ATLAS discoveries of optical transients

ATel #9110; 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 3 Jun 2016; 11:08 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 57542 == 03 June 2016)

 
 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. Date | Disc Mag |   z       |   Notes 
AT2016cpl | ATLAS16ayw | 09:51:54.80 | -14:36:03.6 |  57538.25  |  17.78 o | 0.03138   | 1. 
AT2016cpg | ATLAS16ayg | 10:02:19.46 | -03:12:39.7 |  57537.26  |  18.67 c |           | 2.  
AT2016cpe | ATLAS16axt | 09:28:05.19 | -08:46:23.4 |  57538.25  |  17.62 c |           | 3.  
AT2016cpv | ATLAS16azy | 10:02:12.54 | -03:10:44.4 |  57538.26  |  18.79 c |           | 4.  
AT2016cpu | ATLAS16bac | 13:01:01.35 | -01:12:38.1 |  57538.33  |  19.11 c |           | 5.  
AT2016cpi | ATLAS16ayo | 20:39:14.25 | -05:52:30.9 |  57538.57  |  18.57 c |           | 6.  
AT2016cph | ATLAS16ays | 21:16:24.19 | -00:49:43.2 |  57538.58  |  18.54 c | 0.01938   | 7.  
AT2016cpw | ATLAS16azu | 21:41:24.44 | -14:04:35.9 |  57538.60  |  17.78 c | 0.06036   | 8.  
 
 
1. 0.131 arcmin from 2MASX J09515469-1435562, v=9406 km/s. M_o = -17.9 
2. Slow rise, c=18.1 on 57541.3. Coincident with faint host galaxy r=19.6, SDSS J100219.59-031238.0 
3. Fast rise, 1 mag in 1 day. Possible high amplitude stellar variable or CV. But 20” offset from  
a diffuse, blue, faint (uncatalogued) galaxy in the Pan-STARRS1 sky stack.  
4. Rising, 0.3 mag per day. c=18.0 on 57541.3. Coincident with faint host galaxy r=19.4, SDSS J100212.57-031044.3  
5. Flat lightcurve. Coincident with faint host galaxy r=21.1, SDSS J130101.35-011237.7 
6. Offset from SDSS J203914.10-055227.8, r=22.94 faint source. Possible SN or high proper motion, variable star.  
7. 0.872 arcmin from NGC 7047, v= 5811 km/s, M_c = -16 
8. 0.126 arcmin from 2MASX J21412438-1404429, v=18096 km/s, M_c =-19.3