batgrbproduct analysis for trigger=745966
batgrbproduct Analysis for Trigger=745966
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): Fri Apr 7 11:26:34 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger745966/GCN5_download_cron
======================================================================
Trigger: 00745966 Segment: 000
BAT Trigger Time: 513174560 [s; MET]
Trigger Stop: 513174752 [s; MET]
UTC: 2017-04-06T12:29:01.132380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.037560306037 Dec: -2.43867721564144 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.83
Flight Position: [ source = BAT ]
RA: 282.037560306037 Dec: -2.43867721564144 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.082316035675 Dec: -2.44455067672784 [deg; J2000]
{ 18h 48m 19.8s , -02d 26' 40.4" }
+/- 3.04318155190556 [arcmin] (estimated 90% radius based on SNR)
+/- 1.43547470135469 [arcmin] (formal 1-sigma fit error)
SNR: 6.20368881545132
Angular difference between Flight and Ground position is 2.705952 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 595.867999970913 +/- 452.828621958643
Measured from: 270.992000102997
to: 866.86000007391 [s; relative to TRIGTIME]
T50: 489.251999914646 +/- 433.708101625583
Measured from: 359.268000125885
to: 848.520000040531 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 861.884000003338
to: 862.884000003338 [s; relative to TRIGTIME]
Total Fluence
Measured from: -66.8840000033379
to: 886.339999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.540806 2.735969 0.735159 0.365751
0.202138 0.197551 0.165133 0.140730 [error]
Peak 0.019986 0.018650 0.008548 0.005760
0.006683 0.006506 0.005553 0.004712 [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 7.87e-07 9.33e-07 7.97e-07 1.16e-06 2.93e-06 3.68e-06 erg/cm2
Error 9.35e-08 8.95e-08 1.40e-07 3.86e-07 3.28e-07 5.69e-07 erg/cm2
Peak flux Power-law 1.70e-01 1.21e-01 5.66e-02 3.72e-02 3.65e-01 3.84e-01 ph/cm2/s
Error 8.80e-02 5.10e-02 4.25e-02 6.03e-02 1.45e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 7.10e-07 1.13e-06 5.73e-07 5.95e-08 2.47e-06 2.47e-06 erg/cm2
Error 1.07e-07 1.32e-07 1.93e-07 1.14e-07 3.13e-07 3.29e-07 erg/cm2
Peak flux Cutoff-PL 1.71e-01 1.20e-01 5.55e-02 3.54e-02 3.65e-01 3.83e-01 ph/cm2/s
Error 6.63e-02 6.39e-02 -------- 5.99e-02 1.44e-01 1.59e-01 ph/cm2/s
Fluence Band 8.74e-07 1.30e-06 5.91e-07 4.94e-08 2.82e-06 2.82e-06 erg/cm2
Error 2.60e-07 3.48e-07 4.05e-07 -------- 7.13e-07 -------- erg/cm2
Peak flux Band 2.97e-02 2.50e-02 6.45e-03 -------- 6.16e-02 6.12e-02 ph/cm2/s
Error 9.37e-03 6.56e-03 3.82e-03 -------- 1.26e-02 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.226 0.177 - - 3.26e-04 4.22e-05 56.560 57
CPL 0.184 1.179 32.3 5.3 6.10e-03 2.06e-02 43.420 56
The chi2 of BB fit is 48.21 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 2.093 0.889 - - 2.33e-03 1.82e-03 63.220 57
CPL 1.918 0.000 21.3 0.0 2.91e-03 0.00e+00 63.260 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 953.224 -66.884 886.340
T90 595.868 270.992 866.860
T50 489.252 359.268 848.520
Peak 1.000 861.884 862.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.0823 -2.4446 0.0311 3.0 -142.1 1.4774 6.2 TRIG_00745966
------------------------------------------
Foreground time interval of the image:
-14.499 203.101 (delta_t = 217.600 [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
Multiple GTIs in the spectrum
tstart tstop
-66.884000 -56.898600
-56.000000 658.430000
660.000000 886.340000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22626 ( -0.171852 0.181412 )
Norm@50keV : 3.26352E-04 ( -4.2464e-05 4.20027e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 0.9923 for 57 degrees of freedom
# Null hypothesis probability = 4.915357e-01
Photon flux (15-150 keV) in 950.8 sec: 5.47855E-02 ( -0.00500933 0.00500949 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92862e-06 ( -3.24041e-07 3.32252e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-66.884000 -56.898600
-56.000000 658.430000
660.000000 886.340000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.183992 ( -1.3063 1.05213 )
Epeak [keV] : 32.2861 ( -5.96675 4.55673 )
Norm@50keV : 6.09581E-03 ( -0.0061533 0.0350432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7754 for 56 degrees of freedom
# Null hypothesis probability = 8.900594e-01
Photon flux (15-150 keV) in 950.8 sec: 5.16860E-02 ( -0.0050795 0.0051107 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46971e-06 ( -2.92514e-07 3.32856e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-66.884000 -56.898600
-56.000000 658.430000
660.000000 886.340000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.48524E-02 ( -1.13653 1.76099 )
beta : -3.61754 ( 3.67659 0.992614 )
Epeak [keV] : 31.8841 ( -4.81941 4.69511 )
Norm@50keV : 7.77140E-03 ( -0.00495301 0.119547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.26 using 59 PHA bins.
# Reduced chi-squared = 0.7866 for 55 degrees of freedom
# Null hypothesis probability = 8.740373e-01
Photon flux (15-150 keV) in 950.8 sec: 6.15657E-02 ( 6.93843 -0.0130753 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82371e-06 ( -2.81706e-06 -6.63307e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.54619 (-0.748988 0.819218)
R^2/D10^2 : 4.76524E-02 (-0.0146793 0.0212109)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8457 for 57 degrees of freedom
# Null hypothesis probability = 7.901187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.257e-07 8.676e-08
25- 50 1.224e-06 1.341e-07
50-150 3.977e-07 1.134e-07
15-150 2.248e-06 2.558e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.6107 (-8.55381 12.0958)
Norm : 0.343982 (-0.0540912 0.0653466)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.68 using 59 PHA bins.
# Reduced chi-squared = 0.8189 for 57 degrees of freedom
# Null hypothesis probability = 8.337182e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.664e-07 9.313e-08
25- 50 1.035e-06 1.114e-07
50-150 8.573e-07 2.321e-07
15-150 2.659e-06 3.689e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.94357 (-2.68699 -3.94326)
R1^2/D10^2 : 0.369536 (-0.324185 799.065)
kT2 [keV] : 10.0671 (-1.66243 -10.0668)
R2^2/D10^2 : 2.10001E-02 (-0.0209923 0.0282863)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7904 for 55 degrees of freedom
# Null hypothesis probability = 8.691010e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.112e-07 3.680e-07
25- 50 1.140e-06 5.942e-07
50-150 5.528e-07 3.358e-07
15-150 2.404e-06 1.223e-06
Peak spectrum fit
Power-law model
Time interval is from 861.884 sec. to 862.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09255 ( -0.765134 1.01232 )
Norm@50keV : 2.32704E-03 ( -0.00232704 0.00130585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.660783e-01
Photon flux (15-150 keV) in 1 sec: 0.364762 ( -0.145147 0.145272 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16054e-08 ( -1.07095e-08 1.20992e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 861.884 sec. to 862.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91825 ( )
Epeak [keV] : 21.2777 ( )
Norm@50keV : 2.90858E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.354040e-01
Photon flux (15-150 keV) in 1 sec: 0.364531 ( -0.144603 0.144021 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15842e-08 ( -1.15683e-08 1.1904e-08 ) ergs/cm2
Band function
Time interval is from 861.884 sec. to 862.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88600 ( -4.886 -4.886 )
beta : -2.25308 ( -2.44891 0.887415 )
Epeak [keV] : 20.8230 ( -20.823 74.606 )
Norm@50keV : 1155.59 ( -456.078 8.83003e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 55 degrees of freedom
# Null hypothesis probability = 2.114864e-01
Photon flux (15-150 keV) in 1 sec: 6.15657E-02 ( 6.93843 -0.0130753 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96983e-09 ( -2.96283e-09 -6.9763e-10 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.68288 (-3.09899 5.143)
R^2/D10^2 : 0.468452 (-0.467919 3.35271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.54 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.299750e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.844e-09 3.054e-09
25- 50 7.893e-09 5.305e-09
50-150 1.811e-09 1.430e-09
15-150 1.455e-08 9.730e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.1061 (-50.097 -50.097)
Norm : 2.06284 (-1.08048 3.36456)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.47 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.590928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.046e-09 3.184e-09
25- 50 7.253e-09 4.703e-09
50-150 7.056e-09 6.105e-09
15-150 1.936e-08 1.311e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50697 (-6.44149 4.48644)
R1^2/D10^2 : 0.829405 (-0.82507 -0.82507)
kT2 [keV] : 62.6383 (-63.2796 -63.2796)
R2^2/D10^2 : 2.74234E-04 (-0.000273727 0.0907253)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.80 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Null hypothesis probability = 2.192236e-01
# Null hypothesis probability = 2.195299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.306e-09 3.172e-09
25- 50 6.869e-09 4.434e-09
50-150 1.188e-08 6.165e-09
15-150 2.405e-08 1.140e-08
Plot creation:
Fri Apr 7 11:43:39 EDT 2017