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IAUC 5753: 1993J; PKS 0528+134; Corrs

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IAUC number 

                                                  Circular No. 5753
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1993J IN NGC 3031
     Y. Tanaka (Institute of Space and Astronautical Science) and
the ASCA team communicate:  "The x-ray astronomy satellite ASCA
(Advanced Satellite for Cosmology and Astrophysics), launched on
Feb. 20, observed SN 1993J from Apr. 5.25 to Apr. 6.03 UT for an
exposure time of about 37 000 s with the gas scintillation imaging
spectrometers and the x-ray CCD cameras.  A bright x-ray source was
found at the optically determined position of SN 1993J within an
accuracy of 0'.1.  More than 10 000 photons were collected from the
source.  For an assumed distance of 3.2 Mpc, the source luminosity
was about 5 x 10E39 erg/s in the range 1-10 keV.  The energy spectrum
is hard; if it is a thermal bremsstrahlung spectrum, kT > 10
keV and N(sub)H about 10E21 cmE-2.  More observations will follow."


PKS 0528+134
     The Compton Observatory EGRET Team (P. Sreekumar, B. L. Dingus,
D. L. Bertsch, C. E. Fichtel, J. A. Esposito, R. C. Hartman, S. D.
Hunter, J. R. Mattox, and D. J. Thompson, Goddard Space Flight
Center, NASA; D. A. Kniffen, Hampden-Sydney College; J. Chiang, J.
Fierro, Y. C. Lin, P. F. Michelson, and P. L. Nolan, Stanford
University; E. Schneid, Grumman Aerospace Corporation; and K. Brazier,
G. Kanbach, H. A. Mayer-Hasselwander, C. von Montigny, Max-Planck-
Institut fur Extraterrestrische Physik) communicates:  "We report
detection of gamma-rays from the quasar PKS 0528+134 during the
observation interval Mar. 23-29 at a level approximately three times
the observed intensity during the early part of the GRO mission
(1991 May 16-30; Hunter et al. 1993, to appear in Ap.J. 409).  This
makes PKS 0528+134 as bright as the Crab Pulsar in high gamma-rays.
Additional EGRET observations of this region in the sky are planned
during 1993 May 13-25."


CORRIGENDA
     On IAUC 5728, 'GRO J0422+32', line 10, for  (equivalent width
2 nm)  read  (equivalent width 0.2 nm)
     On IAUC 5733, SN 1993J, line 3, for  Mar. 30  read  Mar.
29.876 UT
     On IAUC 5750, line 10, for  NH column density  read  N(sub)H
column density
     On IAUC 5752, SN 1993J, last line, for  12 mJy at 20 cm."
read  12 mJy at 2 cm."


1993 April 7                   (5753)            Daniel W. E. Green

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