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Very Large Array Search for Radio Emission from Supernova 2008bo In NGC 6643

ATEL # 1477; 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 15 Apr 2008; 15:28 UT
Password Certification: Christopher J. Stockdale (

Subjects: Radio, Nova, Supernova
Referred to by ATEL #: 1481

We report the possible 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.s30, Decl. = +741o348'21".1, (equinox 2000.0) is in good agreement with the measured optical position of (ending digits) R.A. = 54.s34, Decl. = 20".9 (CBET 1324). A flux density of 0.230 +/- 0.066 mJy was measured at 22.46 GHz (wavelength 1.3 cm) and 0.447 +/- 0.047 mJy at 8.46 GHz (wavelength 3.5 cm) on April 05.57 UT. We further report that 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 radio measurements also indicate the presence of diffuse radio emission, which may be indicative of the star-forming regions detected in the Swift UV observations in the vicinity of SN 2008bo (ATEL 1463). Given that SN 2008bo was only weakly detected in the first observation and not detected in the second observation, no further radio observations with the VLA are planned. 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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