batgrbproduct Analysis for Trigger=421072
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Wed May 5 01:52:13 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421072/GCN5_download_cron
======================================================================
Trigger: 00421072 Segment: 000
BAT Trigger Time: 294650920 [s; MET]
Trigger Stop: 294650984 [s; MET]
UTC: 2010-05-04T07:28:34.234040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 98.2463673293655 Dec: 9.16544017558485 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.4
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.4
Flight Position: [ source = BAT ]
RA: 98.2463673293655 Dec: 9.16544017558485 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.2337818257669 Dec: 9.21066533321714 [deg; J2000]
{ 06h 32m 56.1s , +09d 12' 38.4" }
+/- 3.80879166987331 [arcmin] (estimated 90% radius based on SNR)
+/- 2.17324470513808 [arcmin] (formal 1-sigma fit error)
SNR: 4.50217480621853
Angular difference between Flight and Ground position is 2.814039 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.244670 0.139848 -0.015560 -0.013073
0.041391 0.042634 0.037601 0.033957 [error]
Peak 0.244670 0.139848 -0.015560 -0.013073
0.041391 0.042634 0.037601 0.033957 [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 5.78e-08 5.20e-08 3.22e-08 3.04e-08 1.55e-07 1.72e-07 erg/cm2
Error 1.69e-08 1.99e-08 2.43e-08 4.79e-08 6.15e-08 8.79e-08 erg/cm2
Peak flux Power-law 3.03e-02 1.53e-02 4.74e-03 1.88e-03 5.13e-02 5.22e-02 ph/cm2/s
Error 8.49e-03 5.47e-03 4.32e-03 2.68e-03 1.42e-02 1.48e-02 ph/cm2/s
Fluence Cutoff-PL 6.52e-08 5.40e-08 2.75e-09 1.04e-12 1.22e-07 1.22e-07 erg/cm2
Error 1.83e-08 2.31e-08 1.02e-08 2.38e-13 3.61e-08 3.61e-08 erg/cm2
Peak flux Cutoff-PL 3.37e-02 1.66e-02 4.49e-04 8.06e-08 5.07e-02 5.07e-02 ph/cm2/s
Error 8.99e-03 5.47e-03 1.53e-03 5.54e-05 1.27e-02 1.27e-02 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 2.691 0.670 - - 2.28e-04 1.83e-04 49.700 57
CPL -4.910 0.000 22.8 3.9 1.34e+02 8.66e+01 44.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.687 0.643 - - 2.32e-04 1.84e-04 50.790 57
CPL -4.907 0.000 22.6 3.7 1.43e+02 9.17e+01 45.710 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.2338 +9.2107 0.0430 2.3 146.0 0.3546 4.5 TRIG_00421072
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69065 ( -0.586549 0.752511 )
Norm@50keV : 2.28129E-04 ( -0.000228129 0.000137098 )
------------------------------------------------------------
# Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.8720 for 57 degrees of freedom
# Null hypothesis probability = 7.427164e-01
Photon flux (15-150 keV) in 64 sec: 5.06006E-02 ( -0.0143935 0.0145665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54818e-07 ( -5.63731e-08 6.65402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.91030 ( )
Epeak [keV] : 22.7877 ( -3.59239 4.13489 )
Norm@50keV : 133.814 ( -133.814 39.3767 )
------------------------------------------------------------
# Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8033 for 56 degrees of freedom
# Null hypothesis probability = 8.540754e-01
Photon flux (15-150 keV) in 64 sec: 4.98444E-02 ( -0.0129426 0.0130298 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22034e-07 ( -3.50157e-08 3.72166e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38542 ( 1.31834 1.31834 )
beta : -9.37167 ( 4.59225 14.1326 )
Epeak [keV] : 22.8144 ( -12.0863 96.9146 )
Norm@50keV : 51.1677 ( -51.1778 18.6924 )
------------------------------------------------------------
# Chi-Squared = 45.07 using 59 PHA bins.
# Reduced chi-squared = 0.8195 for 55 degrees of freedom
# Null hypothesis probability = 8.278900e-01
Photon flux (15-150 keV) in 64 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] : 5.56417 (-1.18838 1.48913)
R^2/D10^2 : 0.276200 (-0.276212 0.519318)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 45.83 using 59 PHA bins.
# Reduced chi-squared = 0.8040 for 57 degrees of freedom
# Null hypothesis probability = 8.554060e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.472e-08 3.773e-08
25- 50 5.452e-08 3.475e-08
50-150 3.627e-09 3.306e-09
15-150 1.229e-07 7.482e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.8630 (-8.37781 18.4886)
Norm : 0.622518 (-0.296022 0.607045)
------------------------------------------------------------
# Chi-Squared = 48.08 using 59 PHA bins.
# Reduced chi-squared = 0.8435 for 57 degrees of freedom
# Null hypothesis probability = 7.939041e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.143e-08 3.043e-08
25- 50 5.351e-08 3.193e-08
50-150 1.584e-08 1.435e-08
15-150 1.308e-07 7.811e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.42427 (-1.18835 1.48916)
R1^2/D10^2 : 0.302567 (-0.276218 0.519289)
kT2 [keV] : 199.363 ( )
R2^2/D10^2 : 3.46211E-06 (-3.4967e-06 -3.4967e-06)
------------------------------------------------------------
# Chi-Squared = 45.83 using 59 PHA bins.
# Chi-Squared = 44.62 using 59 PHA bins.
# Reduced chi-squared = 0.8333 for 55 degrees of freedom
# Reduced chi-squared = 0.8113 for 55 degrees of freedom
# Null hypothesis probability = 8.061056e-01
# Null hypothesis probability = 8.400960e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68683 ( -0.563105 0.72238 )
Norm@50keV : 2.32086E-04 ( -0.000232086 0.000136195 )
------------------------------------------------------------
# Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.8910 for 57 degrees of freedom
# Null hypothesis probability = 7.059375e-01
Photon flux (15-150 keV) in 64 sec: 5.13486E-02 ( -0.0140926 0.0142931 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57293e-07 ( -5.59674e-08 6.61344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.90682 ( )
Epeak [keV] : 22.6077 ( -3.4528 3.92293 )
Norm@50keV : 143.213 ( -143.213 40.2606 )
------------------------------------------------------------
# Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8163 for 56 degrees of freedom
# Null hypothesis probability = 8.351505e-01
Photon flux (15-150 keV) in 64 sec: 5.06995E-02 ( -0.0126467 0.0127421 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23668e-07 ( -3.44576e-08 3.64992e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.25392 ( 1.43045 1.43045 )
beta : -9.37167 ( 3.88676 13.0365 )
Epeak [keV] : 22.8262 ( -11.6899 11.1263 )
Norm@50keV : 40.9922 ( -37.9314 33.5267 )
------------------------------------------------------------
# Chi-Squared = 45.84 using 59 PHA bins.
# Reduced chi-squared = 0.8335 for 55 degrees of freedom
# Null hypothesis probability = 8.057832e-01
Photon flux (15-150 keV) in 64 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] : 5.52930 (-1.14778 1.41608)
R^2/D10^2 : 0.288632 (-0.288632 0.509325)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.61 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 57 degrees of freedom
# Null hypothesis probability = 8.353519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.609e-08 3.704e-08
25- 50 5.488e-08 3.491e-08
50-150 3.551e-09 3.296e-09
15-150 1.245e-07 7.389e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.8384 (-8.19513 17.3549)
Norm : 0.632396 (-0.289609 0.580227)
------------------------------------------------------------
# Chi-Squared = 49.03 using 59 PHA bins.
# Reduced chi-squared = 0.8601 for 57 degrees of freedom
# Null hypothesis probability = 7.647318e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.234e-08 3.191e-08
25- 50 5.425e-08 3.288e-08
50-150 1.603e-08 1.452e-08
15-150 1.326e-07 7.306e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.38846 (-1.11635 1.37869)
R1^2/D10^2 : 0.315424 (-0.234229 0.56338)
kT2 [keV] : 198.199 (-199.956 -199.956)
R2^2/D10^2 : 3.67390E-06 (-3.61876e-06 0.606656)
------------------------------------------------------------
# Chi-Squared = 45.39 using 59 PHA bins.
# Reduced chi-squared = 0.8253 for 55 degrees of freedom
# Null hypothesis probability = 8.188170e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.592e-08 3.728e-08
25- 50 5.385e-08 3.200e-08
50-150 6.474e-08 3.121e-09
15-150 1.845e-07 7.453e-08
Plot creation:
Wed May 5 02:17:31 EDT 2010