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IAUC 6427: GRS 1739-278; 1996ah; 1996ai; 78P

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                                                  Circular No. 6427
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

GRS 1739-278
     I. F. Mirabel and J. Marti, Service d'Astrophysique, Centre
d'Etudes de Saclay; P. A. Duc, European Southern Observatory (ESO);
and L. F. Rodriguez, Universidad Nacional Autonoma de Mexico,
communicate:  "Deep images in the bands I, J, and K were obtained
with several ESO telescopes in the context of a TOO program in a
search for optical and/or infrared counterparts of the x-ray/radio
nova GRS 1739-278 (IAUC 6348, 6383).  The first observations were
on Apr. 1, one day after the ROSAT detection of a bright x-ray
source (IAUC 6426), and they were continued for an interval of
several weeks.  We find a possible highly-reddened counterpart in
all observed bands within 1" of the radio counterpart at R.A. =
17h42m40s.0, Decl. = -27o44'53" (equinox 2000.0).  Mean approximate
magnitudes are R = 20.5, J = 16.0, K = 14.7.  An optical spectrum
obtained on Apr. 24-25 with the 3.6-m telescope by H. Duerbeck and
S. Benetti showed no strong H-alpha emision line."

SUPERNOVA 1996ah IN NGC 5640
     G. V. Williams, Harvard-Smithsonian Center for Astrophysics,
provides his measurement of the position of SN 1996ah from a CCD
image taken by P. Challis on Apr. 16.127 UT with the 1.2-m
reflector at Mt. Hopkins:  R.A. = 14h20m39s.02, Decl. =
+80o07'21".0 (equinox 2000.0), which is 5".0 west and 1".5 south of
the galaxy's center.
     D. D. Balam, University of Victoria, reports his measurement
of the position (end figures) for SN 1996ah from images obtained by
G. C. L. Aikman and F. Dossa with the 1.82-m Plaskett telescope
(Dominion Astrophysical Observatory) on June 25.38 UT:  38s.83,
21".0 (which is 5".7 west and 1".4 south of the galaxy's center).

SUPERNOVA 1996ai IN NGC 5005
     S. Pesci, Milan, reports that P. Mazza observed NGC 5005 on
June 13.9 UT with a 0.40-m telescope and saw nothing at the
position of SN 1996ai to a limiting visual magnitude of 15.0 (poor
sky conditions).

     CCD magnitude estimates:  June 18.37 UT, 20.4 (W. Offutt,
Cloudcroft, NM, 0.6-m f/7 reflector); 26.34, 21.0 (C. W.
Hergenrother, Mt. Hopkins, AZ, 1.2-m reflector; stellar appearance).

                      (C) Copyright 1996 CBAT
1996 July 1                    (6427)            Daniel W. E. Green

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