[vsnet-alert 13365] Re: [vsnet-campaign-blazar 498] (ATEL) BL Lac active

[Stefan Karge]

Outburst of BL Lac (see ATel #3371)

object        date, UTC       mag      comment  
--------------------------------------------------
BL Lac       20110411.444    15.20V
BL Lac       20110417.476    15.19V
BL Lac       20110507.448    14.48V
BL Lac       20110517.426    14.78V
BL Lac       20110524.408    14.27V    active
BL Lac       20110528.354    13.63V    outburst
--------------------------------------------------

Stefan Karge
Frankfurt/M., Germany
E-mail  s.karge at gmx.net

35cm-MNT + CCD + V-Bessell
Tzec Maun Observatory
Photometric V-mag sequence (AAVSO)
_____________________________________________________




-------- Original-Nachricht --------
> Datum: Tue, 24 May 2011 09:25:04 +0900
> Von: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
> An: variable_star_forum at yahoogroups.com, vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, vsnet-alert at yahoogroups.com, vsnet-campaign-blazar at ooruri.kusastro.kyoto-u.ac.jp
> Betreff: [vsnet-campaign-blazar 498] (ATEL) BL Lac active

>   (ATEL) BL Lac is reported to be active.
> 
> Recent visual observations:
> 
>   YYYYMMDD(UT)   mag  observer
>   20110311.508  14.53V  (Stefan Karge)
>   20110330.100  <143  (Pavol A. Dubovsky)
>   20110404.087   150: (Pavol A. Dubovsky)
>   20110411.085   153  (Pavol A. Dubovsky)
>   20110505.025   148  (Pavol A. Dubovsky)
>   20110506.012   147  (Pavol A. Dubovsky)
>   20110512.035   147  (Pavol A. Dubovsky)
>   20110513.069   146  (Klaus Wenzel)
> 
> ==============================================================================
> ATEL #3371							     ATEL #3371
> 
> Title:	Fast optical brightening of BL Lacertae
> Author:	V. M. Larionov, E.G.Larionova and N.V.Efimova (Astronomical
> 		Institute, St.-Petersburg State University, Russia, and Pulkovo
> Observatory,
> 		Russia), M. Villata and C. M. Raiteri (INAF, Osservatorio Astronomico
> 		di Torino, Italy), for the GASP Collaboration
> Queries:	raiteri at oato.inaf.it
> Posted:	23 May 2011; 08:50 UT
> Subjects:Optical, AGN, Blazar
> 
> With reference to ATel #3368, announcing the Fermi LAT detection of
> increasing
> gamma-ray activity of BL Lacertae, we report on its optical brightening.
> 
> Observations in St. Petersburg reveal R = 13.87 +/- 0.01 on May 14.99,
> R = 13.06 +/- 0.01 on May 21.95 and R = 12.71 +/- 0.01 on May 22.97, with
> a brightness increase of 0.36 mag in 24.5 hours. 
> These brightness levels are comparable to those reached during the
> outbursts
> of 1997-2004. 
> 
> ------------------------------------------------------------------------------
> Password Certification: Claudia M. Raiteri (raiteri at oato.inaf.it)
> http://www.astronomerstelegram.org/?read=3371
> ==============================================================================

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