ATLAS discoveries of optical transients

ATel #9651; 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 19 Oct 2016; 13:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ken Smith (k.w.smith@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.

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.

 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. MJD | Disc. Date  | Disc Mag |    z     | Notes 
AT2016hff | ATLAS16dkq | 19:25:51.18 | -31:21:16.5 | 57667.26  | 20161006.26 |  17.38 c |          |   1. 
AT2016hfh | ATLAS16dlb | 19:21:21.14 | +47:14:27.2 | 57668.27  | 20161007.27 |  18.07 c |          |   2. 
AT2016hfc | ATLAS16dkf | 00:20:11.44 | +47:28:56.4 | 57668.39  | 20161007.39 |  18.33 c |          |   3. 
AT2016gzs | ATLAS16dic | 07:52:43.19 | +58:41:38.0 | 57668.58  | 20161007.58 |  17.39 c |          |   4. 
AT2016hgd | ATLAS16dmf | 09:59:07.46 | +50:59:05.6 | 57674.63  | 20161013.63 |  17.74 o | 0.025544 |   5. 
AT2016hfe | ATLAS16dkv | 20:06:45.56 | -31:00:44.2 | 57675.24  | 20161014.24 |  17.44 o | 0.039661 |   6. 
AT2016hgb | ATLAS16dlz | 00:43:36.60 | +41:56:32.1 | 57677.52  | 20161016.52 |  17.67 o |          |   7. 

1. No obvious host.
2. NED reports that the likely host (2.22 arcsec away) is 2MASX J19212135+4714264
3. NED reports that the likely host (16.2 arcsec away) is 2MASX J00201167+4728401
4. NED reports that the likely host (4.02 arcsec away) is 2MASX J07524342+5841346
5. NED reports that the likely host (18.66 arcsec away) is UGC 05356, with spectroscopic z=0.025544, hence mu=35.20, A_o=0.032, M_o=-17.49
6. NED reports that the likely host (7.55 arcsec away) is ESO 461- G 040, with spectroscopic z=0.039661, hence mu=36.09, A_o=0.326, M_o=-18.98
7. This object is a probable M31 nova.