batgrbproduct analysis for trigger=868839
batgrbproduct Analysis for Trigger=868839
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): Sat Oct 27 01:37:50 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger868839/GCN5_download_cron
======================================================================
Trigger: 00868839 Segment: 000
BAT Trigger Time: 562210928 [s; MET]
Trigger Stop: 562210992 [s; MET]
UTC: 2018-10-26T01:41:46.185780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.815388994994 Dec: -15.7824760628516 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.99
Flight Position: [ source = BAT ]
RA: 244.815388994994 Dec: -15.7824760628516 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.838589126193 Dec: -15.767496956613 [deg; J2000]
{ 16h 19m 21.3s , -15d 46' 03.0" }
+/- 0.958823837654258 [arcmin] (estimated 90% radius based on SNR)
+/- 0.309346630181702 [arcmin] (formal 1-sigma fit error)
SNR: 32.3002420033756
Angular difference between Flight and Ground position is 1.613140 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 642.231999874115 +/- 57.1343937838596
Measured from: -85.6039998531342
to: 556.628000020981 [s; relative to TRIGTIME]
T50: 323.74799990654 +/- 31.270069620643
Measured from: 12.7120001316071
to: 336.460000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 147.536000013351
to: 148.536000013351 [s; relative to TRIGTIME]
Total Fluence
Measured from: -121.488000035286
to: 851.460000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 38.528869 3.356454 -0.309707 -0.005447
0.339127 0.301573 0.254711 0.225900 [error]
Peak 0.085109 0.012283 0.015492 0.003354
0.011308 0.009874 0.008340 0.007399 [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 1.39e-05 1.54e-06 7.13e-08 3.46e-09 1.55e-05 1.55e-05 erg/cm2
Error 1.13e-06 1.59e-07 1.97e-08 1.65e-09 1.11e-06 1.11e-06 erg/cm2
Peak flux Power-law 8.61e-01 1.84e-01 1.97e-02 2.32e-03 1.07e+00 1.07e+00 ph/cm2/s
Error 2.05e-01 1.03e-01 2.91e-02 7.07e-03 2.62e-01 2.63e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-05 1.13e-06 7.28e-10 8.28e-17 1.44e-05 1.44e-05 erg/cm2
Error 1.31e-06 1.99e-07 2.53e-09 7.60e-14 1.33e-06 1.33e-06 erg/cm2
Peak flux Cutoff-PL 8.62e-01 1.77e-01 1.77e-02 1.99e-03 1.06e+00 1.06e+00 ph/cm2/s
Error 2.04e-01 1.04e-01 2.92e-02 7.05e-03 2.63e-01 2.62e-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 6.429 0.263 - - 8.52e-05 1.92e-05 79.610 57
CPL 1.000 0.000 50.0 0.0 1.43e-03 0.00e+00 700.640 56
The chi2 of BB fit is 60.43 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 4.221 1.086 - - 1.42e-03 1.69e-03 55.190 57
CPL 1.000 0.000 50.0 0.0 1.63e-02 0.00e+00 79.790 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 972.948 -121.488 851.460
T90 642.232 -85.604 556.628
T50 323.748 12.712 336.460
Peak 1.000 147.536 148.536
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.8386 -15.7675 0.0059 28.4 -61.6 39.0381 32.3 TRIG_00868839
------------------------------------------
Foreground time interval of the image:
-17.699 779.740 (delta_t = 797.439 [sec])
781.000 851.460 (delta_t = 70.460 [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
Multiple GTIs in the spectrum
tstart tstop
-121.488000 779.740000
781.000000 851.460000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.42895 ( -0.262905 0.262215 )
Norm@50keV : 8.51706E-05 ( -1.74271e-05 2.09805e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.61 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.560940e-02
Photon flux (15-150 keV) in 971.7 sec: 0.541070 ( -0.04206 0.0425361 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54858e-05 ( -1.10265e-06 1.11361e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-121.488000 779.740000
781.000000 851.460000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.43377E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 700.64 using 59 PHA bins.
# Reduced chi-squared = 12.511 for 56 degrees of freedom
# Null hypothesis probability = 3.593242e-112
Photon flux (15-150 keV) in 971.7 sec: 0.503150 ( -0.05158 0.050176 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44259e-05 ( -1.34687e-06 1.30927e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-121.488000 779.740000
781.000000 851.460000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.37658 ( -2.21963 1.86603 )
beta : -8.65336 ( 8.53341 1.20603 )
Epeak [keV] : 9.35831 ( -1.70116 2.36833 )
Norm@50keV : 168.151 ( -171.39 48676.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.33 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 55 degrees of freedom
# Null hypothesis probability = 3.207630e-01
Photon flux (15-150 keV) in 971.7 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] : 2.57982 (-0.116078 0.126981)
R^2/D10^2 : 197.680 (-67.1429 98.8994)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.530404e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.320e-05 1.598e-06
25- 50 1.100e-06 1.442e-07
50-150 4.705e-10 2.385e-10
15-150 1.430e-05 1.462e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.35124 (-0.280749 0.318637)
Norm : 204.755 (-60.3919 83.9048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.80 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.086829e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.363e-05 1.564e-06
25- 50 1.236e-06 1.618e-07
50-150 3.024e-09 1.304e-09
15-150 1.487e-05 1.594e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.54539 (-2.52239 0.167643)
R1^2/D10^2 : 215.315 (-92.7179 199.278)
kT2 [keV] : 6.60539 (-6.65146 -6.65146)
R2^2/D10^2 : 1.54687E-02 (-0.0243021 277.396)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.058271e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.317e-05 2.310e-06
25- 50 1.153e-06 3.688e-07
50-150 1.651e-08 2.262e-08
15-150 1.434e-05 2.954e-06
Peak spectrum fit
Power-law model
Time interval is from 147.536 sec. to 148.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.22108 ( -0.947094 1.2243 )
Norm@50keV : 1.42167E-03 ( -0.00142167 0.00195396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.19 using 59 PHA bins.
# Reduced chi-squared = 0.9683 for 57 degrees of freedom
# Null hypothesis probability = 5.431739e-01
Photon flux (15-150 keV) in 1 sec: 1.06596 ( -0.261727 0.263181 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69468e-08 ( -1.08888e-08 1.26664e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 147.536 sec. to 148.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.63134E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.79 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 56 degrees of freedom
# Null hypothesis probability = 2.007478e-02
Photon flux (15-150 keV) in 1 sec: 1.06188 1.03999 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22604e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 147.536 sec. to 148.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.77799 ( 1.77799 1.77799 )
beta : -5.43703 ( 5.36384 2.0534 )
Epeak [keV] : 1.93436 ( -1.93407 3.5548 )
Norm@50keV : 0.142904 ( -0.0734721 3.59776e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.97 using 59 PHA bins.
# Reduced chi-squared = 0.9995 for 55 degrees of freedom
# Null hypothesis probability = 4.756191e-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] : 3.36593 (-0.748002 0.885932)
R^2/D10^2 : 73.2582 (-73.2583 271.319)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.08 using 59 PHA bins.
# Reduced chi-squared = 0.9663 for 57 degrees of freedom
# Null hypothesis probability = 5.473914e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.705e-08 1.526e-08
25- 50 5.793e-09 3.773e-09
50-150 2.252e-11 2.358e-11
15-150 3.286e-08 1.838e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.26595 (-2.46417 4.20206)
Norm : 76.1464 (-48.4928 179.913)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 57 degrees of freedom
# Null hypothesis probability = 5.460926e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.637e-08 1.536e-08
25- 50 6.984e-09 4.503e-09
50-150 1.771e-10 1.861e-10
15-150 3.353e-08 1.896e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.24468 (-0.741158 0.846533)
R1^2/D10^2 : 88.5677 (-65.1603 249.643)
kT2 [keV] : 51.6270 (-34.4925 -51.6196)
R2^2/D10^2 : 9.98490E-04 (-0.000970009 0.0189516)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.00 using 59 PHA bins.
# Reduced chi-squared = 0.9090 for 55 degrees of freedom
# Null hypothesis probability = 6.657178e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.680e-08 1.469e-08
25- 50 7.104e-09 3.760e-09
50-150 2.601e-08 1.689e-08
15-150 5.991e-08 3.111e-08
Plot creation:
Sat Oct 27 01:42:42 EDT 2018