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ASAS-SN Discovery of A Probable Supernova in NGC 5536

ATel #7370; T. W.-S. Holoien (Ohio State), Subo Dong (KIAA-PKU), 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), P. R. Wozniak (LANL), E. Falco (CfA), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 11 Apr 2015; 16:32 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 #: 7405

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 galaxy NGC 5536:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15gw  14:16:23.97   +39:30:09.02      2015-04-10.54    16.5 

ASASSN-15gw was discovered in images obtained on UT 2015-04-10.54 at V~16.5 mag. We do not detect (V>16.6) the object in images taken on UT 2015-04-08.410 and before. An image obtained on UT 2015-04-11.29 with the LCOGT 1-m robotic telescope at McDonald Observatory confirms 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-15gw is approximately 1.1" North and 1.3" East from the center of the starforming galaxy NGC 5536 (z=0.019507, d=83.7 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.1 (m-M=34.61, A_V=0.03). 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.