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The ALEXIS Point Source Detection Effort

Published online by Cambridge University Press:  12 April 2016

Diane Roussel-Dupré ,
Jeff Bloch ,
Sean Ryan ,
Bradley Edwards ,
Timothy Pfafman ,
Keri Ramsey  and
Steve Stem
Diane Roussel-Dupré
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA
Jeff Bloch
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA
Sean Ryan
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA
Bradley Edwards
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA
Timothy Pfafman
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA
Keri Ramsey
Affiliation:
Space Data Systems Group, Los Alamos National Laboratory, P.O. Box 1663, MSD440, Los Alamos, New Mexico 87545USA
Steve Stem
Affiliation:
Astrophysics and Radiation Measurements Group, Los Alamos National Laboratory, P.O. Box 1663, MSD436, Los Alamos, New Mexico 87545USA

Abstract

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Los Alamos National Laboratory’s ALEXIS satellite (a wide area EUV monitoring instrument) was launched April 25, 1993. Due to the damage sustained at launch by the satellite, the ALEXIS project team has had to spend over a year devising new methods to determine spacecraft attitude knowledge, essential for putting photons back on the sky correctly. These efforts have been successful and currently the ALEXIS attitude solutions are precise to better than 0.5 degree close to the original 0.25 degree pre-flight specification. This paper will discuss the number and types of point sources that have been revealed in the ALEXIS data to date. We will also discuss ALEXIS observations of the June, 1994 super outburst of the Cataclysmic Variable VW Hyi, a program to look for simultaneous EUV emission from Gamma Ray Bursts, as well as an effort to detect EUV transients with a 12 – 24 hour response time.

Type
XI. Searching for New EUV Sources and Transients
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 485 - 489
Copyright
Copyright © Kluwer 1996

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