Central Bureau for Astronomical Telegrams
IAUC 7211: GRB 990627; 1999cw; N IN NGC 6822
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Circular No. 7211
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
GRB 990627
J. M. Muller, Space Research Organization of the Netherlands
(SRON), Utrecht, and BeppoSAX, Rome; E. Costa and G. Gandolfi,
Istituto Astrofisica Spaziale, CNR, Rome; M. Dadina, A. Paolino, R.
Ricci, and A. Tesseri, BeppoSAX, Rome; and J. Heise and J. J. M. in
't Zand, SRON, report on behalf of the BeppoSAX team: "A gamma-ray
burst with x-ray counterpart has been detected by the BeppoSAX
Gamma Ray Burst Monitor (GRBM) and Wide Field Camera 2 (WFC2) on
June 27.20894 UT. A preliminary analysis of the GRBM data reveals
a multiple-peak gamma-ray burst lasting about 50 s with a peak
intensity of 280 counts/s in 1 s timebins in the energy band 40-700
keV. A simultaneous x-ray counterpart was observed by the WFC2
with a duration of about 60 s, a complex lightcurve, and peak and
mean fluxes of about 0.3 and 0.1 Crab (2-9 keV), respectively. The
position of the counterpart resulting from an off-line analysis is
R.A. = 1h48m25s, Decl. = -77o05'.3 (equinox 2000.0), with an error
radius of 3'. A follow-up observation with the BeppoSAX narrow-
field instruments is in progress since June 27.55. Observations in
all bands are solicited. The SIMBAD database
(http://cdsweb.u-strasbg.fr/Simbad.html#inter) mentions a star of
mag 9.9 within the error circle."
SUPERNOVA 1999cw IN MCG -01-02-001
R. Johnson and W. D. Li, University of California at Berkeley,
on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627,
7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of an apparent supernova on unfiltered
images taken on June 28.5 and 29.5 UT, both with mag about 14.2.
The new object is located at R.A. = 0h20m01s.46, Decl. =
-6o20'03".6 (equinox 2000.0), which is 21".1 east and 1".5 south of
the nucleus of MCG -01-02-001. A KAIT image of the same field on
1998 Aug. 15.5 (limiting magnitude about 19.0) showed nothing at
the position of SN 1999cw.
NOVA IN NGC 6822
G. Bakos, Space Telescope Science Institute, and the PLANET
collaboration report that 420- and 360-s V-band images of the
apparent nova in NGC 6822 (IAUC 7208 and 7209) were taken with the
1.0-m telescope at Sutherland Observatory on June 26 and 28,
respectively, yielding the following derived magnitudes (based on
USNO-A1.0 R magnitudes): June 26.082 UT, V = 19.0 +/- 0.1; 28.074,
19.6 +/- 0.1.
(C) Copyright 1999 CBAT
1999 June 29 (7211) Daniel W. E. Green
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