DRAFT
2020-04-15 09:10:35
Type: Object/s-Discovery/Classification
Bibcode: 2020TNSAN..83....1S
Pan-STARRS Search for Kilonovae: discovery of an intrinsically faint transient in NGC 5672 (57 Mpc)
Authors: S. J. Smartt, K. W. Smith, M. Fulton (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 (Stockholm), D. E. Wright (University of Minnesota), C. Stubbs (Harvard), A. Rest (STScI)
Source Group: Pan-STARRS
Keywords: Supernova, Transient
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 PS20bxv (AT2020hdh) in the host galaxy NGC 5672, at a redshift of z = 0.012, or d = 57 Mpc (from NED).  Its discovery magnitude (MJD = 58951.56) is i = 18.33 +/- 0.20, and hence an absolute magnitude of M_i = -15.45 +/- 0.25.

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 PS20bxv (AT2020hdh)  in the probable host galaxy NGC 5672, at a redshift of z = 0.012, or d = 57 Mpc (from NED).  The transient was discovered at MJD = 58951.56 (2020-04-12.56) at mag i = 18.33 +/- 0.20. It is offset from the host by 3.1" N, 1.6" E ( a projected 0.9 kpc radius from the galaxy centre). At this distance the absolute magnitude is M_i = -15.45 (assuming m-M = 33.76 and foreground extinction of  A_i = 0.02). Spectroscopic classification is encouraged. 

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
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2020hdh [PS20bxv] 14:32:38.475 +31:40:15.64 SN NGC 5672 0.011785 14:32:38.466 +31:40:15.57 SN Ic 0.012
AstroNote Publication Timestamp Title Authors
2019-48 2019-07-20 17:37:13 Pan-STARRS Search for Kilonovae : discovery of an intrinsically faint transient in UGC 12798 (68 Mpc) S. J. Smartt, (Queen's University Belfast), K. C. Chambers, (IfA, University of Hawaii) K. W. Smith (QUB), M. Huber (IfA), S. Srivastav, O. McBrien, D. R. Young, J. Gillanders, D. O'Neil, 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)
File Comments
2020hdh_i_band_finder_0.jpeg Pan-STARRS i-band finder for PS20bxv (2020hdh).

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