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IAUC 6307: GRO J1744-28; NGC 2363; 45P

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                                                  Circular No. 6307
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


GRO J1744-28
     D. A. Frail, Very Large Array (VLA), National Radio Astronomy
Observatory; C. Kouveliotou, Universities Space Research
Association; J. van Paradijs, University of Alabama at Huntsville
and University of Amsterdam; and R. Rutledge, Department of Physics,
Massachusetts Institute of Technology, report the detection of a
time-variable radio point source in the refined (IAUC 6291; Swank
and Strohmayer, private communication) XTE error box for GRO
J1744-28:  "We have observed the source at 3.6 cm with the VLA for
three days:  Feb. 2, 4, and 6 for 0.5, 0.4, and 1.0 hr, respectively.
Flux densities for these three days are < 170 +/- 55, 270 +/- 45,
and 540 +/- 30 mJy, respectively.  The source variability has been
monitored against a second radio source in the field that remained
constant during the same intervals.  The location of the variable
source is R.A. = 17h44m36s.83 +/- 0s.01, Decl. = -28o45'37".3 +/-
0".3 (equinox 2000.0); galactic coordinates l = 0o.03, b = +0o.28.
The probability of an unrelated extragalactic background source in
the 2.2-arcmin**2 error box is about 1 percent.  Further VLA
observations are planned."


NGC 2363
     L. Drissen and Y. Dutil, University of Laval; and R. Arsenault
and K. Barton, Canada-France-Hawaii Telescope (CFHT), report:  "We
have obtained images and spectra of the newly-discovered bright
variable star in NGC 2363 (IAUC 6294) with the CFHT (+ MOS imager/
spectrograph) on Feb. 7, under subarcsecond seeing conditions.
This star is still very bright (V about 18; Mv about -10.0).  Its
spectrum is characterized by a broad H-alpha line in emission
(broader than the nebular lines from the nearby H II region) and
narrow P-Cyg profiles of He I at 667.8, 587.6, and 492.1 nm.  These
spectral features, combined with the high luminosity of the star
and its large photometric variability, strongly suggest that this
is a luminous blue variable star in outburst."


COMET 45P/HONDA-MRKOS-PAJDUSAKOVA
     Total visual magnitude estimates: Jan. 27.51 UT, 8.3 (A. Hale,
Cloudcroft, NM, 10x50 binoculars; 15' coma); 30.19, 8.4 (K.
Hornoch, Lelekovice, Czech Republic, 0.35-m reflector); Feb. 1.43,
7.1 (J. E. Bortle, Stormville, NY, 10x50 binoculars; coma diameter
about 12'); 2.75, 7.0 (T. Lovejoy, Jimboomba, Queensland, Australia,
15x80 binoculars; coma diameter 30').

                      (C) Copyright 1996 CBAT
1996 February 9                (6307)            Daniel W. E. Green

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