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IAUC 5201: N Mus 1991; 1991 BB; 1991 CQ

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IAUC number 

                                                  Circular No. 5201
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 or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


NOVA MUSCAE 1991
     R. Sunyaev, E. Jourdain and A. Goldwurm on behalf of the SIGMA/
GRANAT Team (Space Research Institute, Moscow; Service d'Astrophysique,
Centre d'Etudes Nucleaires de Saclay; Centre d'Etude Spatiale
des Rayonnements, Toulouse) report:  "Further analysis of the Jan.
20-21 observation of Nova Mus 1991 (GRS 1124-684) with the SIGMA
telescope onboard GRANAT has shown that the transient spectral
feature reported on IAUC 5176 is compatible with a line near 500 keV.
The line width is consistent with the instrument spectral resolution
(about 40 keV at 500 keV).  The line flux is about 3 x 10E-3 photons
sE-1 cmE-2.  A clear excess (4.5 standard deviations), compatible
with the optical position of Nova Mus 1991, is visible in the image
derived in the 470- to 550-keV band during last 16 hr of observation
(i.e., when the line was detected).  The line was not detected
during the first third of the 24-hr observation, nor during the next
24-hr observation of this source on Feb. 1-2."


1991 BB
     Ephemeris from orbital elements on MPC 17833:

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Feb. 28     5 44.09    -24 55.9
     Mar.  5     5 36.58    -26 06.7    0.573    1.192    17.2
          10     5 31.05    -27 05.7
          15     5 27.15    -27 57.0    0.631    1.149    17.4
          20     5 24.57    -28 43.4
          25     5 23.03    -29 27.3    0.678    1.104    17.6
          30     5 22.27    -30 09.9
     Apr.  4     5 22.10    -30 52.0    0.709    1.060    17.7


1991 CQ
     Ephemeris from orbital elements on MPC 17835:

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Feb. 28     7 24.63    -16 28.1
     Mar.  5     7 35.27    -11 50.4    0.537    1.379    17.8
          10     7 46.40    - 7 21.7
          15     7 57.93    - 3 08.9    0.584    1.414    18.0
          20     8 09.77    + 0 42.5
          25     8 21.82    + 4 09.2    0.653    1.455    18.3


1991 February 28               (5201)             Daniel W. E. Green

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