AstroNote 2019-42

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DRAFT
2019-07-06 18:08:30
Type: Object/s-Discovery/Classification
PS19did (AT2019khq): PSST discovery of a faint transient source in UGC11003 (45 Mpc)
Authors: K. W. Smith, S. J. Smartt (QUB), Mark Huber, Ken Chambers (IfA), D. R. Young, O. McBrien, J. Gillanders. S. Srivastav, D. O'Neil, P. Clark, S. Sim (QUB), T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA), D. E. Wright (University of Minnesota)
Source Group: Pan-STARRS1
Keywords: Supernova
Abstract:
We report the Pan-STARRS discovery of PS19did (AT2019khq), an intrinsically faint transient in UGC11003. This galaxy has a Tully Fisher distance of 43 Mpc. At an apparent mag of w = 19.9, it has M_w = -13.5. Detections from ZTF (in Lasair) show a relatively flat lightcurve for 12 days, implying a very low luminosity or reddened supernova, an intermediate luminosity transient or a giant non-terminal outburst from a massive star. Follow-up observations of this intrinsically faint transient are encouraged. A finder is provided in the AstroNote.

We report the discovery of the following transient object as part of the Pan-STARRS Survey for Transients (PSST). Information on all objects discovered by the Pan-STARRS Survey for Transients is available at http://star.pst.qub.ac.uk/ps1threepi/ (see Chambers et al. arXiv:1612.05560, Huber et al. ATel #7153). We are releasing AstroNotes for transients of note (e.g. closer than 100Mpc, unusually faint or luminous, or rapidly evolving). 

The new transient source is in the galaxy UGC 11003. We discovered PS19did (AT2019khq) on MJD 58666.31 == 2019-07-02.31, at w = 19.9 +/- 0.1. PS19did is offset by 8 arcsec north, 1 arcsec west from UGC 11003 which is at z = 0.014. A Tully-Fisher distance is given as d = 43 Mpc (listed in  NED from Tully et al. 2016 AJ, 152, 50), implying an absolute magnitude of M = -13.5 (assuming m-M = 33.2 and A_r = 0.21). We note the distance could be as high as 70 Mpc, if a purely Hubble flow distance is calculated. 

Followup observations of this intrinsically faint transient are encouraged. We find detections from ZTF in Lasair (Smith et al. 2019 RNAAS, 3, 26, ) : 

https://lasair.roe.ac.uk/object/ZTF19abalqkq/

It shows a relatively flat lightcurve, implying a very low luminosity or reddened supernova, an intermediate luminosity transient or a giant non-terminal outburst from a massive star.  A finder is provided below. 

 

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019khq [PS19did]17:50:41.757+14:49:26.370.01417:50:41.757+14:49:26.37