batgrbproduct analysis for trigger=750096
batgrbproduct Analysis for Trigger=750096
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Thu Apr 27 18:59:39 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger750096/GCN5_download_cron
======================================================================
Trigger: 00750096 Segment: 000
BAT Trigger Time: 514939480 [s; MET]
Trigger Stop: 514939544 [s; MET]
UTC: 2017-04-26T22:44:21.029820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 184.879938135627 Dec: 5.65587280404081 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.8
Flight Position: [ source = BAT ]
RA: 184.879938135627 Dec: 5.65587280404081 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.80238150739 Dec: 5.62672484347984 [deg; J2000]
{ 12h 19m 12.6s , +05d 37' 36.2" }
+/- 4.60793300988188 [arcmin] (estimated 90% radius based on SNR)
+/- 3.30738041808554 [arcmin] (formal 1-sigma fit error)
SNR: 3.42967084705155
Angular difference between Flight and Ground position is 4.950095 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 0.179073 0.160076 -0.038771 -0.040393
0.043683 0.045857 0.039535 0.037704 [error]
Peak 0.179073 0.160076 -0.038771 -0.040393
0.043683 0.045857 0.039535 0.037704 [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 4.50e-08 4.15e-08 2.63e-08 2.68e-08 1.24e-07 1.45e-07 erg/cm2
Error 1.69e-08 1.90e-08 2.64e-08 4.41e-08 5.94e-08 8.38e-08 erg/cm2
Peak flux Power-law 2.30e-02 1.21e-02 3.97e-03 1.65e-03 4.00e-02 4.06e-02 ph/cm2/s
Error 8.80e-03 5.30e-03 3.73e-03 2.47e-03 1.49e-02 1.55e-02 ph/cm2/s
Fluence Cutoff-PL 4.39e-08 7.05e-08 8.35e-09 1.05e-11 1.23e-07 1.23e-07 erg/cm2
Error 2.02e-08 3.09e-08 1.65e-08 1.40e-09 4.41e-08 4.41e-08 erg/cm2
Peak flux Cutoff-PL 2.15e-02 2.07e-02 1.42e-03 1.02e-06 4.36e-02 4.37e-02 ph/cm2/s
Error 1.04e-02 8.56e-03 2.57e-03 1.16e-04 1.40e-02 1.40e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.15e-02 2.07e-02 1.65e-03 6.74e-06 4.38e-02 4.38e-02 ph/cm2/s
Error 1.00e-02 8.34e-03 -------- 5.76e-04 1.38e-02 1.38e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.631 0.710 - - 1.87e-04 1.17e-04 68.680 57
CPL -2.708 0.428 28.7 7.5 7.12e-01 9.73e+04 61.790 56
The chi2 of BB fit is 62.07 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 2.631 0.710 - - 1.87e-04 1.17e-04 68.680 57
CPL -2.708 0.428 28.7 7.5 7.12e-01 7.37e+04 61.790 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
184.8024 +5.6267 0.0561 8.7 25.5 0.3612 3.4 TRIG_00750096
------------------------------------------
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) 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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63082 ( -0.591009 0.828327 )
Norm@50keV : 1.87122E-04 ( -0.000108423 0.000126027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.68 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.381159e-01
Photon flux (15-150 keV) in 64 sec: 4.00158E-02 ( -0.0147677 0.0150436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23968e-07 ( -5.5841e-08 6.29852e-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: -2.70804 ( 2.76014 3.61583 )
Epeak [keV] : 28.7339 ( -7.76837 7.31731 )
Norm@50keV : 0.711905 ( -0.894815 194605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.771061e-01
Photon flux (15-150 keV) in 64 sec: 4.36429E-02 ( -0.0138541 0.0140648 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22805e-07 ( -4.23526e-08 4.57747e-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 : 4.68234 ( -4.65511 -4.68234 )
beta : -9.37167 ( 9.37167 19.3281 )
Epeak [keV] : 29.2719 ( -6.33984 6.28913 )
Norm@50keV : 14.8595 ( -4.65672 148.018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.89 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.437559e-01
Photon flux (15-150 keV) in 64 sec: 4.38021E-02 ( 6.9562 -0.01367 ) 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] : 7.23470 (-1.77864 2.12313)
R^2/D10^2 : 8.24971E-02 (-0.082462 0.171346)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.07 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 3.004630e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.588e-08 2.792e-08
25- 50 6.692e-08 4.259e-08
50-150 1.248e-08 1.122e-08
15-150 1.253e-07 7.926e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.1348 (-11.9022 24.7335)
Norm : 0.397689 (-0.183415 0.360577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.094514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.794e-08 2.892e-08
25- 50 5.053e-08 3.248e-08
50-150 2.291e-08 2.192e-08
15-150 1.214e-07 8.246e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.20387 (-7.21679 -7.21679)
R1^2/D10^2 : 3.87161E-02 (-0.0388449 -0.0388449)
kT2 [keV] : 7.27693 (-7.24299 -7.24299)
R2^2/D10^2 : 4.34165E-02 (-0.0435645 -0.0435645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.07 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.389248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.583e-08 3.885e-01
25- 50 6.700e-08 2.943e+00
50-150 1.254e-08 6.816e+01
15-150 1.254e-07 7.331e+01
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: 2.63082 ( -0.591009 0.828327 )
Norm@50keV : 1.87122E-04 ( -0.000108423 0.000126027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.68 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.381159e-01
Photon flux (15-150 keV) in 64 sec: 4.00158E-02 ( -0.0147677 0.0150436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23968e-07 ( -5.5841e-08 6.29852e-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: -2.70804 ( 2.76014 3.61583 )
Epeak [keV] : 28.7339 ( -7.76837 7.31731 )
Norm@50keV : 0.711905 ( -0.894815 147300 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.771061e-01
Photon flux (15-150 keV) in 64 sec: 4.36429E-02 ( -0.0138541 0.0140648 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22805e-07 ( -4.23526e-08 4.57747e-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 : 4.68234 ( -4.65511 -4.68234 )
beta : -9.37167 ( 9.37167 19.3281 )
Epeak [keV] : 29.2719 ( -6.33984 6.28913 )
Norm@50keV : 14.8595 ( -4.65672 148.018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.89 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.437559e-01
Photon flux (15-150 keV) in 64 sec: 4.38021E-02 ( 6.9562 -0.01367 ) 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] : 7.23470 (-1.77864 2.12313)
R^2/D10^2 : 8.24971E-02 (-0.082462 0.171346)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.07 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 3.004630e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.588e-08 2.704e-08
25- 50 6.692e-08 4.035e-08
50-150 1.248e-08 1.074e-08
15-150 1.253e-07 7.584e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.1348 (-11.9022 24.7335)
Norm : 0.397689 (-0.183415 0.360577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.094514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.794e-08 2.908e-08
25- 50 5.053e-08 3.116e-08
50-150 2.291e-08 2.256e-08
15-150 1.214e-07 7.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.20387 (-7.21679 -7.21679)
R1^2/D10^2 : 3.87161E-02 (-0.0388449 -0.0388449)
kT2 [keV] : 7.27693 (-7.24299 -7.24299)
R2^2/D10^2 : 4.34165E-02 (-0.0435645 -0.0435645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.07 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.389248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.583e-08 3.172e-01
25- 50 6.700e-08 3.188e+00
50-150 1.254e-08 7.501e+01
15-150 1.254e-07 7.658e+01
Plot creation:
Thu Apr 27 19:22:26 EDT 2017