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SN 2016gkg - Unusual Type-II Supernova in NGC 613 (Scl)

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發表於 2016-9-23 06:24:20 | 顯示全部樓層 |閱讀模式
[size=13.3333px]AAVSO Special Notice #421

[size=13.3333px]September 22, 2016
[size=13.3333px]SN 2016gkg - Unusual Type-II Supernova in NGC 613 (Scl)


[size=13.3333px]SN 2016gkg (announced as AT2016gkg) was discovered by Victor Buso
[size=13.3333px](Rosario, Argentina) on 2016 September 20.2484 UT at CCD magnitude
[size=13.3333px](clear filter) 17.6 +/-0.5, rising to 14.5 +/-0.02 on Sep. 21.1398.
[size=13.3333px]His discovery was reported to the Transient Name Server by
[size=13.3333px]Sebastian Otero (Buenos Aires, Argentina). It was confirmed by
[size=13.3333px]ASAS-SN on Sep. 21.29 UT (B. Nicholls (Mt. Vernon Obs., New
[size=13.3333px]Zealand) et al., ATel #9521) and by ATLAS on Sep. 20.54 UT (J.
[size=13.3333px]Tonry (IfA, University of Hawaii) et al., ATel #9526).

[size=13.3333px]SN 2016gkg was spectroscopically confirmed as a Type-II supernova
[size=13.3333px]by S. W. Jha (Rutgers), V. van Wyk, and P. Vaisanen (SALT/SAAO)
[size=13.3333px]from observations made on 2016 September 21.9 UT (ATel #9528).

[size=13.3333px]Its optical behavior has been very unusual, with more than a
[size=13.3333px]magnitude decline in 24-48 hours, which is highly atypical for
[size=13.3333px]a Type-II supernova. It is for this reason that observations are
[size=13.3333px]requested as the supernova evolves. The most recent magnitude
[size=13.3333px]available is 15.73 V +/- 0.05 on 2016 Sep. 22.3 UT, using ASAS-SN
[size=13.3333px]data (Ping Che (KIAA-PKU) et al., ATel #9529).

[size=13.3333px]V observations are requested; other bands may be added as time and
[size=13.3333px]inclination permit. As this supernova appears to be changing so
[size=13.3333px]quickly, multiple observations per night would be valuable.

[size=13.3333px]Coordinates for SN 2016gkg: R.A. 01 34 14.40  Dec. -29 26 24.2 (2000.0)
[size=13.3333px]This position is 78.4" South and 49.1" West of the center of NGC
[size=13.3333px]613 (ATel #9521).

[size=13.3333px]Charts with comparison stars for SN 2016gkg may be created using
[size=13.3333px]the AAVSO Variable Star Plotter (VSP,[size=13.3333px]http://www.aavso.org/vsp[size=13.3333px]).
[size=13.3333px]Observers may find choosing the 'display DSS chart' when creating
[size=13.3333px]their charts very helpful, as the DSS image of the galaxy will be
[size=13.3333px]supraimposed on the star positions and magnitude labels. Also, be
[size=13.3333px]sure to tick the boxes requesting Rc and Ic comparison stars in
[size=13.3333px]addition to the V and B-V which are supplied by default.

[size=13.3333px]Please report observations to the AAVSO International Database
[size=13.3333px]using the name SN 2016gkg.

[size=13.3333px]ATel links:
[size=13.3333px]ATel #9521 - [size=13.3333px]http://www.astronomerstelegram.org/?read=9521
[size=13.3333px]ATel #9526 - [size=13.3333px]http://www.astronomerstelegram.org/?read=9526
[size=13.3333px]ATel #9528 - [size=13.3333px]http://www.astronomerstelegram.org/?read=9528
[size=13.3333px]ATel #9529 - [size=13.3333px]http://www.astronomerstelegram.org/?read=9529

[size=13.3333px]Congratulations to Victor on his discovery!


[size=13.3333px]This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

[size=13.3333px]----------------------------------
[size=13.3333px]SUBMIT OBSERVATIONS TO THE AAVSO

[size=13.3333px]Information on submitting observations to the AAVSO may be found at:
[size=13.3333px]https://www.aavso.org/webobs

[size=13.3333px]SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

[size=13.3333px]A Special Notice archive is available at the following URL:
[size=13.3333px]https://www.aavso.org/special-notice-archive

[size=13.3333px]Subscribing and Unsubscribing may be done at the following URL:
[size=13.3333px]https://www.aavso.org/observation-notification#specialnotices

[size=13.3333px]-------------------------------------------------
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