AstroNote 2019-104

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DRAFT
2019-10-17 09:14:06
Type: Object/s-Discovery/Classification
ATLAS19ygo (AT2019sox): discovery of a candidate supernova in NGC 7081 (41 Mpc)
Authors: M. Fulton, K. W. Smith, S. J. Smartt, S. Srivastav, O. McBrien, J. Gillanders (Queen's University Belfast), T.-W. Chen (MPE), L. Denneau, H. Flewelling, A. Heinze, J. Tonry, H. Weiland (IfA, University of Hawaii), B. Stalder (LSST) A. Rest (STScI), P. Clark, D. O'Neill, D. R. Young (Queen's University Belfast), D. E. Wright (University of Minnesota)
Source Group: ATLAS
Keywords: Supernova
Abstract:
ATLAS is a twin 0.5m telescope system on Haleakala and Mauna Loa which is robotically surveying the sky above declination -40 with a cadence of 2 days (Tonry et al. 2018, PASP, 13, 064505). Here we report the discovery of a transient (AT2019sox) in galaxy NGC 7081.

ATLAS is a twin 0.5m telescope system on Haleakala and Mauna Loa which is robotically surveying the sky above declination -40 with a cadence of 2 days (Tonry et al. 2018, PASP, 13, 064505). Two filters are used, cyan and orange (denoted c and o; all mags quoted are in the AB system). While carrying out the primary mission for Near-Earth Objects, we search for and publicly report stationary transients to the IAU Transient Name Server.  Data processing is carried out at Queen's University which combines automated source parameter filtering, machine learning image recognition, and spatial cross-matching with astronomical catalogues. More information is on the ATLAS homepage. We are submitting AstroNotes for transients that are either within 100 Mpc, or have some other interesting feature to bring to the community's attention, such as bright nuclear transients, slowly rising or rapidly fading objects.

We report a new transient source, most likely a supernova in the galaxy NGC 7081. We discovered ATLAS19ygo (AT2019sox) on MJD 58772.33 == 2019-10-16.33, at m_o = 18.70 +/- 0.15. There was no detection by ATLAS on MJD 58770.42 == 2019-10-14.42. ATLAS19ygo is offset by 11.60 arcsec north, 7.80 arcsec east from its likely host galaxy NGC 7081, which is at z = 0.011 or d = 41 Mpc (from NED), implying an absolute magnitude of M = -14.5 (assuming m-M = 33.04 and A_r = 0.13 and A_i = 0.10). Followup observations are encouraged.  

This work has made use of data from the Asteroid Terrestrial-impact Last Alert System (ATLAS) project. ATLAS is primarily funded to search for Near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogues from the survey area.  The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, and the Space Telescope Science Institute.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019sox [ATLAS19ygo]21:31:24.760+02:29:38.97NGC 70810.01091821:31:24.720+02:29:39.05SN II0.010918