[vsnet-grb-info 4317] GRB 070219: ROTSE-III Optical Limits

Mon Feb 19 11:33:43 JST 2007

TITLE:   GCN CIRCULAR
NUMBER:  6106
SUBJECT: GRB 070219: ROTSE-III Optical Limits 
DATE:    07/02/19 02:33:38 GMT
FROM:    Heather Swan at U.of Michigan/ROTSE  <hflewell at umich.edu>

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H. Swan (U Mich), J. Aretakis (U Mich) report on behalf of the ROTSE  
collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB  
070219 (Swift trigger 261132), producing images beginning 35 minutes  
after the GCN notice time. An automated response took the first image  
at 01:44:52.6 UT, 2076.5 s after the burst, under twilight  
conditions. We took 10 5-sec, 10 20-sec and 6 60-sec eposures. These  
unfiltered images are calibrated relative to USNO A2.0 (R).

Comparison to the DSS (second epoch) reveals no new sources within  
the 3-sigma error circle, for both single images and coadding into  
sets of 10. Individual images have limiting magnitudes ranging from  
15.8-17.0; we set the following specific limits.

start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
01:44:52.6 01:45:52.6 60 16.4 2076.5 N
02:13:52.6 02:14:52.6 60 17.0 3816.5 N
01:51:50.6 02:03:17.4 686 17.8 2494.5 Y

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16.0px 0.0px"><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
16px;">H. Swan (U Mich), J. Aretakis (U Mich) report on behalf of the =
ROTSE collaboration: </SPAN></FONT><FONT class=3D"Apple-style-span" =
face=3D"Times" size=3D"4"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 16px;"><BR></SPAN></FONT><FONT =
class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 16px;"> ROTSE-IIIb, =
located at McDonald Observatory, Texas, responded to GRB 070219 (Swift =
trigger 261132), producing images beginning 35 minutes after the GCN =
notice time. An automated response took the first image at 01:44:52.6 =
UT, 2076.5 s after the burst, under twilight conditions. We took 10 =
5-sec, 10 20-sec and 6 60-sec eposures. These unfiltered images are =
calibrated relative to USNO A2.0 (R).</SPAN></FONT><FONT =
class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: =
16px;"><BR></SPAN></FONT><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
16px;"><BR></SPAN></FONT><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: 16px;"> =
Comparison to the DSS (second epoch) reveals no new sources within the =
3-sigma error circle, for both single images and coadding into sets of =
10. Individual images have limiting magnitudes ranging from 15.8-17.0; =
we set the following specific limits.</SPAN></FONT><FONT =
class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: =
16px;"><BR></SPAN></FONT><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
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size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: 16px;"> =
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?</SPAN></FONT><FONT =
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--------------------------------------------------------------------</SPAN=
></FONT><FONT class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
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16px;"><BR></SPAN></FONT><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: 16px;"> =
01:44:52.6 01:45:52.6 60 16.4 2076.5 N</SPAN></FONT><FONT =
class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
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16px;"><BR></SPAN></FONT><FONT class=3D"Apple-style-span" face=3D"Times" =
size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: 16px;"> =
02:13:52.6 02:14:52.6 60 17.0 3816.5 N</SPAN></FONT><FONT =
class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
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size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: 16px;"> =
01:51:50.6 02:03:17.4 686 17.8 2494.5 Y</SPAN></FONT></P><P =
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0.0px; font: 16.0px Times; min-height: 19.0px"><BR =
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