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Date: Sat, 10 Jul 93 14:35:21 CDT
From: gav@astro.as.utexas.edu (Gerard de Vaucouleurs)
Subject: SN1993J, data from India
I am retransmitting to you for diffusion the following observations received
today from Dr. T.P. Prabhu and colleagues working at the Vainu Bappu
Observatory, Kavalur, India. They are reduced to the UBVRcIc system and
fill the gap between Europe and Japan.
Greetings from
G. de Vaucouleurs
From: iiap!tpp@iiap.ernet.in (Dr.T.P.Prabhu)
Message-ID: <vsnet-history1204@hoge.baba.hajime.jp>
To: gav@astro.as.utexas.edu
Subject: SN93J
Status: RO
Dear Prof. de Vaucouleurs,
I am sending the CCD photometric results on SN 1993J from VBO, Kavalur,
India together with details of instrument and reduction. The results may
be made available to anyone who wishes to use them. If further clarification
is needed I will be happy to supply. We have measurements of star C also
on the same days if someone is interested in compiling the data with a
view to studying its variability. Our observations are concluded for this
season.
Best regards,
Tushar Prabhu
tpp@iiap.ernet.in
23 June 1993
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Supernova 1993J: CCD photometric results.
Y. D. Mayya, T. P. Prabhu, Ram Sagar, A. Subramaniam, A. K. Pati,
Indian Institute of Astrophysics, Bangalore 560034, India
K. P. Singh, Tata Institute of Fundamental Research, Bombay 400005, India
Gopal-Krishna, National Centre for Radio Astrophysics, Pune 411007, India
Telescope : 2.3m reflector, Vainu Bappu Observatory, Kavalur, India
Instrument: Prime Focus CCD camera with GEC 8603 chip
Method : Differential photometry with star B as standard. Correction
for colour coefficient in transformation equations is made.
Date V B-V V-R V-I
1993
APR 14.68 10.957 0.521 0.390
APR 15.67 10.898 0.497 0.397
APR 16.68 10.865 0.530 0.425
APR 17.65 10.869 0.630 0.406
APR 18.62 10.847 0.576 0.396
APR 19.62 10.885 0.675 0.426
APR 21.61 10.976 0.780 0.473 0.520
APR 22.59 11.049 0.876 0.475
APR 24.60 11.267 0.935 0.557 0.637
MAY 21.61 12.473 1.269 0.686
MAY 23.64 12.538 1.392 0.707
Star B 11.900 0.500 0.300 0.600 Comparison; assumed mag
+/-0.018 +/-0.023 +/-0.008 +/-0.008 rms of correction
Star A 11.407 0.539 0.306 0.604 Check star; derived mag
+/-0.016 +/-0.021 +/-0.022 0.010 rms of derived mag
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