ATLAS discoveries of optical transients

ATel #8839; 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 18 Mar 2016; 13:26 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 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 57465 == 18 March 2016 ). We consider them all to be probable supernovae.

 
 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. Date | Disc Mag |   z      | Notes 
AT2016bev | ATLAS16ago | 07:47:50.21 | -18:44:12.8 |  57457.33  |  17.78 c | 0.010797 | 1.  
AT2016bex | ATLAS16ahf | 07:19:27.39 | +47:32:19.8 |  57458.33  |  17.43 c | 	      | 2.  
AT2016bey | ATLAS16ahj | 11:37:40.23 | +57:04:41.5 |  57458.43  |  18.43 c | 0.073036 | 3.  
AT2016bez | ATLAS16ahd | 14:56:34.08 | +57:00:47.4 |  57448.57  |  18.55 c | 0.078078 | 4.  
AT2016bfa | ATLAS16agw | 14:58:01.09 | +63:27:30.7 |  57449.56  |  18.87 c | 0.046632 | 5.  
AT2016bfb | ATLAS16agy | 16:33:57.93 | +46:16:56.0 |  57449.59  |  18.57 c | 0.030526 | 6.  
AT2016bfc | ATLAS16agv | 16:41:09.71 | +50:58:20.9 |  57458.59  |  18.26 c |          | 7.  
AT2016bfd | ATLAS16ahb | 18:02:55.28 | +69:15:29.7 |  57458.62  |  17.95 c |          | 8.  
 
 
1. 51 arcsec from ESO 560-G013 at d=40 Mpc. M_c = -16.4 at discovery. Has risen to m=17.0 
2. No catalogued host galaxy, nothing visible in Pan-STARRS1 grizy 3Pi stack. Has faded to m=18.0 
3. Nuclear transient coincident with core of early type galaxy 2MASX J11374023+5704420, d=303 Mpc. M_c=-19.  
4. 4.7 arcsec from SDSS J145634.48+570044.0 at d=323 Mpc. M_c = -19.1 
5. 2.9 arcsec from 2MASX J14580123+6327336 at d=195 Mpc. M_c = -17.6 
6. 8.9 arcsec from SDSS J163357.26+461701.6 at d=131 Mpc, M_c = 17.1  
7. Very faint, likely host galaxy, detected in Pan-STARRS1 i-band stack, i~23. Rising, now m=17.5.  
8. 5.9 arcsec from likely host galaxy 2MASX J18025452+6915258, no redshift.