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IAUC 5773: 1993J; GRS 1915+105

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                                                  Circular No. 5773
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
     G. G. Pooley and D. A. Green, Mullard Radio Astronomy Observatory,
Cambridge, communicate:  "Continued daily monitoring of SN
1993J with the Ryle Telescope at 15.5 GHz shows an approximately
linear increase in flux density from its detection at this frequency
on Apr. 5 (IAUC 5751) to about 33 mJy during Apr. 21.70-21.85
UT.  The source is clearly above the 20-mJy peak predicted for Apr.
19 on IAUC 5762, and does not yet appear to have reached a maximum.
The position of the source is consistent with the radio positions
reported on IAUC 5759, 5763, and 5768 and with the recent optical
position on IAUC 5767."
      W. Romanishin, University of Oklahoma, reports observations
of SN 1993J using the Kitt Peak 1.3-m telescope (+ SQIID infrared
imaging detector).  The following magnitudes (+/- 0.02 mag or less)
have been derived relative to the brightest two comparison stars
given by Odewahn (IAUC 5760):  Apr. 14.17 UT, J = 10.22, H = 10.15,
K = 9.91; 15.15, 10.18, 10.15, 9.87; 16.14, 10.13, 10.09, 9.89;
17.13, 10.10, 10.07, 9.83; 18.14, 10.05, 10.05, 9.82; 19.14, 10.04,
10.04, 9.82.


GRS 1915+105
     I. F. Mirabel, Service d'Astrophysique, Centre d'Etudes de
Saclay; L. F. Rodriguez, Universidad Nacional Autonoma de Mexico;
J. Marti, Department of Astronomy and Meteorology, University of
Barcelona; R. Teyssier and J. Paul, Service d'Astrophysique, Centre
d'Etudes de Saclay; and M. Auriere, Observatoire du Pic du Midi,
communicate:  "Inside the 3'.5 SIGMA error radius (Cordier et al.,
Compton Symp., St. Louis) of this x-ray transient, discovered by
WATCH onboard GRANAT (IAUC 5590) and observed with a slow rise to
maximum intensity by BATSE on the Compton Observatory (IAUC 5619),
we have detected with the Very Large Array a radio-counterpart
candidate at R.A. = 19h12m49s.97, Decl. = +10 51'25".6 +/- 0".5 (
equinox 1950.0).  This source is time-variable:  on 1992 Dec. 11, the
20-cm peak flux was 2.5 +/- 0.1 mJy; on 1993 Mar. 10, it was 5.0
+/- 0.1 mJy.  R-band optical images obtained with the 2-m telescope
at Pic du Midi during Apr. 19 and 20 show no star brighter than mag
21 at the position of the compact radio source.  The nearest stars
are > 4" away from the radio counterpart.  Further radio observations
at higher frequencies, as well as infrared observations in
the H, J, and K bands, are in progress."


1993 April 23                  (5773)            Daniel W. E. Green

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