batgrbproduct analysis for trigger=864584
batgrbproduct Analysis for Trigger=864584
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): Mon Oct 1 14:53:45 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger864584/GCN5_download_cron
======================================================================
Trigger: 00864584 Segment: 000
BAT Trigger Time: 560004250.944 [s; MET]
Trigger Stop: 560004251.968 [s; MET]
UTC: 2018-09-30T12:43:49.266800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.8702927582825 Dec: -25.1383099129713 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.59
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 7.59
Flight Position: [ source = BAT ]
RA: 76.8702927582825 Dec: -25.1383099129713 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.8939909691127 Dec: -25.1237729345108 [deg; J2000]
{ 05h 07m 34.6s , -25d 07' 25.6" }
+/- 2.23378231730094 [arcmin] (estimated 90% radius based on SNR)
+/- 0.982984296750699 [arcmin] (formal 1-sigma fit error)
SNR: 9.64913974312665
Angular difference between Flight and Ground position is 1.554958 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 6.79999995231628 +/- 0.948027340301586
Measured from: -2.97599983215332
to: 3.82400012016296 [s; relative to TRIGTIME]
T50: 2.71599996089935 +/- 1.9464059888242
Measured from: -0.671999931335449
to: 2.0440000295639 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.139999985694885
to: 1.13999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.24399995803833
to: 4.2039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.130491 0.158345 0.058302 0.027789
0.018574 0.019477 0.017105 0.015370 [error]
Peak 0.038410 0.044122 0.008509 0.000796
0.007155 0.007305 0.006478 0.005744 [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 3.99e-08 5.90e-08 6.50e-08 1.35e-07 2.05e-07 2.99e-07 erg/cm2
Error 8.42e-09 8.75e-09 1.64e-08 6.81e-08 3.78e-08 8.54e-08 erg/cm2
Peak flux Power-law 4.27e-01 2.86e-01 1.25e-01 7.55e-02 8.76e-01 9.14e-01 ph/cm2/s
Error 1.09e-01 6.04e-02 4.97e-02 5.59e-02 1.74e-01 1.87e-01 ph/cm2/s
Fluence Cutoff-PL 3.97e-08 5.98e-08 6.48e-08 1.09e-07 2.02e-07 2.72e-07 erg/cm2
Error 8.70e-09 1.14e-08 1.84e-08 1.06e-07 4.43e-08 1.15e-07 erg/cm2
Peak flux Cutoff-PL 4.17e-01 3.12e-01 1.10e-01 2.04e-02 8.55e-01 8.60e-01 ph/cm2/s
Error 1.18e-01 9.29e-02 8.71e-02 6.79e-02 1.82e-01 2.08e-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 1.859 0.278 - - 2.99e-03 5.49e-04 53.800 57
CPL 1.746 1.050 91.7 -0.0 3.49e-03 1.42e-02 53.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.193 0.411 - - 5.31e-03 1.60e-03 56.930 57
CPL 1.486 2.116 25.5 0.0 1.52e-02 0.00e+00 56.670 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 7.448 -3.244 4.204
T90 6.800 -2.976 3.824
T50 2.716 -0.672 2.044
Peak 1.000 0.140 1.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.8940 -25.1238 0.0199 26.8 -167.6 0.3779 9.6 TRIG_00864584
------------------------------------------
Foreground time interval of the image:
-3.244 4.204 (delta_t = 7.448 [sec])
Background time interval of the image:
-105.543 -25.412 (delta_t = 80.131 [sec])
-23.944 -3.244 (delta_t = 20.700 [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 -3.244 sec. to 4.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85858 ( -0.268861 0.287126 )
Norm@50keV : 2.99398E-03 ( -0.000558226 0.000539596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.80 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 57 degrees of freedom
# Null hypothesis probability = 5.959721e-01
Photon flux (15-150 keV) in 7.448 sec: 0.422309 ( -0.0623687 0.0623711 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05017e-07 ( -3.72007e-08 3.83655e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.244 sec. to 4.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74578 ( -1.51033 0.589126 )
Epeak [keV] : 91.7302 ( -97.3377 -97.3544 )
Norm@50keV : 3.49069E-03 ( -0.00344136 0.0250359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9603 for 56 degrees of freedom
# Null hypothesis probability = 5.595514e-01
Photon flux (15-150 keV) in 7.448 sec: 0.420732 ( -0.063704 0.063548 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02411e-07 ( -4.81029e-08 4.05462e-08 ) ergs/cm2
Band function
Time interval is from -3.244 sec. to 4.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.871427 ( 1.13948 2.70549 )
beta : -2.14201 ( 2.08143 0.454422 )
Epeak [keV] : 39.6208 ( -39.3164 -39.3164 )
Norm@50keV : 1.27724E-02 ( -0.0139786 363.28 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9637 for 55 degrees of freedom
# Null hypothesis probability = 5.512309e-01
Photon flux (15-150 keV) in 7.448 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] : 9.62057 (-1.49644 1.84463)
R^2/D10^2 : 0.230636 (-0.112515 0.207903)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.42 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.205639e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.192e-08 9.310e-09
25- 50 7.505e-08 1.595e-08
50-150 3.498e-08 1.490e-08
15-150 1.420e-07 3.035e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.1166 (-33.5556 86.7941)
Norm : 1.96969 (-0.401291 0.536362)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.09 using 59 PHA bins.
# Reduced chi-squared = 0.9490 for 57 degrees of freedom
# Null hypothesis probability = 5.848904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.813e-08 7.906e-09
25- 50 6.316e-08 1.243e-08
50-150 9.072e-08 5.660e-08
15-150 1.920e-07 7.530e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.92231 (-1.91583 1.86623)
R1^2/D10^2 : 0.425587 (-0.212744 0.588715)
kT2 [keV] : 58.0670 (-55.4257 -77.2108)
R2^2/D10^2 : 3.42182E-04 (-0.000146442 0.00580564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.41 using 59 PHA bins.
# Reduced chi-squared = 0.9348 for 55 degrees of freedom
# Null hypothesis probability = 6.124614e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.655e-08 1.723e-08
25- 50 6.766e-08 2.928e-08
50-150 1.025e-07 6.056e-08
15-150 2.067e-07 8.820e-08
Peak spectrum fit
Power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19320 ( -0.380996 0.440197 )
Norm@50keV : 5.30879E-03 ( -0.0016296 0.00157773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.93 using 59 PHA bins.
# Reduced chi-squared = 0.9988 for 57 degrees of freedom
# Null hypothesis probability = 4.776709e-01
Photon flux (15-150 keV) in 1 sec: 0.875759 ( -0.173896 0.17398 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98667e-08 ( -1.27002e-08 1.35019e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48586 ( -3.61414 0.618608 )
Epeak [keV] : 25.4841 ( )
Norm@50keV : 1.51966E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.499198e-01
Photon flux (15-150 keV) in 1 sec: 0.855248 ( -0.179591 0.185302 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48772e-08 ( -1.33561e-08 1.77274e-08 ) ergs/cm2
Band function
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08125 ( 1.08074 1.08074 )
beta : -2.80715 ( 2.70978 0.84127 )
Epeak [keV] : 27.6703 ( -27.9785 18.5715 )
Norm@50keV : 2.86904E-02 ( -0.0336553 1974.78 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.302998e-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] : 8.03882 (-1.53767 1.84541)
R^2/D10^2 : 0.970807 (-0.546671 1.28284)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.67 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.140560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.139e-08 4.224e-09
25- 50 2.009e-08 7.444e-09
50-150 5.361e-09 3.601e-09
15-150 3.684e-08 1.276e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.6339 (-17.5997 41.6514)
Norm : 5.46976 (-1.72331 2.79865)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 0.9940 for 57 degrees of freedom
# Null hypothesis probability = 4.879268e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.282e-08 3.363e-09
25- 50 1.732e-08 5.755e-09
50-150 1.435e-08 8.314e-09
15-150 4.449e-08 1.614e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43738 (-7.44017 1.77749)
R1^2/D10^2 : 1.26164 (-0.712558 2.20777)
kT2 [keV] : 198.095 (-198.643 -198.643)
R2^2/D10^2 : 6.17165E-05 (-5.60113e-05 0.814565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.55 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.147051e-01
# Null hypothesis probability = 4.537798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.244e-08 5.930e-09
25- 50 1.863e-08 1.068e-08
50-150 8.097e-09 5.390e-09
15-150 3.917e-08 2.105e-08
Plot creation:
Mon Oct 1 14:58:02 EDT 2018