batgrbproduct Analysis for Trigger=570402
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Thu Sep 12 17:41:31 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger570402/GCN5_download_cron
======================================================================
Trigger: 00570402 Segment: 000
BAT Trigger Time: 400608000 [s; MET]
Trigger Stop: 400608064 [s; MET]
UTC: 2013-09-11T15:59:48.980000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.6018644145 Dec: -26.3501770526858 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.78
Flight Position: [ source = BAT ]
RA: 268.6018644145 Dec: -26.3501770526858 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.610394301243 Dec: -26.3347961928046 [deg; J2000]
{ 17h 54m 26.5s , -26d 20' 05.3" }
+/- 1.60890965270732 [arcmin] (estimated 90% radius based on SNR)
+/- 0.496514815229577 [arcmin] (formal 1-sigma fit error)
SNR: 15.4196016869606
Angular difference between Flight and Ground position is 1.030540 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 549.491999924183 +/- 33.8532467936228
Measured from: -61.0239998698235
to: 488.468000054359 [s; relative to TRIGTIME]
T50: 279.587999939919 +/- 37.0105690703654
Measured from: 32.0000001192093
to: 311.588000059128 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -68.3799999952316
to: -67.3799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: -78.6320000290871
to: 528.124000012875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.114389 2.330106 0.115156 0.141224
0.146097 0.133811 0.112655 0.099878 [error]
Peak 0.027433 0.015357 0.011930 0.005096
0.008595 0.007902 0.006555 0.005918 [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 1.93e-06 9.18e-07 2.66e-07 9.69e-08 3.17e-06 3.21e-06 erg/cm2
Error 1.42e-07 7.54e-08 4.97e-08 3.20e-08 1.92e-07 1.98e-07 erg/cm2
Peak flux Power-law 1.93e-01 1.49e-01 7.74e-02 5.79e-02 4.46e-01 4.77e-01 ph/cm2/s
Error 1.59e-01 6.07e-02 6.75e-02 1.00e-01 1.79e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.83e-06 8.79e-07 1.85e-08 1.47e-12 2.72e-06 2.72e-06 erg/cm2
Error 1.61e-07 9.59e-08 1.86e-08 2.26e-11 1.94e-07 1.94e-07 erg/cm2
Peak flux Cutoff-PL 1.94e-01 1.49e-01 7.69e-02 4.51e-08 4.46e-01 4.76e-01 ph/cm2/s
Error 1.19e-01 6.16e-02 4.10e-06 1.79e-01 1.93e-01 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 3.788 0.174 - - 2.75e-04 3.91e-05 96.700 57
CPL 1.000 0.000 50.0 0.0 1.49e-03 0.00e+00 465.220 56
The chi2 of BB fit is 54.28 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.947 1.006 - - 3.05e-03 2.30e-03 72.560 57
CPL 2.796 0.000 251.4 0.0 1.18e-03 0.00e+00 71.870 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 606.756 -78.632 528.124
T90 549.492 -61.024 488.468
T50 279.588 32.000 311.588
Peak 1.000 -68.380 -67.380
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.6104 -26.3348 0.0124 6.2 -100.7 1.6269 15.4 TRIG_00570402
------------------------------------------
Foreground time interval of the image:
-17.799 73.201 (delta_t = 91.000 [sec])
Background time interval of the image:
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 -78.632 sec. to 528.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.78783 ( -0.171518 0.176933 )
Norm@50keV : 2.75250E-04 ( -3.78909e-05 4.0221e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.70 using 59 PHA bins.
# Reduced chi-squared = 1.697 for 57 degrees of freedom
# Null hypothesis probability = 8.067640e-04
Photon flux (15-150 keV) in 606.8 sec: 0.141391 ( -0.00885182 0.00888119 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.16759e-06 ( -1.91785e-07 1.92208e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -78.632 sec. to 528.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.49457E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 465.22 using 59 PHA bins.
# Reduced chi-squared = 8.3075 for 56 degrees of freedom
# Null hypothesis probability = 7.831508e-66
Photon flux (15-150 keV) in 606.8 sec: 0.128599 ( -0.009855 0.009792 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72299e-06 ( -1.93205e-07 1.94012e-07 ) ergs/cm2
Band function
Time interval is from -78.632 sec. to 528.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34407 ( )
beta : -8.91643 ( )
Epeak [keV] : 47.7158 ( )
Norm@50keV : 1.08452E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 439.12 using 59 PHA bins.
# Reduced chi-squared = 7.9840 for 55 degrees of freedom
# Null hypothesis probability = 2.712769e-61
Photon flux (15-150 keV) in 606.8 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] : 4.44470 (-0.226979 0.242683)
R^2/D10^2 : 2.03426 (-0.524289 0.70801)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.28 using 59 PHA bins.
# Reduced chi-squared = 0.9523 for 57 degrees of freedom
# Null hypothesis probability = 5.776413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.829e-06 1.690e-07
25- 50 8.833e-07 9.466e-08
50-150 1.964e-08 6.578e-09
15-150 2.732e-06 1.893e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8956 (-0.971901 1.11166)
Norm : 4.06604 (-0.765847 0.954377)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.70 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.256520e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.917e-06 1.614e-07
25- 50 9.223e-07 9.284e-08
50-150 7.929e-08 2.576e-08
15-150 2.918e-06 1.930e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.41149 (-0.249896 0.219584)
R1^2/D10^2 : 2.11021 (-0.444039 0.784448)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.84699E-06 (-1.6759e-06 1.43808e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9289 for 55 degrees of freedom
# Reduced chi-squared = 0.9283 for 55 degrees of freedom
# Null hypothesis probability = 6.247698e-01
# Null hypothesis probability = 6.260217e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.825e-06 1.705e-07
25- 50 8.872e-07 8.799e-08
50-150 3.029e-07 3.285e-08
15-150 3.015e-06 2.279e-07
Peak spectrum fit
Power-law model
Time interval is from -68.380 sec. to -67.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94739 ( -0.899158 1.11353 )
Norm@50keV : 3.04528E-03 ( -0.00304486 0.00154959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.56 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 57 degrees of freedom
# Null hypothesis probability = 8.021624e-02
Photon flux (15-150 keV) in 1 sec: 0.446094 ( -0.179299 0.179326 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80181e-08 ( -1.38589e-08 1.52678e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -68.380 sec. to -67.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79582 ( )
Epeak [keV] : 251.407 ( )
Norm@50keV : 1.17616E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.87 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 56 degrees of freedom
# Null hypothesis probability = 7.503440e-02
Photon flux (15-150 keV) in 1 sec: 0.445963 ( -0.179002 0.179194 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36808e-09 ( -6.4638e-10 6.7443e-10 ) ergs/cm2
Band function
Time interval is from -68.380 sec. to -67.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52187 ( 1.52307 1.52307 )
beta : -1.94728 ( 1.9476 0.898011 )
Epeak [keV] : 13.4508 ( -13.1832 -13.1832 )
Norm@50keV : 8.56122E-03 ( -0.00859756 10161.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.56 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 55 degrees of freedom
# Null hypothesis probability = 5.644383e-02
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] : 8.78999 (-4.83257 11.4278)
R^2/D10^2 : 0.313752 (-0.302263 8.06758)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.96 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.738163e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.660e-09 3.127e-09
25- 50 9.542e-09 6.435e-09
50-150 3.385e-09 2.560e-09
15-150 1.759e-08 1.196e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.0068 (-83.866 -83.866)
Norm : 2.01832 (-0.969162 3.73329)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.28 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.206259e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.249e-09 3.493e-09
25- 50 8.716e-09 5.980e-09
50-150 1.261e-08 1.087e-08
15-150 2.657e-08 1.920e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.04480 (-4.49575 5.19161)
R1^2/D10^2 : 1.27207 ( )
kT2 [keV] : 199.023 (-199.053 -199.053)
R2^2/D10^2 : 7.73342E-05 (-5.76614e-05 0.226184)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.88 using 59 PHA bins.
#Fit statistic : Chi-Squared = 71.86 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 55 degrees of freedom
# Reduced chi-squared = 1.307 for 55 degrees of freedom
# Null hypothesis probability = 6.287084e-02
# Null hypothesis probability = 6.299827e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.545e-09 4.434e-09
25- 50 6.836e-09 4.279e-09
50-150 2.103e-08 2.389e-09
15-150 3.442e-08 1.185e-08
Plot creation:
Thu Sep 12 18:17:49 EDT 2013