batgrbproduct analysis for trigger=783893
batgrbproduct Analysis for Trigger=783893
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 30 17:06:05 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger783893/GCN5_download_cron
======================================================================
Trigger: 00783893 Segment: 000
BAT Trigger Time: 530951324.544 [s; MET]
Trigger Stop: 530951326.592 [s; MET]
UTC: 2017-10-29T06:28:24.628960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.757649933822 Dec: 67.8594938723684 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.62
Image Trigger?: NO
Rate S/N Ratio: 24.1246761636296 [ if not an image trigger ]
Image S/N Ratio: 6.62
Flight Position: [ source = BAT ]
RA: 335.757649933822 Dec: 67.8594938723684 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.732987126533 Dec: 67.8607751202439 [deg; J2000]
{ 22h 22m 55.9s , +67d 51' 38.8" }
+/- 3.44065059892947 [arcmin] (estimated 90% radius based on SNR)
+/- 2.13552454163656 [arcmin] (formal 1-sigma fit error)
SNR: 5.20581813032153
Angular difference between Flight and Ground position is 0.562952 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
T50: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04799997806549 second)
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.046656 0.047317 0.001525 0.003477
0.011677 0.011417 0.008382 0.006980 [error]
Peak 0.046656 0.047317 0.001525 0.003477
0.011677 0.011417 0.008382 0.006980 [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 1.16e-08 1.32e-08 1.07e-08 1.46e-08 4.08e-08 5.04e-08 erg/cm2
Error 4.46e-09 4.74e-09 6.37e-09 1.85e-08 1.64e-08 2.65e-08 erg/cm2
Peak flux Power-law 1.86e-01 1.17e-01 4.79e-02 2.65e-02 3.64e-01 3.77e-01 ph/cm2/s
Error 7.25e-02 4.13e-02 2.76e-02 3.15e-02 1.22e-01 1.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.29e-08 2.01e-08 6.76e-10 9.58e-15 3.36e-08 3.36e-08 erg/cm2
Error 5.42e-09 8.34e-09 2.59e-09 2.63e-11 1.06e-08 1.06e-08 erg/cm2
Peak flux Cutoff-PL 1.93e-01 1.91e-01 3.76e-03 2.81e-08 3.88e-01 3.88e-01 ph/cm2/s
Error 8.46e-02 7.21e-02 1.33e-02 7.33e-05 1.13e-01 1.13e-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 2.289 0.565 - - 2.10e-03 9.61e-04 65.750 57
CPL -7.205 -0.755 27.8 4.5 1.14e+04 8.97e+05 54.560 56
The chi2 of BB fit is 57.15 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 2.289 0.565 - - 2.10e-03 9.61e-04 65.750 57
CPL -7.205 -0.755 27.8 4.5 1.14e+04 8.97e+05 54.560 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.7330 +67.8608 0.0367 12.9 -106.2 0.1008 5.2 TRIG_00783893
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-239.544 -12.544 (delta_t = 227.000 [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 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28925 ( -0.525192 0.604783 )
Norm@50keV : 2.09726E-03 ( -0.000950421 0.000972512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 1.997995e-01
Photon flux (15-150 keV) in 2.048 sec: 0.364272 ( -0.122026 0.122398 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08312e-08 ( -1.57193e-08 1.70822e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.20489 ( 7.20254 5.69319 )
Epeak [keV] : 27.8303 ( -3.89532 5.05906 )
Norm@50keV : 1.13911E+04 ( -11280.7 1.78351e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.293706e-01
Photon flux (15-150 keV) in 2.048 sec: 0.387997 ( -0.111615 0.113422 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36224e-08 ( -1.01849e-08 1.09933e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97909 ( -3.70186 -4.97909 )
beta : -9.37163 ( 9.37163 6.4463 )
Epeak [keV] : 28.3186 ( -4.40517 4.91982 )
Norm@50keV : 274.315 ( -76.2962 792.413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 55 degrees of freedom
# Null hypothesis probability = 4.795503e-01
Photon flux (15-150 keV) in 2.048 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] : 7.21311 (-1.44926 1.81294)
R^2/D10^2 : 0.750251 (-0.463604 1.11973)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.695421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.323e-08 7.978e-09
25- 50 1.920e-08 1.111e-08
50-150 3.541e-09 2.897e-09
15-150 3.597e-08 2.176e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.6593 (-13.3489 34.3742)
Norm : 2.98777 (-1.34659 2.25817)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.70 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.813174e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.279e-08 6.978e-09
25- 50 1.504e-08 9.123e-09
50-150 8.831e-09 7.573e-09
15-150 3.666e-08 2.064e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.20685E-05 (-1.20259e-05 -1.20259e-05)
kT2 [keV] : 7.12392 (-1.47389 1.78896)
R2^2/D10^2 : 0.776909 (-0.479139 1.2187)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 3.952314e-01
# Null hypothesis probability = 4.060568e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.324e-08 6.484e-01
25- 50 1.919e-08 5.694e+00
50-150 3.535e-09 1.560e+02
15-150 3.597e-08 1.470e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28925 ( -0.525192 0.604783 )
Norm@50keV : 2.09726E-03 ( -0.000950421 0.000972512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 1.997995e-01
Photon flux (15-150 keV) in 2.048 sec: 0.364272 ( -0.122026 0.122398 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08312e-08 ( -1.57193e-08 1.70822e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.20489 ( 7.20254 5.69319 )
Epeak [keV] : 27.8303 ( -3.89532 5.05906 )
Norm@50keV : 1.13911E+04 ( -11280.7 1.78299e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.293706e-01
Photon flux (15-150 keV) in 2.048 sec: 0.387997 ( -0.111615 0.113422 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36224e-08 ( -1.01849e-08 1.09933e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97909 ( -3.70553 -4.97909 )
beta : -9.37163 ( 9.37163 6.4463 )
Epeak [keV] : 28.3186 ( -4.40517 4.91982 )
Norm@50keV : 274.315 ( -76.2962 792.413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 55 degrees of freedom
# Null hypothesis probability = 4.795503e-01
Photon flux (15-150 keV) in 2.048 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] : 7.21311 (-1.44926 1.81294)
R^2/D10^2 : 0.750251 (-0.463604 1.11973)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.695421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.323e-08 8.064e-09
25- 50 1.920e-08 1.204e-08
50-150 3.541e-09 3.088e-09
15-150 3.597e-08 2.208e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.6593 (-13.3489 34.3742)
Norm : 2.98777 (-1.34659 2.25817)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.70 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.813174e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.279e-08 6.920e-09
25- 50 1.504e-08 9.296e-09
50-150 8.831e-09 7.671e-09
15-150 3.666e-08 2.254e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.20685E-05 (-1.20259e-05 -1.20259e-05)
kT2 [keV] : 7.12392 (-1.47389 1.78896)
R2^2/D10^2 : 0.776909 (-0.479139 1.2187)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 3.952314e-01
# Null hypothesis probability = 4.060568e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.324e-08 6.969e-01
25- 50 1.919e-08 5.760e+00
50-150 3.535e-09 1.513e+02
15-150 3.597e-08 1.467e+02
Plot creation:
Mon Oct 30 17:12:57 EDT 2017