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IAUC 5880: SGR 1806-20; V1974 Cyg; NOTICE TO SUBSCRIBERS; N Aql 1993

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                                                  Circular No. 5880
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SGR 1806-20
     Y. Tanaka, Institute of Space and Astronautical Science, on
behalf of the ASCA Team, communicates: "Following the notice of new
activity of SGR 1806-20 (IAUC 5875), we observed the source with
ASCA between Oct. 9.67 and 11.58 UT.  Quick-look data show an
anomalous increase of counts (burst) in a 4-s time bin, which includes
the time of occurrence of a gamma-ray burst (at Oct. 9.934) detected
by the BATSE instrument on the Compton Gamma Ray Observatory
from SGR 1806-20 (private communication by C. Kouveliotou).  We
discovered in the same observation a new x-ray source at R.A. =
18h05m42s, Decl. = -20o25'10" (equinox 1950.0), with an error-circle
radius of 1', coincident with a radio source reported on IAUC
5879.  The source intensity is about 0.2 mCrab (0.5-10 keV) with a
heavy absorption.  Preliminary analysis localized the position of
the ASCA burst into a cell of 3' x 6', which includes the new x-ray
source.  We tentatively identify this radio/x-ray source to be the
counterpart of SGR 1806-20."


V1974 CYGNI
     J. A. DeYoung and R. E. Schmidt, U.S. Naval Observatory,
report: "Time-resolved Kron-Cousins I-band photometry of V1974 Cyg
(N Cyg 1992) on Oct. 6.99-7.08, 7.98-8.15, 10.98-11.15, and 12.98-
13.18 UT shows a modulation with a period of 1.95 hr and a peak-to-
peak amplitude of 0.16 +/- 0.02 magnitude.  A linear least-squares
fit using the seven times of observed minima gives a period of
0.08123 +/- 0.00003 day."


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NOVA AQUILAE 1993
     Further CCD photometry by H. Mikuz, Ljubljana, Slovenia (cf.
IAUC 5818, 5838):  Aug. 21.91 UT, V = 13.93 +/- 0.05; Oct. 4.81,
13.29 +/- 0.05.


1993 October 15                (5880)            Daniel W. E. Green

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