batgrbproduct analysis for trigger=738728
batgrbproduct Analysis for Trigger=738728
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 Feb 17 16:56:39 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger738728/GCN5_download_cron
======================================================================
Trigger: 00738728 Segment: 000
BAT Trigger Time: 508965736 [s; MET]
Trigger Stop: 508965800 [s; MET]
UTC: 2017-02-16T19:21:57.375500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 181.473749705816 Dec: 47.6499008227623 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.86
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.86
Flight Position: [ source = BAT ]
RA: 181.473749705816 Dec: 47.6499008227623 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 181.480149938772 Dec: 47.6648121203206 [deg; J2000]
{ 12h 05m 55.2s , +47d 39' 53.3" }
+/- 3.39671887472506 [arcmin] (estimated 90% radius based on SNR)
+/- 1.73905235447166 [arcmin] (formal 1-sigma fit error)
SNR: 5.30226955065823
Angular difference between Flight and Ground position is 0.931317 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.193653 0.167379 0.024417 0.046742
0.045322 0.046712 0.040391 0.034933 [error]
Peak 0.193653 0.167379 0.024417 0.046742
0.045322 0.046712 0.040391 0.034933 [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 5.19e-08 5.68e-08 4.44e-08 5.72e-08 1.74e-07 2.13e-07 erg/cm2
Error 1.89e-08 2.09e-08 2.83e-08 7.64e-08 7.21e-08 1.15e-07 erg/cm2
Peak flux Power-law 2.66e-02 1.63e-02 6.37e-03 3.35e-03 5.09e-02 5.25e-02 ph/cm2/s
Error 9.83e-03 5.82e-03 3.92e-03 4.18e-03 1.67e-02 1.77e-02 ph/cm2/s
Fluence Cutoff-PL 5.03e-08 8.48e-08 7.24e-09 2.68e-12 1.42e-07 1.42e-07 erg/cm2
Error 2.28e-08 3.34e-08 2.06e-08 1.86e-09 4.84e-08 4.84e-08 erg/cm2
Peak flux Cutoff-PL 2.45e-02 2.51e-02 1.25e-03 2.49e-07 5.08e-02 5.08e-02 ph/cm2/s
Error 1.17e-02 9.26e-03 3.17e-03 1.56e-04 1.55e-02 1.54e-02 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 2.366 0.588 - - 2.80e-04 1.38e-04 61.610 57
CPL -4.961 0.280 28.9 6.3 2.97e+01 6.48e+04 54.570 56
The chi2 of BB fit is 55.32 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 2.366 0.588 - - 2.80e-04 1.38e-04 61.610 57
CPL -4.961 0.280 28.9 6.3 2.97e+01 6.47e+04 54.570 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
181.4801 +47.6648 0.0363 22.9 -174.6 0.4864 5.3 TRIG_00738728
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36598 ( -0.515938 0.661046 )
Norm@50keV : 2.80240E-04 ( -0.000133449 0.000142519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.61 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.146751e-01
Photon flux (15-150 keV) in 64 sec: 5.09135E-02 ( -0.0166511 0.0168414 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74402e-07 ( -6.83232e-08 7.5913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96063 ( 3.55054 4.11132 )
Epeak [keV] : 28.9033 ( -5.77232 6.8987 )
Norm@50keV : 29.7384 ( -29.1981 129482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.292147e-01
Photon flux (15-150 keV) in 64 sec: 5.08278E-02 ( -0.0154101 0.0156262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42392e-07 ( -4.50336e-08 5.18253e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.66096 ( -5.16144 -4.66096 )
beta : -9.25740 ( 9.2574 19.2019 )
Epeak [keV] : 29.3587 ( -5.55066 5.4787 )
Norm@50keV : 16.7268 ( -4.83023 172.436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 55 degrees of freedom
# Null hypothesis probability = 4.908833e-01
Photon flux (15-150 keV) in 64 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] : 7.39487 (-1.67209 2.17075)
R^2/D10^2 : 8.97115E-02 (-0.0897079 0.161662)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9706 for 57 degrees of freedom
# Null hypothesis probability = 5.381692e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.321e-08 3.169e-08
25- 50 8.086e-08 4.918e-08
50-150 1.628e-08 1.394e-08
15-150 1.503e-07 9.197e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.9140 (-14.9091 36.7383)
Norm : 0.401329 (-0.174068 0.314763)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.134969e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.465e-08 2.935e-08
25- 50 6.560e-08 4.073e-08
50-150 4.043e-08 3.352e-08
15-150 1.607e-07 9.377e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.26422 (-7.3023 -7.3023)
R1^2/D10^2 : 6.43966E-02 (-0.0638869 -0.0638869)
kT2 [keV] : 7.59130 (-7.4695 -7.4695)
R2^2/D10^2 : 2.68371E-02 (-0.026376 -0.026376)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.33 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.622275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.342e-08 1.295e-02
25- 50 8.065e-08 1.237e-01
50-150 1.611e-08 3.003e+00
15-150 1.502e-07 2.834e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36598 ( -0.515938 0.661046 )
Norm@50keV : 2.80240E-04 ( -0.000133449 0.000142519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.61 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.146751e-01
Photon flux (15-150 keV) in 64 sec: 5.09135E-02 ( -0.0166511 0.0168414 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74402e-07 ( -6.83232e-08 7.5913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96063 ( 3.55054 4.11132 )
Epeak [keV] : 28.9033 ( -5.77232 6.8987 )
Norm@50keV : 29.7384 ( -29.1981 129450 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.292147e-01
Photon flux (15-150 keV) in 64 sec: 5.08278E-02 ( -0.0154101 0.0156262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42392e-07 ( -4.50336e-08 5.18253e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.66096 ( -5.16144 -4.66096 )
beta : -9.25740 ( 9.2574 19.2019 )
Epeak [keV] : 29.3587 ( -5.55066 5.4787 )
Norm@50keV : 16.7268 ( -4.83023 172.436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 55 degrees of freedom
# Null hypothesis probability = 4.908833e-01
Photon flux (15-150 keV) in 64 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] : 7.39487 (-1.67209 2.17075)
R^2/D10^2 : 8.97115E-02 (-0.0897079 0.161662)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9706 for 57 degrees of freedom
# Null hypothesis probability = 5.381692e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.321e-08 3.200e-08
25- 50 8.086e-08 5.120e-08
50-150 1.628e-08 1.326e-08
15-150 1.503e-07 9.187e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.9140 (-14.9091 36.7383)
Norm : 0.401329 (-0.174068 0.314763)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.134969e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.465e-08 3.080e-08
25- 50 6.560e-08 3.728e-08
50-150 4.043e-08 3.560e-08
15-150 1.607e-07 1.049e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.26422 (-7.3023 -7.3023)
R1^2/D10^2 : 6.43966E-02 (-0.0638869 -0.0638869)
kT2 [keV] : 7.59130 (-7.4695 -7.4695)
R2^2/D10^2 : 2.68371E-02 (-0.026376 -0.026376)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.33 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.622275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.342e-08 1.292e-02
25- 50 8.065e-08 1.055e-01
50-150 1.611e-08 2.798e+00
15-150 1.502e-07 3.040e+00
Plot creation:
Fri Feb 17 17:17:50 EST 2017