ATLAS discoveries of optical transients : 6 supernova candidates

ATel #9131; 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 9 Jun 2016; 13:11 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 57548 == 09 June 2016). Spectroscopic observations are encouraged.

 
 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. Date | Disc Mag |   z     |  Notes 
AT2016csr | ATLAS16bcm | 15:14:31.03 | +06:41:14.2 |  57543.40  |  18.69 c |         | 1. rising 
AT2016csk | ATLAS16bcb | 17:09:30.31 | +21:36:29.7 |  57542.43  |  18.61 c | 0.048703| 2. rising 
AT2016csl | ATLAS16bce | 16:51:01.67 | +24:48:48.5 |  57542.42  |  18.87 c | 0.054514| 3. rising 
AT2016csi | ATLAS16bcd | 16:33:49.46 | +33:19:43.0 |  57542.41  |  18.67 c | 0.031782| 4. rising  
AT2016csj | ATLAS16bcg | 13:40:23.58 | +25:08:50.8 |  57542.34  |  18.59 c |         | 5.  
AT2016csg | ATLAS16bbx | 17:14:13.13 | +41:33:42.4 |  57541.42  |  18.82 c |         | 6.  
 
1. 11 arcsec from host galaxy SDSS J151431.52+064123.9. m_c = 18.13 on 57547.3 
2. 6.6 arcsec from 2MASX J17093078+2136344. M = -18.3 at discovery,  m_c = 17.9 on 57546.3 
3. 2.8 arcsec from core of 2MASX J16510150+2448459. M = -18.2 at discovery, m_c = 18.2 on 57546.5 
4. 3.2 arcsec from core of KUGX 1631+334. M = -17.2 at discovery. m_c = 17.8 on 57546.4 
5. 4.1 arcsec from host galaxy SDSS J134023.58+250854.9. Flat lightcurve. m_c = 18.6 on 57546.3  
6. 10.4 arcsec from host galaxy SDSS J171414.01+413345.6. Flat lightcurve, m_c=18.8 on 57545.4