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Radio Non-Detections of Type IIP Supernovae 2009H (NGC 1084) and 2009N (NGC 4487)

ATel #1925; C. J. Stockdale (Marquette), M. S. Heim (Marquette), K. W. Weiler (NRL), S. Immler (NASA/GSFC), C. L. M. Williams (MIT), N. Panagia (STScI), S. D. Van Dyk (Spitzer/Cal Tech), S. Ryder (AAO), J. M. Marcaide (Valencia), D. Pooley (Wisconsin), R. A. Sramek (NRAO), M. T. Kelley (UNLV)
on 5 Feb 2009; 20:57 UT
Credential Certification: Christopher J. Stockdale (chris.stockdale@mu.edu)

Subjects: Radio, Supernovae

The Type IIP Supernovae 2009H (CBET #1656, #1667), in the galaxy NGC 1084, and 2009N (CBET #1670, #1761; ATEL #1914), in the galaxy NGC 4487, have been the subject of VLA searches on 2009 Jan 27.4 (UT) (ATEL #1915) and 2009 February 4.0 (09H) and 2009 February 4.5 (09N). The second VLA search was conducted at 4.86 and 8.46 GHz. No radio emission was detected at either of the supernova locations with the following 3-sigma upper limits: At 8.46 GHz - SN 2009H, 0.14 mJy (resolution 0.86"), and SN 2009N, 0.12 mJy (res. 0.85"); and at 4.86 GHz - SN 2009H, 0.15 mJy (res. 1.5"), and SN 2009N, 0.13 mJy (res. 1.4"). No further VLA observations are planned. We would like to extend our thanks to the VLA scheduling officers and telescope operators for their support of our observing program. The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.