batgrbproduct analysis for trigger=873178
batgrbproduct Analysis for Trigger=873178
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 Nov 23 10:50:17 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger873178/batgroup_hand_proc
======================================================================
Trigger: 00873178 Segment: 000
BAT Trigger Time: 564639584 [s; MET]
Trigger Stop: 564639648 [s; MET]
UTC: 2018-11-23T04:19:22.034600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 284.650701554987 Dec: -8.23728308797485 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.73
Flight Position: [ source = BAT ]
RA: 284.650701554987 Dec: -8.23728308797485 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 284.6507 Dec: -8.2373 [deg; J2000]
{ 18h 58m 36.2s , -08d 14' 4.3" }
+/- 2.27003324197 [arcmin] (estimated 90% radius based on SNR)
SNR: 9.431
Angular difference between Flight and Ground position is 0.0012 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 220.927999973297 +/- 55.8806500272087
Measured from: -45.0800000429153
to: 175.847999930382 [s; relative to TRIGTIME]
T50: 101.439999938011 +/- 47.749661787425
Measured from: 3.11199998855591
to: 104.551999926567 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -36.460000038147
to: -35.460000038147 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.3359999656677
to: 187.368000030518 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.419666 0.976839 -0.000213 0.013005
0.117318 0.115365 0.098119 0.086687 [error]
Peak 0.007109 0.019518 0.008195 0.008409
0.007340 0.007122 0.006340 0.005649 [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 4.12e-07 3.32e-07 1.81e-07 1.44e-07 9.90e-07 1.07e-06 erg/cm2
Error 5.76e-08 5.61e-08 6.25e-08 8.95e-08 1.60e-07 2.06e-07 erg/cm2
Peak flux Power-law 9.42e-02 8.72e-02 5.59e-02 5.50e-02 2.60e-01 2.92e-01 ph/cm2/s
Error 8.06e-02 7.06e-02 4.51e-02 9.63e-02 1.60e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 4.06e-07 3.84e-07 8.94e-08 2.98e-09 8.82e-07 8.82e-07 erg/cm2
Error 6.23e-08 7.25e-08 7.03e-08 1.82e-08 1.38e-07 1.39e-07 erg/cm2
Peak flux Cutoff-PL 2.64e-02 1.38e-01 5.80e-02 4.38e-04 2.23e-01 2.23e-01 ph/cm2/s
Error 6.34e-02 1.11e-01 6.09e-02 1.52e-02 1.36e-01 1.36e-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 2.878 0.305 - - 3.50e-04 9.08e-05 72.320 57
CPL 0.673 1.611 18.4 0.0 1.15e-02 0.00e+00 65.570 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.647 1.133 - - 1.99e-03 1.35e-03 56.830 57
CPL -5.975 0.000 47.2 0.0 1.93e+01 0.00e+00 53.390 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 248.704 -61.336 187.368
T90 220.928 -45.080 175.848
T50 101.440 3.112 104.552
Peak 1.000 -36.460 -35.460
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
284.651 -8.23728 0.0 9.686 -21.6340 2.651974 9.431 TRIG_00873178
Foreground time interval of the image:
-61.336 187.368 (delta_t = 248.704 [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 -61.336 sec. to 187.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.87768 ( -0.287157 0.323247 )
Norm@50keV : 3.49653E-04 ( -8.87295e-05 9.29197e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.32 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.305649e-02
Photon flux (15-150 keV) in 248.7 sec: 8.81032E-02 ( -0.0110679 0.0110813 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90284e-07 ( -1.5595e-07 1.64715e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.336 sec. to 187.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.673205 ( -2.07433 1.14829 )
Epeak [keV] : 18.3778 ( )
Norm@50keV : 1.15273E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.57 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 56 degrees of freedom
# Null hypothesis probability = 1.788458e-01
Photon flux (15-150 keV) in 248.7 sec: 8.59982E-02 ( -0.0107699 0.0108218 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81674e-07 ( -1.30737e-07 1.45363e-07 ) ergs/cm2
Band function
Time interval is from -61.336 sec. to 187.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.653194 ( -0.94789 0.977291 )
beta : -9.99949 ( 9.99949 19.9987 )
Epeak [keV] : 18.4702 ( -6.99208 5.28035 )
Norm@50keV : 1.19109E-02 ( -0.0119109 0.34706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.57 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 55 degrees of freedom
# Null hypothesis probability = 1.556410e-01
Photon flux (15-150 keV) in 248.7 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] : 5.99762 (-0.781093 0.871286)
R^2/D10^2 : 0.328246 (-0.146724 0.28241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.10 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.307341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.900e-07 7.797e-08
25- 50 3.885e-07 8.767e-08
50-150 3.552e-08 1.814e-08
15-150 8.140e-07 1.500e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8299 (-4.73814 6.44629)
Norm : 1.03080 (-0.270748 0.400728)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.07 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.921868e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.112e-07 6.615e-08
25- 50 3.714e-07 7.859e-08
50-150 1.190e-07 6.235e-08
15-150 9.016e-07 1.640e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.65369 (-2.20933 1.97989)
R1^2/D10^2 : 1.66269 (-1.37465 564.66)
kT2 [keV] : 8.31240 (-6.86292 5.31991)
R2^2/D10^2 : 5.33569E-02 (-0.0524467 0.234989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.95 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.687095e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.086e-07 2.103e-07
25- 50 3.842e-07 2.053e-07
50-150 9.510e-08 5.731e-08
15-150 8.879e-07 4.444e-07
Peak spectrum fit
Power-law model
Time interval is from -36.460 sec. to -35.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64692 ( -1.02471 1.24107 )
Norm@50keV : 1.99383E-03 ( -0.00137265 0.00132394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 0.9970 for 57 degrees of freedom
# Null hypothesis probability = 4.813936e-01
Photon flux (15-150 keV) in 1 sec: 0.260018 ( -0.160328 0.160571 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85844e-08 ( -1.23439e-08 1.37782e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.460 sec. to -35.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.97515 ( )
Epeak [keV] : 47.1932 ( )
Norm@50keV : 19.3393 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.39 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 56 degrees of freedom
# Null hypothesis probability = 5.740834e-01
Photon flux (15-150 keV) in 1 sec: 0.222636 ( -0.121584 0.149529 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49182e-08 ( -8.02716e-09 9.9708e-09 ) ergs/cm2
Band function
Time interval is from -36.460 sec. to -35.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.97640 ( -5.42143 -3.24889 )
beta : -9.98373 ( 9.89301 8.30128 )
Epeak [keV] : 47.4295 ( -13.469 18.6867 )
Norm@50keV : 2.05956 ( -2.14886 12.3445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.56 using 59 PHA bins.
# Reduced chi-squared = 0.9738 for 55 degrees of freedom
# Null hypothesis probability = 5.298136e-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] : 12.4231 (-4.41624 7.38037)
R^2/D10^2 : 6.80197E-02 (-0.0675773 0.242358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.28 using 59 PHA bins.
# Reduced chi-squared = 0.9523 for 57 degrees of freedom
# Null hypothesis probability = 5.777218e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.225e-09 1.496e-09
25- 50 7.288e-09 4.763e-09
50-150 6.917e-09 6.005e-09
15-150 1.643e-08 1.198e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9021 (-99.9371 -99.9371)
Norm : 1.19015 (-0.745198 1.37923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.39 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 57 degrees of freedom
# Null hypothesis probability = 4.977759e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.111e-09 2.096e-09
25- 50 5.378e-09 3.555e-09
50-150 8.710e-09 7.425e-09
15-150 1.720e-08 1.405e-08
Double BB
# Reduced chi-squared = 0.9642 for 55 degrees of freedom
# Reduced chi-squared = 0.9624 for 55 degrees of freedom
# Reduced chi-squared = 0.9615 for 55 degrees of freedom
# Reduced chi-squared = 0.9610 for 55 degrees of freedom
# Reduced chi-squared = 0.9608 for 55 degrees of freedom
# Null hypothesis probability = 5.020622e-01
# Null hypothesis probability = 5.115164e-01
# Null hypothesis probability = 5.431041e-01
# Null hypothesis probability = 5.501494e-01
# Null hypothesis probability = 5.541063e-01
# Null hypothesis probability = 5.560465e-01
# Null hypothesis probability = 5.569945e-01
# Null hypothesis probability = 5.574523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Nov 23 13:40:09 EST 2018