GCN Circular 2752
Subject
GRB040924, RTT150 optical observation
Date
2004-09-26T21:01:40Z (20 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I. Khamitov, Z. Aslan (TUG), C. Yesilyaprak (Akdeniz Univ.),
U. Kiziloglu (METU), E.Gogus, A. Alpar (Sabanci Univ.),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Bikmaev, N. Sakhibullin (KSU)
report:
We observed the afterglow of GRB 040924 (Fenimore et al. GCN 2735, Fox
and Moon, GCN 2734) with Russian-Turkish 1.5-m telescope (Bakyrlytepe,
TUBITAK National Observatory, Turkey). We made 33x300s images in R between
Sep. 25, 23:45 UT, and Sep. 26, 2:45 UT. The observations were hampered by
the bright-moon and bad seeing (1.7 arcsec). The object was clearly
detected near the limit of the combined image. We estimate its magnitude
to be m_R=23.7+/-0.2.
This magnitude is consistent with power law decay with index -1.16,
obtained in our previous observations (GCN 2749). The KAIT earlier
measurements (GCN 2748) seem to be consistent with this power law as well.
Therefore, to the first approximation, the whole light curve of the GRB
040924 afterglow can be described as a single power law with index -1.16.
The combined light curve can be found at:
http://hea.iki.rssi.ru/~rodion/040924/lc_all.jpg
or
http://www.tug.tubitak.gov.tr/~irekk/grb/grb040924/lc_all.jpeg
The finding charts:
http://hea.iki.rssi.ru/~rodion/040924/fcharts.html
or
http://www.tug.tubitak.gov.tr/~irekk/grb/grb040924/fcharts.html
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