AstroNote 2020-76

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DRAFT
2020-04-03 14:59:21
Type: Object/s-Discovery/Classification
AT2020fsb: a faint transient at 33 Mpc discovered by ZTF with complimentary ATLAS data
Authors: S. Srivastav, K. W. Smith, O. McBrien, S. J. Smartt, J. Gillanders, P. Clark, M. Fulton, D. O'Neill, D. R. Young, M. McCollum (Queen's University Belfast), T.-W. Chen (Stockholm), J. Anderson (ESO), L. Denneau, H. Flewelling, A. Heinze, J. Tonry, H. Weiland (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), D. E. Wright (University of Minnesota)
Source Group: ATLAS
Keywords: Supernova
Abstract:
Here we report ATLAS detections of the ZTF discovered transient AT2020fsb in galaxy ESO 515- G 004. At a distance of 33 Mpc, the transient has an absolute magnitude of M_c = -16.6 +/- 0.2. We draw attention to this nearby interesting transient and encourage spectroscopic classification.

We have been submitting AstroNotes for ATLAS transients (Smith et al. 2020 arXiv:2003.09052) that are either within 100 Mpc, or have some other interesting feature to bring to the community's attention, such as bright nuclear transients, slowly rising or rapidly fading objects.

We would like to bring to the attention of the community a candidate supernova in the nearby galaxy ESO 515- G 004. The transient AT2020fsb was discovered by ZTF on MJD 58941.42 == 2020-04-02.42 at r = 16.57 +/- 0.04 and was reported to the TNS by ALeRCE. The transient was subsquently detected by ATLAS  3hrs later n MJD 58941.55 == 2020-04-02.55, at m_c = 16.72 +/- 0.02. There was no detection by ATLAS on MJD 58929.61 == 2020-03-21.61. No useful pre-discovery data is available from ZTF. 

https://lasair.roe.ac.uk/object/ZTF20aaunfpj/
https://alerce.online/object/ZTF20aaunfpj

The host galaxy is at a redshift of z = 0.008 or d = 33 Mpc (from NED), implying an absolute magnitude of M = -16.6 (assuming m-M = 32.60 and A_g = 0.84 and A_r = 0.58). The host is an irregular blue galaxy. The transient may be intriniscally faint, or a young, rising supernova. 

Followup observations are encouraged.  

 

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020fsb [ZTF20aaunfpj]15:39:03.810-25:58:28.34ESO 515- G 0040.00751515:39:03.810-25:58:28.34SN II0.007515