AstroNote 2020-69

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DRAFT
2020-03-25 10:00:45
Type: Object/s-Discovery/Classification
Pan-STARRS Search for Kilonovae: discovery of intrinsically faint transients PS20ahh (AT2020ewd), PS20agb (AT2020ert) and PS20aek (AT2020epy).
Authors: S. Srivastav, S. J. Smartt, K. W. Smith (QUB), K. C. Chambers, M. Huber (IfA, Hawaii), 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 three intrinsically faint transients PS20ahh (AT2020ewd), PS20agb (AT2020ert) and PS20aek (AT2020epy). The absolute magnitudes of the transients are M_w = -15.6, -16.9 and -14.9, respectively.

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 intrinsically faint transients PS20ahh (AT2020ewd), PS20agb (AT2020ert) and PS20aek (AT2020epy), in the host galaxies UGC 5426 (z = 0.023 or d = 102 Mpc), LCRS B102004.0-063934 (z = 0.037 or d = 164 Mpc) and 2MFGC 12324 (z = 0.039 or d = 169 Mpc), respectively. PS20ahh was discovered on MJD 58930.30 (2020-03-22.30) at w = 19.49 +/- 0.04, PS20agb was discovered on MJD 58929.36 (2020-03-21.36) at w = 19.31 +/- 0.04, and PS20aek was discovered on MJD 58927.60 (2020-03-19.60) at w = 21.34 +/- 0.21. The absolute magnitudes for PS20ahh, PS20agb and PS20aek are M_w = -15.6, -16.9 and -14.9, respectively, after correcting for Galactic r-band extinction along the respective lines of sight. 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. Finders are 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
TNS2020ewd [PS20ahh]10:04:29.581+14:45:57.3510:04:29.581+14:45:57.35
TNS2020ert [PS20agb]10:22:34.931-06:54:36.6610:22:34.931-06:54:36.66
TNS2020epy [PS20aek]15:14:11.545+02:36:08.0615:14:11.545+02:36:08.06