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P60 Photometric Monitoring of SN2009hd

ATEL # 2113; M. M. Kasliwal (Caltech)
on 8 Jul 2009; 0:37 UT
Password Certification: Mansi Manoj Kasliwal (

Subjects: Optical, Nova, Supernova, Transients
Referred to by ATEL #: 2114, 2117, 2118

Photometric monitoring of SN2009hd (CBET#1867) with the Palomar 60-inch (P60) shows that this transient is very red and evolving slowly. On UT 2009 Jul 6.19, I measure g=17.5, r=16.0, i=15.5, z=15.1, B=18.2, V=17.0. Uncorrected for extinction, this corresponds to a faint absolute visual magnitude of -13. Photometric calibration was done wrt SDSS and the uncertainty in these magnitudes is <0.1. Image subtraction using SDSS images as a template was performed to obtain griz magnitudes. Comparison to Swift photometry obtained on Jul 4 (ATEL#2109) and further P60 observations on Jul 7 shows no evidence of evolution within uncertainties. Daily multi-band follow-up with P60 continues.

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