batgrbproduct Analysis for Trigger=664078
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Nov 18 09:29:00 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger664078/batgroup_hand_proc
======================================================================
Trigger: 00664078 Segment: 000
BAT Trigger Time: 469508805.44 [s; MET]
Trigger Stop: 469508805.952 [s; MET]
UTC: 2015-11-18T03:06:30.010020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 57.1581445545425 Dec: 65.8686019549024 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.82
Image Trigger?: NO
Rate S/N Ratio: 11.916375287813 [ if not an image trigger ]
Image S/N Ratio: 7.82
Flight Position: [ source = BAT ]
RA: 57.1581445545425 Dec: 65.8686019549024 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 57.1692460959284 Dec: 65.8894350881606 [deg; J2000]
{ 03h 48m 40.6s , +65d 53' 22.0" }
+/- 1.43349485348923 [arcmin] (estimated 90% radius based on SNR)
+/- 0.596768106524661 [arcmin] (formal 1-sigma fit error)
SNR: 18.1842471555778
Angular difference between Flight and Ground position is 1.279284 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 23.4119999408722 +/- 10.5252009684499
Measured from: 0.328000009059906
to: 23.7399999499321 [s; relative to TRIGTIME]
T50: 5.58799993991852 +/- 2.93622953938923
Measured from: 4.15200001001358
to: 9.7399999499321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.40799999237061
to: 7.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0440000295639038
to: 30.811999976635 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.262660 0.330835 0.201989 0.016441
0.030437 0.030393 0.026405 0.022808 [error]
Peak 0.043791 0.064064 0.035024 0.008602
0.006003 0.006449 0.005465 0.004387 [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 8.28e-08 1.27e-07 1.46e-07 3.21e-07 4.51e-07 6.77e-07 erg/cm2
Error 1.31e-08 1.36e-08 2.53e-08 1.13e-07 5.89e-08 1.38e-07 erg/cm2
Peak flux Power-law 4.29e-01 4.03e-01 2.63e-01 2.65e-01 1.20e+00 1.36e+00 ph/cm2/s
Error 7.76e-02 4.90e-02 4.33e-02 8.39e-02 1.45e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 8.01e-08 1.33e-07 1.44e-07 1.61e-07 4.32e-07 5.19e-07 erg/cm2
Error 1.43e-08 1.84e-08 2.78e-08 1.76e-07 6.92e-08 2.10e-07 erg/cm2
Peak flux Cutoff-PL 3.76e-01 4.58e-01 2.74e-01 8.19e-02 1.17e+00 1.19e+00 ph/cm2/s
Error 8.78e-02 6.67e-02 5.15e-02 8.36e-02 1.47e-01 1.64e-01 ph/cm2/s
Fluence Band 7.73e-08 1.38e-07 1.37e-07 2.40e-07 4.32e-07 5.94e-07 erg/cm2
Error 1.53e-08 -------- 2.84e-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 1.799 0.197 - - 1.59e-03 2.02e-04 50.940 57
CPL 1.422 0.812 65.6 -6.7 2.61e-03 3.38e-03 50.220 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 1.616 0.196 - - 9.32e-03 1.21e-03 72.110 57
CPL 0.525 0.944 61.2 33.3 3.70e-02 7.13e-02 66.780 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: 3.328000 sec.
T50 in the 50-300 keV band: 2.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 30.768 0.044 30.812
T90 23.412 0.328 23.740
T50 5.588 4.152 9.740
Peak 1.000 6.408 7.408
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
57.1692 65.8894 0.0106 15.8914 12.6447 0.6879102 18.184 TRIG_00664078
Foreground time interval of the image:
0.044 11.061 (delta_t = 11.017 [sec])
Background time interval of the image:
-239.440 0.044 (delta_t = 239.484 [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 0.044 sec. to 30.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79878 ( -0.193003 0.200832 )
Norm@50keV : 1.59090E-03 ( -0.00020407 0.000199846 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.94 using 59 PHA bins.
# Reduced chi-squared = 0.8937 for 57 degrees of freedom
# Null hypothesis probability = 7.005583e-01
Photon flux (15-150 keV) in 30.77 sec: 0.219119 ( -0.02354 0.0235442 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50676e-07 ( -5.82525e-08 5.94775e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 30.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42181 ( -0.898739 0.725152 )
Epeak [keV] : 65.6010 ( -52.2363 -65.6026 )
Norm@50keV : 2.61206E-03 ( -0.000835835 0.0059219 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.22 using 59 PHA bins.
# Reduced chi-squared = 0.8969 for 56 degrees of freedom
# Null hypothesis probability = 6.922203e-01
Photon flux (15-150 keV) in 30.77 sec: 0.215877 ( -0.023729 0.024375 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31722e-07 ( -6.84232e-08 7.00479e-08 ) ergs/cm2
Band function
Time interval is from 0.044 sec. to 30.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.87501E-02 ( 0.247657 0.247657 )
beta : -2.02436 ( 2.01507 0.315974 )
Epeak [keV] : 33.7828 ( -33.8022 107.029 )
Norm@50keV : 3.00442E-02 ( -0.030934 84.0727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 55 degrees of freedom
# Null hypothesis probability = 7.161931e-01
Photon flux (15-150 keV) in 30.77 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32479e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5392 (-1.39844 1.65458)
R^2/D10^2 : 8.44053E-02 (-0.0353131 0.0593735)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.441376e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.968e-08 1.189e-08
25- 50 1.595e-07 2.303e-08
50-150 9.675e-08 2.769e-08
15-150 3.160e-07 4.171e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.1742 (-31.3648 64.2825)
Norm : 0.981199 (-0.146711 0.17565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.24 using 59 PHA bins.
# Reduced chi-squared = 0.8814 for 57 degrees of freedom
# Null hypothesis probability = 7.246777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.888e-08 1.255e-08
25- 50 1.350e-07 1.843e-08
50-150 2.126e-07 9.656e-08
15-150 4.265e-07 1.074e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.73904 (-1.59113 1.78498)
R1^2/D10^2 : 0.334525 (-0.181733 0.300407)
kT2 [keV] : 25.4143 (-8.43146 28.6458)
R2^2/D10^2 : 2.26156E-03 (-0.00203463 0.00832155)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8750 for 55 degrees of freedom
# Null hypothesis probability = 7.326635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.981e-08 3.402e-08
25- 50 1.359e-07 5.357e-08
50-150 2.247e-07 1.231e-07
15-150 4.404e-07 1.877e-07
Peak spectrum fit
Power-law model
Time interval is from 6.408 sec. to 7.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61641 ( -0.192694 0.198829 )
Norm@50keV : 9.32107E-03 ( -0.00122115 0.00120618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.11 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.567347e-02
Photon flux (15-150 keV) in 1 sec: 1.20397 ( -0.144716 0.144757 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.70036e-08 ( -1.21001e-08 1.22944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.408 sec. to 7.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.524768 ( -1.05638 0.832579 )
Epeak [keV] : 61.2062 ( -13.5085 53.1123 )
Norm@50keV : 3.70474E-02 ( -0.0370471 0.105648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.78 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 56 degrees of freedom
# Null hypothesis probability = 1.534448e-01
Photon flux (15-150 keV) in 1 sec: 1.16959 ( -0.14666 0.14685 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.97935e-08 ( -1.2933e-08 1.33952e-08 ) ergs/cm2
Band function
Time interval is from 6.408 sec. to 7.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.524704 ( -0.651647 1.39381 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 61.1937 ( -13.4971 53.1574 )
Norm@50keV : 3.70518E-02 ( -0.0370518 0.105789 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.78 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Null hypothesis probability = 1.325940e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21942e-08 ( -8.21872e-08 -1.241e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4510 (-1.64093 1.9391)
R^2/D10^2 : 0.271901 (-0.111094 0.18047)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.10 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.436516e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.935e-09 1.858e-09
25- 50 2.934e-08 4.715e-09
50-150 2.801e-08 7.910e-09
15-150 6.629e-08 1.119e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 146.543 (-57.7103 -145.072)
Norm : 5.04836 (-0.651881 0.798015)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.91 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.340789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.299e-08 3.968e-09
25- 50 2.400e-08 1.257e-08
50-150 4.691e-08 2.778e-08
15-150 8.390e-08 4.673e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43371 (-2.8384 2.94863)
R1^2/D10^2 : 1.00694 (-0.512889 1.87126)
kT2 [keV] : 21.0359 (-7.94356 26.9982)
R2^2/D10^2 : 2.56751E-02 (-0.0154323 0.0734368)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.55 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 55 degrees of freedom
# Null hypothesis probability = 1.560920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.162e-08 6.775e-09
25- 50 2.558e-08 1.366e-08
50-150 3.939e-08 2.276e-08
15-150 7.658e-08 4.109e-08
Plot creation:
Wed Nov 18 09:36:51 EST 2015