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ASAS-SN Discovery of A Probable Supernova in (Yet Another) Dwarf Galaxy UGC 11860

ATel #6301; K. Z. Stanek (Ohio State), J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, B. J. Shappee, A. B. Davis, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Universidad Diego Portales), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 8 Jul 2014; 21:19 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 6304

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 dwarf galaxy UGC 11860

Object        RA (J2000)    DEC (J2000)      Disc. UT Date   Disc. V mag  
ASASSN-14dq   21:57:59.97   +24:16:08.1      2014-07-08.48     15.7 
ASASSN-14dq was discovered in multiple images obtained 2014 UT July 08.48 at V~15.7 mag. We do not detect (V>17.4) the object in images taken on 2014 UT June 27.49 and before. Images obtained by J. Brimacombe on UT July 08.76 with the RCOS 41-cm telescope near Siding Spring Observatory confirm 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 RCOS 41-cm confirmation image (bottom-right). The red circle has a radius of 5" and is centered on the RCOS 41-cm position of the transient.

The position of ASASSN-14dq is approximately 9" (projected 1.6 kpc) from the center of the dwarf galaxy UGC 11860 (z=0.010424, luminosity distance d=38.5 Mpc, via NED), giving the transient an absolute V-band magnitude of approximately -17.4 (m-M=32.92, A_V=0.19). 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.