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Discovery of ATLAS16dvr (==AT2016iae) in NGC1532: a probably young and nearby supernova

ATel #9749; J. Tonry, L. Denneau, B. Stalder, A. Heinze, A. Sherstyuk (IfA, University of Hawaii), A. Rest (STScI), K. W. Smith, S. J. Smartt (Queen's University Belfast)
on 12 Nov 2016; 09:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ken Smith (k.w.smith@qub.ac.uk)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9754

We report the following bright transient found by the ATLAS survey (see Tonry et al. ATel #8680). ATLAS is a twin 0.5m telescope system on Haleakala and Mauna Loa. The first unit is operational on Haleakala and is robotically surveying the sky. Two filters are used, cyan and orange (denoted c and o, all mags in AB system), more information is on http://www.fallingstar.com. The transient has been registered with the IAU as AT2016iae.

ATLAS16dvr is 45 arcsec from the centre of NGC1532, with a spectroscopic z=0.003468 (from NED). The distance is uncertain but in the range 13 to 20 Mpc (kinematic and Tully Fisher respectively). With A_c=0.043, the absolute magnitude at this first detection was between M_c =-13.5 and -14.5. There was no detection by ATLAS 8 days before this discovery date. On MJD 57703 (2016-11-11) the object had brightened to o=15.53, indicating a rise of approximately 0.5mag per day. Immediate spectroscopic followup is encouraged. NGC1532 previously hosted SN1981A.

Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. MJD | Disc. Date  | Disc Mag |    z     |  
AT2016iae | ATLAS16dvr | 04:12:05.52 | -32:51:44.7 | 57699.47  | 20161107.47 |  17.24 c | 0.003468 |