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IAUC 7029: 1987S, 1988af, 1988ag, 1996co; XTE J1946+274

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                                                 Circular No. 7029
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVAE 1987S, 1988af, 1988ag, 1996co
     Jean Mueller reports her discoveries of four apparent
supernovae on photographs taken with the 1.2-m Oschin Schmidt
Telescope in the course of the second Palomar Sky Survey:

SN           UT          R.A.  (2000)  Decl.     Mag.   Offset
1987S   1987 Aug. 28   21 49 45.05 +12 12 54.4   18     3" E, 10" N
1988af  1988 Nov. 19    8 17 24.36 +45 38 24.9   17.5   5".8 E, 7".6 S
1988ag  1988 Dec. 11    9 56 45.85 + 6 56 22.5   18     8".7 E, 7" N
1996co  1996 Dec. 20   10 18 57.48 +62 15 12.1   18     5".2 W, 9".2 S

SN 1987S also appears at mag about 19 on a sky-survey plate taken
by J. Phinney and Mueller on 1987 Sept. 17; no object appears at
the position of SN 1987S on the Digitized Sky Survey or on a IIIa-F
sky-survey plate taken on 1990 Oct. 22 by C. Brewer and J. D.
Mendenhall.  SN 1988af in MCG +08-15-057, discovered on a plate
taken by P. Moniot, also appears at mag about 20 on another survey
plate taken on 1989 Feb. 27 by Moniot and Brewer; there is no
object at the position of SN 1988af on the Digitized Sky Survey or
on a sky-survey plate taken on 1990 Mar. 18 by Mueller.  SN 1988ag,
discovered on a plate taken by Brewer and Mueller, also appears at
mag about 18.5 on a 0.46-m Palomar Schmidt telescope film taken by
E. M. and C. S. Shoemaker (identified by B. Skiff and C. S.
Shoemaker) on 1989 Jan. 9; there is no object at the position of SN
1988ag on the Digitized Sky Survey or on a IIIa-F sky-survey plate
taken on 1997 Mar. 9 by Mueller and Mendenhall.  SN 1996co,
discovered on a plate taken by K. Rykoski and Mendenhall, also
appears at mag about 20 on a sky-survey plate taken on 1997 Jan. 11
by Mueller.  There is nothing at the position of SN 1996co on a
sky-survey plate taken on 1997 May 6 or on CCD frames taken by R.
Gal with the Palomar 1.5-m telescope on 1997 May 1.


XTE J1946+274
     R. M. Hjellming, National Radio Astronomy Observatory (NRAO);
and A. J. Mioduszewski, Joint Institute for VLBI in Europe and NRAO,
report:  "Continued Very Large Array observations of the error
region of XTE 1946+274 (IAUC 7014, 7016) on Oct. 12 and 13 have
failed to confirm the possible radio counterpart we reported on
IAUC 7027.  Reanalysis of the Oct. 7.02 UT radio data at 1.49 GHz
indicates it is possible that the reported radio source was a
spurious artifact due to imperfect CLEAN sidelobe subtraction for
another strong radio source in the field."

                      (C) Copyright 1998 CBAT
1998 October 15                (7029)            Daniel W. E. Green

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