Re: 0235+16 radio/optical flare

[Berrie Giebels <berrie@poly.in2p3.fr>]

At z=0.94 we probably will not have to alert the VHE observatories..


On Thu, 25 Jan 2007, Matthias Kadler wrote:

> Hi everybody,
>
> one of "our" sources is right now having a very bright mm radio flare:
>
> http://sma1.sma.hawaii.edu/callist.html?plot=0238%2B166
>
> Claudia Raiteri from the WEBT told me that the optical state is also very 
> high and very variable. On Sunday and Monday, Swift will observe the source 
> for 10ksec each with the XRT and the four bluest filters of the UVOT. I have 
> already asked Claudia to spread this among the WEBT partners but I wanted to 
> let you know, as well. If anybody has suggestions for further complementary 
> observations, please let me know.
>
> This source is a BL Lac object that is famous for various reasons: EGRET 
> source, possible microlensing candidate, correlated multi-wavelength 
> variability, extremely compact structure almost unresolved even at 
> microarcsec resolution, extreme short-term radio variability indicating a 
> Doppler factor of ~100, possible 5.7yr periodicity between main outbursts and 
> last but not least it has become famous for skipping its latest predicted 
> outburst in spring 2004.
>
> It is probably too early to say if this is now the delayed major outburst or 
> if this flare gets stuck somewhere in the medium-amplitude mm regime. The 
> latest data point from Jan 23 is already a bit lower than the ones from Jan 
> 11/12. But for many years, this is certainly the most exciting event in this 
> object.
>
> Matthias
>
> -- 
> Dr. Matthias Kadler
> NASA Postdoctoral Research Associate
> Astrophysics Science Division
> Code 662
> NASA's Goddard Space Flight Center Greenbelt, MD 20771
> tel: 301-286-4390
> fax: 301-286-1684
> e-mail: mkadler@milkyway.gsfc.nasa.gov
>

- Berrie