batgrbproduct analysis for trigger=753445
batgrbproduct Analysis for Trigger=753445
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 May 19 09:49:54 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger753445/batgroup_hand_proc
======================================================================
Trigger: 00753445 Segment: 000
BAT Trigger Time: 516863421.888 [s; MET]
Trigger Stop: 516863425.984 [s; MET]
UTC: 2017-05-19T05:10:02.805780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 163.45003598818 Dec: 25.3780364633414 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.3
Image Trigger?: NO
Rate S/N Ratio: 14.3527000944073 [ if not an image trigger ]
Image S/N Ratio: 10.3
Flight Position: [ source = BAT ]
RA: 163.45003598818 Dec: 25.3780364633414 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 163.428739744965 Dec: 25.3740600477288 [deg; J2000]
{ 10h 53m 42.9s , +25d 22' 26.6" }
+/- 1.47065771709123 [arcmin] (estimated 90% radius based on SNR)
+/- 0.489446529067231 [arcmin] (formal 1-sigma fit error)
SNR: 17.5313792761136
Angular difference between Flight and Ground position is 1.178883 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 216.3599999547 +/- 49.4043300783148
Measured from: -22.6800000071526
to: 193.679999947548 [s; relative to TRIGTIME]
T50: 19.4559999704361 +/- 157.510759616317
Measured from: -6.10000002384186
to: 13.3559999465942 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.835999965667725
to: 1.83599996566772 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.4800000190735
to: 255.648000001907 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.866001 0.761328 0.500658 0.079229
0.094675 0.094881 0.084557 0.077461 [error]
Peak 0.022130 0.039255 0.018724 0.010289
0.005912 0.005979 0.005436 0.004619 [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 2.36e-07 3.33e-07 3.49e-07 6.71e-07 1.13e-06 1.59e-06 erg/cm2
Error 4.34e-08 4.25e-08 8.23e-08 3.20e-07 1.84e-07 4.06e-07 erg/cm2
Peak flux Power-law 2.25e-01 2.20e-01 1.51e-01 1.63e-01 6.62e-01 7.59e-01 ph/cm2/s
Error 7.52e-02 4.63e-02 4.42e-02 9.79e-02 1.36e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.38e-07 3.34e-07 3.50e-07 6.12e-07 1.12e-06 1.53e-06 erg/cm2
Error 4.35e-08 4.50e-08 8.23e-08 4.34e-07 1.86e-07 4.95e-07 erg/cm2
Peak flux Cutoff-PL 2.25e-01 2.20e-01 1.51e-01 1.62e-01 6.61e-01 7.58e-01 ph/cm2/s
Error 7.52e-02 5.19e-02 4.45e-02 1.39e-01 1.35e-01 1.88e-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 1.936 0.261 - - 4.32e-04 7.25e-05 35.750 57
CPL 1.933 0.943 741.7 0.0 4.34e-04 0.00e+00 35.750 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 1.545 0.380 - - 5.23e-03 1.17e-03 59.790 57
CPL 1.543 2.051 10000.0 0.0 5.25e-03 -2.02e-03 59.790 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: 38.720000 sec.
T50 in the 50-300 keV band: 20.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 284.128 -28.480 255.648
T90 216.360 -22.680 193.680
T50 19.456 -6.100 13.356
Peak 1.000 0.836 1.836
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
163.4287 25.3741 0.0110 13.0298 160.6330 1.6273780 17.531 TRIG_00753445
Foreground time interval of the image:
-28.480 35.613 (delta_t = 64.093 [sec])
Background time interval of the image:
-713.287 -695.698 (delta_t = 17.589 [sec])
-239.888 -28.480 (delta_t = 211.408 [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 -28.480 sec. to 255.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93561 ( -0.25182 0.270928 )
Norm@50keV : 4.32157E-04 ( -7.38772e-05 7.10324e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.75 using 59 PHA bins.
# Reduced chi-squared = 0.6272 for 57 degrees of freedom
# Null hypothesis probability = 9.876462e-01
Photon flux (15-150 keV) in 284.1 sec: 6.29780E-02 ( -0.00790417 0.0079043 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12942e-06 ( -1.81128e-07 1.87339e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.480 sec. to 255.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93286 ( -0.729503 1.15602 )
Epeak [keV] : 741.697 ( )
Norm@50keV : 4.33820E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.75 using 59 PHA bins.
# Reduced chi-squared = 0.6385 for 56 degrees of freedom
# Null hypothesis probability = 9.839855e-01
Photon flux (15-150 keV) in 284.1 sec: 6.29596E-02 ( -0.0079032 0.0079015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12352e-06 ( -1.83145e-07 1.89608e-07 ) ergs/cm2
Band function
Time interval is from -28.480 sec. to 255.648 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51907 ( 1.53083 1.53083 )
beta : -1.93515 ( 1.93555 0.251784 )
Epeak [keV] : 16.3052 ( -14.3316 -14.3316 )
Norm@50keV : 1.10936E-03 ( -0.00113685 0.596765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.75 using 59 PHA bins.
# Reduced chi-squared = 0.6501 for 55 degrees of freedom
# Null hypothesis probability = 9.794129e-01
Photon flux (15-150 keV) in 284.1 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] : 9.85454 (-1.69176 2.0612)
R^2/D10^2 : 2.97822E-02 (-0.0150632 0.0310888)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.748527e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.665e-07 3.869e-08
25- 50 4.054e-07 7.259e-08
50-150 2.028e-07 7.435e-08
15-150 7.746e-07 1.406e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.6214 (-29.0732 64.8827)
Norm : 0.295557 (-0.0546273 0.0723248)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.98 using 59 PHA bins.
# Reduced chi-squared = 0.6662 for 57 degrees of freedom
# Null hypothesis probability = 9.753646e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.174e-07 3.966e-08
25- 50 3.553e-07 5.426e-08
50-150 4.914e-07 2.667e-07
15-150 1.064e-06 2.544e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.69371 (-1.68318 2.15909)
R1^2/D10^2 : 0.390483 (-0.290593 2.64876)
kT2 [keV] : 19.6292 (-6.11252 16.6931)
R2^2/D10^2 : 1.80926E-03 (-0.00157635 0.00579691)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.93 using 59 PHA bins.
# Reduced chi-squared = 0.6714 for 55 degrees of freedom
# Null hypothesis probability = 9.708724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.465e-07 1.257e-07
25- 50 3.051e-07 1.362e-07
50-150 5.423e-07 3.186e-07
15-150 1.094e-06 5.208e-07
Peak spectrum fit
Power-law model
Time interval is from 0.836 sec. to 1.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54493 ( -0.372955 0.387241 )
Norm@50keV : 5.23392E-03 ( -0.00119249 0.00115508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.746284e-01
Photon flux (15-150 keV) in 1 sec: 0.661615 ( -0.1357 0.135761 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93089e-08 ( -1.20756e-08 1.25015e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.836 sec. to 1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54291 ( -1.66183 2.4396 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.24782E-03 ( -0.00120232 -0.00524796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.396630e-01
Photon flux (15-150 keV) in 1 sec: 0.661392 ( -0.135243 0.1357 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93333e-08 ( -1.38143e-08 1.23068e-08 ) ergs/cm2
Band function
Time interval is from 0.836 sec. to 1.836 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.447371 ( 0.968945 0.968945 )
beta : -1.75222 ( 1.67746 0.489097 )
Epeak [keV] : 49.7080 ( -48.9401 212.317 )
Norm@50keV : 2.54832E-02 ( -0.0281229 742943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.151721e-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] : 11.4849 (-2.51119 3.83304)
R^2/D10^2 : 0.189140 (-0.12187 0.274645)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.07 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.164301e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.251e-09 2.342e-09
25- 50 1.568e-08 7.183e-09
50-150 1.206e-08 6.671e-09
15-150 3.299e-08 1.103e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.996 (-126.672 -199.057)
Norm : 2.68990 (-0.550447 0.703093)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.666833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.700e-09 4.040e-09
25- 50 1.288e-08 7.695e-09
50-150 2.824e-08 1.620e-08
15-150 4.783e-08 2.781e-08
Double BB
#Fit statistic : Chi-Squared = 57.37 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.30 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 55 degrees of freedom
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 2.066403e-01
# Null hypothesis probability = 3.862216e-01
# Null hypothesis probability = 3.872708e-01
# Null hypothesis probability = 3.899602e-01
# Null hypothesis probability = 3.906271e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.866e-09 2.603e-09
25- 50 1.471e-08 8.575e-09
50-150 1.386e-08 8.718e-09
15-150 3.444e-08 1.860e-08
Plot creation:
Fri May 19 10:25:45 EDT 2017