batgrbproduct Analysis for Trigger=721234
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): Tue Nov 8 13:36:31 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger721234/batgroup_hand_proc
======================================================================
Trigger: 00721234 Segment: 000
BAT Trigger Time: 500268770.304 [s; MET]
Trigger Stop: 500268774.4 [s; MET]
UTC: 2016-11-08T03:32:33.177140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 180.783723776048 Dec: 24.8691396176327 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.76
Image Trigger?: NO
Rate S/N Ratio: 10.5830052442584 [ if not an image trigger ]
Image S/N Ratio: 7.76
Flight Position: [ source = BAT ]
RA: 180.783723776048 Dec: 24.8691396176327 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 180.775607929856 Dec: 24.9053956928027 [deg; J2000]
{ 12h 03m 06.1s , +24d 54' 19.4" }
+/- 1.87500025485274 [arcmin] (estimated 90% radius based on SNR)
+/- 1.29868153392242 [arcmin] (formal 1-sigma fit error)
SNR: 12.3912887817104
Angular difference between Flight and Ground position is 2.219761 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 105.083999991417 +/- 11.8942948022011
Measured from: -0.37200003862381
to: 104.711999952793 [s; relative to TRIGTIME]
T50: 75.907999932766 +/- 11.3908449223245
Measured from: 10.8479999899864
to: 86.7559999227524 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.80400002002716
to: -0.804000020027161 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.90400004386902
to: 126.755999982357 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.744263 0.702184 0.448383 0.041027
0.061018 0.060770 0.051674 0.043324 [error]
Peak 0.029990 0.032490 0.006488 0.002901
0.005604 0.005604 0.004623 0.003771 [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 2.02e-07 3.00e-07 3.33e-07 6.96e-07 1.05e-06 1.53e-06 erg/cm2
Error 2.71e-08 2.69e-08 4.92e-08 2.08e-07 1.13e-07 2.57e-07 erg/cm2
Peak flux Power-law 2.94e-01 1.94e-01 8.34e-02 4.92e-02 5.97e-01 6.21e-01 ph/cm2/s
Error 7.65e-02 4.30e-02 3.38e-02 3.65e-02 1.24e-01 1.33e-01 ph/cm2/s
Fluence Cutoff-PL 1.90e-07 3.19e-07 3.32e-07 2.99e-07 9.96e-07 1.14e-06 erg/cm2
Error 3.11e-08 3.56e-08 5.35e-08 3.37e-07 1.26e-07 3.74e-07 erg/cm2
Peak flux Cutoff-PL 2.70e-01 2.36e-01 6.67e-02 4.52e-03 5.78e-01 5.78e-01 ph/cm2/s
Error 8.79e-02 6.57e-02 4.31e-02 3.36e-02 1.24e-01 9.40e-02 ph/cm2/s
Fluence Band 1.88e-07 3.18e-07 3.32e-07 3.04e-07 9.94e-07 1.15e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.72e-01 2.37e-01 6.79e-02 1.16e-02 5.81e-01 5.88e-01 ph/cm2/s
Error -------- -------- -------- 3.40e-02 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.851 0.168 - - 8.84e-04 9.48e-05 50.020 57
CPL 1.321 0.682 57.0 -20.3 1.73e-03 1.78e-03 48.050 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 2.220 0.411 - - 3.57e-03 1.11e-03 49.050 57
CPL 0.435 2.577 31.7 21.2 4.74e-02 2.80e+00 46.900 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: 118.016000 sec.
T50 in the 50-300 keV band: 74.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.660 -1.904 126.756
T90 105.084 -0.372 104.712
T50 75.908 10.848 86.756
Peak 1.000 -1.804 -0.804
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
180.7756 24.9054 0.0156 12.3559 54.6010 0.7790792 12.391 TRIG_00721234
Foreground time interval of the image:
-1.904 35.797 (delta_t = 37.701 [sec])
Background time interval of the image:
-239.304 -1.904 (delta_t = 237.400 [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 -1.904 sec. to 126.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85059 ( -0.165187 0.17178 )
Norm@50keV : 8.83866E-04 ( -9.56799e-05 9.38865e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8775 for 57 degrees of freedom
# Null hypothesis probability = 7.322351e-01
Photon flux (15-150 keV) in 128.7 sec: 0.124266 ( -0.0112209 0.0112251 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04593e-06 ( -1.12331e-07 1.14268e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.904 sec. to 126.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32093 ( -0.747313 0.615843 )
Epeak [keV] : 57.0267 ( -16.4224 -57.0267 )
Norm@50keV : 1.73316E-03 ( -0.000884856 0.00268242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.05 using 59 PHA bins.
# Reduced chi-squared = 0.8579 for 56 degrees of freedom
# Null hypothesis probability = 7.662955e-01
Photon flux (15-150 keV) in 128.7 sec: 0.121446 ( -0.011716 0.011708 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.95534e-07 ( -1.23754e-07 1.28535e-07 ) ergs/cm2
Band function
Time interval is from -1.904 sec. to 126.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32159 ( -0.629487 0.753446 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 57.0434 ( -16.4127 -57.0434 )
Norm@50keV : 1.73131E-03 ( -0.00173131 0.00268538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.05 using 59 PHA bins.
# Reduced chi-squared = 0.8736 for 55 degrees of freedom
# Null hypothesis probability = 7.353236e-01
Photon flux (15-150 keV) in 128.7 sec: 0.122400 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94102e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6841 (-1.25914 1.40064)
R^2/D10^2 : 3.25571E-02 (-0.0111317 0.0171017)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.95 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.563708e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.207e-07 2.125e-08
25- 50 3.679e-07 4.189e-08
50-150 2.965e-07 6.918e-08
15-150 7.850e-07 9.479e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.2505 (-24.3679 42.0188)
Norm : 0.564347 (-0.070795 0.0848103)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.10 using 59 PHA bins.
# Reduced chi-squared = 0.8439 for 57 degrees of freedom
# Null hypothesis probability = 7.932438e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.895e-07 2.587e-08
25- 50 3.199e-07 3.436e-08
50-150 4.846e-07 1.950e-07
15-150 9.939e-07 2.186e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.30017 (-1.11902 1.5097)
R1^2/D10^2 : 0.879490 (-0.61897 2.75799)
kT2 [keV] : 16.3892 (-2.61268 3.95643)
R2^2/D10^2 : 7.76064E-03 (-0.00452813 0.00775077)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.87 using 59 PHA bins.
# Reduced chi-squared = 0.8339 for 55 degrees of freedom
# Null hypothesis probability = 8.050545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.998e-07 8.830e-08
25- 50 3.008e-07 9.884e-08
50-150 4.499e-07 1.583e-07
15-150 9.504e-07 3.078e-07
Peak spectrum fit
Power-law model
Time interval is from -1.804 sec. to -0.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21988 ( -0.378809 0.443758 )
Norm@50keV : 3.56625E-03 ( -0.00112535 0.00109658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8605 for 57 degrees of freedom
# Null hypothesis probability = 7.640341e-01
Photon flux (15-150 keV) in 1 sec: 0.596644 ( -0.124444 0.124525 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36279e-08 ( -8.80161e-09 9.35104e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.804 sec. to -0.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.435008 ( -3.21416 1.93951 )
Epeak [keV] : 31.7225 ( -28.3576 14.0582 )
Norm@50keV : 4.74254E-02 ( -0.0509495 5.54744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8376 for 56 degrees of freedom
# Null hypothesis probability = 8.014988e-01
Photon flux (15-150 keV) in 1 sec: 0.577712 ( -0.12285 0.124424 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91347e-08 ( -7.5005e-09 1.00038e-08 ) ergs/cm2
Band function
Time interval is from -1.804 sec. to -0.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.421075 ( -5.75986 3.14286 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 31.8297 ( -9.32781 12.501 )
Norm@50keV : 4.83949E-02 ( -0.0489798 5219.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8528 for 55 degrees of freedom
# Null hypothesis probability = 7.730869e-01
Photon flux (15-150 keV) in 1 sec: 0.581247 ( ) 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] : 8.53525 (-1.66157 1.96518)
R^2/D10^2 : 0.538893 (-0.30194 0.713159)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.940834e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.418e-09 2.659e-09
25- 50 1.448e-08 6.232e-09
50-150 4.685e-09 2.913e-09
15-150 2.659e-08 9.430e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.9054 (-17.1188 36.9112)
Norm : 3.76470 (-1.15946 1.82274)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8306 for 57 degrees of freedom
# Null hypothesis probability = 8.153307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.840e-09 2.470e-09
25- 50 1.198e-08 4.411e-09
50-150 9.988e-09 6.509e-09
15-150 3.081e-08 1.080e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.87967 (-2.84785 193.654)
R1^2/D10^2 : 20.1399 (-20.7237 -20.7237)
kT2 [keV] : 9.80824 (-2.38291 -9.79574)
R2^2/D10^2 : 0.276336 (-0.277661 0.614926)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 55 degrees of freedom
# Null hypothesis probability = 7.897279e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.283e-09 3.975e-09
25- 50 1.337e-08 7.790e-09
50-150 6.416e-09 4.228e-09
15-150 2.807e-08 1.550e-08
Plot creation:
Tue Nov 8 13:55:04 EST 2016