The analysis of the recently downlinked ALEXIS data is complete. The transient reported below appears to have peaked in EUV flux at 4:00UT Feb 10, and then began to decline. The source appears to have disappeared by 12UT Feb 10. Optical properties of such an transient are unknown. For example if it is a previously unknown Cataclysmic Variable, it may still be bright for a few more hours in the optical. Thanks to all who responded to this alert. Jeff On Sat, 10 Feb 1996, Jeff Bloch wrote: > > ALEXIS has detected an EUV transient in its 1B telescope (172 Angstroms, > 71 eV). There is no detection of the source in the co-aligned 1A > telescope (130 Angstroms, 93 eV). > > Position: RA,DEC = 13 59 27.6, +53 54 40.3 (J2000 Coordinates) > 90% Error Circle Radius = 0.5 degrees > > Due to an operational problem, there is no ALEXIS data for 12 hours prior to > 23H UT Feb 9. The source was already bright at 0H UT Feb 10, and continued to > be active through 06:30H UT Feb 10. The next data dump from ALEXIS will occur > around 20UT Feb 10. I will post more information after that time as it > becomes available. > > Groundbased observations made at this time will aid in the identification > of the optical counterpart. > > For more information, see the ALEXIS web page > > http://nis-www.lanl.gov/~asocops/ > > > Jeff Bloch > > -------------------------------------------------------------------------- > Jeffrey Bloch Office: (505) 665-2568 > Astrophysics and Radiation Measurements Group ALEXIS SOC:(505) 665-5975 > Los Alamos National Laboratory FAX: (505) 665-4414 > Group NIS-2, Mail Stop D436 e-mail: jbloch@lanl.gov > Los Alamos, NM 87545 pager: 104-8074 > -------------------------------------------------------------------------- > > > > -------------------------------------------------------------------------- Jeffrey Bloch Office: (505) 665-2568 Astrophysics and Radiation Measurements Group ALEXIS SOC:(505) 665-5975 Los Alamos National Laboratory FAX: (505) 665-4414 Group NIS-2, Mail Stop D436 e-mail: jbloch@lanl.gov Los Alamos, NM 87545 pager: 104-8074 --------------------------------------------------------------------------