batgrbproduct Analysis for Trigger=426722
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Jul 4 22:40:52 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger426722/GCN5_download_cron
======================================================================
Trigger: 00426722 Segment: 000
BAT Trigger Time: 299907314.688 [s; MET]
Trigger Stop: 299907315.712 [s; MET]
UTC: 2010-07-04T03:35:08.736120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.636084668684 Dec: -24.215664518349 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.73
Image Trigger?: NO
Rate S/N Ratio: 65.1229606206597 [ if not an image trigger ]
Image S/N Ratio: 19.73
Flight Position: [ source = BAT ]
RA: 133.636084668684 Dec: -24.215664518349 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.63893342416 Dec: -24.2022156676627 [deg; J2000]
{ 08h 54m 33.3s , -24d 12' 08.0" }
+/- 0.752256358661465 [arcmin] (estimated 90% radius based on SNR)
+/- 0.242279794445356 [arcmin] (formal 1-sigma fit error)
SNR: 45.6813120750089
Angular difference between Flight and Ground position is 0.821852 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 197.543999969959 +/- 23.2593145938513
Measured from: -15.8959999084473
to: 181.648000061512 [s; relative to TRIGTIME]
T50: 147.875999927521 +/- 2.15740586094229
Measured from: 0.640000104904175
to: 148.516000032425 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.755999982357025
to: 1.75599998235703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -62.3360000252724
to: 202.303999960423 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.161990 3.857631 2.472326 0.576054
0.091506 0.094055 0.082078 0.070175 [error]
Peak 0.093989 0.180089 0.203601 0.053127
0.007439 0.008831 0.009069 0.006418 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.02e-06 1.63e-06 1.98e-06 4.68e-06 5.97e-06 9.31e-06 erg/cm2
Error 6.14e-08 5.59e-08 8.57e-08 4.56e-07 2.01e-07 5.09e-07 erg/cm2
Peak flux Power-law 9.45e-01 1.29e+00 1.30e+00 2.35e+00 4.30e+00 5.90e+00 ph/cm2/s
Error 8.75e-02 7.38e-02 6.83e-02 2.61e-01 2.07e-01 3.17e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-06 1.64e-06 1.98e-06 4.24e-06 5.94e-06 8.79e-06 erg/cm2
Error 7.47e-08 6.20e-08 8.79e-08 1.07e-06 2.16e-07 1.11e-06 erg/cm2
Peak flux Cutoff-PL 8.60e-01 1.33e+00 1.37e+00 1.58e+00 4.26e+00 5.14e+00 ph/cm2/s
Error 1.08e-01 8.27e-02 8.73e-02 5.25e-01 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.725 0.063 - - 2.44e-03 7.90e-05 59.950 57
CPL 1.633 0.188 203.1 0.0 2.71e-03 0.00e+00 59.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.991 0.079 - - 3.73e-02 1.78e-03 67.770 57
CPL 0.586 0.328 197.3 250.7 5.73e-02 1.99e-02 62.880 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 171.648000 sec.
T50 in the 50-300 keV band: 44.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 264.640 -62.336 202.304
T90 197.544 -15.896 181.648
T50 147.876 0.640 148.516
Peak 1.000 0.756 1.756
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.6389 -24.2022 0.0042 29.9 -157.5 5.5716 45.7 TRIG_00426722
------------------------------------------
Foreground time interval of the image:
-62.336 13.613 (delta_t = 75.949 [sec])
Background time interval of the image:
-239.688 -62.336 (delta_t = 177.352 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -62.336 sec. to 202.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72533 ( -0.0623363 0.0626818 )
Norm@50keV : 2.44244E-03 ( -7.91457e-05 7.89165e-05 )
------------------------------------------------------------
# Chi-Squared = 59.95 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.691881e-01
Photon flux (15-150 keV) in 264.6 sec: 0.327306 ( -0.0113737 0.0114168 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97258e-06 ( -2.00393e-07 2.01132e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -62.336 sec. to 202.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63308 ( -0.226893 0.149664 )
Epeak [keV] : 203.119 ( )
Norm@50keV : 2.70560E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.400488e-01
Photon flux (15-150 keV) in 264.6 sec: 0.325590 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94202e-06 ( -2.09828e-07 2.21603e-07 ) ergs/cm2
Band function
Time interval is from -62.336 sec. to 202.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18082 ( 1.18097 1.62728 )
beta : -1.78934 ( 1.78929 0.0971221 )
Epeak [keV] : 55.5420 ( -55.5429 -55.5429 )
Norm@50keV : 5.13171E-03 ( -0.00512877 16.9338 )
------------------------------------------------------------
# Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.588787e-01
Photon flux (15-150 keV) in 264.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7172 ( )
R^2/D10^2 : 4.59413E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 288.49 using 59 PHA bins.
# Reduced chi-squared = 5.0612 for 57 degrees of freedom
# Null hypothesis probability = 1.155638e-32
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.840e-07 2.858e-08
25- 50 1.763e-06 7.409e-08
50-150 2.162e-06 1.428e-07
15-150 4.409e-06 1.641e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.732 (16.7219 61.3719)
Norm : 1.33777 (-0.0581626 0.0631186)
------------------------------------------------------------
# Chi-Squared = 65.57 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 57 degrees of freedom
# Null hypothesis probability = 2.041159e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.155e-07 4.511e-08
25- 50 1.673e-06 6.192e-08
50-150 3.175e-06 2.156e-07
15-150 5.764e-06 2.196e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56848 (-0.646071 0.950117)
R1^2/D10^2 : 0.291757 (-0.0935635 0.106745)
kT2 [keV] : 28.7631 (-3.45063 7.20886)
R2^2/D10^2 : 2.38456E-03 (-0.00124043 0.00139718)
------------------------------------------------------------
# Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.402690e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.487e-07 9.631e-08
25- 50 1.721e-06 1.783e-07
50-150 3.277e-06 1.227e-06
15-150 5.847e-06 1.289e-06
Peak spectrum fit
Power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.991021 ( -0.0793206 0.0786167 )
Norm@50keV : 3.73424E-02 ( -0.00178334 0.00178251 )
------------------------------------------------------------
# Chi-Squared = 67.77 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.556359e-01
Photon flux (15-150 keV) in 1 sec: 4.29864 ( -0.207247 0.207532 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05149e-07 ( -2.14903e-08 2.14404e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.586305 ( -0.340825 0.315608 )
Epeak [keV] : 197.345 ( -65.1283 436.3 )
Norm@50keV : 5.73334E-02 ( -0.0159495 0.0238999 )
------------------------------------------------------------
# Chi-Squared = 62.88 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.457948e-01
Photon flux (15-150 keV) in 1 sec: 4.25563 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98994e-07 ( -2.2539e-08 2.2403e-08 ) ergs/cm2
Band function
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.310157 ( 0.799044 5.79453 )
beta : -1.22828 ( 1.22828 0.21149 )
Epeak [keV] : 120.495 ( -74.2502 200.025 )
Norm@50keV : 8.25239E-02 ( -0.0384259 0.5598 )
------------------------------------------------------------
# Chi-Squared = 61.91 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.432144e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.4235 ( )
R^2/D10^2 : 0.171318 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 124.32 using 59 PHA bins.
# Reduced chi-squared = 2.1810 for 57 degrees of freedom
# Null hypothesis probability = 6.490982e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-08 1.360e-09
25- 50 7.664e-08 5.365e-09
50-150 2.625e-07 2.210e-08
15-150 3.539e-07 2.025e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 16.8927 ( )
------------------------------------------------------------
# Chi-Squared = 192.49 using 59 PHA bins.
# Reduced chi-squared = 3.3770 for 57 degrees of freedom
# Null hypothesis probability = 1.348303e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.206e-08 2.177e-08
25- 50 8.092e-08 4.179e-08
50-150 1.775e-07 9.245e-08
15-150 3.005e-07 1.556e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.2710 (-2.44202 2.89869)
R1^2/D10^2 : 0.938843 (-0.406842 0.950261)
kT2 [keV] : 38.1954 (-8.47466 27.6055)
R2^2/D10^2 : 2.24736E-02 (-0.0175263 0.029573)
------------------------------------------------------------
# Chi-Squared = 64.87 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 55 degrees of freedom
# Null hypothesis probability = 1.704147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.472e-08 4.545e-09
25- 50 8.191e-08 1.372e-08
50-150 2.948e-07 9.730e-08
15-150 4.014e-07 1.214e-07
Plot creation:
Sun Jul 4 23:03:32 EDT 2010