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[vsnet-history 652] SN 1993J (Nomoto/ASCA)




Date: Thu, 8 Apr 93 09:59:04 +0900
From: nomoto@apsun1.astron.s.u-tokyo.ac.jp

======= ASCA Obs of SN93J: very hard X-rays =====

From:	CFAPS2::"green@cfaps2.span"  8-APR-1993 05:29:09.13
Date:    Wed, 7 Apr 93 15:54:13 EDT
Subject: IAUC 5753: SN 1993J; PKS 0528+134; etc.
                                                  Circular No. 5753
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
 
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 spec-
trum is hard; if it is a thermal bremsstrahlung spectrum, kT > 10
keV and N(sub)H about 10E21 cmE-2.  More observations will follow."
  
1993 April 7                   (5753)            Daniel W. E. Green


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