Circular No. 6321
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)
K-band photometry of stars A-D
P. Blanco, University of California, San Diego; C. Lidman,
European Southern Observatory (ESO); and K. Glazebrook, Anglo-
Australian Observatory, report photometry in the K band (2.2
microns) for objects in the vicinity of the radio-source candidate
for GRO J1744-28 (IAUC 6307, 6308): "These measurements were made
on a co-added image (600 s total exposure) taken on Feb. 8 UT at
the ESO 2.2-m telescope (+ IRAC2); this image provided the
preliminary K-band flux and source identifications reported on IAUC
6315. Using the same nomenclature, we have determined the
following K magnitudes: star A, 13.1; star B, 14.0; star C, 13.3;
star D, 11.3. At this wavelength, 0.0 mag corresponds to 620.0 Jy.
To aid calibration in the ongoing searches for near-infrared
variability, we also report magnitudes for three nearby isolated
stars in our image: R.A. = 17h44m34s.0, Decl. = -28o45'07" (equinox
2000.0), K = 11.86; position end figures 37s.3, 50", 11.75; 37s.6,
12", 11.88. Although our absolute fluxes have uncertainties of +/-
0.25 mag, photometry of sources A-D relative to these brighter
stars should be accurate to +/-0.1 mag, except for star B (+/-0.3
mag), which is faint and confused with star D."
For more information, see the
GROJ1744-28 WWW page.