ATLAS discoveries of optical transients

ATel #9535; 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 23 Sep 2016; 16:13 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.

 
ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. MJD | Disc. Date  | Disc Mag | galactic l,b        | Notes 
ATLAS16cxl | 01:56:29.58 | +37:54:11.0 | 57652.46  | 20160921.46 |  17.28 o | 136.84396,-23.20491 |   1. 
ATLAS16cxk | 01:37:17.34 | +59:04:15.3 | 57652.48  | 20160921.48 |  17.25 o | 128.80415,-3.27705  |   2. 
ATLAS16cxm | 05:50:12.77 | +41:35:03.9 | 57652.59  | 20160921.59 |  17.46 o | 169.59480,+7.29157  |   3. 
ATLAS16cxr | 18:08:06.50 | +25:24:31.3 | 57653.25  | 20160922.25 |  17.64 o | 51.87322,+20.28757  |   4. 

1. The object is coincident with a faint source in the PS1 stack, hence probably a stellar variable.
2. In the galactic plane at b=-3.28. It appears 1.29 arcsec from a r=21.4 PS1 source, hence the object is probably stellar. Note that the PS1 source does appear to be slightly extended, but this may be a blend of two stars.
3. In the galactic plane at b=+7.29. Hence probably a stellar variable.
4. The object appears 0.8 arcsec from a r=18.8 PS1 source and is probably stellar or possibly an AGN.