AstroNote 2020-108

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DRAFT
2020-05-21 22:52:50
Type: Object/s-Discovery/Classification
Bibcode: 2020TNSAN.108....1S
Pan-STARRS Search for Kilonovae: discovery of an intrinsically faint transient in CGCG 051-048 (177 Mpc)
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
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 PS20dgd (AT2020knr) in the host galaxy CGCG 051-048, at a redshift of z = 0.041, or d = 177 Mpc (from NED). Its discovery magnitude (MJD = 58987.49) is w = 20.11 +/- 0.06, and hence an absolute magnitude of M_w = -16.3 +/- 0.2.

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 PS20dgd (AT2020knr) in the host galaxy CGCG 051-048, at a redshift of z = 0.041, or d = 177 Mpc (from NED). The transient was discovered at MJD 58987.49 (2020-05-18.49) at mag w = 20.11 +/- 0.06. It is offset from the host by 0.8" S, 7.9" E ( a projected 6.4 kpc radius from the galaxy centre). At this distance the absolute magnitude is M_w = -16.3 (assuming m-M = 36.24 and foreground exinction of  A_w = 0.18). Spectroscopic classification is encouraged. 

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
TNS2020knr [PS20dgd]16:07:49.816+02:59:18.0516:07:49.809+02:59:18.06
AstroNotePublication TimestampTitleAuthors
2019-482019-07-20 17:37:13Pan-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)
FileComments
2020knr_finder.jpegfinder for 2020knr
2020knr_forced_phot.pngPS1 forced photometry