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IAUC 6884: GRB 980425; 1998 H1; 1998aq

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                                                 Circular No. 6884
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 980425
     P. Soffitta, M. Feroci, and L. Piro, Istituto Astrofisica
Spaziale, CNR, Rome; J. in 't Zand and J. Heise, Space Research
Organization of the Netherlands (SRON), Utrecht; L. Di Ciolo,
BeppoSAX Science Operation Center, Rome; J. M. Muller, BeppoSAX
Science Data Center, Rome, and SRON; and E. Palazzi and F. Frontera,
Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR,
Bologna, write: "The BeppoSAX Gamma-Ray Burst Monitor was triggered
by a gamma-ray burst on Apr. 25.90915 UT.  The gamma-ray burst
appears to be single-peaked and not structured.  A preliminary
analysis reveals a duration of about 30 s and a peak intensity of
350 counts/s in the energy band 40-700 keV.  The burst was also
detected in Wide Field Camera no. 2 with comparable duration and a
peak intensity of about 3 Crab (2-28 keV).  The position derived
by the WFC image is R.A. = 19h34m54s, Decl. = -52o49'.9 (equinox
2000.0), with an error radius of 8' that includes uncertainties
due to a non-optimum attitude control configuration.  A follow-up
observation with BeppoSAX narrow-field instruments is in progress."


COMET 1998 H1
     Additional precise positions:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Apr. 26.69787   15 27 37.49   +11 55 45.8   12.4   Sugie
          26.70065   15 27 36.37   +11 56 11.8            "
          26.70620   15 27 34.18   +11 57 02.9            "
          26.79369   15 27 00.29   +12 10 40.2          Ticha
          26.79503   15 26 59.75   +12 10 52.1            "
          26.79635   15 26 59.25   +12 11 05.0            "
          26.79700   15 26 59.03   +12 11 10.9            "
          26.79990   15 26 57.86   +12 11 39.0   12.5     "

A. Sugie (Dynic Astronomical Obs.).  0.60-m f/4.0 reflector + CCD.
  Tail at least 10' long toward south-southwest.
J. Ticha and M. Tichy (Klet).  0.57-m reflector + CCD.  Measurer
   Tichy.


SUPERNOVA 1998aq IN NGC 3982
     Precise position by G. Masi, Ceccano, Italy, for SN 1998aq
(cf. IAUC 6875):  R.A. = 11h56m25s.87, Decl. = +55o07'43".2
(equinox 2000.0).  R. Arbour, S. Wonston, England, reports the
following position end figures:  25s.76, 40".1.

                      (C) Copyright 1998 CBAT
1998 April 26                  (6884)            Daniel W. E. Green

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