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[vsnet-grb-info 471] GRB 021004: Optical observations, AUDE network
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 1614
SUBJECT: GRB 021004: Optical observations, AUDE network
DATE: 02/10/10 07:16:20 GMT
FROM: Michel Boer at CESR-CNRS <Michel.Boer@cesr.fr>
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A. Klotz and M. Boer, CESR/CNRS (Centre d'Etude Spatiale des
Rayonnements, Toulouse, France) report measurements obtained by members
of the AUDE network (Association des Utilisateurs de Detecteurs
Electroniques). As images were not filtered, the authors computed the
magnitudes in reference to the R band system which is expected to be the
most reliable for unfiltered CCD images.
Magnitudes of GRB 021004 :
2002 oct. 5, 01h04 UT : R=18.8 by R. Poncy (1)
2002 oct. 5, 22h30 UT : R=19.70 +/- 0.1 (referenced to USNO) by P.
Martinez & P.M. Berger (2)
(1) Diam. 254 mm
Integ. 30 x 60 sec.
Location : Le Cres, France (IAU station 177)
(2) Diam. 820 mm
Integ. 23 x 60 sec.
Location : ADAGIO observatory, Belesta, France (IAU station A05)
Note also a detection of the optical counterpart at 2002 oct. 5, 21h30
UT, by A. Klotz using a telescope of only 200 mm diameter. Low signal to
noise did not allow to measure the magnitude, but the limiting magnitude
of the image is about 20.5 (addition of 60 frames of 60 sec). This
demonstrates that small telescopes can detect the afterglow of a GRB
even 1.4 days after the GRB event.
Images are available at the following URL:
http://www.cesr.fr/~klotz/grb021004/aude.html
These data are coherent with already reported magnitude in other
circulars, and fill some gaps in the light curve.
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<p><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'>A. Klotz
and M. Boer, CESR/CNRS (Centre d'Etude Spatiale des Rayonnements, =
Toulouse,
France) report measurements obtained by members of the AUDE network
(Association des Utilisateurs de Detecteurs Electroniques). =
</span></font><span
lang=3DEN-GB>As images were not filtered, the authors computed the =
magnitudes in
reference to the R band system which is expected to be the most reliable =
for
unfiltered CCD images. </span></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Magnitudes
of GRB 021004 : </span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>2002
oct. 5, 01h04 UT : R=3D18.8 by R. Poncy (1) <br>
2002 oct. 5, 22h30 UT : R=3D19.70 +/- 0.1 (referenced to USNO) by P. =
Martinez
& P.M. Berger (2) </span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>(1)
Diam. 254 mm <br>
Integ. 30 x 60 sec. <br>
</span>Location : Le Cres, France (IAU station =
177)</font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>(2)
Diam. 820 mm <br>
Integ. 23 x 60 sec. <br>
Location : ADAGIO observatory, </span></font><span
lang=3DEN-GB>Belesta</span><span lang=3DEN-GB>, </span><span =
lang=3DEN-GB>France</span><span
lang=3DEN-GB> (IAU station A05) </span></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Note
also a detection of the optical counterpart at 2002 oct. 5, 21h30 UT, by =
A.
Klotz using a telescope of only 200 mm diameter. Low signal to noise did =
not
allow to measure the magnitude, but the limiting magnitude of the image =
is
about 20.5 (addition of 60 frames of 60 sec). This demonstrates that =
small
telescopes can detect the afterglow of a GRB even 1.4 days after the GRB =
event.</span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Images
are available at the following URL: =
http://www.cesr.fr/~klotz/grb021004/aude.html</span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
lang=3DEN-GB
style=3D'font-size:12.0pt'>These data are coherent with already reported
magnitude in other circulars, and fill some gaps in the light =
curve.</span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:
10.0pt;font-family:Arial'> </span></font></p>
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style=3D'font-size:
12.0pt'> </span></font></p>
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style=3D'font-size:
12.0pt'> </span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> </span></font></p>
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