ASASSN-16ic: Discovery of A Probable Supernova in GALEXASC J011415.49-162456.4

ATel #9336; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, J. Shields, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 7 Aug 2016; 17:45 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.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 "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy GALEXASC J011415.49-162456.4.

ASASSN-16ic (AT 2016eqw) was discovered in images obtained on UT 2016-08-06.22 at V~16.8 mag. We also detect the object in images obtained on UT 2016-08-07.21 (V~17.1), UT 2016-08-05.23 (V~16.9), UT 2016-08-04.29 (V~16.8), UT 2016-08-03.26 (V~17.0), UT 2016-08-02.39 (V~17.0), and UT 2016-07-30.58 (V~17.4). We do not detect (V>17.1) the object in images taken on UT 2016-07-26.62 and before. This figure shows the archival DSS image of the host (left), the ASAS-SN V-band reference image of the host (center), and the ASAS-SN V-band discovery image (right). The red circle has a radius of 10" and is centered on the position of the transient in the ASAS-SN image.

The position of ASASSN-16ic is approximately 0.9" South and 0.7" West from the center of the galaxy GALEXASC J011415.49-162456.4, which has no redshift available in NED. Properties of the new source and photometry are summarized in the tables below:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-16ic  01:14:15.54   -16:24:57.60     2016-08-06.22      16.8          N/A               1.14 

 
Obs. UT Date         V mag 
2016-07-26.62        >17.1 
2016-07-30.58         17.4 
2016-08-02.39         17.0 
2016-08-03.26         17.0 
2016-08-04.29         16.8 
2016-08-05.23         16.9 
2016-08-06.22         16.8 
2016-08-07.21         17.1 

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-16xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-16xx (AT2016xyz) to preserve, rather than anonymize, the origin of the transient.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.