[vsnet-alert 9991] Re: Discovery of another optically violently variable quasar 4C 09.57

[Stefan Karge]

Dear Seiichi Yoshida,

the 2007 outburst of OVV Quasar OT081 = PKS 1749+096 = 4C 09.57
was already published by me, S. Karge, via vsnet-alert 9356 
in 2007, titled <Blazar PKS 1749+096 in outburst>,
posted on Wed May 16 22:03:33 JST 2007. 

I independently discovered the outburst on the 25th of April,
2007 at Taunus Observatory:
25-Apr-2007, 23h55 UT:  14.12 CV (0.02), 24" (2x20sec)
08-May-2007, 04h56 UT:  14.11 CV (0.03), 14" (1x100sec)
16-May-2007, 00h13 UT:  14.52 CV (0.02), 24" (2x20sec)

A lightcurve throughout the observing season 2007, together with
data on the history of the discovery, were also published at:
Karge, S., 2007, The Astronomer, Vol. 44, No 520, 100.
	 
My last observation of OT 081 dates back to 09-Feb-2008 and 
showed the QSO near minimum brightness of 18.36C 
(see vsnet-campaign-blazar 363).


Best regards

Stefan Karge 
_______________


-------- Original-Nachricht --------
> Datum: Sun, 23 Mar 2008 21:24:32 +0900 (JST)
> Von: Seiichi Yoshida <comet at aerith.net>
> An: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, cvnet-outburst at yahoogroups.com
> Betreff: [vsnet-alert 9989] Re: Discovery of another optically violently	variable quasar 4C 09.57

> Dear colleagues,
> 
> > The SIMBAD shows that this quasar was reported in the
> > (Fiorucci+Tosti+Rizzi, 1998) paper. It was recorded as 11.95 mag(V) as
> > [FTR98] 1749+096 C1, but other records show it around 14.5 mag(V). So
> > maybe an outburst was recorded in their observations.
> 
> Oops, [FTR98] 1749+096 C1 is not the quasar, but a near by background
> star. The (Fiorucci+Tosti+Rizzi, 1998) paper just lists up comparison
> stars around blazars. Sorry...
> 
> I have not researched many X-ray or radio papers of this quasar. But
> so far, nobody else have been reported the optical outburst of this
> quasar before.
> 
> The optical violent outburst of this quasar has been recorded only
> twice in the history, our observations (and also recorded in the
> ASAS-3 data) in 2007, and the single infrared DSS plate in 1995 as we
> reported.
> 
> Best regards,
> 
> --
> Seiichi Yoshida
> comet at aerith.net
> http://www.aerith.net/








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