[vsnet-alert 9992] 4C 09.57

[Taichi Kato]

> We discovered a quasar 4C 09.57 is an optically violently variable
> quasar in the course of the MISAO Project.

> This is our second optically violently variable quasar discovery,
> after QSO B0133+47 discovered on 2008 Feb. 8. However, we do not know
> whether the variation of this quasar was already known or not.

   This is well-known blazar (BL Lac-type) OT 081.  The same outburst
and fading has been reported to VSNET:

  YYYYMMDD(UT)   mag  observer
  20070425.997  14.12CV  (Stefan Karge)
  20070508.206  14.11CV  (Stefan Karge)
  20070516.008  14.52CV  (Stefan Karge)
  20070824.867   148  (Christopher P. Jones)
  20070831.881  14.45CV  (Diego Rodriguez)
  20070904.856   146  (Christopher P. Jones)
  20070904.906  14.40CV  (Diego Rodriguez)
  20070906.860  14.59CV  (Diego Rodriguez)
  20070912.828   148  (Christopher P. Jones)
  20070915.856   151  (Christopher P. Jones)
  20070928.819  15.02CV  (Diego Rodriguez)
  20080203.183  18.19C  (Stefan Karge)
  20080209.208  18.36C  (Stefan Karge)