT (Holland et al. GCNC 3704)
with the 0.8m (F/15) telescope
located at the Observatoire de Haute Provence
Observatory (OHP), France.
Camera is an Andor 47-40 equiped by a R band filter.
We measured the magnitudes of the afterglow
described in Holland et al. (GCNC 3704):
Tmid (julian day) Exp (s) R-Mag
2453582.35721 300 17.14 � 0.10
2453582.36875 300 17.43 � 0.09
2453582.37226 300 17.38 � 0.09
2453582.37577 300 17.31 � 0.06
2453582.37928 300 17.39 � 0.09
2453582.38279 300 17.37 � 0.11
2453582.38630 300 17.45 � 0.13
Magnituded were computed as differential with
the three nearby USNO-B1 stars:
0862-0270612 R=14.96
0862-0270590 R=15.22
0861-0264205 R=15.35
These OHP data seems to show a flattening of the decay
(or a rebrightening) starting after the second exposure.
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