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Radio rebrightening of SN 2008bo in NGC 6643

ATEL # 1484; C. J. Stockdale (Marquette University and University of Oklahoma), K. W. Weiler (Naval Research Laboratory), S. Immler (Goddard Space Flight Center), J.M. Marcaide (University of Valencia), N. Panagia (Space Telescope Science Institute and Observatory of Catania), D. Pooley (University of Wisconsin at Madison), R. A. Sramek (National Radio Astronomy Observatory), and S. D. Van Dyk (Spitzer Science Center, California Institute of Technology)
on 18 Apr 2008; 21:09 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Kurt W. Weiler (

Subjects: Radio, Nova, Supernova

We report the detection of radio emission of the type II supernova 2008bo (CBET 1324 , 1325) with the Very Large Array (VLA) radio telescope. The measured position of the radio emission of R.A. = 18h19m54.s41, Decl. = +74o34'21".0, (equinox 2000.0) is in good agreement with the measured optical position of (ending digits) R.A. = 54.s34, Decl. = 20".9 (CBET 1324) and with the previously reported radio position of (ending digits) R.A. = 54.s30, Decl. = 21".1 (ATEL 1477). A flux density of 0.507 +/- 0.043 mJy was measured at 8.46 GHz (wavelength 3.5 cm) on April 18.52 UT. This observation supports the first radio detection (ATEL 1477), with a flux density of 0.234 +/- 0.070 mJy measured at 22.46 GHz (wavelength 1.3 cm) and 0.477 +/- 0.053 mJy at 8.46 GHz (wavelength 3.5 cm) on April 05.75 UT. No radio emission was detected near the vicinity of SN 2008bo with a three sigma upper-limit of 0.23 mJy at 8.46 GHz on April 07.10 UT. Our recent radio measurements were prompted by the X-ray brightening (ATEL 1481, 1463) detected in the Swift observations of SN 2008bo. Such a radio re-brightening is very uncommon. Further radio observations have been requested. We would like to extend our thanks to the VLA scheduling officers for their support of our observing program.

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R. E. Rutledge , Editor
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