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Date: Tue, 6 Apr 93 19:24:56 GMT From: gav@astro.as.utexas.edu (Gerard de Vaucouleurs) Subject: SN1993J onset time Dear Dr. Kidger: In your e-mail of 04/06/93 you stated "I stick by my date of March 25.5-26.0 for the start of the explosion" [i.e. JD9072.0 -9072.5], then discuss the posibility of a later date "(probably around March 27.5). I know that de Vaucouleurs favours this later date." [i.e. 9074.0]. I wonder where you gained that idea, because it is simply not so. In my e-mail of 04/05/93 13:54:25 CDT which was sent to you and several others I stated explicitely "A preliminary reduction of ~50 available estimates to the Johnson V system ... suggests that the V maximum was reached on JD9077.7 at V = 10.5, B - V = + 0.3, WITH ONSET NEAR JD9072.0." As you can see we are in very close agreement! I am sending copies of this message to a few people so there will be no lingering misunderstanding. I was not aware of the Merlin negative observation you mention; what was his limiting magnitude? Your tabulation of multicolor observations is a very useful complement to Dr. Kato's detailed listings. With best wishes, G. de Vaucouleurs (gav@astro.as.utexas.edu) cc: wheel,alex,tkato,buta,sco,hgcjr,gav
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