batgrbproduct Analysis for Trigger=678929
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): Sun Mar 13 15:58:12 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger678929/batgroup_hand_proc
======================================================================
Trigger: 00678929 Segment: 000
BAT Trigger Time: 479529451.776 [s; MET]
Trigger Stop: 479529478.656 [s; MET]
UTC: 2016-03-13T02:37:15.804900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 183.787873774764 Dec: 57.2928358615757 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.71
Image Trigger?: NO
Rate S/N Ratio: 9.89949493661167 [ if not an image trigger ]
Image S/N Ratio: 8.71
Flight Position: [ source = BAT ]
RA: 183.787873774764 Dec: 57.2928358615757 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 183.821034698105 Dec: 57.2777930753815 [deg; J2000]
{ 12h 15m 17.0s , +57d 16' 40.1" }
+/- 2.00408669935266 [arcmin] (estimated 90% radius based on SNR)
+/- 0.922695431527082 [arcmin] (formal 1-sigma fit error)
SNR: 11.2670205408491
Angular difference between Flight and Ground position is 1.403903 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 42.62399995327 +/- 6.41100459014352
Measured from: -2.5440000295639
to: 40.0799999237061 [s; relative to TRIGTIME]
T50: 20.0559999346733 +/- 5.85556318242348
Measured from: 8.43199998140335
to: 28.4879999160767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.7919999957085
to: 25.7919999957085 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.60400003194809
to: 44.6559999585152 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.269444 0.278433 0.296775 0.080835
0.039387 0.039542 0.034375 0.028836 [error]
Peak 0.017002 0.013469 0.011986 0.008352
0.005677 0.005707 0.004869 0.004146 [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 6.62e-08 1.33e-07 2.07e-07 7.09e-07 5.76e-07 1.11e-06 erg/cm2
Error 1.56e-08 1.84e-08 3.37e-08 2.61e-07 8.28e-08 2.83e-07 erg/cm2
Peak flux Power-law 1.54e-01 1.25e-01 6.89e-02 5.57e-02 3.73e-01 4.04e-01 ph/cm2/s
Error 7.98e-02 4.40e-02 4.07e-02 7.38e-02 1.31e-01 1.47e-01 ph/cm2/s
Fluence Cutoff-PL 6.52e-08 1.33e-07 2.08e-07 6.47e-07 5.77e-07 1.05e-06 erg/cm2
Error 1.29e-08 1.93e-08 3.54e-08 3.26e-07 8.38e-08 3.17e-07 erg/cm2
Peak flux Cutoff-PL 1.56e-01 1.25e-01 6.72e-02 5.17e-02 3.73e-01 4.02e-01 ph/cm2/s
Error 8.13e-02 3.67e-02 4.13e-02 7.34e-02 1.31e-01 1.47e-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 1.360 0.233 - - 1.18e-03 1.50e-04 50.530 57
CPL 1.365 0.235 9999.4 0.0 1.18e-03 9.03e-04 50.540 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 1.861 0.752 - - 2.64e-03 1.20e-03 59.830 57
CPL 2.130 1.925 53.4 0.0 1.90e-03 0.00e+00 59.760 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: 33.472000 sec.
T50 in the 50-300 keV band: 20.736000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 50.260 -5.604 44.656
T90 42.624 -2.544 40.080
T50 20.056 8.432 28.488
Peak 1.000 24.792 25.792
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
183.8210 57.2778 0.0171 17.9561 -102.9737 0.9048962 11.267 TRIG_00678929
Foreground time interval of the image:
-5.604 44.656 (delta_t = 50.260 [sec])
Background time interval of the image:
-239.275 -5.604 (delta_t = 233.671 [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 -5.604 sec. to 44.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36032 ( -0.233124 0.233464 )
Norm@50keV : 1.17635E-03 ( -0.000150458 0.000150023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.53 using 59 PHA bins.
# Reduced chi-squared = 0.8865 for 57 degrees of freedom
# Null hypothesis probability = 7.147165e-01
Photon flux (15-150 keV) in 50.26 sec: 0.142021 ( -0.0184808 0.0185328 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76125e-07 ( -8.23334e-08 8.3218e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.604 sec. to 44.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36459 ( -0.239704 0.230473 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.17857E-03 ( -0.00015032 0.001656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.54 using 59 PHA bins.
# Reduced chi-squared = 0.9025 for 56 degrees of freedom
# Null hypothesis probability = 6.809506e-01
Photon flux (15-150 keV) in 50.26 sec: 0.142029 ( -0.0186 0.018326 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77141e-07 ( -8.5917e-08 8.1763e-08 ) ergs/cm2
Band function
Time interval is from -5.604 sec. to 44.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12289 ( 1.12289 1.12289 )
beta : -1.36031 ( -3.01007 0.233296 )
Epeak [keV] : 30.3111 ( -30.3093 -30.3093 )
Norm@50keV : 2.29088E-03 ( -0.00104304 0.177982 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.53 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 55 degrees of freedom
# Null hypothesis probability = 6.458114e-01
Photon flux (15-150 keV) in 50.26 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] : 18.0815 (-2.94893 3.67433)
R^2/D10^2 : 8.61784E-03 (-0.00397107 0.00712577)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.35 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.640029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.831e-08 7.820e-09
25- 50 1.314e-07 2.897e-08
50-150 3.121e-07 8.421e-08
15-150 4.718e-07 9.054e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-54.8242 -200)
Norm : 0.585592 (-0.0746764 0.0746764)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9333 for 57 degrees of freedom
# Null hypothesis probability = 6.184425e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.329e-08 4.167e-08
25- 50 1.410e-07 7.836e-08
50-150 3.092e-07 1.728e-07
15-150 5.235e-07 2.950e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.68403 (-2.014 3.12992)
R1^2/D10^2 : 0.619059 (-0.533 9.99123)
kT2 [keV] : 24.5881 (-5.22363 11.0181)
R2^2/D10^2 : 2.78771E-03 (-0.00197466 0.00372548)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.88 using 59 PHA bins.
# Reduced chi-squared = 0.9069 for 55 degrees of freedom
# Null hypothesis probability = 6.700713e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.269e-08 3.851e-08
25- 50 1.155e-07 4.095e-08
50-150 3.761e-07 1.451e-07
15-150 5.643e-07 2.198e-07
Peak spectrum fit
Power-law model
Time interval is from 24.792 sec. to 25.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86123 ( -0.674028 0.829129 )
Norm@50keV : 2.64016E-03 ( -0.00126768 0.00113047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.83 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 57 degrees of freedom
# Null hypothesis probability = 3.732671e-01
Photon flux (15-150 keV) in 1 sec: 0.372808 ( -0.131019 0.131027 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42726e-08 ( -1.04588e-08 1.11972e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.792 sec. to 25.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13016 ( -3.13324 0.715786 )
Epeak [keV] : 53.3775 ( )
Norm@50keV : 1.89655E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.76 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.409135e-01
Photon flux (15-150 keV) in 1 sec: 0.373046 ( -0.131443 0.130667 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44978e-08 ( -1.16898e-08 1.07956e-08 ) ergs/cm2
Band function
Time interval is from 24.792 sec. to 25.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48635 ( 1.48975 1.48975 )
beta : -1.85069 ( 1.86108 0.673354 )
Epeak [keV] : 17.5559 ( -16.777 -16.777 )
Norm@50keV : 6.27968E-03 ( -0.00641351 4.73182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.83 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.045902e-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] : 10.9641 (-4.98579 7.76833)
R^2/D10^2 : 0.121102 (-0.118928 1.0333)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.713872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.040e-09 1.963e-09
25- 50 8.559e-09 5.475e-09
50-150 5.797e-09 4.574e-09
15-150 1.740e-08 1.126e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.9668 (-92.9583 -92.9583)
Norm : 1.66805 (-0.679626 1.50879)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.611973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.356e-09 2.709e-09
25- 50 7.419e-09 4.681e-09
50-150 1.152e-08 9.855e-09
15-150 2.330e-08 1.658e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.92479 (-3.74622 8.82431)
R1^2/D10^2 : 4.76437 (-4.67385 -4.76438)
kT2 [keV] : 17.9203 (-8.84847 -17.9203)
R2^2/D10^2 : 1.64091E-02 (-0.0158721 0.229882)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.012426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.006e-09 3.064e-09
25- 50 6.220e-09 3.500e-09
50-150 1.135e-08 8.020e-09
15-150 2.258e-08 1.388e-08
Plot creation:
Sun Mar 13 16:11:08 EDT 2016