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[vsnet-grb-info 472] GRB 021004: Optical measurement at OHP
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 1615
SUBJECT: GRB 021004: Optical measurement at OHP
DATE: 02/10/10 07:32:26 GMT
FROM: Michel Boer at CESR-CNRS <Michel.Boer@cesr.fr>
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A. Klotz and M. Boer CESR/CNRS (Toulouse, France), and W. Thuillot
IMCCE/BDL Paris, France report the following data on GRB 021004 obtained
with the 1.20 meter telescope at the OHP/CNRS (Observatoire de Haute
Provence - France).
Images were R-cousin filtered. Each measurement image results of
co-addition of 4 frames of 40s (dark and flat corrected). Magnitudes are
computed compared to the USNO star at 00:26:58.713 +18:56:56.61 (Fox et
al. GCN 1564) assuming R=15.64.
Magnitudes of GRB021004 : (R band)
2002 oct. 04 22:04:44.5 UT (JD=2452552.41996) : 18.29
2002 oct. 04 22:12:01.7 UT (JD=2452552.42502) : 18.37
2002 oct. 04 22:20:32.3 UT (JD=2452552.43093) : 18.40
2002 oct. 04 23:51:04.3 UT (JD=2452552.49380) : 18.67
2002 oct. 04 23:57:13.2 UT (JD=2452552.49807) : 18.65
Dates are middle of exposures. This data fill nicely a gap around T0 +
0.4 when the decay index of the light curve increases.
.
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<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>A.
Klotz and M. Boer CESR/CNRS (</span></font><span =
lang=3DEN-GB>Toulouse</span><span
lang=3DEN-GB>, </span><span lang=3DEN-GB>France</span><span =
lang=3DEN-GB>), and W.
Thuillot IMCCE/BDL Paris, France report the following data on GRB 021004
obtained with the 1.20 meter telescope at the OHP/CNRS (Observatoire de =
Haute
Provence - France).</span></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Images
were R-cousin filtered. Each measurement image results of co-addition of =
4
frames of 40s (dark and flat corrected). Magnitudes are computed =
compared to
the USNO star at 00:26:58.713 +18:56:56.61 (Fox et al. GCN 1564) =
assuming
R=3D15.64.</span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Magnitudes
of GRB021004 : (R band) </span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>2002
oct. 04 22:04:44.5 UT (JD=3D2452552.41996) : 18.29<br>
2002 oct. 04 22:12:01.7 UT (JD=3D2452552.42502) : 18.37<br>
2002 oct. 04 22:20:32.3 UT (JD=3D2452552.43093) : 18.40<br>
2002 oct. 04 23:51:04.3 UT (JD=3D2452552.49380) : 18.67<br>
2002 oct. 04 23:57:13.2 UT (JD=3D2452552.49807) : =
18.65</span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>Dates
are middle of exposures. This data fill nicely a gap around T0 + 0.4 =
when the
decay index of the light curve increases.</span></font></p>
<p><font size=3D3 face=3D"Times New Roman"><span lang=3DEN-GB =
style=3D'font-size:12.0pt'>.
</span></font></p>
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lang=3DEN-GB
style=3D'font-size:12.0pt'> </span></font></p>
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lang=3DEN-GB
style=3D'font-size:12.0pt'> </span></font></p>
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