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IAUC 7719: 2001ej; 2001ek; V4739 Sgr; V4740 Sgr

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                                                  Circular No. 7719
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2001ej IN UGC 3829
     A. Dimai, Cortina d'Ampezzo, Italy, reports his discovery of
an apparent supernova (mag about 16.5) on CCD images taken on Sept.
17.12 (limiting mag about 18.5) and 18.14 UT (limiting mag about
19.5) with a 0.51-m reflector in the course of the CROSS program
(cf. IAUC 7373).  SN 2001ej is located at R.A. = 7h23m43s.23, Decl.
= +33o26'38".0 (equinox 2000.0), which is about 4" west and 7"
north of the center of UGC 3829.  A CROSS image taken on Apr. 5
showed nothing at this position (limiting mag about 18.5), and
nothing is visible on Palomar Sky Survey red and blue plates.


SUPERNOVA 2001ek IN ANONYMOUS GALAXY
     F. R. Boffi, Space Telescope Science Institute (STSI), on
behalf of the Supernovae at High Z Team at the STSI, reports Hubble
Space Telescope (HST) observations of the probable supernova
reported by P. Challis on IAUC 7668.  Observations taken with the
HST-WPC2 instrument on Aug. 3 confirm the detection of the
supernova and yield photometric measurements of [F555W] = 25.45 +/-
0.05, [F675W] = 23.99 +/- 0.03, and [F814W] = 23.45 +/- 0.03.
Boffi adds:  "The observed colors, and the amounts and signs of the
magnitude changes in 44 days, are best explained in terms of a
type-IIP supernova (at redshift 0.25-0.40) that was discovered
about 20-40 days past maximum and whose spectrum is affected by
little or no reddening.  The corresponding rest-frame B absolute
magnitude at maximum is estimated to be -17.1 +/- 0.6, which is
typical of a type-IIP supernova (Patat et al. 1994, A.Ap. 282, 731)."


V4739 SAGITTARII
     CCD photometry by A. C. Gilmore and P. M. Kilmartin at Mount
John (cf. IAUC 7702):  Sept. 2.358 UT, V = 11.55, U-B = -0.71, B-V
= -0.32, V-R = +1.67, V-I = +1.14; 8.333, 12.76, -0.74, -0.31,
+1.41, +1.02; 9.356 (marginal conditions; clouds), 12.96, -0.71,
-0.34, +1.39, +0.70; 10.423, 13.23, -0.78, -0.41, +1.37, +1.06;
11.365, 13.50, -0.82, -0.47, +1.45, +0.9; 12.348, 13.59, -0.80,
-0.38, +1.32, +0.6.


V4740 SAGITTARII
     Visual magnitude estimates:  Sept. 12.250 UT, 7.0 (J. Bedient,
Honolulu, HI); 14.024, 7.3 (R. Shida, Sao Paulo, Brazil); 15.92,
7.5 (J. Carvajal, Avila, Spain); 17.625, 7.3 (W. Souza, Sao Paulo,
Brazil).

                      (C) Copyright 2001 CBAT
2001 September 18              (7719)            Daniel W. E. Green

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