batgrbproduct analysis for trigger=782859
batgrbproduct Analysis for Trigger=782859
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 Oct 27 12:30:01 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger782859/GCN5_download_cron
======================================================================
Trigger: 00782859 Segment: 000
BAT Trigger Time: 530681064.256 [s; MET]
Trigger Stop: 530681064.768 [s; MET]
UTC: 2017-10-26T03:24:04.357080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 40.9337458645185 Dec: 61.4331743208077 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.94
Image Trigger?: NO
Rate S/N Ratio: 30.2654919008431 [ if not an image trigger ]
Image S/N Ratio: 14.94
Flight Position: [ source = BAT ]
RA: 40.9337458645185 Dec: 61.4331743208077 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.8697943080777 Dec: 61.4267531002418 [deg; J2000]
{ 02h 43m 28.8s , +61d 25' 36.3" }
+/- 4.11521028521016 [arcmin] (estimated 90% radius based on SNR)
+/- 2.93554664520052 [arcmin] (formal 1-sigma fit error)
SNR: 4.03102486096603
Angular difference between Flight and Ground position is 1.875032 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 928 +/- 22.6274169979695
Measured from: -15.2558999061584
to: 912.744100093842 [s; relative to TRIGTIME]
T50: 416 +/- 22.6274169979695
Measured from: 368.744100093842
to: 784.744100093842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 616.244100034237
to: 617.244100034237 [s; relative to TRIGTIME]
Total Fluence
Measured from: -191.255899965763
to: 960.744100034237 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 85.437997 64.020352 11.663542 0.008279
0.229497 0.224818 0.176009 0.151837 [error]
Peak 0.040421 0.022622 0.002313 -0.003876
0.006144 0.006149 0.005111 0.004335 [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 3.92e-05 2.42e-05 9.60e-06 5.13e-06 7.56e-05 7.81e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.05e-01 1.64e-01 3.88e-02 1.12e-02 6.14e-01 6.19e-01 ph/cm2/s
Error 9.58e-02 5.68e-02 2.86e-02 1.64e-02 1.41e-01 1.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.74e-05 2.67e-05 8.88e-06 7.69e-07 6.37e-05 6.38e-05 erg/cm2
Error 1.48e-06 5.12e-07 2.72e-07 1.35e-07 1.78e-06 1.79e-06 erg/cm2
Peak flux Cutoff-PL 4.08e-01 1.68e-01 3.05e-02 3.28e-03 6.08e-01 6.10e-01 ph/cm2/s
Error 9.93e-02 6.64e-02 3.57e-02 1.60e-02 1.41e-01 1.45e-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 3.334 0.000 - - 4.61e-03 0.00e+00 417.080 57
CPL 1.000 0.000 50.0 0.0 1.14e-02 0.00e+00 3007.090 56
The chi2 of BB fit is 388.75 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 3.077 0.666 - - 2.11e-03 1.21e-03 61.060 57
CPL 1.000 0.000 50.0 0.0 1.18e-02 0.00e+00 77.810 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: 511.680000 sec.
T50 in the 50-300 keV band: 326.464000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1152.000 -191.256 960.744
T90 928.000 -15.256 912.744
T50 416.000 368.744 784.744
Peak 1.000 616.244 617.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.8698 +61.4268 0.0478 15.8 15.8 1.5551 4.0 TRIG_00782859
------------------------------------------
Foreground time interval of the image:
-191.256 -56.636 (delta_t = 134.620 [sec])
-55.256 16.045 (delta_t = 71.301 [sec])
Background time interval of the image:
-239.256 -191.256 (delta_t = 48.000 [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
Multiple GTIs in the spectrum
tstart tstop
-191.255900 -56.636000
-55.256000 34.594000
35.744000 238.874000
239.744000 960.744100
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.33374 ( )
Norm@50keV : 4.61274E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 417.08 using 59 PHA bins.
# Reduced chi-squared = 7.3173 for 57 degrees of freedom
# Null hypothesis probability = 3.247546e-56
Photon flux (15-150 keV) in 1149 sec: 1.63358 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56099e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-191.255900 -56.636000
-55.256000 34.594000
35.744000 238.874000
239.744000 960.744100
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.14474E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 3007.09 using 59 PHA bins.
# Reduced chi-squared = 53.6981 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 1149 sec: 1.29436 ( -0.0476 0.04836 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36921e-05 ( -1.77015e-06 1.78922e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-191.255900 -56.636000
-55.256000 34.594000
35.744000 238.874000
239.744000 960.744100
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24596 ( -0.255018 0.305608 )
beta : -5.42441 ( 5.50817 0.959547 )
Epeak [keV] : 15.5553 ( -3.77279 3.06574 )
Norm@50keV : 6.12356E-02 ( -0.0160206 0.03024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.23 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.845108e-01
Photon flux (15-150 keV) in 1149 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] : 8.11727 ( )
R^2/D10^2 : 1.09978 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 388.75 using 59 PHA bins.
# Reduced chi-squared = 6.8201 for 57 degrees of freedom
# Null hypothesis probability = 6.749359e-51
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.522e-05 5.285e-07
25- 50 2.731e-05 5.228e-07
50-150 7.521e-06 2.453e-07
15-150 5.005e-05 9.996e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.5213 (-0.524802 0.543506)
Norm : 14.2306 (-0.643392 0.670708)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.48 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.315871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.786e-05 8.445e-07
25- 50 2.662e-05 4.653e-07
50-150 9.665e-06 3.005e-07
15-150 6.415e-05 1.258e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.24422 (-0.358615 0.358145)
R1^2/D10^2 : 6.13691 (-1.44733 2.14147)
kT2 [keV] : 11.3191 (-0.631358 0.775438)
R2^2/D10^2 : 0.130406 (-0.0451503 0.0584052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.65 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.795353e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.471e-05 1.580e-06
25- 50 2.698e-05 1.126e-06
50-150 9.514e-06 6.153e-07
15-150 6.120e-05 3.137e-06
Peak spectrum fit
Power-law model
Time interval is from 616.244 sec. to 617.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.07721 ( -0.573374 0.75828 )
Norm@50keV : 2.11125E-03 ( -0.00111406 0.00130451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.06 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.321688e-01
Photon flux (15-150 keV) in 1 sec: 0.614477 ( -0.140225 0.140996 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.631e-08 ( -7.85249e-09 8.95337e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 616.244 sec. to 617.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.18122E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.81 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 56 degrees of freedom
# Null hypothesis probability = 2.854200e-02
Photon flux (15-150 keV) in 1 sec: 0.608367 ( -0.13976 0.141514 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4797e-08 ( -8.0335e-09 1.02046e-08 ) ergs/cm2
Band function
Time interval is from 616.244 sec. to 617.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.152866 ( 1.49255 1.49255 )
beta : -3.54042 ( 3.35772 0.814614 )
Epeak [keV] : 15.1369 ( -8.07288 70.184 )
Norm@50keV : 0.772116 ( -0.772132 5892.29 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.816673e-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] : 4.61764 (-1.04071 1.36468)
R^2/D10^2 : 7.46611 (-7.46799 18.9209)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.886109e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.306e-08 7.495e-09
25- 50 6.974e-09 4.106e-09
50-150 1.900e-10 1.740e-10
15-150 2.023e-08 1.215e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6822 (-6.45898 12.0042)
Norm : 10.1916 (-5.0031 12.7152)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.270143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.246e-08 4.911e-09
25- 50 8.864e-09 4.211e-09
50-150 1.707e-09 1.518e-09
15-150 2.303e-08 1.048e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.85615 (-3.86233 1.55863)
R1^2/D10^2 : 15.2729 (-15.2288 -15.2288)
kT2 [keV] : 12.9214 (-12.9866 -12.9866)
R2^2/D10^2 : 3.53702E-02 (-0.0348167 0.163194)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Null hypothesis probability = 2.926060e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.285e-08 7.535e-09
25- 50 8.054e-09 4.293e-09
50-150 4.544e-09 3.212e-09
15-150 2.545e-08 1.243e-08
Plot creation:
Fri Oct 27 12:35:12 EDT 2017