batgrbproduct Analysis for Trigger=654954
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): Wed Sep 9 18:25:36 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger654954/GCN5_download_cron
======================================================================
Trigger: 00654954 Segment: 000
BAT Trigger Time: 463441104 [s; MET]
Trigger Stop: 463441440 [s; MET]
UTC: 2015-09-08T21:38:08.892380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.803733671192 Dec: 10.9418370482497 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.59
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.59
Flight Position: [ source = BAT ]
RA: 288.803733671192 Dec: 10.9418370482497 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.83192839809 Dec: 10.9358115578597 [deg; J2000]
{ 19h 15m 19.7s , +10d 56' 08.9" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.58027205704959 [arcmin] (formal 1-sigma fit error)
SNR: -6.15631092930898
Angular difference between Flight and Ground position is 1.699837 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 629.619999945164 +/- 413.330841346899
Measured from: 214.992000102997
to: 844.612000048161 [s; relative to TRIGTIME]
T50: 328.883999943733 +/- 298.98981681266
Measured from: 424.964000105858
to: 753.848000049591 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 485.364000022411
to: 486.364000022411 [s; relative to TRIGTIME]
Total Fluence
Measured from: 173.315999984741
to: 874.216000020504 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.046025 0.654837 0.090358 0.060992
0.180991 0.179381 0.160619 0.164552 [error]
Peak 0.025236 0.022457 0.019715 0.017099
0.014907 0.014684 0.013735 0.013822 [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 5.71e-07 2.71e-07 7.85e-08 2.86e-08 9.37e-07 9.49e-07 erg/cm2
Error 9.61e-08 9.94e-08 6.45e-08 4.79e-08 2.12e-07 2.30e-07 erg/cm2
Peak flux Power-law 1.24e-01 1.47e-01 1.26e-01 1.82e-01 4.62e-01 5.79e-01 ph/cm2/s
Error 1.52e-01 1.30e-01 1.02e-01 1.01e+00 3.24e-01 5.07e-01 ph/cm2/s
Fluence Cutoff-PL 5.72e-07 2.66e-07 7.43e-08 2.63e-08 9.32e-07 9.38e-07 erg/cm2
Error 9.63e-08 -------- -------- -------- 2.20e-07 2.40e-07 erg/cm2
Peak flux Cutoff-PL 1.26e-01 1.48e-01 1.25e-01 1.77e-01 4.63e-01 5.76e-01 ph/cm2/s
Error 1.52e-01 1.60e-01 1.16e-01 5.06e-01 3.24e-01 -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 3.790 0.678 - - 7.11e-05 4.44e-05 59.220 57
CPL 1.900 0.000 1.2 0.0 2.17e-03 0.00e+00 60.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.229 1.749 - - 3.92e-03 3.31e-03 58.370 57
CPL 1.225 4.384 9993.0 0.0 3.94e-03 0.00e+00 58.370 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 700.900 173.316 874.216
T90 629.620 214.992 844.612
T50 328.884 424.964 753.848
Peak 1.000 485.364 486.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
288.8319 +10.9358 0.0313 10.4 -0.2 -1.6602 -6.2 TRIG_00654954
------------------------------------------
Foreground time interval of the image:
173.316 284.270 (delta_t = 110.954 [sec])
285.000 395.501 (delta_t = 110.501 [sec])
Background time interval of the image:
-12.099 173.316 (delta_t = 185.415 [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
173.316000 284.270000
285.000000 445.210000
451.000000 874.216000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.78960 ( -0.604285 0.751609 )
Norm@50keV : 7.10844E-05 ( -3.76228e-05 5.10806e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.22 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.944717e-01
Photon flux (15-150 keV) in 694.4 sec: 3.65696E-02 ( -0.00615021 0.00617635 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3728e-07 ( -2.00012e-07 2.24479e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
173.316000 284.270000
285.000000 445.210000
451.000000 874.216000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89963 ( )
Epeak [keV] : 1.22869 ( )
Norm@50keV : 2.16931E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.59 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.137353e-01
Photon flux (15-150 keV) in 694.4 sec: 3.64741E-02 ( -0.0060882 0.0062519 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.316e-07 ( -2.09424e-07 2.30402e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
173.316000 284.270000
285.000000 445.210000
451.000000 874.216000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.16794 ( 2.16794 2.16794 )
beta : -3.78949 ( -0.751342 0.603861 )
Epeak [keV] : 0.810780 ( -0.81078 -0.81078 )
Norm@50keV : 9.34561E-02 ( -0.0934561 0.668315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.22 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.242527e-01
Photon flux (15-150 keV) in 694.4 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] : 3.68381 (-0.674178 0.827946)
R^2/D10^2 : 1.42910 (-0.939667 3.16191)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.32 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.633575e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.969e-07 2.719e-07
25- 50 1.693e-07 1.034e-07
50-150 1.225e-09 1.180e-09
15-150 7.675e-07 3.617e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.47924 (-2.92859 4.87606)
Norm : 1.37700 (-0.698806 1.89295)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.341725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.838e-07 1.955e-07
25- 50 2.336e-07 1.109e-07
50-150 1.381e-08 1.216e-08
15-150 8.313e-07 3.157e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.07013 (-2.86225 0.938207)
R1^2/D10^2 : 3.54800 (-2.69845 -3.54957)
kT2 [keV] : 11.9323 (-11.9292 30.0712)
R2^2/D10^2 : 2.59623E-03 (-0.00255455 0.03588)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.289329e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.852e-07 3.182e-07
25- 50 2.535e-07 1.405e-07
50-150 1.448e-07 1.110e-07
15-150 9.835e-07 4.878e-07
Peak spectrum fit
Power-law model
Time interval is from 485.364 sec. to 486.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22893 ( -2.00467 1.49282 )
Norm@50keV : 3.91920E-03 ( -0.0039192 0.00271066 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.246681e-01
Photon flux (15-150 keV) in 1 sec: 0.461992 ( -0.322548 0.326137 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94454e-08 ( -2.91205e-08 3.21244e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 485.364 sec. to 486.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22518 ( -9.68825 -0.921174 )
Epeak [keV] : 9993.03 ( -9997.55 -9997.55 )
Norm@50keV : 3.93737E-03 ( -0.00393703 -0.00393703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 56 degrees of freedom
# Null hypothesis probability = 3.882007e-01
Photon flux (15-150 keV) in 1 sec: 0.462520 ( -0.32279 0.325085 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92986e-08 ( -3.05258e-08 3.19362e-08 ) ergs/cm2
Band function
Time interval is from 485.364 sec. to 486.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.9335 -4.9335 )
beta : -1.56759 ( 1.55614 1.55614 )
Epeak [keV] : 29.5135 ( -29.5136 77.637 )
Norm@50keV : 143.909 ( -143.782 5.95398e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.644939e-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] : 14.3792 (-9.44068 -14.4603)
R^2/D10^2 : 6.02042E-02 (-0.0583645 2.48647)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.018169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.622e-09 1.933e-09
25- 50 1.001e-08 7.095e-09
50-150 1.381e-08 1.173e-08
15-150 2.644e-08 2.082e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-199.361 -199.361)
Norm : 1.89524 (-1.32888 1.33001)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.55 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.184358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.719e-09 3.624e-09
25- 50 9.078e-09 6.985e-09
50-150 1.991e-08 1.539e-08
15-150 3.371e-08 2.470e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 195.322 (-195.379 -195.379)
R1^2/D10^2 : 9.37313E-05 (-9.3748e-05 -9.3748e-05)
kT2 [keV] : 9.10124 (-6.2378 69.0798)
R2^2/D10^2 : 0.251009 (-0.250491 6.65099)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.08 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.624851e-01
# Null hypothesis probability = 3.653403e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.401e-09 3.389e-09
25- 50 9.321e-09 6.575e-09
50-150 2.733e-08 1.321e-08
15-150 4.105e-08 2.440e-08
Plot creation:
Wed Sep 9 18:34:59 EDT 2015