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IAUC 5763: 1993J; GRB 930309

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                                                  Circular No. 5763
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
     J. A. Phillips and S.R. Kulkarni, California Institute of
Technology, report:  "Using the four-element millimeter array of
the Owens Valley Radio Observatory, we have detected a compact, 98-
GHz radio source at R.A. = 9h51m19s.1 +/- 0s.5, Decl. = +69 15'27"
+/- 1" (equinox 1950.0), approximately coincident with the position
of SN 1993J (IAUC 5731).  Synthesis images (97.98 GHz) of a field
centered at end figures 19s.0, 26".5 were obtained on Apr. 11 and
14.  On Apr. 11.24-11.52 UT, the flux density was 20 +/- 5 mJy at
end figures 18s.8, 26"; on Apr. 14.23-14.53, 29 +/- 6 mJy at 19s.3,
27".   The synthesized beam was 5" x 4" on both dates and the
source was unresolved.  This marks the first detection of a supernova
explosion at such high radio frequencies, which we intend to
monitor at 1- to 2-week intervals."
     L. Morbidelli, TIRGO Observatory; and M. Kidger, Instituto de
Astrofisica de Canarias, communicate:  "We obtained near-infrared
photometry of SN 1993J with the 1.5-m TIRGO Telescope in Gornergrat:
Apr. 14.949 UT, J = 9.99 +/- 0.07, H = 9.92 +/- 0.08, K = 9.71 +/-
0.13; 15.864, 10.12 +/- 0.07, -, -; 15.937, 10.26 +/- 0.10, 10.07
+/- 0.04, 9.83 +/- 0.03; 15.964, 10.13 +/- 0.07, 10.04 +/- 0.05,
9.78 +/- 0.05.  The data from Apr. 14.949 were taken in poor
conditions. The data show that the infrared brightness has increased
by 0.6-0.8 mag in all bands since Apr. 3.39 (IAUC 5757).  The color
changes are consistent with the development of strong hydrogen lines."


GRB 930309
     K. Hurley, Space Sciences Laboratory, University of California,
Berkeley, on behalf of the Third Interplanetary Network team for
triangulation of cosmic gamma-ray bursts (M. Sommer, M. Boer, and
M. Niel for Ulysses; G. Fishman, C. Kouveliotou, C. Meegan, and M.
Brock for BATSE; T. Cline for Ulysses and BATSE), communicates:
"An annulus of possible arrival directions has been derived for GRB
930309 (IAUC 5749, 5750, 5755) by timing the arrival of the event
at the Ulysses and Compton-GRO (BATSE) spacecraft, which were
separated by 1994 light-seconds.  The annulus is centered at R.A. =
22h10m24s, Decl. = +14 38'.7 (equinox 2000.0), with radius 36 36'
+/- 5'.  The CGRO BATSE position is consistent with this narrow
arc, but the radio source reported on IAUC 5750 and the infrared
source reported on IAUC 5755 are at least 4 from the timing arc and
therefore are not related to the gamma-ray burster."


1993 April 16                  (5763)            Daniel W. E. Green

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