batgrbproduct analysis for trigger=781740
batgrbproduct Analysis for Trigger=781740
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): Tue Oct 24 11:12:41 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger781740/GCN5_download_cron
======================================================================
Trigger: 00781740 Segment: 000
BAT Trigger Time: 530440458.56 [s; MET]
Trigger Stop: 530440459.584 [s; MET]
UTC: 2017-10-23T08:33:58.675420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.6330848310285 Dec: 41.1650551179965 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.93
Image Trigger?: NO
Rate S/N Ratio: 26.5706605111728 [ if not an image trigger ]
Image S/N Ratio: 5.93
Flight Position: [ source = BAT ]
RA: 10.6330848310285 Dec: 41.1650551179965 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 10.6593153962933 Dec: 41.1434831765995 [deg; J2000]
{ 00h 42m 38.2s , +41d 08' 36.5" }
+/- 3.0739140686614 [arcmin] (estimated 90% radius based on SNR)
+/- 1.42961372425083 [arcmin] (formal 1-sigma fit error)
SNR: 6.11527397692301
Angular difference between Flight and Ground position is 1.754847 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 0.915999948978424 +/- 0.260376657598808
Measured from: 0.0160000920295715
to: 0.932000041007996 [s; relative to TRIGTIME]
T50: 0.539999961853027 +/- 0.277243547135739
Measured from: 0.232000112533569
to: 0.772000074386597 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0300000309944153
to: 0.969999969005585 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 0.995999991893768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034136 0.053683 0.004685 0.010349
0.009490 0.009635 0.006731 0.005445 [error]
Peak 0.031647 0.050196 0.005794 0.011071
0.009380 0.009517 0.006674 0.005393 [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 1.41e-08 1.23e-08 1.84e-08 4.44e-08 5.64e-08 erg/cm2
Error 3.90e-09 4.00e-09 5.78e-09 1.65e-08 1.44e-08 2.46e-08 erg/cm2
Peak flux Power-law 3.51e-01 2.46e-01 1.13e-01 7.30e-02 7.45e-01 7.83e-01 ph/cm2/s
Error 1.28e-01 7.03e-02 5.18e-02 6.17e-02 2.11e-01 2.23e-01 ph/cm2/s
Fluence Cutoff-PL 9.34e-09 2.25e-08 5.72e-09 3.80e-11 3.76e-08 3.76e-08 erg/cm2
Error 7.10e-09 7.04e-09 6.75e-09 1.12e-09 1.09e-08 1.09e-08 erg/cm2
Peak flux Cutoff-PL 2.78e-01 3.74e-01 6.25e-02 3.74e-04 7.15e-01 7.15e-01 ph/cm2/s
Error 2.17e-01 1.26e-01 6.98e-02 1.33e-02 2.12e-01 2.12e-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 2.193 0.472 - - 4.64e-03 1.67e-03 62.950 57
CPL -3.290 0.354 34.2 7.0 1.31e+01 1.57e+05 56.490 56
The chi2 of BB fit is 56.77 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 2.118 0.491 - - 4.70e-03 1.69e-03 64.630 57
CPL -2.849 0.698 34.5 8.3 6.36e+00 1.08e+05 60.430 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 1.020 -0.024 0.996
T90 0.916 0.016 0.932
T50 0.540 0.232 0.772
Peak 1.000 -0.030 0.970
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
10.6593 +41.1435 0.0313 23.2 110.0 0.0997 6.1 TRIG_00781740
------------------------------------------
Foreground time interval of the image:
-0.024 0.996 (delta_t = 1.020 [sec])
Background time interval of the image:
-128.459 -0.024 (delta_t = 128.435 [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 -0.024 sec. to 0.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19350 ( -0.436969 0.50628 )
Norm@50keV : 4.63833E-03 ( -0.00169476 0.00165232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.95 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.739396e-01
Photon flux (15-150 keV) in 1.02 sec: 0.765280 ( -0.2094 0.209401 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44349e-08 ( -1.40244e-08 1.46805e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.29044 ( 2.48868 3.196 )
Epeak [keV] : 34.1918 ( -6.80157 7.15223 )
Norm@50keV : 13.1253 ( -12.6002 313294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.564425e-01
Photon flux (15-150 keV) in 1.02 sec: 0.743817 ( -0.210046 0.208251 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76219e-08 ( -1.04806e-08 1.13868e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.51390 ( -5.18378 -4.5139 )
beta : -4.89608 ( 4.89608 2.06645 )
Epeak [keV] : 33.8101 ( -5.39441 5.70462 )
Norm@50keV : 79.9776 ( -20.1731 602.865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.165022e-01
Photon flux (15-150 keV) in 1.02 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] : 8.74622 (-1.66207 2.01244)
R^2/D10^2 : 0.693454 (-0.401085 0.895457)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 0.9959 for 57 degrees of freedom
# Null hypothesis probability = 4.837441e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-08 4.979e-09
25- 50 2.107e-08 9.551e-09
50-150 7.358e-09 4.735e-09
15-150 3.880e-08 1.777e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.2059 (-17.5407 42.4701)
Norm : 5.02735 (-1.87075 2.8393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.51 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.502003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-08 4.952e-09
25- 50 1.612e-08 6.918e-09
50-150 1.322e-08 9.997e-09
15-150 4.132e-08 1.745e-08
Double BB
#Fit statistic : Chi-Squared = 56.73 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.27 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.089468e-01
# Null hypothesis probability = 4.096536e-01
# Null hypothesis probability = 4.104672e-01
# Null hypothesis probability = 4.263768e-01
# Null hypothesis probability = 4.272285e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.030 sec. to 0.970 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11796 ( -0.457281 0.524301 )
Norm@50keV : 4.69612E-03 ( -0.00172517 0.00166454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.63 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.276755e-01
Photon flux (15-150 keV) in 1 sec: 0.745433 ( -0.21095 0.210984 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37158e-08 ( -1.41773e-08 1.47845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.030 sec. to 0.970 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.84855 ( 1.96169 3.35762 )
Epeak [keV] : 34.4628 ( -6.90025 9.70268 )
Norm@50keV : 6.35537 ( -5.88218 215026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.187987e-01
Photon flux (15-150 keV) in 1 sec: 0.714728 ( -0.212748 0.21065 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56825e-08 ( -1.07253e-08 7.0504e-09 ) ergs/cm2
Band function
Time interval is from -0.030 sec. to 0.970 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.88369 ( -5.60635 -4.40437 )
beta : -4.22606 ( 4.25402 1.79967 )
Epeak [keV] : 33.5533 ( -5.83094 7.73277 )
Norm@50keV : 31.9471 ( -31.8824 54.7787 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.16 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.943188e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80684e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.87732 (-1.82331 2.28258)
R^2/D10^2 : 0.624416 (-0.382507 0.911353)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.53 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.495578e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.511e-09 5.176e-09
25- 50 1.978e-08 1.010e-08
50-150 7.236e-09 5.040e-09
15-150 3.653e-08 2.013e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.8988 (-21.1822 61.707)
Norm : 4.55416 (-1.76291 2.74753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.707745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.096e-08 4.711e-09
25- 50 1.538e-08 7.526e-09
50-150 1.404e-08 1.017e-08
15-150 4.038e-08 2.086e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.28 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.26 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 2.829916e-01
# Null hypothesis probability = 2.841177e-01
# Null hypothesis probability = 3.221889e-01
# Null hypothesis probability = 3.230234e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Tue Oct 24 11:18:13 EDT 2017