AAVSO Special Notice #59

Update on SN 2007gr
August 19, 2007

Data for this supernova 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

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