batgrbproduct analysis for trigger=817564
batgrbproduct Analysis for Trigger=817564
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): Sun Mar 25 16:53:28 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger817564/batgroup_hand_proc
======================================================================
Trigger: 00817564 Segment: 000
BAT Trigger Time: 543635603.52 [s; MET]
Trigger Stop: 543635604.032 [s; MET]
UTC: 2018-03-25T01:53:02.842480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 157.431990917944 Dec: 24.4392523978687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.22
Image Trigger?: NO
Rate S/N Ratio: 19.6468827043885 [ if not an image trigger ]
Image S/N Ratio: 10.22
Flight Position: [ source = BAT ]
RA: 157.431990917944 Dec: 24.4392523978687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 157.41608627085 Dec: 24.4610193873526 [deg; J2000]
{ 10h 29m 39.9s , +24d 27' 39.7" }
+/- 1.13584751102015 [arcmin] (estimated 90% radius based on SNR)
+/- 0.455510262292124 [arcmin] (formal 1-sigma fit error)
SNR: 25.3565267258264
Angular difference between Flight and Ground position is 1.568543 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 94.1439999341965 +/- 1.47985949191353
Measured from: 1.75199997425079
to: 95.8959999084473 [s; relative to TRIGTIME]
T50: 5.07999992370605 +/- 0.498477680674676
Measured from: 78.5680000782013
to: 83.6480000019073 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 80.7519999742508
to: 81.7519999742508 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 107.888000011444 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.020440 3.417914 3.180213 0.876699
0.068324 0.073195 0.065947 0.055128 [error]
Peak 0.213281 0.406780 0.462049 0.171957
0.010046 0.012983 0.013886 0.010496 [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 6.02e-07 1.35e-06 2.38e-06 9.88e-06 6.50e-06 1.42e-05 erg/cm2
Error 3.26e-08 4.22e-08 6.72e-08 6.65e-07 1.72e-07 6.92e-07 erg/cm2
Peak flux Power-law 1.84e+00 2.71e+00 2.98e+00 6.17e+00 9.41e+00 1.37e+01 ph/cm2/s
Error 1.36e-01 1.19e-01 1.09e-01 5.12e-01 3.22e-01 5.57e-01 ph/cm2/s
Fluence Cutoff-PL 5.66e-07 1.36e-06 2.44e-06 7.37e-06 6.42e-06 1.17e-05 erg/cm2
Error 4.27e-08 4.45e-08 7.97e-08 1.72e-06 1.86e-07 1.71e-06 erg/cm2
Peak flux Cutoff-PL 1.80e+00 2.67e+00 2.99e+00 6.35e+00 9.39e+00 1.38e+01 ph/cm2/s
Error 1.31e-01 1.29e-01 1.38e-01 1.13e+00 3.24e-01 1.18e+00 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 1.178 0.047 - - 5.90e-03 1.48e-04 67.840 57
CPL 0.948 0.188 266.2 408.1 7.43e-03 1.37e-03 63.270 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 0.862 0.062 - - 8.20e-02 2.81e-03 41.590 57
CPL 0.856 0.162 9998.0 0.0 8.25e-02 1.45e-02 41.550 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: 89.152000 sec.
T50 in the 50-300 keV band: 3.520000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 107.896 -0.008 107.888
T90 94.144 1.752 95.896
T50 5.080 78.568 83.648
Peak 1.000 80.752 81.752
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
157.4161 24.4610 0.0076 15.5980 138.0260 1.1548683 25.357 TRIG_00817564
Foreground time interval of the image:
-0.008 10.981 (delta_t = 10.989 [sec])
Background time interval of the image:
-239.520 -0.008 (delta_t = 239.512 [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 -0.008 sec. to 107.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17803 ( -0.0471231 0.0469008 )
Norm@50keV : 5.90429E-03 ( -0.000148539 0.000148421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.84 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.541024e-01
Photon flux (15-150 keV) in 107.9 sec: 0.690976 ( -0.0185738 0.0186142 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50415e-06 ( -1.71854e-07 1.72121e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 107.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.948304 ( -0.192381 0.184225 )
Epeak [keV] : 266.172 ( -94.2475 721.976 )
Norm@50keV : 7.42647E-03 ( -0.00121878 0.00152243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.351704e-01
Photon flux (15-150 keV) in 107.9 sec: 0.680620 ( -0.020163 0.020214 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.42307e-06 ( -1.86041e-07 1.85318e-07 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 107.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.104903 ( -0.709544 0.439648 )
beta : -1.24097 ( 1.2403 0.0732279 )
Epeak [keV] : 62.1704 ( -31.8247 190.116 )
Norm@50keV : 2.63281E-02 ( -0.0166045 86.9114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.357983e-01
Photon flux (15-150 keV) in 107.9 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] : 20.6690 ( )
R^2/D10^2 : 2.81260E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 315.94 using 59 PHA bins.
# Reduced chi-squared = 5.5428 for 57 degrees of freedom
# Null hypothesis probability = 1.508917e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.466e-07 1.300e-08
25- 50 1.255e-06 4.748e-08
50-150 3.990e-06 1.645e-07
15-150 5.491e-06 1.597e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.94547 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 258.04 using 59 PHA bins.
# Reduced chi-squared = 4.5270 for 57 degrees of freedom
# Null hypothesis probability = 2.265997e-27
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.914e-07 2.180e-08
25- 50 1.522e-06 3.938e-08
50-150 3.339e-06 8.254e-08
15-150 5.653e-06 1.683e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.35507 (-0.887109 0.975905)
R1^2/D10^2 : 0.306821 (-0.0878934 0.133501)
kT2 [keV] : 32.8490 (-3.01093 4.0941)
R2^2/D10^2 : 5.31858E-03 (-0.0016934 0.00203575)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.544112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.222e-07 5.071e-08
25- 50 1.396e-06 9.819e-08
50-150 4.522e-06 3.507e-07
15-150 6.441e-06 3.944e-07
Peak spectrum fit
Power-law model
Time interval is from 80.752 sec. to 81.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.862383 ( -0.062463 0.0620003 )
Norm@50keV : 8.19774E-02 ( -0.00281845 0.00281093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.59 using 59 PHA bins.
# Reduced chi-squared = 0.7296 for 57 degrees of freedom
# Null hypothesis probability = 9.376083e-01
Photon flux (15-150 keV) in 1 sec: 9.40908 ( -0.321844 0.322068 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3376e-07 ( -3.53852e-08 3.55099e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 80.752 sec. to 81.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.855530 ( -0.245101 0.0794012 )
Epeak [keV] : 9998.01 ( -9997.89 -9997.89 )
Norm@50keV : 8.25362E-02 ( -0.0027927 0.0262562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.55 using 59 PHA bins.
# Reduced chi-squared = 0.7420 for 56 degrees of freedom
# Null hypothesis probability = 9.249965e-01
Photon flux (15-150 keV) in 1 sec: 9.39379 ( -0.31671 0.3316 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31379e-07 ( -3.5954e-08 3.7513e-08 ) ergs/cm2
Band function
Time interval is from 80.752 sec. to 81.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.842608 ( 0.842608 0.842608 )
beta : -0.862384 ( -0.061993 0.0624761 )
Epeak [keV] : 16.2901 ( -16.2901 -16.2901 )
Norm@50keV : 0.116214 ( -0.0370116 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.59 using 59 PHA bins.
# Reduced chi-squared = 0.7561 for 55 degrees of freedom
# Null hypothesis probability = 9.091696e-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] : 24.5048 ( )
R^2/D10^2 : 0.248607 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 182.42 using 59 PHA bins.
# Reduced chi-squared = 3.2003 for 57 degrees of freedom
# Null hypothesis probability = 4.829565e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.621e-08 1.625e-09
25- 50 1.471e-07 7.650e-09
50-150 6.569e-07 3.555e-08
15-150 8.303e-07 3.790e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 36.6556 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 359.80 using 59 PHA bins.
# Reduced chi-squared = 6.3123 for 57 degrees of freedom
# Null hypothesis probability = 1.570958e-45
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.128e-08 3.295e-09
25- 50 1.756e-07 6.500e-09
50-150 3.851e-07 1.390e-08
15-150 6.519e-07 2.385e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.31789 (-1.39614 1.58433)
R1^2/D10^2 : 2.50946 (-0.874763 1.52981)
kT2 [keV] : 42.4560 (-6.1241 10.3047)
R2^2/D10^2 : 4.32452E-02 (-0.0193886 0.0214615)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.75 using 59 PHA bins.
# Reduced chi-squared = 0.7409 for 55 degrees of freedom
# Null hypothesis probability = 9.240239e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.278e-08 7.475e-09
25- 50 1.636e-07 1.845e-08
50-150 7.269e-07 9.660e-08
15-150 9.432e-07 1.102e-07
Plot creation:
Sun Mar 25 17:00:43 EDT 2018