DRAFT
2020-04-25 16:15:22
Type: Object/s-Discovery/Classification
Bibcode: 2020TNSAN..92....1F
Pan-STARRS Search for Kilonovae: discovery of an intrinsically faint transient in 2MASX J15350290-1208392 (174 Mpc)
Authors: M Fulton, 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 (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 PS20cnm (AT2020hzd) in the host galaxy 2MASX J15350290-1208392, at a redshift of z = 0.051 or d = 174 Mpc (from NED_D). Its discovery magnitude on MJD = 58960.50 (2020-04-21.50) is w = 21.16 +/- 0.12, hence an absolute magnitude of M_w = -15.43 +/- 0.87.

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 PS20cnm (AT2020hzd)  in the host galaxy 2MASX J15350290-1208392, at a redshift of z = 0.051, or d = 174 Mpc (from NED_D). The transient was discovered on MJD = 58960.50 (2020-04-21.50) at mag w = 21.16 +/- 0.12. It is offset from the host by 10.1" S, 4.9" W (a projected 9.5 kpc radius from the galaxy centre). At this distance, the absolute magnitude is M_w = -15.43 (assuming m-M = 36.20 and foreground extinction of  A_w = 0.39). 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 2020hzd [PS20cnm] 15:35:02.542 -12:08:49.22 2MASX J15350290-1208392 0.051 15:35:02.535 -12:08:49.19
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
PS20cnm_w_band_finder.jpeg Pan-STARRS w-band finder for PS20cnm.

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