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IAUC 6323: NOVALIKE Var IN Sgr; GRO J1744-28; C/1996 B2

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                                                  Circular No. 6323
Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)

     S. Nakano, Sumoto, Japan, forwards the following precise
position from Y. Kushida, Yatsugatake South Base Observatory,
obtained on Feb. 23.792 UT with a 0.25-m reflector (+ CCD):  R.A. =
17h52m32s.69, Decl. = -17o41'07".7 (equinox 2000.0).

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:  "We have continued
to monitor the time-variable radio source in the XTE error box of
GRO J1744-28 (cf. IAUC 6309).  Observations with the VLA at 3.6 cm
were made on Feb. 12, 13, 16, and 17 for 5, 60, 22, and 15 min,
respectively.  Flux densities for these four days are < 345 +/- 115,
< 195 +/- 65, < 165 +/- 55, and 300 +/- 55 microJy, respectively.
It is clear from these and our earlier measurements (IAUC 6307) that
the variations in the radio flux density are not due to a gradual
rise or decay of a synchrotron source, but they appear to be
stochastic.  A weighted average of all three detections results in a
location for the time-variable radio source of R.A. = 17h44m36s.820
+/- 0s.008, Decl. = -28o45'37".38 +/- 0".17 (equinox 2000.0), in
close agreement with the position given on IAUC 6307.  The radio
source is offset 0".6 from the optical candidate identified on an
ESO R plate (IAUC 6314) and 1".7 from star C (and star a) identified
by Vanden Berk et al. (IAUC 6315) and Miller (IAUC 6318).  We
estimate that systematic errors (if any) in the VLA measurements can
account for no more than 0".15 of this discrepancy."

     Total visual magnitude estimates (cf. IAUC 6315):  Feb. 16.69
UT, 7.6 (T. Lovejoy, Jimboomba, Queensland, 15x80 binoculars);
18.21, 7.9 (A. Pereira, Cabo da Roca, Portugal, 9x34 binoculars);
20.29, 7.4 (J. G. de S. Aguiar, Campinas, Sao Paulo, Brazil, 11x80
binoculars); 21.30, 7.1 (G. W. Kronk, Troy, IL, 20x80 binoculars);
22.24, 7.4 (Pereira; 1 deg tail in p.a. 320 deg); 23.44, 7.4 (A.
Hale, Cloudcroft, NM, 10x50 binoculars).

                      (C) Copyright 1996 CBAT
1996 February 23               (6323)            Daniel W. E. Green

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