AstroNote 2019-102

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DRAFT
2019-10-11 14:39:55
Type: Object/s-Discovery/Classification
Pan-STARRS Search for Kilonovae: discovery of an intrinsically faint transient in UGC 00179 (61 Mpc)
Authors: S. McLaughlin, S. J. Smartt, K. W. Smith (QUB), K. C. Chambers, M. Huber (IfA, Hawaii), S. Srivastav, O. McBrien, D. R. Young, J. Gillanders, D. O'Neill, P. Clark, S. Sim (QUB), T. de Boer, J. Bulger, J. Fairlamb, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA), T.-W. Chen (MPE), D. E. Wright (University of Minnesota), C. Stubbs (Harvard), A. Rest (STScI)
Source Group: Pan-STARRS1
Abstract:
We are carrying out the "Pan-STARRS Search for Kilonovae" which is a focused search for intrinsically faint transients, or rapidly evolving transients in galaxies which are closer than 200 Mpc in the ongoing Pan-STARRS Near Earth Object surveys (see Smartt et al. AstroNote 2019-48 for details).  Here we report the discovery of an intrinsically faint transient PS19fxf (AT2019ser) in the host galaxy UGC 00179 at a redshift of z = 0.014960, or d = 61 Mpc (from NED). 

We are carrying out the "Pan-STARRS Search for Kilonovae" which is a focused search for intrinsically faint transients, or rapidly evolving transients in galaxies which are closer than 200 Mpc in the ongoing Pan-STARRS Near Earth Object surveys (see Smartt et al. AstroNote 2019-48 for details). 

In normal survey mode, Pan-STARRS takes 4 x 45s exposures in w, i or z each night reaching 5 sigma magnitudes of w<22, i<21 and z<20.5 in each frame (see Chambers et al. 2016, 1612.05560). 

We report the discovery of an intrinsically faint transient PS19fxf (AT2019ser)  in the host galaxy UGC00179 , at a redshift of z = 0.014960, or d = 61 Mpc (from NED).  The transient was discovered at MJD 58763.48 (2019-10-07.48) at mag w = 20.3 +/- 0.1. It is coincident with the core of the host to within 0.3 arcsec (a projected 0.1 kpc radius from the galaxy centre). At this distance the absolute magnitude is M_w = -13.8 (assuming m-M = 33.9 and foreground exinction of  A_r = 0.15). 

Images were taken on the two subsequent nights and we found w = 20.3+/- 0.1  and  w = 20.4 +/- 0.1 . The transient's lightcurve appears to be flat and not declining. It may be a highly reddened supernova. Spectroscopic classification may be difficult given the location on the bright core of the host UGC00179. 

Information on all objects discovered by the "Pan-STARRS search for kilonovae" will be made available at http://star.pst.qub.ac.uk/ps1threepi/. We will release AstroNotes for all these candidates and encourage spectroscopic classification or photometric follow-up.  A finder is attached. 

These discoveries are a byproduct of the Pan-STARRS NEO survey observations supported by the NASA Grants, including No. NNX14AM74G issued through the SSO Near Earth Object Observations Program.

 

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019ser [AT2019ser]00:19:00.554+23:28:35.760.01600:19:00.552+23:28:35.71