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ASASSN-16hd: Discovery of A Probable Supernova in GALEXASC J015051.89+223348.8

ATel #9227; J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, 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, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 8 Jul 2016; 20:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9253

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 GALEXASC J015051.89+223348.8.

ASASSN-16hd (AT 2016czq) was discovered in images obtained on UT 2016-07-08.59 at V~16.8 mag. We also detect the object in images obtained on UT 2016-07-05.61 (V~16.6). We do not detect (V>17.1) the object in images taken on UT 2016-06-23.51 and before. This figure shows the archival SDSS image of the host (left), the ASAS-SN V-band reference image (middle) and the ASAS-SN subtraction image (right). The red circle has a radius of 20" and is centered on the position of the transient in the subtraction image.

The position of ASASSN-16hd is approximately 11.6" North and 2.5" West from the center of the galaxy GALEXASC J015051.89+223348.8 (no redshift information available from 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-16hd  01:50:51.709   +22:34:00.49     2016-07-08.59      16.8            N/A               11.87 
 
Obs. UT Date         V mag 
2016-06-23.51        >17.1 
2016-07-05.61         16.6 
2016-07-08.59         16.8 

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.