ASAS-SN Discovery of A Probable Supernova in Mrk 842

ATel #6318; K. Z. Stanek (Ohio State), I. Cruz (Cruz Observatory), C. S. Kochanek, A. B. Davis, T. W.-S. Holoien, B. J. Shappee, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Universidad Diego Portales), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 16 Jul 2014; 19:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a likely supernova in galaxy Mrk 842

 
Object        RA (J2000)    DEC (J2000)      Disc. UT Date   Disc. V mag  
ASASSN-14dz   15:05:54.522 +12:44:43.33      2014-07-13.31    15.7 

ASASSN-14dz was discovered in Brutus images taken on UT 2014-07-13.31 at V~15.6 mag. It was also detected on UT 2014-07-11.3 at V~15.7 and marginally detected at V~15.9 in poor quality images obtained on UT 2014-07-09.3. We do not detect (V>17.5) the object in images taken on 2014 UT 2014-06-26.3 and before. Image obtained by I. Cruz on UT 2014-07-16.1 with the Planewave CDK-17 43-cm telescope (+Apogee CG16M camera) located near Reynoldsburg, Ohio, confirms the detection of the transient. This figure shows the ASAS-SN V-band reference image (top-left), the archival DSS image of the host (top-right), ASAS-SN V-band discovery difference image (bottom-left) and the Cruz Observatory confirmation image (bottom-right). The red circle has a radius of 5" and is centered on the ASAS-SN position of the transient.

The position of ASASSN-14dz is approximately 7" (projected 2.9 kpc) from the center of galaxy Mrk 842 (z=0.022202, luminosity distance d=95.3 Mpc, via NED), giving the transient an absolute V-band magnitude of approximately -19.4 (m-M=34.9, A_V=0.10). Follow-up observations are encouraged. We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.