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Blazar CTA 102 (4C 11.69) in very bright outburst

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發表於 2016-12-2 06:01:20 | 顯示全部樓層 |閱讀模式
AAVSO Special Notice #426

December 1, 2016

Blazar CTA 102 (4C 11.69) in very bright outburst


The blazar CTA 102 (4C 11.69) has been in an active state in
gamma-ray and optical wavelengths since 2015. During 2016, it has
had numerous flaring episodes, particularly since late October. It
is presently in an unprecedentedly bright optical state, and showing
substantially increased emission in gamma-ray and near-infrared
wavelengths.

To quote T. Balonek (Colgate University) et al. (ATel #9808): "The
blazar CTA 102 continues its amazing intra-day optical flaring
activity during a prolonged outburst, reaching the unparalleled
optical brightness of R ~ 11.85 on 2016 November 30 (UT). This is
one-and-a-half magnitudes brighter than observed during any outburst
prior to 2016 November, more than three-quarters magnitude brighter
than the blazar's previous reported brightness record on 2016
November 13 (ATel #9756), and five magnitudes brighter than the
blazar's quiescent level (around R ~ 17.0).

"On 2016 November 30 at 3 UT (JD 2457722.63), preliminary reductions
show CTA 102 at R ~ 12.05. During the next hour, the blazar
brightened by 0.2 magnitudes to R ~ 11.85 at 4 UT (JD 2457722.67)."

Observations in the AAVSO International Database (AID) from later on
November 30 (Nov. 30.72487 UT) showed CTA 102 at R = 12.673 +/-0.004,  
Nov. 30.72400 at B = 13.428 +/-0.008, and Nov. 30.72313 at V = 12.935
+/-0.005 (DUBF, F. Dubois, Zillebeke, Belgium). The most recent
observations in the AID show it on 2016 December 1.66869 UT at
magnitude V = 12.023 +/-0.020 and on Dec. 1.67044 at R = 11.712
+/-0.073 (WTHB, T. Wikander, Borlange, Sweden).

Observations in all bands are requested; visual observations are
welcomed. Changes of a few tenths of a magnitude over a period of a
few hours have been observed. Thus, CCD/DSLR observations should be
closely spaced.

Coordinates (2000.0): R.A. 22 32 36.41  Dec. +11 43 50.9

Charts: Charts with a comparison star sequence for CTA 102 may be
created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp.

Please submit observations to the AAVSO International Database
using the name CTA 102.

In addition to ATel #9808, information in this Special Notice has
been gathered from Astronomer's Telegrams #9676, 9732, 9743, 9756,
9776, 9788, 9801.


This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

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