GRBCATIRR - Gamma-Ray Bursts Catalog: Irregular Regions
This table is an associated to the GRBs Catalog and lists the
parameters that define an 'irregular' region as the localization region. For a
given GRB the localization can be provided by different observatories with
different region types or by the same region type with different parameters.
The different region types reported in literature are the following: circle,
annulus, box, dual, annulus intersect, irregular, and intersect.
This table contains the description only for the irregular region type, the
other types are stored in separate tables. The 'irregual' region are from the
Kippen et al. (1998).
This localization region consist of a short thin arc segment derived from a
COMPTEL localization combined with an IPN localization where the most likely
position corresponds to the maximum obtained from the integral distribution.
The COMPTEL localization consists of a circle error region centered at the most
likely position within that region.
The measurements are reported as found in literature and any differences or
remarks are included in one of the table parameter (local_notes).
The literature references are provided in the GRBs Catalog main table which is
linked to this region table.
References for the individual records in this table are available
in the "reference" field of the GRBCAT main table.
This table was ingested by the HEASARC in June 2008 based on electronic
versions obtained from the author(s), who compiled the catalog in 2005.
This is a numerical value that uniquely identifies a record
within this database.
This is a unique numerical value assigned to each GRB. Since for a given
GRB there can be more that one record, this numerical value is assigned to all
record associated to a specific GRB.
This is the name of the GRB. The name are assigned following the "GRB
YYMMDD" or "GRB YYMMDDn" if multiple bursts occur within a day, where n is a
This is the Right ascension of the most likely position center
of the COMPTEL error circle given in units of degrees.
This is the Right ascension of the most likely position
center of the COMPTEL error circle given in units of degrees
This is the radius corresponding to 1 sigma confidence
region derived from COMPTEL given in units of degrees.
This is the Right ascension of the combined COMPTEL and IPN most
likely localization given in units of degrees.
This is the Declination of the combined COMPTEL and IPN most likely
localization given in units of degrees.
This is the mean 68 percent error in the angular distance
along the arc as measured given in units of degrees from the most likely
position. The length of the thin arc segment is on average 2x this parameter.
This is the uncertainty in the arc width as determined by the
IPN given in units of degrees. The width of the thin arc segment is 2x this
This lists the spacecrafts used in determining the position,
where C=CGRO(BATSE), U=Ulysses, P=Pioneer Venus Orbiter and M=Mars Observer.
This field contains notes regarding the localization of the GRB.
This is filled to explain how the values reported in the database are compared
with the values reported in the literature.
Questions regarding the GRBCATIRR database table can be addressed to the
HEASARC User Hotline.
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