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GRBCATIRR: Help

GRBCATIRR - Gamma-Ray Bursts Catalog: Irregular Regions


Overview

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

References for the individual records in this table are available in the "reference" field of the GRBCAT main table.

Provenance

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.

Parameters

Record_Number
This is a numerical value that uniquely identifies a record within this database.

Id
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.

Name
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 character string.

Irr_Circle_RA
This is the Right ascension of the most likely position center of the COMPTEL error circle given in units of degrees.

Irr_Circle_Dec
This is the Right ascension of the most likely position center of the COMPTEL error circle given in units of degrees

Irr_Circle_Radius
This is the radius corresponding to 1 sigma confidence region derived from COMPTEL given in units of degrees.

Irr_RA
This is the Right ascension of the combined COMPTEL and IPN most likely localization given in units of degrees.

Irr_Dec
This is the Declination of the combined COMPTEL and IPN most likely localization given in units of degrees.

Irr_Arc_Length
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.

Irr_Arc_Width
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 parameter.

Irr_Spacecraft
This lists the spacecrafts used in determining the position, where C=CGRO(BATSE), U=Ulysses, P=Pioneer Venus Orbiter and M=Mars Observer.

Local_Notes
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.


Contact Person

Questions regarding the GRBCATIRR database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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