batgrbproduct analysis for trigger=797070
batgrbproduct Analysis for Trigger=797070
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 Dec 15 09:23:19 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger797070/GCN5_download_cron
======================================================================
Trigger: 00797070 Segment: 000
BAT Trigger Time: 534917749.312 [s; MET]
Trigger Stop: 534917751.36 [s; MET]
UTC: 2017-12-14T04:15:29.159520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.1958194987679 Dec: 15.3172018899938 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.78
Image Trigger?: NO
Rate S/N Ratio: 7.34846922834953 [ if not an image trigger ]
Image S/N Ratio: 6.78
Flight Position: [ source = BAT ]
RA: 41.1958194987679 Dec: 15.3172018899938 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.1876239085155 Dec: 15.3391554113705 [deg; J2000]
{ 02h 44m 45.0s , +15d 20' 21.0" }
+/- 3.60968507472348 [arcmin] (estimated 90% radius based on SNR)
+/- 1.97835478498014 [arcmin] (formal 1-sigma fit error)
SNR: 4.86108982354677
Angular difference between Flight and Ground position is 1.399983 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 2.04800003767014 +/-
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
T50: 2.04800003767014 +/-
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800003767014 second)
Measured from: -2.98023223876953e-08
to: 2.04800000786781 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034713 0.051387 -0.013500 0.006235
0.010402 0.010572 0.008200 0.007090 [error]
Peak 0.034713 0.051387 -0.013500 0.006235
0.010402 0.010572 0.008200 0.007090 [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 1.08e-08 1.08e-08 7.55e-09 8.34e-09 3.24e-08 3.76e-08 erg/cm2
Error 4.13e-09 4.27e-09 5.07e-09 1.12e-08 1.40e-08 1.99e-08 erg/cm2
Peak flux Power-law 1.74e-01 9.68e-02 3.39e-02 1.55e-02 3.13e-01 3.20e-01 ph/cm2/s
Error 6.67e-02 3.81e-02 2.21e-02 1.95e-02 1.14e-01 1.18e-01 ph/cm2/s
Fluence Cutoff-PL 9.85e-09 2.21e-08 2.59e-09 1.46e-12 3.46e-08 3.46e-08 erg/cm2
Error 4.76e-09 7.39e-09 4.06e-09 9.53e-11 1.08e-08 1.08e-08 erg/cm2
Peak flux Cutoff-PL 1.48e-01 2.01e-01 1.38e-02 4.06e-06 3.63e-01 3.62e-01 ph/cm2/s
Error 7.49e-02 6.34e-02 2.03e-02 2.61e-04 1.06e-01 1.06e-01 ph/cm2/s
Fluence Band 9.72e-09 2.19e-08 3.82e-09 2.45e-11 3.56e-08 3.56e-08 erg/cm2
Error 4.38e-09 7.07e-09 -------- 8.43e-10 -------- 1.05e-08 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 2.511 0.588 - - 1.58e-03 8.37e-04 91.350 57
CPL -5.409 -0.514 31.4 3.9 2.47e+02 3.01e+05 77.120 56
The chi2 of BB fit is 78.99 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 2.511 0.588 - - 1.58e-03 8.37e-04 91.350 57
CPL -5.409 -0.514 31.4 3.9 2.47e+02 3.01e+05 77.120 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
41.1876 +15.3392 0.0398 18.8 -171.6 0.0877 4.9 TRIG_00797070
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-239.312 -13.312 (delta_t = 226.000 [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: 2.51126 ( -0.51727 0.65923 )
Norm@50keV : 1.58131E-03 ( -0.000804861 0.000869874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.35 using 59 PHA bins.
# Reduced chi-squared = 1.603 for 57 degrees of freedom
# Null hypothesis probability = 2.615326e-03
Photon flux (15-150 keV) in 2.048 sec: 0.312945 ( -0.113775 0.113773 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24336e-08 ( -1.32417e-08 1.48125e-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: -5.40866 ( 6.309 5.28132 )
Epeak [keV] : 31.3600 ( -4.70216 3.18707 )
Norm@50keV : 247.365 ( -242.413 601259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.12 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 56 degrees of freedom
# Null hypothesis probability = 3.216055e-02
Photon flux (15-150 keV) in 2.048 sec: 0.362732 ( -0.105548 0.107241 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45711e-08 ( -1.06078e-08 1.09457e-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 : 4.83598 ( -3.77481 -4.83598 )
beta : -9.98394 ( 9.98394 19.9452 )
Epeak [keV] : 31.6844 ( -5.22453 5.50011 )
Norm@50keV : 97.5244 ( -27.1118 321.639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.17 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 55 degrees of freedom
# Null hypothesis probability = 2.596256e-02
Photon flux (15-150 keV) in 2.048 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56483e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.94812 (-1.53924 1.79064)
R^2/D10^2 : 0.485323 (-0.282709 0.659779)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.99 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 57 degrees of freedom
# Null hypothesis probability = 2.855482e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.130e-08 6.844e-09
25- 50 1.955e-08 1.211e-08
50-150 5.025e-09 3.779e-09
15-150 3.588e-08 2.177e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.5418 (-11.508 22.1018)
Norm : 2.89638 (-1.23161 1.93804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.13 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 57 degrees of freedom
# Null hypothesis probability = 7.617557e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-08 6.722e-09
25- 50 1.357e-08 8.512e-09
50-150 7.282e-09 6.497e-09
15-150 3.283e-08 2.109e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.94350 (-7.94107 -7.94107)
R1^2/D10^2 : 0.145006 (-0.145799 -0.145799)
kT2 [keV] : 7.95151 (-7.94207 -7.94207)
R2^2/D10^2 : 0.339999 (-0.340968 -0.340968)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.99 using 59 PHA bins.
# Reduced chi-squared = 1.436 for 55 degrees of freedom
# Null hypothesis probability = 1.869339e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.130e-08 4.425e-01
25- 50 1.955e-08 3.280e+00
50-150 5.027e-09 8.442e+01
15-150 3.587e-08 7.994e+01
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: 2.51126 ( -0.51727 0.65923 )
Norm@50keV : 1.58131E-03 ( -0.000804861 0.000869874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.35 using 59 PHA bins.
# Reduced chi-squared = 1.603 for 57 degrees of freedom
# Null hypothesis probability = 2.615326e-03
Photon flux (15-150 keV) in 2.048 sec: 0.312945 ( -0.113775 0.113773 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24336e-08 ( -1.32417e-08 1.48125e-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: -5.40866 ( 6.309 5.28132 )
Epeak [keV] : 31.3600 ( -4.70216 3.18707 )
Norm@50keV : 247.365 ( -242.413 601259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.12 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 56 degrees of freedom
# Null hypothesis probability = 3.216055e-02
Photon flux (15-150 keV) in 2.048 sec: 0.362732 ( -0.105548 0.107241 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45711e-08 ( -1.06078e-08 1.09457e-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 : 4.83598 ( -3.77481 -4.83598 )
beta : -9.98394 ( 9.98394 19.9452 )
Epeak [keV] : 31.6844 ( -5.22453 5.50011 )
Norm@50keV : 97.5244 ( -27.1118 321.639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.17 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 55 degrees of freedom
# Null hypothesis probability = 2.596256e-02
Photon flux (15-150 keV) in 2.048 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56483e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.94812 (-1.53924 1.79064)
R^2/D10^2 : 0.485323 (-0.282709 0.659779)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.99 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 57 degrees of freedom
# Null hypothesis probability = 2.855482e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.130e-08 6.390e-09
25- 50 1.955e-08 1.255e-08
50-150 5.025e-09 3.858e-09
15-150 3.588e-08 2.115e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.5418 (-11.508 22.1018)
Norm : 2.89638 (-1.23161 1.93804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.13 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 57 degrees of freedom
# Null hypothesis probability = 7.617557e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-08 7.188e-09
25- 50 1.357e-08 8.156e-09
50-150 7.282e-09 5.885e-09
15-150 3.283e-08 1.908e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.94350 (-7.94107 -7.94107)
R1^2/D10^2 : 0.145006 (-0.145799 -0.145799)
kT2 [keV] : 7.95151 (-7.94207 -7.94207)
R2^2/D10^2 : 0.339999 (-0.340968 -0.340968)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.99 using 59 PHA bins.
# Reduced chi-squared = 1.436 for 55 degrees of freedom
# Null hypothesis probability = 1.869339e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.130e-08 3.795e-01
25- 50 1.955e-08 3.506e+00
50-150 5.027e-09 7.738e+01
15-150 3.587e-08 8.170e+01
Plot creation:
Fri Dec 15 09:30:02 EST 2017