batgrbproduct analysis for trigger=767284
batgrbproduct Analysis for Trigger=767284
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): Fri Aug 11 16:55:15 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger767284/GCN5_download_cron
======================================================================
Trigger: 00767284 Segment: 000
BAT Trigger Time: 524095320.576 [s; MET]
Trigger Stop: 524095321.6 [s; MET]
UTC: 2017-08-10T22:01:41.068440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 187.950444369931 Dec: 3.64679568014333 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.65
Image Trigger?: NO
Rate S/N Ratio: 23.3238075793812 [ if not an image trigger ]
Image S/N Ratio: 9.65
Flight Position: [ source = BAT ]
RA: 187.950444369931 Dec: 3.64679568014333 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 187.928511932623 Dec: 3.66397068362815 [deg; J2000]
{ 12h 31m 42.8s , +03d 39' 50.3" }
+/- 1.00069096274613 [arcmin] (estimated 90% radius based on SNR)
+/- 0.302802855334615 [arcmin] (formal 1-sigma fit error)
SNR: 30.3871409582277
Angular difference between Flight and Ground position is 1.669313 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 152.251999914646 +/- 21.6464926531137
Measured from: -17.7759998440742
to: 134.476000070572 [s; relative to TRIGTIME]
T50: 73.6679999232292 +/- 6.58781451505593
Measured from: 7.10800015926361
to: 80.7760000824928 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.15200001001358
to: 1.15200001001358 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.3319999575615
to: 157.740000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.650495 2.528317 2.178488 0.684521
0.078812 0.083059 0.074628 0.066037 [error]
Peak 0.023480 0.057364 0.053161 0.041127
0.006313 0.007228 0.006861 0.005865 [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 4.76e-07 1.03e-06 1.74e-06 6.75e-06 4.77e-06 9.99e-06 erg/cm2
Error 3.68e-08 4.53e-08 7.46e-08 6.92e-07 1.88e-07 7.26e-07 erg/cm2
Peak flux Power-law 1.89e-01 3.20e-01 4.11e-01 1.06e+00 1.21e+00 1.98e+00 ph/cm2/s
Error 6.35e-02 6.46e-02 5.17e-02 3.22e-01 1.62e-01 3.12e-01 ph/cm2/s
Fluence Cutoff-PL 4.79e-07 1.03e-06 1.74e-06 6.65e-06 4.76e-06 9.88e-06 erg/cm2
Error 3.70e-08 4.55e-08 7.50e-08 -------- -------- 8.96e-07 erg/cm2
Peak flux Cutoff-PL 1.92e-01 3.23e-01 4.11e-01 1.04e+00 1.22e+00 1.96e+00 ph/cm2/s
Error -------- 6.47e-02 -------- -------- 1.62e-01 -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.86e-02 1.50e-01 5.93e-02 2.26e-03 2.90e-01 2.90e-01 ph/cm2/s
Error 9.58e-02 -------- 5.83e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.240 0.070 - - 2.61e-03 9.47e-05 59.810 57
CPL 1.236 0.112 9999.1 0.0 2.62e-03 1.52e-04 59.900 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.637 0.256 - - 1.04e-02 1.52e-03 87.420 57
CPL 0.644 0.259 9999.4 0.0 1.05e-02 3.53e-03 87.480 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: 143.744000 sec.
T50 in the 50-300 keV band: 56.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 182.072 -24.332 157.740
T90 152.252 -17.776 134.476
T50 73.668 7.108 80.776
Peak 1.000 0.152 1.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
187.9285 +3.6640 0.0063 24.4 -166.7 2.5211 30.4 TRIG_00767284
------------------------------------------
Foreground time interval of the image:
-24.332 15.425 (delta_t = 39.757 [sec])
Background time interval of the image:
-239.576 -24.332 (delta_t = 215.244 [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
Time interval is from -24.332 sec. to 157.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23985 ( -0.0702472 0.0697923 )
Norm@50keV : 2.60992E-03 ( -9.47281e-05 9.46752e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.741605e-01
Photon flux (15-150 keV) in 182.1 sec: 0.308182 ( -0.0119444 0.0119983 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76925e-06 ( -1.87077e-07 1.88002e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.332 sec. to 157.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23572 ( -0.106255 0.117491 )
Epeak [keV] : 9999.12 ( -9999.15 -9999.15 )
Norm@50keV : 2.62158E-03 ( -9.47661e-05 0.000208555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 56 degrees of freedom
# Null hypothesis probability = 3.361362e-01
Photon flux (15-150 keV) in 182.1 sec: 0.308125 ( -0.011815 0.011896 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76361e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -24.332 sec. to 157.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.479215 ( 0.815282 0.815282 )
beta : -1.25445 ( -0.0913259 0.0771091 )
Epeak [keV] : 53.5917 ( -53.4416 252.232 )
Norm@50keV : 9.09567E-03 ( -0.00921774 170572 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.48 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.159675e-01
Photon flux (15-150 keV) in 182.1 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] : 19.7481 ( )
R^2/D10^2 : 1.40044E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 266.74 using 59 PHA bins.
# Reduced chi-squared = 4.6797 for 57 degrees of freedom
# Null hypothesis probability = 7.206468e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.927e-07 1.488e-08
25- 50 9.517e-07 5.244e-08
50-150 2.746e-06 1.739e-07
15-150 3.891e-06 1.848e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 ( )
Norm : 1.29723 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.17 using 59 PHA bins.
# Reduced chi-squared = 2.2662 for 57 degrees of freedom
# Null hypothesis probability = 1.599675e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.882e-07 2.367e-08
25- 50 1.132e-06 4.634e-08
50-150 2.482e-06 9.651e-08
15-150 4.201e-06 1.621e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.18530 (-0.826426 0.901115)
R1^2/D10^2 : 0.181856 (-0.0532521 0.0795518)
kT2 [keV] : 40.4264 (-5.75205 8.70856)
R2^2/D10^2 : 1.25627E-03 (-0.000519787 0.000721908)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.65 using 59 PHA bins.
# Reduced chi-squared = 0.8846 for 55 degrees of freedom
# Null hypothesis probability = 7.143304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.558e-07 5.326e-08
25- 50 1.070e-06 9.032e-08
50-150 3.382e-06 5.035e-07
15-150 4.908e-06 6.164e-07
Peak spectrum fit
Power-law model
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.636995 ( -0.268496 0.243215 )
Norm@50keV : 1.04324E-02 ( -0.00155621 0.00149304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.42 using 59 PHA bins.
# Reduced chi-squared = 1.534 for 57 degrees of freedom
# Null hypothesis probability = 5.891228e-03
Photon flux (15-150 keV) in 1 sec: 1.21292 ( -0.16184 0.16249 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31087e-07 ( -1.72964e-08 1.73494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.643631 ( -0.285329 0.231857 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.05246E-02 ( -0.00160093 0.00545151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.48 using 59 PHA bins.
# Reduced chi-squared = 1.562 for 56 degrees of freedom
# Null hypothesis probability = 4.526609e-03
Photon flux (15-150 keV) in 1 sec: 1.21548 ( -0.16487 0.15976 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31266e-07 ( -1.7452e-08 1.6686e-08 ) ergs/cm2
Band function
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.763256 ( 0.763256 0.763256 )
beta : -0.637007 ( -0.243164 0.268507 )
Epeak [keV] : 17.0940 ( -17.094 -17.094 )
Norm@50keV : 1.48842E-02 ( -0.00583962 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.42 using 59 PHA bins.
# Reduced chi-squared = 1.590 for 55 degrees of freedom
# Null hypothesis probability = 3.525443e-03
Photon flux (15-150 keV) in 1 sec: 0.290423 ( ) 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] : 31.4329 (-7.1294 11.8015)
R^2/D10^2 : 1.60257E-02 (-0.0159724 0.0174453)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.96 using 59 PHA bins.
# Reduced chi-squared = 1.8063 for 57 degrees of freedom
# Null hypothesis probability = 1.854656e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.406e-09 7.040e-10
25- 50 1.512e-08 3.931e-09
50-150 1.035e-07 2.450e-08
15-150 1.210e-07 3.139e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 4.74848 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.07 using 59 PHA bins.
# Reduced chi-squared = 2.2293 for 57 degrees of freedom
# Null hypothesis probability = 2.946067e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.182e-08 6.695e-09
25- 50 2.274e-08 1.296e-08
50-150 4.988e-08 2.768e-08
15-150 8.445e-08 4.711e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 81.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 80.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 80.58 using 59 PHA bins.
# Reduced chi-squared = 1.484 for 55 degrees of freedom
# Reduced chi-squared = 1.483 for 55 degrees of freedom
# Reduced chi-squared = 1.465 for 55 degrees of freedom
# Reduced chi-squared = 1.465 for 55 degrees of freedom
# Null hypothesis probability = 1.144426e-02
# Null hypothesis probability = 1.149767e-02
# Null hypothesis probability = 1.385172e-02
# Null hypothesis probability = 1.388492e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.405e-09 3.727e-09
25- 50 2.148e-08 1.217e-08
50-150 1.069e-07 9.320e-08
15-150 1.348e-07 1.130e-07
Plot creation:
Fri Aug 11 17:27:17 EDT 2017