batgrbproduct Analysis for Trigger=680436
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): Sat Mar 26 08:28:51 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger680436/GCN5_download_cron
======================================================================
Trigger: 00680436 Segment: 000
BAT Trigger Time: 480582019.648 [s; MET]
Trigger Stop: 480582020.16 [s; MET]
UTC: 2016-03-25T07:00:03.619340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 15.5965562068455 Dec: -72.7063681344509 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.49
Image Trigger?: NO
Rate S/N Ratio: 25.2784493195291 [ if not an image trigger ]
Image S/N Ratio: 10.49
Flight Position: [ source = BAT ]
RA: 15.5965562068455 Dec: -72.7063681344509 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 15.6974555088243 Dec: -72.7017709975554 [deg; J2000]
{ 01h 02m 47.4s , -72d 42' 06.4" }
+/- 0.539685780655868 [arcmin] (estimated 90% radius based on SNR)
+/- 0.155380971897446 [arcmin] (formal 1-sigma fit error)
SNR: 73.4131956285106
Angular difference between Flight and Ground position is 1.820897 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 64.8959999680519 +/- 14.7472443235028
Measured from: -40.9279998540878
to: 23.9680001139641 [s; relative to TRIGTIME]
T50: 27.2639999985695 +/- 4.45949594892054
Measured from: -35.6159998774529
to: -8.35199987888336 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -33.4599999785423
to: -32.4599999785423 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.744000017643
to: 60.4480000138283 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.415841 3.785247 3.390495 0.941795
0.061724 0.065889 0.059813 0.051660 [error]
Peak 0.131954 0.231759 0.227363 0.074649
0.007648 0.009024 0.008955 0.006854 [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 7.37e-07 1.56e-06 2.58e-06 9.72e-06 7.12e-06 1.46e-05 erg/cm2
Error 3.51e-08 4.26e-08 6.38e-08 5.77e-07 1.62e-07 6.01e-07 erg/cm2
Peak flux Power-law 1.25e+00 1.61e+00 1.50e+00 2.48e+00 5.20e+00 6.84e+00 ph/cm2/s
Error 1.07e-01 8.18e-02 7.20e-02 2.58e-01 2.24e-01 3.16e-01 ph/cm2/s
Fluence Cutoff-PL 7.06e-07 1.57e-06 2.62e-06 7.99e-06 7.06e-06 1.29e-05 erg/cm2
Error 4.63e-08 4.43e-08 7.57e-08 1.46e-06 1.76e-07 1.52e-06 erg/cm2
Peak flux Cutoff-PL 1.19e+00 1.62e+00 1.54e+00 2.00e+00 5.15e+00 6.36e+00 ph/cm2/s
Error 1.31e-01 8.73e-02 8.68e-02 5.72e-01 2.32e-01 7.60e-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 1.271 0.042 - - 6.38e-03 1.39e-04 40.000 57
CPL 1.117 0.165 334.4 -95.3 7.43e-03 1.20e-03 37.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.096 0.075 - - 4.48e-02 1.88e-03 42.000 57
CPL 0.896 0.263 311.8 0.0 5.52e-02 1.54e-02 40.490 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: 42.880000 sec.
T50 in the 50-300 keV band: 8.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 112.192 -51.744 60.448
T90 64.896 -40.928 23.968
T50 27.264 -35.616 -8.352
Peak 1.000 -33.460 -32.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
15.6975 -72.7018 0.0026 19.9 8.4 8.2098 73.4 TRIG_00680436
------------------------------------------
Foreground time interval of the image:
-37.647 9.053 (delta_t = 46.700 [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 -51.744 sec. to 60.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27113 ( -0.0417472 0.0416252 )
Norm@50keV : 6.37605E-03 ( -0.000139416 0.000139282 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.00 using 59 PHA bins.
# Reduced chi-squared = 0.7017 for 57 degrees of freedom
# Null hypothesis probability = 9.574453e-01
Photon flux (15-150 keV) in 112.2 sec: 0.756782 ( -0.0181977 0.0182473 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1205e-06 ( -1.61436e-07 1.61583e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.744 sec. to 60.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11692 ( -0.170456 0.160142 )
Epeak [keV] : 334.405 ( -143.737 -334.408 )
Norm@50keV : 7.42889E-03 ( -0.00107126 0.00132628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.44 using 59 PHA bins.
# Reduced chi-squared = 0.6686 for 56 degrees of freedom
# Null hypothesis probability = 9.732819e-01
Photon flux (15-150 keV) in 112.2 sec: 0.748063 ( -0.020201 0.020279 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06077e-06 ( -1.76008e-07 1.7501e-07 ) ergs/cm2
Band function
Time interval is from -51.744 sec. to 60.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11651 ( 0.771183 5.76068 )
beta : -1.90297 ( 9.20057 18.3455 )
Epeak [keV] : 334.081 ( -72.2946 -334.132 )
Norm@50keV : 7.43003E-03 ( -0.00016011 0.00132449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.44 using 59 PHA bins.
# Reduced chi-squared = 0.6808 for 55 degrees of freedom
# Null hypothesis probability = 9.663545e-01
Photon flux (15-150 keV) in 112.2 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] : 19.8650 ( )
R^2/D10^2 : 3.38863E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 401.00 using 59 PHA bins.
# Reduced chi-squared = 7.0351 for 57 degrees of freedom
# Null hypothesis probability = 3.442914e-53
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.900e-07 1.408e-08
25- 50 1.438e-06 4.937e-08
50-150 4.203e-06 1.403e-07
15-150 5.931e-06 1.453e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.23152 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 194.67 using 59 PHA bins.
# Reduced chi-squared = 3.4153 for 57 degrees of freedom
# Null hypothesis probability = 6.144933e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.029e-07 2.216e-08
25- 50 1.737e-06 4.208e-08
50-150 3.809e-06 8.808e-08
15-150 6.449e-06 1.464e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.14184 (-0.788168 0.85816)
R1^2/D10^2 : 0.388529 (-0.105382 0.157134)
kT2 [keV] : 31.9039 (-2.65761 3.4989)
R2^2/D10^2 : 5.96663E-03 (-0.00175101 0.00207887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.21 using 59 PHA bins.
# Reduced chi-squared = 0.8220 for 55 degrees of freedom
# Null hypothesis probability = 8.239409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.318e-07 5.206e-08
25- 50 1.603e-06 7.349e-08
50-150 4.805e-06 2.749e-07
15-150 7.040e-06 3.394e-07
Peak spectrum fit
Power-law model
Time interval is from -33.460 sec. to -32.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09578 ( -0.0753144 0.0749413 )
Norm@50keV : 4.48163E-02 ( -0.00188339 0.00188283 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.00 using 59 PHA bins.
# Reduced chi-squared = 0.7369 for 57 degrees of freedom
# Null hypothesis probability = 9.314887e-01
Photon flux (15-150 keV) in 1 sec: 5.19628 ( -0.223562 0.223768 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69199e-07 ( -2.20687e-08 2.21439e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.460 sec. to -32.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.895936 ( -0.294535 0.230802 )
Epeak [keV] : 311.846 ( -311.846 -311.846 )
Norm@50keV : 5.52305E-02 ( -0.011689 0.0191614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.49 using 59 PHA bins.
# Reduced chi-squared = 0.7231 for 56 degrees of freedom
# Null hypothesis probability = 9.410043e-01
Photon flux (15-150 keV) in 1 sec: 5.14978 ( -0.23221 0.23222 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64447e-07 ( -2.3406e-08 2.3285e-08 ) ergs/cm2
Band function
Time interval is from -33.460 sec. to -32.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.554736 ( 0.614858 0.614858 )
beta : -1.16772 ( 1.16711 0.123364 )
Epeak [keV] : 105.462 ( -104.929 633.91 )
Norm@50keV : 9.12285E-02 ( -0.0480204 1379.72 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.41 using 59 PHA bins.
# Reduced chi-squared = 0.7348 for 55 degrees of freedom
# Null hypothesis probability = 9.295234e-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] : 20.6637 ( )
R^2/D10^2 : 0.220021 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 143.85 using 59 PHA bins.
# Reduced chi-squared = 2.5237 for 57 degrees of freedom
# Null hypothesis probability = 1.871319e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.787e-08 1.430e-09
25- 50 9.093e-08 5.535e-09
50-150 2.890e-07 2.145e-08
15-150 3.977e-07 2.130e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 21.2105 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.09 using 59 PHA bins.
# Reduced chi-squared = 2.4578 for 57 degrees of freedom
# Null hypothesis probability = 6.015524e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.282e-08 2.435e-09
25- 50 1.016e-07 4.775e-09
50-150 2.228e-07 1.225e-08
15-150 3.772e-07 1.750e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.31639 (-1.34919 1.51391)
R1^2/D10^2 : 2.28197 (-0.891299 1.71834)
kT2 [keV] : 34.3941 (-4.7908 7.5214)
R2^2/D10^2 : 3.73087E-02 (-0.0171129 0.0235942)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.60 using 59 PHA bins.
# Reduced chi-squared = 0.7018 for 55 degrees of freedom
# Null hypothesis probability = 9.543062e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.565e-08 6.545e-09
25- 50 9.594e-08 1.311e-08
50-150 3.378e-07 5.420e-08
15-150 4.694e-07 6.370e-08
Plot creation:
Sat Mar 26 08:35:14 EDT 2016