AstroNote 2019-99

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DRAFT
2019-10-09 15:39:03
Type: Object/s-Discovery/Classification
Pan-STARRS Search for Kilonovae: PS2 discovery of an intrinsically faint transient (AT2019set) in CGCG 483-035 (133 Mpc)
Authors: K. W. Smith, S. J. Smartt (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 with Pan-STARRS2 of an intrinsically faint transient PS19fxk (AT2019set) in the host galaxy CGCG 483-035, at a redshift of z = 0.032, or d = 133 Mpc (from NED), at w = 20.00 +/- 0.07 and M_w = 15.9.

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). 

The second telescope in the Pan-STARRS system (PS2, Chambers et al. AstroNote 2019-81) is undergoing scientific commissioning. 

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 with Pan-STARRS2 of an intrinsically faint transient PS19fxk (AT2019set) in the host galaxy CGCG 483-035, at a redshift of z = 0.032 or d = 133 Mpc (from NED).  The transient was discovered at MJD 58761.57 == 2019-10-05.57, at m_w = 20.00 +/- 0.07. It is offset from the host by 6.92" N, 1.79" W (a projected 5.1 kpc radius from the galaxy centre). At this distance the absolute magnitude is M_w = -15.9 (assuming m-M = 35.62 and foreground extinction of A_r = 0.261). Spectroscopic classification is encouraged. 

We will release AstroNotes for all these kilonova 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
TNS2019set [PS19fxk]02:25:16.214+24:16:00.07SN0.03202:25:16.214+24:16:00.07