batgrbproduct Analysis for Trigger=591237
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): Tue Mar 11 09:38:38 EDT 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger591237/GCN5_download_cron
======================================================================
Trigger: 00591237 Segment: 000
BAT Trigger Time: 416178312 [s; MET]
Trigger Stop: 416178704 [s; MET]
UTC: 2014-03-10T21:05:00.256460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.264887129568 Dec: -8.70709199265057 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 24.29
Flight Position: [ source = BAT ]
RA: 283.264887129568 Dec: -8.70709199265057 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.27776433122 Dec: -8.70944617237586 [deg; J2000]
{ 18h 53m 06.7s , -08d 42' 34.0" }
+/- 1.49821363283127 [arcmin] (estimated 90% radius based on SNR)
+/- 0.587467131587983 [arcmin] (formal 1-sigma fit error)
SNR: 17.0725638212939
Angular difference between Flight and Ground position is 0.776678 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 603.31199991703 +/- 31.6416748688052
Measured from: -46.9639998674393
to: 556.348000049591 [s; relative to TRIGTIME]
T50: 281.987999916077 +/- 16.0990997548215
Measured from: 108.660000145435
to: 390.648000061512 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 334.364000022411
to: 335.364000022411 [s; relative to TRIGTIME]
Total Fluence
Measured from: -131.060000002384
to: 638.259999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 18.001430 2.028070 0.072932 0.269339
0.182220 0.161813 0.135171 0.122606 [error]
Peak 0.045263 0.009541 0.009495 0.010438
0.006955 0.006077 0.005073 0.004614 [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 6.41e-06 9.07e-07 5.76e-08 3.88e-09 7.38e-06 7.38e-06 erg/cm2
Error 5.09e-07 9.01e-08 1.50e-08 1.75e-09 5.02e-07 5.02e-07 erg/cm2
Peak flux Power-law 4.30e-01 1.32e-01 2.25e-02 4.40e-03 5.88e-01 5.90e-01 ph/cm2/s
Error 1.21e-01 6.61e-02 2.90e-02 1.14e-02 1.59e-01 1.61e-01 ph/cm2/s
Fluence Cutoff-PL 6.13e-06 6.97e-07 1.00e-09 6.64e-16 6.83e-06 6.83e-06 erg/cm2
Error 5.89e-07 1.12e-07 2.68e-09 2.20e-13 5.99e-07 5.99e-07 erg/cm2
Peak flux Cutoff-PL 4.34e-01 1.27e-01 2.03e-02 3.72e-03 5.81e-01 5.83e-01 ph/cm2/s
Error 1.18e-01 9.94e-02 2.87e-02 8.42e-03 1.58e-01 1.59e-01 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 5.976 0.248 - - 7.95e-05 1.67e-05 80.830 57
CPL 1.000 0.000 50.0 0.0 1.08e-03 0.00e+00 678.330 56
The chi2 of BB fit is 60.62 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 3.559 1.019 - - 1.39e-03 1.23e-03 55.230 57
CPL -1.315 0.000 13.5 12.4 1.90e+01 0.00e+00 55.850 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 769.320 -131.060 638.260
T90 603.312 -46.964 556.348
T50 281.988 108.660 390.648
Peak 1.000 334.364 335.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.2778 -8.7094 0.0112 29.2 -168.6 15.1049 17.1 TRIG_00591237
------------------------------------------
Foreground time interval of the image:
-131.060 421.001 (delta_t = 552.061 [sec])
Background time interval of the image:
-188.799 -169.070 (delta_t = 19.729 [sec])
-168.000 -131.060 (delta_t = 36.940 [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
Multiple GTIs in the spectrum
tstart tstop
-131.060000 546.500000
548.000000 638.260000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.97646 ( -0.247644 0.248319 )
Norm@50keV : 7.95454E-05 ( -1.53692e-05 1.81258e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.83 using 59 PHA bins.
# Reduced chi-squared = 1.418 for 57 degrees of freedom
# Null hypothesis probability = 2.066303e-02
Photon flux (15-150 keV) in 767.8 sec: 0.319722 ( -0.0238935 0.0241585 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38149e-06 ( -4.9996e-07 5.04767e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-131.060000 546.500000
548.000000 638.260000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.07628E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 678.33 using 59 PHA bins.
# Reduced chi-squared = 12.113 for 56 degrees of freedom
# Null hypothesis probability = 1.051316e-107
Photon flux (15-150 keV) in 767.8 sec: 0.296096 ( -0.029044 0.028339 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82842e-06 ( -6.06347e-07 5.91283e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-131.060000 546.500000
548.000000 638.260000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.99447 ( 2.35139 8.99447 )
beta : -6.00209 ( -0.231502 0.266394 )
Epeak [keV] : 350.918 ( -350.918 -350.918 )
Norm@50keV : 1.05674E-02 ( -0.00197493 0.00258564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.86 using 59 PHA bins.
# Reduced chi-squared = 1.470 for 55 degrees of freedom
# Null hypothesis probability = 1.317935e-02
Photon flux (15-150 keV) in 767.8 sec: 0.143431 ( 6.85657 -0.143431 ) 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] : 2.78432 (-0.128407 0.13985)
R^2/D10^2 : 68.1686 (-22.3462 32.5622)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.467369e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.063e-06 7.309e-07
25- 50 6.759e-07 8.953e-08
50-150 5.800e-10 2.686e-10
15-150 6.739e-06 7.098e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.89250 (-0.329895 0.373489)
Norm : 76.5015 (-21.3235 29.2269)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.055666e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.278e-06 6.185e-07
25- 50 7.551e-07 9.064e-08
50-150 3.504e-09 1.460e-09
15-150 7.037e-06 6.407e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.77527 (-0.165094 0.184803)
R1^2/D10^2 : 69.8096 ( )
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.91321E-06 (-1.56909e-06 1.2953e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 3.461692e-01
# Null hypothesis probability = 4.152233e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.076e-06 5.908e-07
25- 50 6.748e-07 8.258e-08
50-150 1.186e-07 2.809e-10
15-150 6.869e-06 6.465e-07
Peak spectrum fit
Power-law model
Time interval is from 334.364 sec. to 335.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.55949 ( -0.885172 1.15335 )
Norm@50keV : 1.38547E-03 ( -0.000965712 0.00149359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 57 degrees of freedom
# Null hypothesis probability = 5.418534e-01
Photon flux (15-150 keV) in 1 sec: 0.588186 ( -0.159141 0.159408 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26197e-08 ( -7.6806e-09 9.25192e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 334.364 sec. to 335.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.31469 ( )
Epeak [keV] : 13.5002 ( -10.6878 14.1709 )
Norm@50keV : 19.0180 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 56 degrees of freedom
# Null hypothesis probability = 4.806543e-01
Photon flux (15-150 keV) in 1 sec: 0.581162 ( -0.153911 0.163064 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26245e-08 ( -9.3527e-09 9.0377e-09 ) ergs/cm2
Band function
Time interval is from 334.364 sec. to 335.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.08236 ( 1.68761 1.68761 )
beta : -3.93926 ( 3.73853 1.0432 )
Epeak [keV] : 14.5573 ( -3.33031 102.898 )
Norm@50keV : 7021.64 ( -7027.53 1.07999e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9971 for 55 degrees of freedom
# Null hypothesis probability = 4.807294e-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] : 3.59319 (-0.821367 1.08137)
R^2/D10^2 : 26.8591 (-26.8591 94.4982)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9796 for 57 degrees of freedom
# Null hypothesis probability = 5.188574e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.417e-08 8.350e-09
25- 50 3.726e-09 2.478e-09
50-150 2.285e-11 2.642e-11
15-150 1.792e-08 1.026e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.98680 (-3.46782 8.09279)
Norm : 24.5512 (-24.5509 57.8118)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.97 using 59 PHA bins.
# Reduced chi-squared = 0.9820 for 57 degrees of freedom
# Null hypothesis probability = 5.136440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.354e-08 7.935e-09
25- 50 5.020e-09 3.367e-09
50-150 2.541e-10 2.701e-10
15-150 1.881e-08 1.119e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.47281 (-0.831997 0.958876)
R1^2/D10^2 : 31.6716 (-23.7836 126.015)
kT2 [keV] : 75.0166 (-61.9032 -76.0643)
R2^2/D10^2 : 2.90095E-04 (-0.00026332 0.0250484)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.506712e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.403e-08 8.210e-09
25- 50 4.285e-09 2.455e-09
50-150 1.676e-08 1.194e-08
15-150 3.508e-08 1.719e-08
Plot creation:
Tue Mar 11 10:06:25 EDT 2014