Central Bureau for Astronomical Telegrams
IAUC 6683: GRB 970616
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Circular No. 6683
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
GRB 970616
V. Connaughton, National Academy of Sciences/National Research
Council and Marshall Space Flight Center (MSFC); R. M. Kippen, R.
Preece, and G. N. Pendleton, University of Alabama at Huntsville
and MSFC; and S. D. Barthelmy, Universities Space Research
Association (USRA) and Goddard Space Flight Center (GSFC), report
for the BATSE team: "The transient x-ray XTE source reported below
by Marshall et al. lies in the error box of a gamma-ray burst seen
by BATSE on June 16.757 UT. The Rapid Burst Reponse location,
which was distributed through the GRB Coordinates Network/BATSE
Coordinates Distribution Network, 20 min after the initial trigger,
was R.A. = 1h21m51s, Decl. = -7 09'.4 (equinox 2000.0), with a
1-sigma error radius of 0.3-degree statistical and about 2 deg
systematic. The burst was multipeaked, with a total duration of
about 200 s. A maximum flux of 23.8 +/- 0.5 photons cmE-2 sE-1
(above 20 keV) was measured 90 s after the trigger time, placing
this event in the brightest 2 percent of all BATSE bursts. Its
total fluence above 20 keV is estimated to be 4.01 +/- 0.14 x 10E-5
erg cmE-2."
F. E. Marshall, GSFC; T. Takeshima, and S. D. Barthelmy, USRA
and GSFC; C. R. Robinson, USRA and MSFC; and K. Hurley, University
of California at Berkeley, report the detection of an x-ray
afterglow for the gamma-ray burst detected with BATSE on June
16.7568 UT. Scanning observations with the Proportional Counter
Array on the Rossi X-ray Timing Explorer (RXTE) 4.0 hr after the
burst revealed a source at R.A. = 1h18m.9 +/- 0m.7 (90-percent
statistical confidence), Decl. = -5 30' +/- 18' (equinox 2000.0)
with a countrate of 4.5 +/- 1.6 counts/s or 1.1 x 10E-11 erg sE-1
cmE-2 in the band 2-10 keV. It is the brightest source detected
within the 2-deg BATSE error circle, and it also overlaps the
preliminary inter-planetary network (IPN) annulus determined from
the time difference in the BATSE and Ulysses detections. The IPN
annulus has a radius of 49.808 deg, is centered at R.A. =
22h10m30s, Decl. = -27o24'.8, and has a full width of 4'.6. An
annulus with a smaller width will be available after further
processing. The intersection of the error regions has corners at
1h19m.6, -5 49'; 1h19m.6, -5 40'; 1h18m.4, -5 12'; 1h18m.2, -5 16'.
A subsequent RXTE observation on June 18.08 detected no significant
flux from this position, with a preliminary 90-percent confidence
upper limit of 2.5 counts/s.
(C) Copyright 1997 CBAT
1997 June 19 (6683) Daniel W. E. Green
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