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IAUC 6946: 1998cl; MICROLENSING EVENT; 1998bw

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                                                 Circular No. 6946
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)


SUPERNOVA 1998cl IN MARKARIAN 261
     A. V. Filippenko, D. C. Leonard, and M. Modjaz, University of
California at Berkeley; and R. G. Eastman, Lawrence Livermore
National Laboratory, report that CCD spectra (range 320-1000 nm)
obtained on June 18 UT with the Shane 3-m reflector at Lick
Observatory show that SN 1998cl (cf. IAUC 6934) is of type Ia,
roughly 2 weeks past maximum brightness.


MICROLENSING EVENT
     N. Palanque-Delabrouille, Centre d'Etudes de Saclay, on behalf
on the EROS collaboration (cf. IAUC 6609), reports on observations
of the second caustic crossing of the exotic gravitational
microlensing event in progress toward the Small Magellanic Cloud
(cf. IAUC 6935, 6939):  "The 40 data points collected at the
European Southern Observatory, La Silla, with the 1-m EROS
telescope span the period June 18.23-18.45 UT.  A linear decrease
of the flux by about a factor of 5 occurred until June 18.31,
followed by a slower rise by a factor of 2 in about 3 hr.  This is
compatible with the predictions made by both the MACHO and the
PLANET (cf. http://www.astro.rug.nl/~planet/index.html)
collaborations.  Light curves will be posted at our web site
http://www.lal.in2p3.fr/EROS/erosa.html as they become available."


SUPERNOVA 1998bw IN ESO 184-G82
     T. P. Dominici, R. Teixeira, and J. E. Horvath, Instituto
Astronomico e Geofisico (IAG), Universidade de Sao Paulo (USP); and
P. Holvorcem, Instituto de Matematica e Estatistica, Universidade
Estadual de Campinas, report:  "The possible optical counterpart
(IAUC 6895, 6901, 6903) for GRB 980425 (IAUC 6884) has been
observed at the IAG/USP Abrahao de Moraes Observatory (Valinhos,
Brazil).  Observations were performed with the 0.19-m Askania-Zeiss
Meridian Circle equipped with a CCD camera on May 9.2, 10.2, 12.2,
19.2, 20.2, and 22.2 UT.  Reduction of the whole data set using
specific astrometric techniques (Teixeira et al. 1992, A.Ap. 264,
307) has provided the position R.A. = 19h35m03s.310 +/- 0s.007,
Decl. = -52o50'44".65 +/- 0".05 (equinox J2000.0, FK5 reference
frame).  This refined position is remarkably close to that of the
radio transient reported by Tinney et al. (IAUC 6896)."

                      (C) Copyright 1998 CBAT
1998 June 18                   (6946)            Daniel W. E. Green

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