Further follow-up of the young SN iPTF15ayt
ATel #7581; A. Gal-Yam (WIS), S. B. Cenko (GSFC), A. Horesh (WIS), K. Mooley, G. Anderson, R. Fender, T. Staley (Oxford) report for the iPTF collaboration
on 30 May 2015; 18:39 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay.gal-yam@weizmann.ac.il)
Subjects: Radio, Ultra-Violet, X-ray, Supernovae
Following our discovery of iPTF15ayt (Atel #7567) we report here on the status and results of additional follow-up observations. Swift observed this objects starting on JD 2457169.09 (about 0.26 days after discovery). The first set of UVOT photometry are V=17.42, B=17.80, U=19.40, UVW1=18.96, UVM2=18.80 and UVW2=18.91 (all magnitudes AB); note these contain significant host contamination in the optical bands. There is no X-ray detection with XRT to a 3 sigma upper limit of 7.5e-3 cps. For a power-law spectrum with a photon index of 2, this corresponds to a 0.3-10.0 keV flux of <~ 2.5e-13 cgs (assuming no absorption). Swift follow-up is ongoing.
Next, we observed the SN with the Arcminute MicroKelvin Imager (AMI) telescope on 2015 May 26. The AMI observation resulted in a null detection with a 3-sigma limit of 132 micro Jy at 15 GHz. Additional observations with the Jansky VLA on May 28. UT yield deeper limits (13 micor Jy RMS) at 6.1 GHz.
Unfortunately, our initially approved HST trigger could not be carried out due to technical reasons, so no HST data will be obtained for this object. We thank STScI staff and in particular H. Sana and W. Januszewski for their support and help.
