[vsnet-obs 20205] (fwd) SN 1999X photometry from APO

[Taichi Kato <tkato>]

From owner-vsnet-adm@kusastro.kyoto-u.ac.jp Tue Apr 20 09:10 JST 1999
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Date: Mon, 19 Apr 1999 17:10:42 -0700 (PDT)
From: Kevin Krisciunas <kevin@orca.astro.washington.edu>
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       Photometry of SN 1999X from Apache Point Observatory

Imagery by Karen Gloria and Camron Hastings at the telescope, with remote observers
Kevin Krisciunas, Gene Magnier, and Alan Diercks, and reduction by Krisciunas.

Landolt standards in the Rubin 149 field were used on five clear nights to determine
the brightness of 3 field stars near NGC 2595 so that the SN could be reduced with
respect to those stars even on non-photometric nights.

Here are the nightly means.  Julian Date is 2451000 + date given.  The last four columns
are the numbers of frames+stars used to determine the V, B-V, V-R, and V-I values, respectively.
Typically one frame was taken on a night in BVI and the SN was reduced with repect
to three of the field stars.

   JD          V     +/-     B-V    +/-     V-R    +/-     V-I    +/-

 240.6313   17.916  0.013  1.134  0.035   *****  *****   0.623  0.028      3    3    0    3
 249.7862   18.272  0.010  1.132  0.018   *****  *****   0.541  0.027      3    3    0    3
 252.6329   18.287  0.007  1.091  0.013   0.251  0.009   0.416  0.023      3    3    3    3
 279.6191   18.924  0.009  0.832  0.018   0.148  0.015   0.169  0.037      5    5    5    3

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