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IX/20A The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)
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The Fourth BATSE Burst Catalog (Revised)
Paciesas W.S., Meegan C.A., Pendleton G.N., Briggs M.S., Kouveliotou C.,
Koshut T.M., Lestrade J.P., McCollough M.L., Brainerd J.J., Hakkila J.,
Henze W., Preece R.D., Connaughton V., Kippen R.M., Mallozzi R.S.,
Fishman G.J., Richardson G.A., Sahi M.
<Astrophys. J. Suppl. Ser. 122, 465 (1999)>
=1999ApJS..122..465P
The Ulysses supplement to the BATSE 4Br catalog of cosmic gamma-ray bursts.
Hurley K., Briggs M.S., Kippen R.M., Kouveliotou C., Meegan C.,
Fishman G., Cline T., Boer M.
<Astrophys. J. Suppl. Ser. 122, 497 (1999)>
=1999ApJS..122..497H
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ADC_Keywords: Gamma rays
Mission_Name: CGRO
Description:
This is the fourth catalogue of the BATSE instrument on board of the
Compton Gamma-ray Observatory (CGRO), launched on April 5, 1991. It
contains the locations and times for 1637 triggered gamma-ray bursts
(nominal energy range 50-300keV) observed from 19 April, 1991 until 29
August, 1996. This 4Br version has been revised from the version first
circulated on CD-ROM in September 1997 (4B, file "4b.dat") to include
improved locations for a subset of bursts that have been reprocessed
using additional data.
The Interplanetary Network (IPN) localization information for 147
gamma-ray bursts observed by the Burst and Transient Source Experiment
between the end of the Third BATSE catalog and the end of the Fourth
BATSE catalog, obtained by analyzing the arrival times of these bursts
at the Ulysses and Compton Gamma-Ray Observatory (CGRO) spacecraft.
are included in the table "ulysses.dat".
Bursts found later (1607 triggers until 9 September 2000) are included
in the file "grb.dat"; the data related to these events (those having
a TrigNo>=5589) should be considered as preliminary.
The Exposure table and Trigger Criteria tables are not included here;
please consult the statistical results on the BATSE pages
(http://gammaray.msfc.nasa.gov/batse/)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
4br.dat 88 1637 Basic 4Br catalogue (until 29-Aug-1996)
grb.dat 88 1067 Gamma-ray bursts observed until 09-Sep-2000
4brcom.dat 89 3061 Comments (on 4Br bursts only)
duration.dat 52 2041 Duration table (on all gamma-ray bursts)
flux.dat 164 2135 Flux values for BATSE triggers
maxmin.dat 46 1323 Peak and threshold count rates
ulysses.dat 34 147 Ulysses/BATSE annuli localisations
4b.dat 88 1637 1997 version of the basic 4B catalogue.
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See also:
http://gammaray.msfc.nasa.gov/batse/ : the BATSE home page
Byte-by-byte Description of file: 4br.dat grb.dat 4b.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/8121] The BATSE trigger number
6- 16 A11 --- 4B The BATSE burst name (based on observation date)
17 A1 --- Uflag [*] when the burst is in the Ulysses supplement
19- 27 F9.1 d JD The Julian Date (TJD) of the trigger
29- 37 F9.3 s Time *[0,86400[ The time in decimal seconds of day (UT)
of the trigger
39- 45 F7.3 deg RAdeg Right ascension (J2000) in decimal degrees
47- 53 F7.3 deg DEdeg Declination (J2000) in decimal degrees
55- 61 F7.3 deg GLON Galactic longitude in decimal degrees
63- 69 F7.3 deg GLAT Galactic latitude in decimal degrees
71- 76 F6.3 deg PosErr *Radius in decimal degrees of positional error box
78- 84 F7.3 deg Angle *Angle in decimal degrees of geocenter
86 A1 --- PrevFlag [YN] Overwrite flag: Y(true) if this burst
overwrote an earlier, weaker trigger.
N(false) otherwise
88 A1 --- NextFlag [YN] Overwritten flag: Y(true) if this burst was
overwritten by a later, more intense trigger.
N(false) otherwise
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Note on PosErr:
The error in angular location is the radius of a circle having the
same area as the 68% confidence ellipse defined by the formal
covariance matrix from a {chi}^2^ fit on the assumption of normal
errors.
The positional error is reduced when the Uflag is set, see the file
"ulysses.dat"
Note on Angle: The angle between the burst and the nadir, as measured
from the satellite
Note on Time:
The burst trigger time is the end of the interval (64, 256 or 1024ms)
on which the burst triggered the detector.
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Byte-by-byte Description of file: 4brcom.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/8121] BATSE trigger number
6 A1 --- Flag *[QAOLT] Comment flag
8- 86 A79 --- Text Comment
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Note on Flag: the letter indicates a comment category:
Q : comments on data quality
A : additional observations by other instruments
O : general comments
L : comments on the gamma-ray burst coordinates
T : comments on the gamma-ray burst duration
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Byte-by-byte Description of file: duration.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/8121] The BATSE trigger number.
6- 12 F7.3 s T50 *T50, interval covering 50% of the counts
14- 19 F6.3 s e_T50 Uncertainty in T50
21- 28 F8.3 s T50start *The start time of the T50 interval, relative
to the trigger time in table 4br.dat
29- 36 F8.3 s T90 *T90, interval covering 90% of the counts
38- 43 F6.3 s e_T90 Uncertainty in T90
45- 52 F8.3 s T90start *The start time of the T90 interval, relative
to the trigger time in table 4br.dat
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Note on T50: T50 measures the duration of the time interval during which
25% to 75% of the total observed counts have been detected, using data
summed over the 4 LAD discriminator channels and using data summed
over only those detectors that satisfied the BATSE trigger criteria.
Note on T50start: the start of the T50 interval is defined by the time at
which 25% of the total counts have been detected, and the end of the
T50 interval is defined by the time at which 75% of the counts have
been detected.
Note on T90: T90 measures the duration of the time interval during which
5% to 95% of the total observed counts have been detected, using data
summed over the 4 LAD discriminator channels and using data summed
over only those detectors that satisfied the BATSE trigger criteria.
Note on T90start: the start of the T90 interval is defined by the time at
which 5% of the total counts have been detected, and the end of the
T90 interval is defined by the time at which 95% of the total counts
have been detected.
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Byte-by-byte Description of file: flux.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/8121] BATSE trigger number
6- 15 E10.4 mJ/m2 F1 Fluence for channel 1 (20-50 keV)
17- 26 E10.4 mJ/m2 e_F1 Error in F1 (one-sigma)
28- 37 E10.4 mJ/m2 F2 Fluence for channel 2 (50-100 keV)
39- 48 E10.4 mJ/m2 e_F2 Error in F2 (one-sigma)
50- 59 E10.4 mJ/m2 F3 Fluence for channel 3 (100-300 keV)
61- 70 E10.4 mJ/m2 e_F3 Error in F3 (one-sigma)
72- 81 E10.4 mJ/m2 F4 *Fluence for channel 4 (E > 300 keV)
83- 92 E10.4 mJ/m2 e_F4 Error in F4 (one-sigma)
94-101 F8.3 ct/cm2/s F64ms *Peak flux on the 64ms time scale
103-107 F5.3 ct/cm2/s e_F64ms *Error in F64ms (one-sigma)
109-116 F8.3 s T64ms *Time of F64ms
118-125 F8.3 ct/cm2/s F256ms *Peak flux on the 256ms time scale
127-131 F5.3 ct/cm2/s e_F256ms *Error in F256ms (one-sigma)
133-140 F8.3 s T256ms *Time of F256ms
142-149 F8.3 ct/cm2/s F1024ms *Peak flux on the 1024 time scale
151-155 F5.3 ct/cm2/s e_F1024ms *Error in F1024ms (one-sigma)
157-164 F8.3 s T1024ms *Time of F1024ms
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Note on T64ms, T256ms, T1024ms: The peak flux times are expressed in
decimal seconds relative to the burst trigger time for the end of the
interval in which the flux was calculated.
Note on F64ms, F256ms, F1024ms: The peak flux energy range is 50-300 keV,
coinciding with the energy range of the nominal BATSE on-board burst
trigger.
Note on e_F64ms, e_F256ms, e_F1024ms: truncated to 9.999 for trigger 6238.
Note on F4: since channel 4 is an integral channel, fluences given for
this channel are quite sensitive to the assumed spectral form.
Spectral analyses in this energy range should be performed with higher
resolution data types. Many of the bursts between March 1992 and March
1993 have significant gaps in the data and are not included in the
table.
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Byte-by-byte Description of file: maxmin.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/8121] BATSE trigger number
6- 13 F8.3 --- CMax64 ?=-999.000 Maximum counts in the second most
brightly illuminated detector divided by the
threshold count rate on the 64ms timescale
15- 18 I4 ct T64 ?=-999 Trigger threshold on the 64ms timescale.
It is the number of counts in 64ms required
to trigger the second most brightly illuminated
detector for this particular burst (1)
20- 27 F8.3 --- CMax256 ?=-999.000 Maximum counts in the second most
brightly illuminated detector divided by the
threshold count rate on the 256ms timescale.
29- 32 I4 ct T256 ?=-999 Trigger threshold on the 256ms timescale.
It is the number of counts in 256ms required
to trigger the second most brightly illuminated
detector for this particular burst (1)
34- 41 F8.3 --- CMax1024 ?=-999.000 Maximum counts in the second most
brightly illuminated detector divided by the
threshold count rate on the 1024ms timescale.
43- 46 I4 ct T1024 ?=-999 Trigger threshold on the 1024ms timescale.
It is the number of counts in 1024ms required
to trigger the second most brightly illuminated
detector for this particular burst (1)
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Note (1): since a trigger can occur on any of the three timescales,
there are often cases in which the maximum rate will be below
threshold on one or two of the timescales. The value of V/Vmax can be
determined for any burst by selecting the maximum of the three peak
rates, raised to the -3/2 power. Many bursts have unknown counts or
thresholds on one or more timescales. These are marked by a "-999" in
the table. This can happen for one of the following reasons:
1. If the trigger occurs on the 64ms timescale during the peak 256ms
rate, then the peak 256ms rate is not found.
2. If the 64ms peak rate never exceeds the 64ms threshold, and it
occurs before the trigger time, then the peak 64ms rate is not
found.
3. If the 256ms peak rate never exceeds the 256ms threshold, and it
occurs before the trigger time, then the peak 256ms rate is not
found.
Note that items 2 and 3 do not affect V/Vmax, since these peak rates
do not exceed threshold. Item 1 can on rare occasions lead to an
overestimate of V/Vmax.
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Byte-by-byte Description of file: ulysses.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TrigNo [105/5586] The BATSE trigger number
6- 12 F7.3 deg RAIdeg IPN (Interplanetary Network BATSE/Ulysses)
right ascension of the center annulus,
in heliocentric frame (J2000)
14- 20 F7.3 deg DEIdeg IPN (Interplanetary Network BATSE/Ulysses)
declination of the center annulus,
in heliocentric frame (J2000)
22- 27 F6.3 deg RIPN Angular radius of the IPN (BATSE/Ulysses)
annulus, in the heliocentric frame
29- 33 F5.3 deg dRIPN Half-width of the IPN (BATSE/Ulysses) annulus
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History:
* 20-Feb-1998: 4B (1998 version)
* 24-Nov-2000: catalog was copied from
http://gammaray.msfc.nasa.gov/batse/ in November 2000;
Ulysses data from the electronic version of the ApJS.
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(End) Francois Ochsenbein, Patricia Bauer [CDS] 20-Nov-2000