[vsnet-grb-info 4228] GRB070125 redshift request

Fri Jan 26 10:57:15 JST 2007

TITLE:   GCN CIRCULAR
NUMBER:  6026
SUBJECT: GRB070125 redshift request
DATE:    07/01/26 01:57:09 GMT
FROM:    Brenda L. Dingus at LANL  <dingus at lanl.gov>

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Brenda Dingus reports for the Milagro Collaboration

GRB070125 occured at 9.5 degrees zenith for the Milagro TeV observatory. =
This burst is the brightest that has occured within the optimum field of =
view of Milagro.  Very preliminary analysis doesn't show any significant =
excess.  The interpretation of this observation depends on the redshift =
of the burst,  because very high energy emission is absorbed for bursts =
at high redshifts due to pair production with the extragalactic =
background light.

We encourage observers to try to obtain a redshift for this GRB which =
would then result in the most stringent constraints on the ratio of very =
high energy emission to sub-MeV emission from GRBs.

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<DIV><FONT face=3DArial size=3D2>Brenda Dingus reports&nbsp;for the =
Milagro=20
Collaboration</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>GRB070125 occured at 9.5 degrees zenith for the =
Milagro=20
TeV observatory. This burst is the brightest that has occured within the =
optimum=20
field of view of Milagro.&nbsp; Very preliminary analysis doesn't show =
any=20
significant excess.&nbsp; The interpretation of this observation depends =
on the=20
redshift of the burst,&nbsp; because very high energy emission is =
absorbed for=20
bursts at high redshifts due to pair production with the extragalactic=20
background light.<BR><BR>We encourage observers to try to obtain a =
redshift for=20
this GRB which would then&nbsp;result in&nbsp;the most stringent =
constraints on=20
the ratio of very high energy emission to sub-MeV emission from=20
GRBs.<BR></FONT></DIV></BODY></HTML>

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