[vsnet-grb-info 5060] GRB 070824 - Combined SuperAGILE/IPN
Localization
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Aug 31 02:46:10 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6767
SUBJECT: GRB 070824 - Combined SuperAGILE/IPN Localization
DATE: 07/08/30 17:46:04 GMT
FROM: Marco Feroci at IASF/INAF <feroci at iasf-roma.inaf.it>
Combined SuperAGILE/IPN Localization of the long and bright GRB 070824
I. Donnarumma, E. Del Monte, F. Lazzarotto, M. Feroci, A. Giuliani,
M. Marisaldi, on behalf of the AGILE Team,
B. Preger, on behalf of the AGILE Science Data Center,
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov and T. Cline on behalf of the Konus-Wind and Konus-A
teams,
K. Hurley on behalf of the IPN Teams,
J. Cummings, D. Palmer and H. Krimm, on behalf of the Swift/BAT team,
D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas,
and A. Zehnder, on behalf of the RHESSI GRB team,
report:
GRB 070824 triggered the SuperAGILE ground software trigger on 24
August 2007, at 20:50:09 UT. The GRB was seen as a 3 s long event,
preceded by a weaker 2 s precursor 5 s earlier. The SuperAGILE T90 for
this event was 9.5 s. The event was observed by SuperAGILE at 48.1 deg
off-axis, which is in a region of the instrument field of view with only
one-dimensional imaging. In spite of this, the event was observed on all
SuperAGILE detectors; due to its hardness, it passed through the
collimator shields. In addition, its arrival direction was partially
obscured by the Earth's atmosphere for AGILE. For these reasons, the event
was imaged by SuperAGILE with only 4.6 sigma significance. The
SuperAGILE-only error box is thus a long, narrow strip, limited by the
instrument field of view and Earth occultation in one direction and by the
imaging uncertainty in the other. For the latter we assumed a 20 arcmin
error radius, including statistics and systematics, due to the low
statistics of the detection and the far off-axis position. The resulting
error box is:
RA Dec
===============
172.281 -27.240
171.938 -26.648
147.942 -34.944
148.056 -34.281
The SuperAGILE light curve may be found at the AGILE Science Data Center
and AGILE-Team web pages.
This event was independently detected by other IPN experiments, namely
Konus-Wind, Swift/BAT, RHESSI, AGILE/Minicalorimeter, and the
AGILE/Anticoincidence, as well as by Konus-A (Cosmos-2421). Their
detection combined to provide further constraints to the burst
localization, as shown in the figure at
www.ssl.berkeley.edu/ipn3/070824.
The final localization of GRB 070824 is thus limited by the
corners of a triangular area:
RA Dec
==================
1: 172.055 -26.864
2: 171.188 -27.715
3: 172.281 -27.240
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