batgrbproduct Analysis for Trigger=678197
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): Tue Mar 8 13:08:28 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger678197/GCN5_download_cron
======================================================================
Trigger: 00678197 Segment: 000
BAT Trigger Time: 479059304 [s; MET]
Trigger Stop: 479059368 [s; MET]
UTC: 2016-03-07T16:01:28.054460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 75.1553666430309 Dec: 45.0788117010882 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.29
Flight Position: [ source = BAT ]
RA: 75.1553666430309 Dec: 45.0788117010882 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.0966816252204 Dec: 45.0977631873392 [deg; J2000]
{ 05h 00m 23.2s , +45d 05' 51.9" }
+/- 4.46932305108502 [arcmin] (estimated 90% radius based on SNR)
+/- 2.54143984767847 [arcmin] (formal 1-sigma fit error)
SNR: 3.58262702788193
Angular difference between Flight and Ground position is 2.733668 arcmin
Partial Coding Fraction: 0.2285156 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.258145 0.505572 -0.009019 -0.236324
0.095561 0.098203 0.086355 0.075435 [error]
Peak 0.258145 0.505572 -0.009019 -0.236324
0.095561 0.098203 0.086355 0.075435 [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 1.42e-07 1.33e-07 8.64e-08 8.50e-08 3.96e-07 4.41e-07 erg/cm2
Error 5.60e-08 5.10e-08 5.68e-08 1.14e-07 1.61e-07 2.12e-07 erg/cm2
Peak flux Power-law 7.33e-02 3.82e-02 1.24e-02 5.11e-03 1.27e-01 1.29e-01 ph/cm2/s
Error 2.92e-02 1.47e-02 7.97e-03 6.43e-03 4.52e-02 4.61e-02 ph/cm2/s
Fluence Cutoff-PL 8.13e-08 2.68e-07 1.65e-08 2.76e-13 3.66e-07 3.67e-07 erg/cm2
Error 4.54e-08 8.27e-08 3.28e-08 2.27e-10 7.94e-08 1.06e-07 erg/cm2
Peak flux Cutoff-PL 3.75e-02 7.84e-02 3.03e-03 2.92e-08 1.19e-01 1.19e-01 ph/cm2/s
Error 2.26e-02 2.29e-02 5.39e-03 2.06e-05 3.56e-02 3.56e-02 ph/cm2/s
Fluence Band 1.10e-07 2.44e-07 3.62e-08 2.89e-10 3.92e-07 3.92e-07 erg/cm2
Error 4.35e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.55e-02 7.25e-02 6.65e-03 2.82e-05 1.33e-01 1.33e-01 ph/cm2/s
Error 2.75e-02 2.19e-02 -------- 1.36e-03 -------- 3.93e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.628 0.618 - - 5.94e-04 3.10e-04 59.550 57
CPL -10.000 0.000 32.4 0.0 5.81e+04 0.00e+00 46.440 56
The chi2 of BB fit is 49.98 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 2.628 0.618 - - 5.94e-04 3.10e-04 59.550 57
CPL -10.000 0.000 32.4 0.0 5.81e+04 0.00e+00 46.440 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.0967 +45.0978 0.0536 51.3 -164.7 0.6732 3.6 TRIG_00678197
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62806 ( -0.537913 0.697654 )
Norm@50keV : 5.94228E-04 ( -0.000299744 0.000319491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.55 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.828552e-01
Photon flux (15-150 keV) in 64 sec: 0.126749 ( -0.0451387 0.0452131 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95508e-07 ( -1.54265e-07 1.68091e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( )
Epeak [keV] : 32.4247 ( )
Norm@50keV : 5.81328E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8293 for 56 degrees of freedom
# Null hypothesis probability = 8.149954e-01
Photon flux (15-150 keV) in 64 sec: 0.118950 0.117724 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26584e-17 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.99495 -5 )
beta : -9.37167 ( 9.37167 19.3041 )
Epeak [keV] : 32.0823 ( -4.91013 5.52944 )
Norm@50keV : 40.8846 ( -11.7007 79.7494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8711 for 55 degrees of freedom
# Null hypothesis probability = 7.399513e-01
Photon flux (15-150 keV) in 64 sec: 0.133176 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92114e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.99754 (-1.68808 2.12285)
R^2/D10^2 : 0.171559 (-0.108851 0.280746)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.8768 for 57 degrees of freedom
# Null hypothesis probability = 7.335776e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-07 7.846e-08
25- 50 2.221e-07 1.343e-07
50-150 5.826e-08 4.614e-08
15-150 4.073e-07 2.483e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.4882 (-11.9997 22.5998)
Norm : 1.14103 (-0.494558 0.878443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9628 for 57 degrees of freedom
# Null hypothesis probability = 5.550935e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-07 9.104e-08
25- 50 1.667e-07 1.055e-07
50-150 8.925e-08 7.307e-08
15-150 4.033e-07 2.467e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.99245 (-7.99388 -7.99388)
R1^2/D10^2 : 5.10039E-02 (-0.051134 -0.051134)
kT2 [keV] : 8.00211 (-7.99607 -7.99607)
R2^2/D10^2 : 0.120395 (-0.120567 -0.120567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.9087 for 55 degrees of freedom
# Null hypothesis probability = 6.664526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.269e-07 1.063e+01
25- 50 2.221e-07 8.685e+01
50-150 5.830e-08 2.118e+03
15-150 4.073e-07 2.164e+03
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62806 ( -0.537913 0.697654 )
Norm@50keV : 5.94228E-04 ( -0.000299744 0.000319491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.55 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.828552e-01
Photon flux (15-150 keV) in 64 sec: 0.126749 ( -0.0451387 0.0452131 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95508e-07 ( -1.54265e-07 1.68091e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( )
Epeak [keV] : 32.4247 ( )
Norm@50keV : 5.81328E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8293 for 56 degrees of freedom
# Null hypothesis probability = 8.149954e-01
Photon flux (15-150 keV) in 64 sec: 0.118950 0.117724 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26584e-17 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.99495 -5 )
beta : -9.37167 ( 9.37167 19.3041 )
Epeak [keV] : 32.0823 ( -4.91013 5.52944 )
Norm@50keV : 40.8846 ( -11.7007 79.7494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8711 for 55 degrees of freedom
# Null hypothesis probability = 7.399513e-01
Photon flux (15-150 keV) in 64 sec: 0.133176 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92114e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.99754 (-1.68808 2.12285)
R^2/D10^2 : 0.171559 (-0.108851 0.280746)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.8768 for 57 degrees of freedom
# Null hypothesis probability = 7.335776e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-07 7.904e-08
25- 50 2.221e-07 1.360e-07
50-150 5.826e-08 4.214e-08
15-150 4.073e-07 2.563e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.4882 (-11.9997 22.5998)
Norm : 1.14103 (-0.494558 0.878443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9628 for 57 degrees of freedom
# Null hypothesis probability = 5.550935e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-07 8.345e-08
25- 50 1.667e-07 1.024e-07
50-150 8.925e-08 7.312e-08
15-150 4.033e-07 2.469e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.99245 (-7.99388 -7.99388)
R1^2/D10^2 : 5.10039E-02 (-0.051134 -0.051134)
kT2 [keV] : 8.00211 (-7.99607 -7.99607)
R2^2/D10^2 : 0.120395 (-0.120567 -0.120567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.9087 for 55 degrees of freedom
# Null hypothesis probability = 6.664526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.269e-07 1.057e+01
25- 50 2.221e-07 8.867e+01
50-150 5.830e-08 2.032e+03
15-150 4.073e-07 2.417e+03
Plot creation:
Tue Mar 8 13:14:01 EST 2016