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IAUC 7303: 1999el; XTE J1859+226; GRB 991105; 1999em

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IAUC number

                                                  Circular No. 7303
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1999el IN NGC 6951
     C. C. Dudley and J. Fischer, Naval Research Laboratory,
Washington, report near-infrared observations of SN 1999el obtained
with the U.S. Naval Observatory 1.55-m telescope (+ ASTROCAM
1024x1024 ALADDIN InSb imager) at Flagstaff on Oct. 26.15 UT:  "A
K' position, calibrated from the positions of more than 20 USNO-
A2.0 stars within the 6' field-of-view of the imager, is R.A. =
20h37m17s.72, Decl. = +66o06'11".5 (equinox 2000.0).  The K' and J
magnitudes are estimated to be 12.7 and 13.6, respectively (each
with an uncertainty of 0.2 mag).  Flux calibration is based on the
stars in field AS40 reported by Hunt et al. (1998, A.J. 115, 2594),
observed within 0.1 airmass of the supernova.  The present
estimates include contributions from two nearby foreground stars
(see IAUC 7288), contributing at the 5-15-percent level.
Contributions from NGC 6951 appear to be well subtracted by making
use of the symmetry of the galaxy in these passbands with respect
to rotation by 180 deg about the nucleus."

XTE J1859+226
     M. Uemura and T. Kato, Kyoto University; and E. Pavlenko,  S.
Shugarov, and M. Mitskevich, Crimean Astrophysical Observatory,
communicate:  "CCD photometry of the optical counterpart of XTE
J1859+226 (IAUC 7274, 7276) with the 0.25-m and 0.38-m telescopes
at Kyoto and Crimea revealed likely orbital modulations with a
period of 0.2806 day and an amplitude of 0.10 mag.  The variations
were present on Oct. 20-26, and possibly on Oct. 17, which makes
this the earliest detection of such signals among x-ray novae (cf.
IAUC 5259, 5692)."

GRB 991105
     M. J. S. Smith et al. inform us that the position on IAUC 7301
requires correction by 4'.4 to R.A. = 12h03m29s, Decl. = -66o45'24"
(equinox 2000.0).

SUPERNOVA 1999em IN NGC 1637
     CCD magnitudes, unfiltered unless otherwise noted:  Nov. 1.000
UT, 13.9 +/- 0.2 (K. Sarneczky and L. Kiss, Szeged, Hungary); 1.033,
V = 14.32 +/- 0.03 (D. Hanzl, Brno, Czech Republic).

                      (C) Copyright 1999 CBAT
1999 November 6                (7303)            Daniel W. E. Green

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