Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 1215

GRB011211: BeppoSAX/GRBM data
2002-01-07T18:45:54Z (22 years ago)
Filippo Frontera at ITESRE CNR <>
F.Frontera, Physics Dept. University of Ferrara, Ferrara and Istituto
Astrofisica Spaziale and Fisica Cosmica (IASF), CNR, Bologna; L. Amati,
IASF, CNR, Bologna; C. Guidorzi and E.  Montanari, Physics Dept,
University of Ferrara; E. Costa, M. Feroci, L.  Piro, IASF, CNR, Rome; J.
Heise, Space Research Organization Netherlands (SRON), Utrecht; and J.J.M.
in 't Zand, Astronomical Institute and SRON, Utrecht, report:

With reference to the GRB011211(=XRF011211) (GCN 1188, 1189), a detailed
analysis of the BeppoSAX GRBM data shows a very shallow long event in the
40-700 keV band with two peaks and a total duration of about 270 s,
similar to that measured in X-rays (2-28 keV)  with the BeppoSAX WFC. The
quick look analysis could not single out such long and faint signal. The
40--700 peak flux (with 8 s bins) is about 0.5 x10^-7~erg/cm^2 s, while
its fluence is about 5x10^-6 erg/cm^2.  The X/gamma fluence ratio is
similar to that found in a number of ordinary GRBs detected by BeppoSAX.
The distinguishing features of GRB011211 are its long duration (the
longest event localized with BeppoSAX) and its faintness both in X- and
gamma-rays. We conclude that this event cannot be classified as an X--ray
flash. From the measured redshift (z = 2.14, Fruchter et al. GCN 1200),
the gamma ray energy released, assuming isotropy, is 6.3x10^52 erg,
assuming a Friedman-Robertson-Walker cosmology with H0=65 Km/s Mpc and

This message can be cited.
Looking for U.S. government information and services? Visit