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Pan-STARRS1 Medium Deep Survey Discovery of a SN Ia at z=0.031

ATEL # 2448; P. Challis, G. Narayan (Harvard/CfA), M. Huber (JHU), A. Rest, R. Chornock, R. J. Foley (Harvard/CfA), J. Tonry, P. A. Price (IfA/Hawaii), C. Stubbs (Harvard), A. Riess (JHU), W. M. Wood-Vasey (Pitt), S. J. Smartt (Queen's Univ. Belfast), E. Berger, R. P. Kirshner, D. J. Sand, A. M. Soderberg (Harvard/CfA), and the PS1 Builders.
on 18 Feb 2010; 19:06 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Ryan Chornock (

Subjects: Optical, Nova, Supernova, Transients

Further to ATel #2398, we report the discovery of a Type Ia supernova at a relatively low redshift in Pan-STARRS1 Medium Deep Survey data processed by the Harvard/JHU transient pipeline.

The supernova (PS1 ID=1000023) was discovered on 2010 Feb. 12.5 UT at a magnitude of r=17.3. The coordinates are RA(J2000)=10:42:41.889 Dec(J2000)=+58:50:37.77. This position is 5.1" east and 1.5" south of the nucleus of the host galaxy, CGCG 290-062 (SDSS J104241.20+585039.0), which has a cataloged redshift from SDSS of z=0.031.

A spectrum of the supernova obtained by E. Falco on Feb. 17 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST) shows it to be a SN Ia. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that the object has a spectral age of 2.5 4 days before maximum light. Using the SDSS redshift for the host galaxy, the absorption minimum of the Si II 6355 line is blueshifted by 12,000 km/sec.

Finding charts of this object can be found here.

This discovery was enabled using the PS1 System operated by the PS1 Science Consortium (PS1SC) and its member institutions. The PS1 Surveys have been made possible through the combination of the Institute for Astronomy at the University of Hawaii, The Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg, and the Max Planck Institute for Extraterrestial Physics, Garching, The Johns Hopkins University, the University of Durham, the University of Edinburgh, the Queen's University of Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Network, and the National Central University of Taiwan.

We thank the staff at the PS1 telescope and E. Falco at the FLWO 1.5-m telescope for their assistance in obtaining these observations.

Pan-STARRS Acknowledgment and Builders List

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates