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[vsnet-alert 322] ALEXIS EUV Transient ALERT Followup




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
--------------------------------------------------------------------------

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