batgrbproduct analysis for trigger=773898
batgrbproduct Analysis for Trigger=773898
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): Mon Sep 25 04:33:19 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger773898/GCN5_download_cron
======================================================================
Trigger: 00773898 Segment: 000
BAT Trigger Time: 527942560 [s; MET]
Trigger Stop: 527942648 [s; MET]
UTC: 2017-09-24T10:42:20.264340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.073464197006 Dec: -41.9341897045602 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.93
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.93
Flight Position: [ source = BAT ]
RA: 255.073464197006 Dec: -41.9341897045602 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.074170193597 Dec: -41.9236043949075 [deg; J2000]
{ 17h 00m 17.8s , -41d 55' 25.0" }
+/- 3.09444815543089 [arcmin] (estimated 90% radius based on SNR)
+/- 1.51005582258895 [arcmin] (formal 1-sigma fit error)
SNR: 6.05738561088675
Angular difference between Flight and Ground position is 0.635900 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
T50: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 88 second)
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.383282 0.407782 0.064831 0.045436
0.072345 0.065643 0.055559 0.052121 [error]
Peak 0.383282 0.407782 0.064831 0.045436
0.072345 0.065643 0.055559 0.052121 [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 1.06e-07 1.32e-07 1.19e-07 1.87e-07 4.22e-07 5.45e-07 erg/cm2
Error 2.79e-08 2.88e-08 4.46e-08 1.34e-07 1.08e-07 1.93e-07 erg/cm2
Peak flux Power-law 3.96e-02 2.72e-02 1.23e-02 7.70e-03 8.28e-02 8.68e-02 ph/cm2/s
Error 1.06e-02 5.83e-03 4.45e-03 5.13e-03 1.73e-02 1.84e-02 ph/cm2/s
Fluence Cutoff-PL 9.61e-08 1.88e-07 3.15e-08 8.49e-11 3.16e-07 3.16e-07 erg/cm2
Error 3.29e-08 4.35e-08 4.24e-08 2.78e-09 7.25e-08 7.25e-08 erg/cm2
Peak flux Cutoff-PL 3.41e-02 3.95e-02 3.84e-03 5.63e-06 7.74e-02 7.74e-02 ph/cm2/s
Error 1.23e-02 8.86e-03 4.78e-03 1.72e-04 1.63e-02 1.63e-02 ph/cm2/s
Fluence Band 9.54e-08 1.86e-07 3.99e-08 3.90e-09 3.26e-07 3.27e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.149 0.372 - - 5.14e-04 1.44e-04 58.750 57
CPL -2.774 4.017 31.3 4.7 9.66e-01 1.99e+03 47.910 56
The chi2 of BB fit is 48.59 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 2.149 0.372 - - 5.14e-04 1.44e-04 58.750 57
CPL -2.774 4.017 31.3 4.7 9.66e-01 1.99e+03 47.910 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 88.000 0.000 88.000
T90 88.000 0.000 88.000
T50 88.000 0.000 88.000
Peak 88.000 0.000 88.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.0742 -41.9236 0.0316 8.0 25.1 0.8873 6.1 TRIG_00773898
------------------------------------------
Foreground time interval of the image:
0.000 88.000 (delta_t = 88.000 [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 88.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14894 ( -0.355262 0.38828 )
Norm@50keV : 5.13552E-04 ( -0.000144429 0.000144351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.75 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.109733e-01
Photon flux (15-150 keV) in 88 sec: 8.28033E-02 ( -0.0173345 0.0173354 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22236e-07 ( -1.04366e-07 1.108e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.77436 ( -5.34559 2.68839 )
Epeak [keV] : 31.2715 ( -4.36339 5.10528 )
Norm@50keV : 0.965832 ( -1.12886 3975.44 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8555 for 56 degrees of freedom
# Null hypothesis probability = 7.706016e-01
Photon flux (15-150 keV) in 88 sec: 7.74290E-02 ( -0.0162537 0.016436 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15803e-07 ( -6.85106e-08 7.65046e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.54455 ( -4.055 -4.22234 )
beta : -5.23134 ( 4.50039 1.88601 )
Epeak [keV] : 30.9960 ( -6.13612 4.91475 )
Norm@50keV : 3.25466 ( -3.24952 12.6811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8675 for 55 degrees of freedom
# Null hypothesis probability = 7.465779e-01
Photon flux (15-150 keV) in 88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26412e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.01756 (-1.25533 1.52541)
R^2/D10^2 : 9.99572E-02 (-0.0512829 0.0996021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.59 using 59 PHA bins.
# Reduced chi-squared = 0.8524 for 57 degrees of freedom
# Null hypothesis probability = 7.785273e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-07 3.841e-08
25- 50 1.799e-07 6.441e-08
50-150 4.759e-08 2.801e-08
15-150 3.299e-07 1.147e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.8307 (-14.7161 31.6785)
Norm : 0.544666 (-0.168147 0.246405)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9592 for 57 degrees of freedom
# Null hypothesis probability = 5.627453e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-07 3.070e-08
25- 50 1.471e-07 5.360e-08
50-150 1.164e-07 7.894e-08
15-150 3.743e-07 1.182e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 2.57984E-06 (-2.57989e-06 -2.57989e-06)
kT2 [keV] : 7.82977 (-1.27022 1.56761)
R2^2/D10^2 : 0.107823 (-0.0563456 0.111829)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 48.13 using 59 PHA bins.
# Reduced chi-squared = 0.8834 for 55 degrees of freedom
# Reduced chi-squared = 0.8752 for 55 degrees of freedom
# Null hypothesis probability = 7.166085e-01
# Null hypothesis probability = 7.323082e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-07 1.181e+00
25- 50 1.800e-07 1.012e+01
50-150 4.766e-08 2.658e+02
15-150 3.301e-07 2.707e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14894 ( -0.355262 0.38828 )
Norm@50keV : 5.13552E-04 ( -0.000144429 0.000144351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.75 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.109733e-01
Photon flux (15-150 keV) in 88 sec: 8.28033E-02 ( -0.0173345 0.0173354 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22236e-07 ( -1.04366e-07 1.108e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.77436 ( -5.34559 2.68839 )
Epeak [keV] : 31.2715 ( -4.36339 5.10528 )
Norm@50keV : 0.965832 ( -1.12886 3975.44 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8555 for 56 degrees of freedom
# Null hypothesis probability = 7.706016e-01
Photon flux (15-150 keV) in 88 sec: 7.74290E-02 ( -0.0162537 0.016436 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15803e-07 ( -6.85106e-08 7.65046e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.54455 ( -4.055 -4.22234 )
beta : -5.23134 ( 4.50039 1.88601 )
Epeak [keV] : 30.9960 ( -6.13612 4.91475 )
Norm@50keV : 3.25466 ( -3.24952 12.6854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8675 for 55 degrees of freedom
# Null hypothesis probability = 7.465779e-01
Photon flux (15-150 keV) in 88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26412e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.01756 (-1.25533 1.52541)
R^2/D10^2 : 9.99572E-02 (-0.0512829 0.0996021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.59 using 59 PHA bins.
# Reduced chi-squared = 0.8524 for 57 degrees of freedom
# Null hypothesis probability = 7.785273e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-07 3.777e-08
25- 50 1.799e-07 6.050e-08
50-150 4.759e-08 2.774e-08
15-150 3.299e-07 1.198e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.8307 (-14.7161 31.6785)
Norm : 0.544666 (-0.168147 0.246405)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9592 for 57 degrees of freedom
# Null hypothesis probability = 5.627453e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-07 3.074e-08
25- 50 1.471e-07 5.394e-08
50-150 1.164e-07 7.573e-08
15-150 3.743e-07 1.435e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 2.57984E-06 (-2.57989e-06 -2.57989e-06)
kT2 [keV] : 7.82977 (-1.27022 1.56761)
R2^2/D10^2 : 0.107823 (-0.0563456 0.111829)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 48.13 using 59 PHA bins.
# Reduced chi-squared = 0.8834 for 55 degrees of freedom
# Reduced chi-squared = 0.8752 for 55 degrees of freedom
# Null hypothesis probability = 7.166085e-01
# Null hypothesis probability = 7.323082e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-07 1.286e+00
25- 50 1.800e-07 1.039e+01
50-150 4.766e-08 2.552e+02
15-150 3.301e-07 2.495e+02
Plot creation:
Mon Sep 25 04:48:44 EDT 2017