Central Bureau for Astronomical Telegrams
IAUC 6729: GRB 970828
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Circular No. 6729
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)
GRB 970828
A. V. Filippenko, D. Stern, and R. R. Treffers, University of
California at Berkeley; C. Y. Peng, University of Arizona; H. E.
Bond, Space Telescope Science Institute; and M. W. Richmond,
Rochester Institute of Technology, report that a total of ten R-
band images (size 5' x 5') centered on the nominal position of GRB
970828 (cf. IAUC 6726) were obtained on Aug. 29.3 UT at Lick
Observatory, using the 1-m Nickel Telescope and the 0.8-m Katzman
Automatic Imaging Telescope. No new objects brighter than the
limiting magnitude of the first Palomar Observatory Sky Survey
(digitized or photographic) are visible in the images, which span
the 90-percent-confidence ellipse given on IAUC 6728. The field
will be monitored for variable objects over the next week.
T. Murakami, Y. Ueda, and M. Ozaki, Institute of Space and
Astronautical Science; A. Yoshida and N. Kawai, Institute of
Physical and Chemical Research; M. Yamauchi, Miyazaki University;
and F. E. Marshall, R. H. D. Corbet, and T. Takeshima, Goddard
Space Flight Center, report on behalf of the ASCA team and the RXTE
Science Operations Team: "ASCA is observing the error box of GRB
970828 following the detection by RXTE's ASM and PCA (IAUC 6726,
6727, 6728) from Aug. 29.91 to 30.85 UT. A preliminary analysis of
about half of the total data set reveals an x-ray source that is
consistent with the combined error box of RXTE/ASM and IPN (IAUC
6728). The preliminary position of the x-ray source is R.A. =
18h08m30s, Decl. = +59o19'20" (equinox 2000.0; error radius 1'.5).
Analysis of the full data set after the attitude determination will
improve the position and reduce the error. The results will be
reported later."
E. Brocato, Osservatorio Astronomico Collurania (OAC), Teramo;
M. Stiavelli, Space Telescope Science Institute (STSI), European
Space Agency, and Scuola Normale Superiore, Pisa; and H. E. Bond
and K. Sahu, STSI, report that a total of four 30-min R and I band
CCD images (size 4'.5 x 4'.5), spaced to cover the 90-percent-
confidence ellipse at the position of GRB 970828 (IAUC 6728), were
obtained at the 0.7-m OAC telescope on Aug. 29.84-29.99 UT. No new
objects brighter than the limiting magnitudes of the first and
second Palomar Observatory Sky Surveys are visible in the images.
(C) Copyright 1997 CBAT
1997 August 30 (6729) Daniel W. E. Green
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