AstroNote 2020-92

Primary tabs

DRAFT
2020-04-25 16:15:22
Type: Object/s-Discovery/Classification
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-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 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
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020hzd [PS20cnm]15:35:02.542-12:08:49.222MASX J15350290-12083920.05115:35:02.535-12:08:49.19