batgrbproduct analysis for trigger=817345
batgrbproduct Analysis for Trigger=817345
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): Sat Mar 24 11:18:17 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger817345/batgroup_hand_proc
======================================================================
Trigger: 00817345 Segment: 000
BAT Trigger Time: 543559050.304 [s; MET]
Trigger Stop: 543559050.816 [s; MET]
UTC: 2018-03-24T04:37:09.631100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.5845390141635 Dec: 56.7246966581087 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.63
Image Trigger?: NO
Rate S/N Ratio: 73.9864852523757 [ if not an image trigger ]
Image S/N Ratio: 18.63
Flight Position: [ source = BAT ]
RA: 76.5845390141635 Dec: 56.7246966581087 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.5810188019364 Dec: 56.7435464022776 [deg; J2000]
{ 05h 06m 19.4s , +56d 44' 36.8" }
+/- 1.37917894234048 [arcmin] (estimated 90% radius based on SNR)
+/- 0.533598528397135 [arcmin] (formal 1-sigma fit error)
SNR: 19.2158834006703
Angular difference between Flight and Ground position is 1.136903 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 7.21599996089935 +/- 1.30228724554167
Measured from: -4.7720000743866
to: 2.44399988651276 [s; relative to TRIGTIME]
T50: 0.543999910354614 +/- 0.199719810945016
Measured from: 0.0199999809265137
to: 0.563999891281128 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.128000020980835
to: 0.871999979019165 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.36000001430511
to: 3.6599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.256556 0.332722 0.256455 0.070931
0.022602 0.023943 0.021125 0.017669 [error]
Peak 0.128798 0.185553 0.206617 0.050883
0.009892 0.011137 0.010747 0.007490 [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 7.20e-08 1.36e-07 1.99e-07 6.20e-07 5.64e-07 1.03e-06 erg/cm2
Error 9.97e-09 1.11e-08 2.09e-08 1.44e-07 5.02e-08 1.59e-07 erg/cm2
Peak flux Power-law 1.12e+00 1.37e+00 1.22e+00 1.88e+00 4.36e+00 5.60e+00 ph/cm2/s
Error 1.29e-01 9.57e-02 8.36e-02 2.76e-01 2.64e-01 3.55e-01 ph/cm2/s
Fluence Cutoff-PL 7.21e-08 1.36e-07 1.99e-07 6.14e-07 5.64e-07 1.02e-06 erg/cm2
Error 7.68e-09 1.14e-08 2.11e-08 1.88e-07 5.04e-08 2.06e-07 erg/cm2
Peak flux Cutoff-PL 1.03e+00 1.40e+00 1.27e+00 1.38e+00 4.31e+00 5.08e+00 ph/cm2/s
Error 1.25e-01 1.04e-01 1.04e-01 -------- 2.75e-01 6.34e-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 1.453 0.144 - - 6.54e-03 5.18e-04 63.970 57
CPL 1.451 0.291 10000.0 0.0 6.56e-03 0.00e+00 63.980 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.165 0.104 - - 3.74e-02 2.20e-03 57.770 57
CPL 0.851 0.404 208.0 -58.8 5.18e-02 2.28e-02 56.100 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: 0.896000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.020 -5.360 3.660
T90 7.216 -4.772 2.444
T50 0.544 0.020 0.564
Peak 1.000 -0.128 0.872
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.5810 56.7435 0.0100 18.0357 121.7817 0.9300770 19.216 TRIG_00817345
Foreground time interval of the image:
-5.360 3.660 (delta_t = 9.020 [sec])
Background time interval of the image:
-239.304 -5.360 (delta_t = 233.944 [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 -5.360 sec. to 3.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45328 ( -0.143026 0.144205 )
Norm@50keV : 6.53552E-03 ( -0.000518919 0.000516363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.451820e-01
Photon flux (15-150 keV) in 9.02 sec: 0.806068 ( -0.0634016 0.0635102 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63773e-07 ( -5.00048e-08 5.04517e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.360 sec. to 3.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45054 ( -0.403301 0.177967 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 6.55672E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.98 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 56 degrees of freedom
# Null hypothesis probability = 2.168197e-01
Photon flux (15-150 keV) in 9.02 sec: 0.805757 ( -0.06312 0.063442 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63591e-07 ( -5.07483e-08 4.99537e-08 ) ergs/cm2
Band function
Time interval is from -5.360 sec. to 3.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29277 ( 1.29277 1.29277 )
beta : -1.45327 ( 1.45327 0.143021 )
Epeak [keV] : 45.5316 ( -45.5316 -45.5316 )
Norm@50keV : 9.88290E-03 ( -0.00385205 0.948567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.906659e-01
Photon flux (15-150 keV) in 9.02 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] : 15.3248 (-1.67253 1.95301)
R^2/D10^2 : 8.31427E-02 (-0.0279784 0.0411326)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.49 using 59 PHA bins.
# Reduced chi-squared = 1.9911 for 57 degrees of freedom
# Null hypothesis probability = 1.274887e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.674e-08 5.651e-09
25- 50 1.488e-07 1.597e-08
50-150 2.401e-07 3.874e-08
15-150 4.257e-07 4.375e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.4767 -200)
Norm : 3.28251 (-0.254383 0.254383)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.05 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.704639e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.406e-08 7.103e-09
25- 50 1.425e-07 1.903e-08
50-150 3.124e-07 1.369e-07
15-150 5.290e-07 1.610e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.38425 (-1.7059 1.83242)
R1^2/D10^2 : 0.721780 (-0.371074 1.04355)
kT2 [keV] : 32.3651 (-8.09492 17.9608)
R2^2/D10^2 : 5.41412E-03 (-0.00392783 0.00894258)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.62 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Null hypothesis probability = 1.546518e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.771e-08 1.990e-08
25- 50 1.395e-07 3.523e-08
50-150 3.652e-07 1.733e-07
15-150 5.724e-07 1.992e-07
Peak spectrum fit
Power-law model
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16529 ( -0.104072 0.103986 )
Norm@50keV : 3.73536E-02 ( -0.0022006 0.00220057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.77 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.465488e-01
Photon flux (15-150 keV) in 1 sec: 4.36433 ( -0.263783 0.264062 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82786e-07 ( -2.52562e-08 2.53523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.851264 ( -0.451378 0.356631 )
Epeak [keV] : 207.955 ( -90.3593 -207.952 )
Norm@50keV : 5.17805E-02 ( -0.0159742 0.0297232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.709507e-01
Photon flux (15-150 keV) in 1 sec: 4.30512 ( -0.27484 0.27472 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77665e-07 ( -2.6623e-08 2.6483e-08 ) ergs/cm2
Band function
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.937156 ( 0.937156 0.937156 )
beta : -1.16530 ( -0.103944 0.104096 )
Epeak [keV] : 52.2544 ( )
Norm@50keV : 6.59936E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.77 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.732237e-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] : 20.0441 (-1.50587 1.66271)
R^2/D10^2 : 0.204093 (-0.0463367 0.0588207)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.87 using 59 PHA bins.
# Reduced chi-squared = 1.7697 for 57 degrees of freedom
# Null hypothesis probability = 3.061096e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.579e-08 1.790e-09
25- 50 7.878e-08 6.820e-09
50-150 2.347e-07 2.320e-08
15-150 3.293e-07 2.545e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-10.402 -200)
Norm : 17.9165 (-1.08185 1.08185)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.08 using 59 PHA bins.
# Reduced chi-squared = 1.668 for 57 degrees of freedom
# Null hypothesis probability = 1.161133e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.462e-08 2.950e-09
25- 50 8.584e-08 8.835e-09
50-150 1.883e-07 3.780e-08
15-150 3.187e-07 4.675e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57436 (-1.7793 2.39941)
R1^2/D10^2 : 6.86544 (-4.90226 29.9328)
kT2 [keV] : 25.9506 (-3.25095 5.20403)
R2^2/D10^2 : 7.98837E-02 (-0.0378176 0.0470734)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.241495e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.446e-08 1.410e-08
25- 50 7.434e-08 1.476e-08
50-150 2.641e-07 4.125e-08
15-150 3.730e-07 5.335e-08
Plot creation:
Sat Mar 24 11:38:55 EDT 2018