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Special Notice #296: Outburst of the BL Lac object 4C 11.69 == CTA 102

October 6, 2012:  The BL Lac object 4C 11.69 (== CTA 102) was discovered in bright outburst by V. Larionov, D. Blinov, and S. Jorstad (St. Petersburg University and Boston University) on 2012 September 18, reaching a magnitude of R=14.67; see ATel #4397 (http://www.astronomerstelegram.org/?read=4397).  Those authors also claim a coincident substantial increase in the gamma ray flux as observed by the Fermi LAT instrument.  As of 2012 September 19.8799, they found the source was still brighter than R=15.1 but fading rapidly.   Observations of this interesting source are encouraged over the next several days.  The object has been around m(vis) = 16.5 for the past few hundred days; the most recent AAVSO observation was m(vis)=16.4 on 2012 August 17.005 (JD 2456156.505) by Adolfo Darriba Martinez (Spain).

4C 11.69 is located at the following J2000 coordinates:

RA: 22 32 36.41 , Dec: +11 43 50.9

A new sequence expanding upon previously released comparisons from the GTN project has been prepared by Tim Crawford of the AAVSO Sequence team and is available via VSP:

http://www.aavso.org/vsp

Please use the name "4C 11.69" when submitting observations to the AAVSO.

This AAVSO Special Notice was prepared by M. Templeton.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484