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IAUC 7389: 2000au; XTE J1118+480; 2000D

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IAUC number

                                                  Circular No. 7389
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000au IN MCG +8-15-14
     T. Puckett and A. Langoussis, Mountain Town, GA, report the
discovery of an apparent supernova (mag 17.9) on an unfiltered CCD
frame (limiting mag 19.3) taken with the Puckett Observatory 0.35-m
automated supernova patrol telescope on Mar. 28.16 UT.  SN 2000au
candidate is located at R.A. = 7h53m08s.40, Decl. = +50o07'35".3
(equinox 2000.0), which is 5".1 west and 14".5 south of the center
of MCG +8-15-14.  SN 2000au was also present on an unfiltered CCD
frame taken on Mar. 29.05, but it does not appear on an unfiltered
image taken on Feb. 29.15, neither does the object appear on
Palomar Sky Survey images taken on 1998 Mar. 24 (limiting mag about
21.0) and 1954 Dec. 30 (limiting mag about 20.0).

XTE J1118+480
     R. Remillard, E. Morgan, D. Smith, and E. Smith report for the
RXTE ASM team at the Massachusetts Institute of Technology and at
Goddard Space Flight Center, NASA:  "The RXTE All-Sky Monitor has
detected x-ray emission from a new source, XTE J1118+480.  The ASM
position is centered at R.A. = 11h18m17s, Decl. = +48o03'.0
(equinox 2000.0; 90-percent-confidence radius 6').  The average
x-ray intensity (2-12 keV) was 39(8) mCrab on Mar. 29.
Retrospective ASM analysis indicates that the x-ray flux has been
slowly rising since Mar. 5.  Another modest outburst had previously
occurred during Jan. 2-29, peaking at 37(3) mCrab on Jan. 6.  The
SIMBAD database lists only an unremarkable guide star (V about 11)
near the x-ray position.  The source was confirmed in an 800-s RXTE
pointed observation beginning on Mar. 29.968 UT.  Rapid flares
(e.g., 10 s) were seen, reaching a factor of 5 above the baseline
flux near 25 mCrab and suggesting a Galactic x-ray source.  No
pulsations were detected.  The x-ray spectrum does not vary
appreciably during intense flares.  Preliminary spectral analysis
indicates a power law visible to 30 keV.  The photon index is
roughly 1.8, which is similar to Cyg X-1 in its hard state.  The
high galactic latitude (+62 deg) and x-ray properties present a
puzzling combination, and observations at other wavelengths are
urgently needed."

     Unfiltered CCD magnitudes:  Feb. 5.406 UT, 17.8: (S. Yoshida
and K. Kadota, Ageo, Saitama, Japan); Mar. 13.76, 17.5 +/- 0.2 (K.
Sarneczky, K. Sziladi, and L. Kiss, Piszkesteto station, Konkoly

                      (C) Copyright 2000 CBAT
2000 March 30                  (7389)            Daniel W. E. Green

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