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IAUC 6904: 1998bx, 1998by, 1998bz, 1998ca, 1998cb; XTE J1855-026; 1998bv

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                                                 Circular No. 6904
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 1998bx, 1998by, 1998bz, 1998ca, 1998cb
     O. Perdereau and N. Regnault, Laboratoire de l'Accelerateur
Lineaire, Universite de Paris-Sud, on behalf of the EROS
collaboration, report the discovery of five apparent supernovae,
discovered in the course of the automated supernova search with the
1-m Marly telescope (+ CCD) at La Silla (limiting mag about 20.2).
Finding charts can be found at
http://www.lal.in2p3.fr/EROS/SNe/Charts/.

SN       Date UT      R.A. (2000.0) Decl.      V        Offset
1998bx   Apr. 21   11h12m28.05  - 5 58'09.9   19.6   1".2 W, 5" N
1998by   Apr. 21   11 25 07.20  - 5 23 15.2   19.5   0".6 E, 0".6 S
1998bz   Apr. 24   12 11 05.84  - 5 35 33.8   19.1   near center
1998ca   Apr. 24   12 13 29.24  - 6 23 42.0   18.8   7" W, 7" N
1998cb   Apr. 28   10 40 16.07  - 6 15 17.2   20.0   2".3 W, 0".8 N

SN 1998bx was confirmed on CCD frames taken on Apr. 22, but was not
present on a frame taken on 1997 Mar. 7.  SN 1998by was confirmed
on CCD frames taken on Apr. 22, but was not present on a frame
taken on 1997 Mar. 15.  SN 1998bz and SN 1998ca were found by
differencing CCD frames taken on 1997 Mar. 7 and 1998 Apr. 24, and
were confirmed on CCD frames taken on Apr. 29.  SN 1998cb was
confirmed on CCD frames taken on Apr. 29, but was not present on a
frame taken on 1997 Apr. 29.


XTE J1855-026
     F. E. Marshall, Goddard Space Flight Center (GSFC); and T.
Takeshima, Universities Space Research Association and GSFC, report
the detection of a transient x-ray pulsar XTE J1855-026 with the
Proportional Counter Array on the Rossi X-ray Timing Explorer: "The
peak observed 2-10-keV flux was 13 mCrab on May 6.75 UT.  A pointed
observation on May 12.85, when the flux had faded to 6 mCrab,
revealed periodic modulation of the flux with a peak-to-peak
amplitude of about 60 percent and a period of 362 +/- 1 s.  The
best-fit position is R.A. = 18h55m.7, Decl. = -2o37' (equinox
2000.0; estimated uncertainty 6').  The source is probably a
Be/neutron star binary system.  We note that the error circle
contains the Be star BD -02o4786.  Optical observations are
strongly encouraged."


SUPERNOVA 1998bv IN HS 1035+4758
Corrigendum.  On IAUC 6900, line 1, Nizhnij Arkhyz is a site, not
a person.

                      (C) Copyright 1998 CBAT
1998 May 14                    (6904)            Daniel W. E. Green

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