ATLAS discoveries of optical transients

ATel #9492; 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 Sep 2016; 11:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ken Smith (k.w.smith@qub.ac.uk)

Tweet

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 candidate supernovae 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 
AT2016geo | ATLAS16cro | 16:14:27.44 | +25:41:37.1 | 57637.25  | 20160906.25 |  18.53 c | 0.063800 |   1. 
AT2016gen | ATLAS16crl | 16:51:56.85 | +25:55:26.6 | 57637.28  | 20160906.28 |  17.93 c | 0.035572 |   2. 
AT2016gep | ATLAS16crp | 18:07:29.93 | +26:06:02.9 | 57637.31  | 20160906.31 |  18.46 c |          |   3. 
   -      | ATLAS16crq | 18:25:29.87 | -09:47:32.3 | 57639.25  | 20160908.25 |  14.19 c |          |   4. 

1. NED reports that the likely host (15.9 arcsec away) is 2MASX J16142856+2541384, with spectroscopic redshift z=0.063800, hence mu=37.2, A_c=0.15, M_c=-18.89 (forced, using 1st 5sigma detection).
2. NED reports that the likely host (4.26 arcsec away) is 2MASX J16515657+2555237, with spectroscopic redshift z=0.035572, hence mu=35.89, A_c=0.213, M_c=-18.22 (forced, using 1st 5sigma detection).
3. The object is coincident with a faint object in the PS1 stack.
4. The object is in the galactic plane (b=1.23) and is almost certainly a high amplitude galactic variable. Inspection of the PS1 stack shows no object at the location of the transient.