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IAUC 6913: GRB 980519; C/1998 J1

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                                                 Circular No. 6913
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


GRB 980519
     A. Maury and D. Albanese, Observatoire de la Cote d'Azur
(OCA); M. Boer, Centre d'Etude Spatiale des Rayonnements, CNRS; and
M. Feroci, Istituto Astrofisica Spaziale, CNR, report: "We obtained
images of the field of GRB 980519 (IAUC 6909, 6910, 6912) on May 19
and 20 with the OCA 0.90-m Schmidt telescope.  The optical
transient reported by Jaunsen et al. (GCN 78) is clearly detected
and fading on unfitered exposures taken on May 19.86256, 20.07652,
and 20.96426 UT, at which time we measure magnitudes 19.06 +/-
0.26, 19.81 +/- 0.37, and 22.06 +/- 0.76, respectively.  The power-
law slope decline is roughly 2.0, which, given the uncertainties,
is consistent with the value reported by Djorgovski et al. (GCN
79).  The images and the light curve are available at
http://wwwrc.obs-azur.fr/schmidt/980519.html."


COMET C/1998 J1 (SOHO)
     Improved parabolic orbital elements from MPEC 1998-K11:

     T = 1998 May   8.616 TT          Peri. = 110.563
                                      Node  = 351.636   2000.0
     q = 0.15324 AU                   Incl. =  62.894

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
May  21     5 23.57   + 3 16.9   0.843   0.482   28.3   95.8    4.5
     23     5 37.14   - 0 41.8   0.849   0.539   32.1   90.9    5.0
     25     5 49.76   - 4 26.1   0.861   0.594   35.8   86.2    5.4
     27     6 01.59   - 7 55.0   0.877   0.647   39.2   81.8    5.8
     29     6 12.78   -11 08.2   0.897   0.700   42.4   77.7    6.2
     31     6 23.39   -14 06.3   0.920   0.750   45.3   73.9    6.6
June  2     6 33.52   -16 50.0   0.947   0.800   48.0   70.4    6.9
      4     6 43.21   -19 20.3   0.975   0.848   50.4   67.2    7.2
      6     6 52.52   -21 38.4   1.005   0.895   52.6   64.2    7.5

     Visual m_1 estimates (B = binoculars):  May 17.35 UT, 2.8 (F.
Farrell, Christies Beach, S. Australia, 7x50 B); 18.38, 3.5 (M.
Mattiazzo, Adelaide, S. Australia, 7x50 B); 18.86, 3.7 (J. G. de S.
Aguiar, Campinas, Brazil, 11x80 B); 19.68, 3.8 (T. Cooper, Bredell,
Kempton Park, South Africa, 10x50 B); 20.91, 4.5 (N. Falsarella,
Sao Jose do Rio Preto, Brazil, 7x50 B); 22.37, 4.5 (R. H. McNaught,
Bugaldie, N.S.W., naked eye).

                      (C) Copyright 1998 CBAT
1998 May 22                    (6913)            Daniel W. E. Green

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