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ASAS-SN Discovery of A Probable Supernova in MCG-01-60-044

ATel #6404; K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, A. B. Davis, B. J. Shappee, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 19 Aug 2014; 17:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae, Transient

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from both the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii and the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, towards the galaxy MCG-01-60-044:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  
ASASSN-14fw  23:49:06.723   -07:02:56.59     2014-08-18.47    16.9 
ASASSN-14fw was discovered in "Brutus" images obtained on UT 2014-08-18.47 at V=16.8. It is also present in "Brutus" images taken on UT 2014-08-17.57 at V=17.0, and significantly brighter on UT 2014-08-15.40 at V=16.4 (these images were taken under bright Moon conditions). It might also be present, significantly fainter and subject to further analysis, in "Cassius" images obtained between UT 2014-08-03.35 and 2014-08-10.17. It was not present in "Brutus" images taken on UT 2014-07-27.57 (V>17.5). Images obtained on UT 2014-08-18.94 with the LCOGT 1-m telescope at SAAO confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host galaxy (left) and the LCOGT g-band confirmation image (right). The red arrow pointing at the transient position has a length of 10".

The position of ASASSN-14fw is approximately 2" (projected distance 1 kpc) from the center of star-forming galaxy MCG -01-60-044 (z=0.027169, d=109 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.5 (m-M=35.19, A_V=0.08). 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.