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Special Notice #337: Bright transient near the galaxy NGC 5643 (Lupus) [SN 2013aa]

February 15, 2013: As noted by Alexandre Amorim in the AAVSO Forums, a bright transient [SN 2013aa] has appeared in the fringes of the face-on spiral galaxy NGC 5643, and has been published on the Transient Objects Confirmation Page at Harvard. (See for more information.)  Rod Stubbings has since provided confirmation of the transient, estimating it at m(vis)=11.9 on 2013 Feb 15.514 UT (JD 2456339.014); we are not yet aware of spectroscopy that enables classification as a supernova or any other source.  This object has been added to VSX with the temporary designation PSN J14323388-4413278 . Observations of this object are encouraged to determine its nature and follow the outburst.

Both visual and CCD observations are encouraged, as is spectroscopy; spectroscopy could enable classification of this object, and should also be reported to CBAT (see for details).

The object is located at the following (J2000) coordinates:

        RA: 14 32 33.88 , Dec: -44 13 27.8

A sequence for the field has been created by Mati Morel, and is available through AAVSO's Variable Star Plotter (

If this object is confirmed as a supernova, we will issue an Alert Notice within 1-2 days.

Please promptly submit all observations to the AAVSO International Database via WebObs using the name "PSN J14323388-4413278".

This AAVSO Special Notice was prepared by M. Templeton.



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