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IAUC 6559: PSR J0633+1746; GRB 970111

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                                                 Circular No. 6559
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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PSR J0633+1746
     A. D. Kuzmin and B. Y. Losovsky, Lebedev Physical Institute,
Moscow, report a radio detection of the pulsar PSR J0633+1746
(Geminga) with period 0.237 s.  A flux density of about 0.1 Jy at
frequency 102 MHz, corresponding to a spectral index of > 1.7, and
a dispersion measure of 3 +/- 1 pc cmE-3 was determined.  The width
of the integrated profile at 50 percent of peak intensity, W50, is
80 deg of the total pulse phase; W10 = 130 deg.  There is
apparently an interpulse of 0.2 of the main pulse intensity spaced
by about 190 deg.

GRB 970111
     S. R. Kulkarni and M. R. Metzger, California Institute of
Technology; and D. A. Frail, National Radio Astronomy Observatory,
report the following in regard to the radio source reported on IAUC
6545 (now denoted as VLA J1528.7+1945) and located in the reduced
error box (Hurley et al., IAUC 6545) of GRB 970111: "On Jan. 16 UT,
imaging and spectroscopic observations at optical wavelengths of
this localization region were obtained using the Keck II 10-m
telescope.  Two sources, S1 and S2, are identified to lie within 1"
of VLA J1528.7+1945; their R magnitudes are 20.8 and 21.3,
respectively.  S1 is a slightly extended galaxy with a strong blue
continuum and a redshift of 0.636 (as inferred from the Balmer and
Ca II absorption features).  S2 is a galaxy located 2".15 east and
1".06 north of S1.  The redshift of S2, based on absorption and [O
II] 372.8-nm emission features, is 0.458."
     A. Guarnieri, C. Bartolini, and A. Piccioni, University of
Bologna; and N. Masetti, University of Padua, communicate:  "Using
the Bologna University 1.5-m telescope on Jan. 15.19, 17.19, and
31.15 UT, we observed an object with a mean mag of R = 20.6 +/- 0.1
that is practically coincident with the position of the radio
source detected by Frail et al. (IAUC 6545).  Some indication of
variability on a 2-day time scale (to be confirmed) was present.
The object is barely visible in our V frame (V-R about 0.0) and is
invisible in the B band (B > 21); this would indicate a reddened
blue object.  On the Palomar plates (epoch 1950.294), the object is
undetectable in B and is about at the same R luminosity level
stated above.  The coincidence of the radio source with this
optical object suggests the latter as the probable optical
counterpart of both the x-ray and radio sources."

                      (C) Copyright 1997 CBAT
1997 February 15               (6559)            Daniel W. E. Green

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