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Special Notice #389: Possible Supernova in NGC 4303 (M61) - PSN J12215757+0428185 [SN 2014dt]

October 29, 2014: The CBAT Transient Object Confirmation Page (follow-up page = reports the discovery of a possible supernova in M61 (NGC 4303) [SN 2014dt] by Koichi Itagaki (Yamagata, Japan) on 2014 Oct. 29.8376 UT at magnitude 13.6 CCD unfiltered.

Coordinates:  R.A. 12 21 57.57   Dec. +04 28 18.5   (2000.0)

This object has been submitted to VSX and assigned the name PSN J12215757+0428185. Once it is approved, charts may be plotted using the AAVSO Variable Star Plotter (

At this moment there is no AAVSO sequence, but one will be made available as soon as possible.

Itagaki's discovery image is at

Confirmation of this object is needed. Please save your images so they may be reduced to the AAVSO sequence once it is available.

Once this object has been added to VSX and an AUID assigned, observations may be submitted to the AAVSO International Database using the name PSN J12215757+0428185. Please be sure to indicate what comparison stars you used.

Many thanks, and good observing.

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


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