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IAUC 6409: 1996ae; MXB 1730-335

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                                                  Circular No. 6409
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)

SUPERNOVA 1996ae IN NGC 5775
     A. Vagnozzi, G. Piermarini, and V. Russo, S. Lucia Observatory,
report their discovery of an apparent supernova (mag 16.5) in NGC
5775, found on a CCD image exposed on May 21.951 UT; they provide
the following position for the new star: R.A. = 14h53m59s.81, Decl.
= +3o31'46".3 (equinox 2000.0), which is about 31" east and 54"
south of the center of NGC 5775.  Confirmatory images (limiting
stellar mag about 19.5) were taken at S. Lucia Observatory on May
21.969, 21.976, 22.903, and 23.939, and by A. Nakamura at Kuma,
Ehime, Japan, on May 24.649.  G. Hurst, The Astronomer, reports
that the object is also present on CCD images obtained on May 25.9-
26.0 near mag about 17 by M. Armstrong (Rolvenden, U.K.), D.
Strange (Dorset, U.K.), and T. Platt (Binfield, U.K.); the new star
is not present on the Carnegie Atlas of Galaxies, panel 289.

MXB 1730-335
     W. H. G. Lewin, E. Morgan, D. W. Fox, and R. Rutledge,
Massachusetts Institute of Technology; L. Bildsten, University of
California, Berkeley; T. Dotani, Institute of Space and
Astronautical Science; L. Lubin, Carnegie Observatories; M. van der
Klis, Astronomical Institute 'Anton Pannekoek', University of
Amsterdam (UA); and J. van Paradijs, University of Alabama in
Huntsville and UA, report:  "Following detection of the rapid
burster MXB 1730-335 with the RXTE satellite's All-Sky Monitor
(IAUC 6390), we observed the source on May 3, 7, and 13 with its
PCA (2-60 keV).  On the first two occasions, it exhibited type-II
bursts (spasmodic accretion) with durations of 10-15 s and
recurrence times of roughly 100 s (May 3) and 400 s (May 7).  These
bursts exhibited the usual 'ringing' during their decay (cf. Tan et
al. 1991, MNRAS 251, 1).  Detailed inspection of the burst power
spectra also shows 5- to 7-Hz quasiperiodic oscillations on May 3
but not on May 7.  No coherent power is seen above the 99.9-percent
confidence threshold between 10 and 2048 Hz on either date.  For
the first two observations, we can place an upper limit of 44 mCrab
on any persistent emission from the rapid burster (assuming a Crab-
like spectrum).  On the third observation, no bursts were observed,
and our upper limit for any persistent emission is 21 mCrab.
Quick-look results from the ASM team indicate that the source is no
longer active."

                      (C) Copyright 1996 CBAT
1996 May 27                    (6409)            Daniel W. E. Green

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