batgrbproduct analysis for trigger=779762
batgrbproduct Analysis for Trigger=779762
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): Wed Oct 18 18:20:32 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger779762/GCN5_download_cron
======================================================================
Trigger: 00779762 Segment: 000
BAT Trigger Time: 529954709.696 [s; MET]
Trigger Stop: 529954736.576 [s; MET]
UTC: 2017-10-17T17:38:09.840380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.514684939926 Dec: -40.5544553462289 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 25.6
Image Trigger?: NO
Rate S/N Ratio: 96.0104161015877 [ if not an image trigger ]
Image S/N Ratio: 25.6
Flight Position: [ source = BAT ]
RA: 135.514684939926 Dec: -40.5544553462289 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.519752582203 Dec: -40.5670473238234 [deg; J2000]
{ 09h 02m 04.7s , -40d 34' 01.4" }
+/- 1.11074178831522 [arcmin] (estimated 90% radius based on SNR)
+/- 0.362705320170178 [arcmin] (formal 1-sigma fit error)
SNR: 26.1792254128466
Angular difference between Flight and Ground position is 0.790043 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 833.73199993372 +/- 104.964545823839
Measured from: -127.903999865055
to: 705.828000068665 [s; relative to TRIGTIME]
T50: 263.011999964714 +/- 6.81013738058302
Measured from: 2.51200014352798
to: 265.524000108242 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.14000004529953
to: 6.14000004529953 [s; relative to TRIGTIME]
Total Fluence
Measured from: -209.77999997139
to: 873.304000020027 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 40.312089 24.417580 0.826001 -0.009549
0.200580 0.195753 0.159377 0.141351 [error]
Peak 0.183587 0.130931 0.008461 0.003588
0.008334 0.007732 0.005068 0.004277 [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 1.85e-05 7.97e-06 2.05e-06 6.48e-07 2.89e-05 2.92e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 2.02e+00 7.86e-01 1.77e-01 4.82e-02 3.02e+00 3.04e+00 ph/cm2/s
Error 1.83e-01 6.87e-02 3.14e-02 1.47e-02 2.29e-01 2.30e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-05 1.01e-05 4.61e-07 1.20e-10 2.27e-05 2.27e-05 erg/cm2
Error 8.85e-07 2.57e-07 7.26e-08 1.09e-10 9.43e-07 9.43e-07 erg/cm2
Peak flux Cutoff-PL 1.78e+00 1.01e+00 4.57e-02 3.22e-05 2.84e+00 2.84e+00 ph/cm2/s
Error 2.17e-01 9.85e-02 2.51e-02 1.44e-04 2.36e-01 2.36e-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 3.961 0.000 - - 1.25e-03 0.00e+00 585.850 57
CPL 1.000 0.000 50.0 0.0 3.74e-03 0.00e+00 2847.890 56
The chi2 of BB fit is 58.79 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 3.147 0.167 - - 9.84e-03 1.36e-03 103.620 57
CPL 1.000 0.000 50.0 0.0 4.11e-02 0.00e+00 277.170 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 1083.080 -209.780 873.304
T90 833.732 -127.904 705.828
T50 263.012 2.512 265.524
Peak 1.000 5.140 6.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.5198 -40.5670 0.0074 17.6 46.1 17.8781 26.2 TRIG_00779762
------------------------------------------
Foreground time interval of the image:
-209.780 -64.636 (delta_t = 145.144 [sec])
-63.696 90.805 (delta_t = 154.501 [sec])
Background time interval of the image:
-235.395 -209.780 (delta_t = 25.615 [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
-209.780000 -64.636000
-63.696000 873.304000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.96053 ( )
Norm@50keV : 1.24747E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 585.85 using 59 PHA bins.
# Reduced chi-squared = 10.278 for 57 degrees of freedom
# Null hypothesis probability = 8.026797e-89
Photon flux (15-150 keV) in 1082 sec: 0.743324 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88962e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-209.780000 -64.636000
-63.696000 873.304000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.73793E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 2847.89 using 59 PHA bins.
# Reduced chi-squared = 50.8551 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 1082 sec: 0.548414 ( -0.028499 0.02895 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26681e-05 ( -9.37769e-07 9.4794e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-209.780000 -64.636000
-63.696000 873.304000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54067 ( )
beta : -8.27143 ( )
Epeak [keV] : 5.93272 ( )
Norm@50keV : 5.26194E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 208.90 using 59 PHA bins.
# Reduced chi-squared = 3.7981 for 55 degrees of freedom
# Null hypothesis probability = 8.817718e-20
Photon flux (15-150 keV) in 1082 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] : 5.32572 (-0.0898562 0.0919476)
R^2/D10^2 : 3.88932 (-0.385704 0.42565)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.79 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.098684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.309e-05 5.626e-07
25- 50 9.955e-06 2.613e-07
50-150 5.445e-07 4.734e-08
15-150 2.359e-05 6.763e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2584 ( )
Norm : 16.5341 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 194.23 using 59 PHA bins.
# Reduced chi-squared = 3.4076 for 57 degrees of freedom
# Null hypothesis probability = 7.194649e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.661e-05 6.600e-07
25- 50 9.206e-06 2.240e-07
50-150 1.055e-06 8.099e-08
15-150 2.687e-05 7.628e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.918 (-199.918 -199.918)
R1^2/D10^2 : 4.86800E-07 (-4.868e-07 -4.868e-07)
kT2 [keV] : 5.31921 (-0.0913136 0.0938492)
R2^2/D10^2 : 3.91374 (-0.386929 0.373393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.79 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 55 degrees of freedom
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.386021e-01
# Null hypothesis probability = 3.496029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.309e-05 2.280e+02
25- 50 9.955e-06 1.784e+03
50-150 5.444e-07 4.682e+04
15-150 2.359e-05 4.886e+04
Peak spectrum fit
Power-law model
Time interval is from 5.140 sec. to 6.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.14736 ( -0.162799 0.172105 )
Norm@50keV : 9.83976E-03 ( -0.0013463 0.00137477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.62 using 59 PHA bins.
# Reduced chi-squared = 1.8179 for 57 degrees of freedom
# Null hypothesis probability = 1.578683e-04
Photon flux (15-150 keV) in 1 sec: 3.01820 ( -0.229104 0.229238 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26984e-07 ( -1.02958e-08 1.0396e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.140 sec. to 6.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.10934E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 277.17 using 59 PHA bins.
# Reduced chi-squared = 4.9495 for 56 degrees of freedom
# Null hypothesis probability = 4.964093e-31
Photon flux (15-150 keV) in 1 sec: 2.83669 ( -0.23668 0.23575 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11651e-07 ( -8.897e-09 9.019e-09 ) ergs/cm2
Band function
Time interval is from 5.140 sec. to 6.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.78257 ( -0.794239 2.68932 )
beta : -6.93169 ( 9.98738 0.0227442 )
Epeak [keV] : 22.7827 ( -1.37572 1.43104 )
Norm@50keV : 25.2640 ( -15.1138 525.757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.416928e-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] : 5.82694 (-0.351403 0.36686)
R^2/D10^2 : 12.8709 (-3.25428 4.44611)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.153982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.561e-08 6.370e-09
25- 50 5.199e-08 5.425e-09
50-150 4.217e-09 1.352e-09
15-150 1.118e-07 9.400e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2974 (-1.97444 2.28897)
Norm : 44.7163 (-7.63166 9.38425)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.19 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 57 degrees of freedom
# Null hypothesis probability = 7.296046e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.065e-08 5.875e-09
25- 50 4.716e-08 4.885e-09
50-150 1.094e-08 3.500e-09
15-150 1.188e-07 1.015e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.437850e-01
# Null hypothesis probability = 3.450440e-01
# Null hypothesis probability = 3.471835e-01
# Null hypothesis probability = 3.529044e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.561e-08 2.568e+00
25- 50 5.200e-08 2.518e+01
50-150 4.218e-09 5.365e+02
15-150 1.118e-07 5.695e+02
Plot creation:
Wed Oct 18 18:25:35 EDT 2017