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Special Notice #59: Update on SN 2007gr

August 19, 2007: Data for SN 2007gr can now be submitted to the AAVSO using the following Harvard Designation and/or name: 0237+36B SN 2007GR

Latest report from Martin Nicholson is that the SN is at V=12.83 and continuing to rise. The two prior SNe in NGC 1058 both reached a peak brightness about this level, so SN 2007gr may not get much brighter.

CBET 1036 from Chornock et al. suggests that this supernova is of Type Ib/c. Their preliminary spectroscopic calibration cannot distinguish between these two types; however, it is unlikely to be a Type Ia or any Type II.

We expect to have a BVR calibration of this field later this week.

Arne Henden

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