ATLAS discoveries of optical transients : 4 supernova candidates

ATel #9145; 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 13 Jun 2016; 14:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stephen Smartt (s.smartt@qub.ac.uk)

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We report the following transients 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. All transients have been registered with the IAU TNS.

Host galaxy identifications and redshifts are from NED or the Pan-STARRS1 3Pi image stack, and absolute magnitude calculations include an estimate of Milky Way foreground extinction at the filter wavelength. (For reference MJD 57552 == 13 June 2016). Spectroscopic observations are encouraged.

 
 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. Date | Disc Mag |   z      | Notes 
AT2016csu | ATLAS16bek | 13:40:31.71 | +55:35:35.6 |  57535.35  |  18.03 o | 0.036665 |1.     
AT2016cst | ATLAS16bem | 15:36:44.91 | +48:17:43.8 |  57541.42  |  19.00 c | 0.075233 |2.     
AT2016csv | ATLAS16bel | 16:48:09.17 | +46:05:24.1 |  57545.40  |  18.42 c |          |3.  
AT2016cvj | ATLAS16beo | 16:32:59.21 | +31:57:43.2 |  57546.42  |  19.01 c |          |4.  
 
 
1. 8 arcsec from 2MASX J13403142+5535431. At 156Mpc, (mu=35.97) this was discovered at 
M_o = -18.0. It has since brightened to m_c = 17.6 on 57549.4.  
2. 7.7 arcsec from 2MASX J15364453+4817382. At 314Mpc, (mu=37.48), this was discovered at 
M_c = -18.5. Lightcurve is flat (latest point m_c = 19.0 on 57549.4) 
3. Coincident with a diffuse host, 5-10” in diameter in SDSS. SDSS J164809.12+460524.2 
is the closest catalogued object in DR12, but the resolved and amorphous  
galaxy is catalogued as 5 distinct objects. Rising lightcurve. m_c = 18.0 on 57549.4  
4. 1.5 arcsec from centre of edge on host galaxy SDSS J163259.09+315743.4.  
Rising, m_c = 18.5 on 57550.4