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ASAS-SN Discovery of A Probable Supernova in Mrk 0884

ATel #7256; J. Brimacombe (Coral Towers Observatory), R. A. Koff (Antelope Hills Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. G. Carballo (Observatorio Cerro del Viento MPC I84), J. M. Fernandez (Observatory Inmaculada del Molino), S. Kiyota (Variable Star Observers League in Japan), G. Krannich (Roof Observatory Kaufering), W. Wiethoff (University of Minnesota, Duluth)
on 19 Mar 2015; 21:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7284

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 new transient source, most likely a supernova, in the starburst galaxy Mrk 0884:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15fi  16:31:48.80   +20:24:38.50      2015-03-17.63    17.2 

ASASSN-15fi was discovered in images obtained on UT 2015-03-17.63 at V~17.2 mag. We also detect the object in images obtained on UT 2015-03-19.59 (V~17.0) and on UT 2015-03-15.52 (V~16.8). We do not detect (V>17.1) the object in images taken on UT 2015-03-14.58 and before. Multiple images, including an image obtained on UT 2015-03-19.77 with the LCOGT 1-m robotic telescope at Siding Springs Observatory, confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the LCOGT g-band confirmation image (right). The red lines indicate the position of the transient in the LCOGT image.

The position of ASASSN-15fi is approximately 0.3" South and 0.6" East from the center of the galaxy Mrk 0884 (z=0.017182, d=72.2 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.2 (m-M=34.29, A_V=0.156). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.