Central Bureau for Astronomical Telegrams
IAUC 6315: GRO J1744-28; C/1996 B2
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Circular No. 6315
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. E. Vanden Berk, S. A. Severson, D. M. Cole, D. Q. Lamb, M.
C. Miller, R. C. Nichol, J. M. Quashnock, E. Bergeron, K. Gloria,
and D. Long, University of Chicago, report follow-up analyses
related to their discovery (IAUC 6310) of the optical/near-infrared
counterpart of the variable radio source (IAUC 6307) in the XTE
error box of GRO J1744-28: "During Feb. 5.534-5.582 UT, we carried
out optical observations of a region of the sky that included the
entire XTE error box (IAUC 6309) for GRO J1744-28, using the
Astrophysical Research Consortium's 3.5-m telescope at Apache Point
Observatory. A re-analysis of our data (using our own photometric
standards) shows that we reach limiting magnitudes g = 19.7 +/- 0.3
and r = 20.5 +/- 0.3. We see no new object or any significant
brightening of any known object to these limits, compared to the
COSMOS/NRL list and the European Southern Observatory (ESO) R copy
of the U.K. Schmidt photographic plate. We now measure r = 20.1
+/- 0.2 for the object reported by us on IAUC 6310 (we call this
'star a'). From an ESO 2.2-m IRAC2 K' image kindly provided by K.
Glazebrook, C. Lidman, and P. Blanco, and using the preliminary
photometric calibration provided by them, we measure K' = 13.1 +/-
0.3 for the source originally reported by us on IAUC 6310 (we call
this 'star A'). This is consistent with the value we reported
earlier. Our astrometric solution is based on four stars in the
COSMOS/NRL list that we are able to identify in all three passbands
(g, r, and K'). At the position of the radio source, we detect
nothing to the above limits in g and only one source (within 1") in
r, that being at R.A. = 17h44m36s.94, Decl. = -28o45'38".2 (equinox
2000.0) in the COSMOS/NRL reference frame (star a). In the ESO
IRAC2 K' image, we find four stars within 3" of the position of the
radio source and list them here in increasing distance from that
position (with R.A. and Decl. position end figures): star A,
36s.91, 37".8; star B, 36s.93, 35".9; star C, 36s.72, 38".5; star
D, 36s.87, 34".3."
COMET C/1996 B2 (HYAKUTAKE)
Total visual magnitude and coma diameter estimates: Feb. 12.18
UT, 8.6, - (J. M. Trigo, Castellon, Spain, 7x50 binoculars); 13.43,
8.6, 2'.0 (J. Bortle, Stormville, NY, 0.41-m reflector); 13.70, 7.9,
6' (T. Lovejoy, Jimboomba, Queensland, 15x80 binoculars); 14.45,
8.3, - (A. Hale, Cloudcroft, NM, 10x50 binoculars); 14.45, 7.7, 8'
(C. S. Morris, Pine Mountain Club, CA, 20x80 binoculars).
(C) Copyright 1996 CBAT
1996 February 16 (6315) Daniel W. E. Green
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