Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6909: 1998cd; GRB 980515; 1998aq

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6908 SEARCH Read IAUC 6910

View IAUC 6909 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6909
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 1998cd IN ANONYMOUS GALAXY
     J. Mueller reports her discovery of an apparent supernova (mag
about 17.5) on a plate taken on May 17 with the 1.2-m Oschin
Schmidt Telescope in the course of the second Palomar Sky Survey.
R. Gal obtained a CCD frame on May 18 with the Palomar 1.5-m
telescope that confirms the presence of the object.  G. V.
Williams, Smithsonian Astrophysical Observatory, provides the
following reduction of positional measures by Mueller for SN 1998cd:
R.A. = 10h45m04s.16, Decl. = +39o25'12".5 (equinox 2000.0); this
corresponds to an offset 8".2 east and 5".8 south from the galaxy's
center.  The object does not appear on original Sky Survey prints
or on a IIIa-J Sky Survey plate taken on 1991 Feb. 9 by C. Brewer
and J. D. Mendenhall.


GRB 980515
     M. Feroci and L. Piro, Istituto Astrofisica Spaziale, CNR,
Rome; M. R. Daniele, G. Gennaro, S. Rebecchi, and G. Celidonio,
BeppoSAX Science Operation Center, Rome; L. A. Antonelli, BeppoSAX
Science Data Center, Rome; and J. Heise, Space Research
Organization of the Netherlands, Utrecht, report:  "The BeppoSAX
Wide Field Camera error box of GRB 980515 was observed with the
BeppoSAX Narrow Field Instruments (NFI) starting on May 16.1178 UT
(10 hr after the burst).  A previously unknown x-ray source, 1SAX
J2116.8-6712, was detected by the MECS instruments (units 2 and 3)
at R.A. = 21h16m49s, Decl. = -67o11'.8 (equinox 2000.0; preliminary
error radius 1'.5 due to the poor statistical quality).  This
position is 4'.9 from the centroid of the WFC position (GCN 73).
The source 1SAX J2116.8-6712 exhibits a moderate variability over
the two-day NFI observation.  There is no clear evidence for a
monotonic decaying behavior.  The average count rate was 0.0026 +/-
0.0006 count/s (2-10 keV) in the two MECS units, corresponding to
(1.6 +/- 0.4) x 10E-13 erg cmE-2 sE-1 (assuming a Crab-like energy
spectrum).  At this time, 1SAX J2116.8-6712 is the only candidate
for the x-ray afterglow of GRB 980515."


SUPERNOVA 1998aq IN NGC 3982
     CCD magnitude estimates, unfiltered unless otherwise noted:
May 7.862 UT, 12.9 (G. Masi, Ceccano, Italy); 8.915, V = 12.53 (D.
Hanzl, Brno, Czech Republic); 8.99, 12.8 (L. Boschini, Monte di
Nese, Bergamo, Italy); 9.898, 13.0 (Masi); 16.899, 13.3 (Masi).

                      (C) Copyright 1998 CBAT
1998 May 19                    (6909)            Daniel W. E. Green

Read IAUC 6908 SEARCH Read IAUC 6910

View IAUC 6909 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!