batgrbproduct analysis for trigger=916733
batgrbproduct Analysis for Trigger=916733
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): Sun Jul 28 20:47:21 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger916733/GCN5_download_cron
======================================================================
Trigger: 00916733 Segment: 000
BAT Trigger Time: 585951520.332 [s; MET]
Trigger Stop: 585951520.396 [s; MET]
UTC: 2019-07-27T20:18:17.019680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 126.480723836389 Dec: -13.2677573048208 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: NO
Rate S/N Ratio: 11.7046999107196 [ if not an image trigger ]
Image S/N Ratio: 7.74
Flight Position: [ source = BAT ]
RA: 126.480723836389 Dec: -13.2677573048208 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.499718679966 Dec: -13.2719070320775 [deg; J2000]
{ 08h 25m 59.9s , -13d 16' 18.9" }
+/- 0.662243231489821 [arcmin] (estimated 90% radius based on SNR)
+/- 0.178560241536079 [arcmin] (formal 1-sigma fit error)
SNR: 54.8034154477161
Angular difference between Flight and Ground position is 1.136861 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 40.135999917984 +/- 1.40014285605322
Measured from: -17.7519998550415
to: 22.3840000629425 [s; relative to TRIGTIME]
T50: 12.9119999408722 +/- 0.189736697307391
Measured from: 0.648000121116638
to: 13.5600000619888 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.13199996948242
to: 2.13199996948242 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.3000000715256
to: 44.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.077269 9.991494 8.101165 2.347971
0.096317 0.107706 0.098879 0.074823 [error]
Peak 0.542595 0.945873 0.874660 0.266812
0.020584 0.025930 0.026714 0.020414 [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 2.17e-06 4.20e-06 6.31e-06 2.05e-05 1.78e-05 3.32e-05 erg/cm2
Error 8.19e-08 9.11e-08 1.16e-07 9.17e-07 2.95e-07 9.45e-07 erg/cm2
Peak flux Power-law 5.51e+00 6.63e+00 5.77e+00 8.60e+00 2.09e+01 2.65e+01 ph/cm2/s
Error 3.54e-01 2.53e-01 2.21e-01 7.14e-01 6.96e-01 9.20e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-06 4.20e-06 6.32e-06 2.04e-05 1.78e-05 3.30e-05 erg/cm2
Error 1.03e-07 9.03e-08 9.14e-08 1.61e-06 2.92e-07 1.75e-06 erg/cm2
Peak flux Cutoff-PL 5.29e+00 6.70e+00 5.87e+00 7.13e+00 2.07e+01 2.50e+01 ph/cm2/s
Error 4.39e-01 2.72e-01 2.58e-01 1.64e+00 7.30e-01 1.79e+00 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 1.413 0.032 - - 2.80e-02 4.71e-04 40.160 57
CPL 1.410 0.033 9999.4 0.0 2.81e-02 1.84e-03 40.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.200 0.059 - - 1.78e-01 5.76e-03 57.560 57
CPL 1.031 0.209 314.5 -83.4 2.14e-01 4.72e-02 55.750 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: 36.864000 sec.
T50 in the 50-300 keV band: 12.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 65.772 -21.300 44.472
T90 40.136 -17.752 22.384
T50 12.912 0.648 13.560
Peak 1.000 1.132 2.132
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.4997 -13.2719 0.0035 25.5 -112.3 27.8892 54.8 TRIG_00916733
------------------------------------------
Foreground time interval of the image:
-12.231 44.472 (delta_t = 56.703 [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 -21.300 sec. to 44.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41272 ( -0.0325472 0.0324458 )
Norm@50keV : 2.80040E-02 ( -0.000470843 0.000470212 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.16 using 59 PHA bins.
# Reduced chi-squared = 0.7045 for 57 degrees of freedom
# Null hypothesis probability = 9.556967e-01
Photon flux (15-150 keV) in 65.77 sec: 3.42035 ( -0.0678422 0.0681108 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77513e-05 ( -2.94912e-07 2.95017e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.300 sec. to 44.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40987 ( -0.0332159 0.0322468 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.80871E-02 ( -0.000464295 0.00321965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.17 using 59 PHA bins.
# Reduced chi-squared = 0.7173 for 56 degrees of freedom
# Null hypothesis probability = 9.453187e-01
Photon flux (15-150 keV) in 65.77 sec: 3.41919 ( -0.06889 0.06589 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77539e-05 ( -2.91295e-07 2.934e-07 ) ergs/cm2
Band function
Time interval is from -21.300 sec. to 44.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.745724 ( 0.939088 5.81608 )
beta : -1.42000 ( -0.0398833 0.0358649 )
Epeak [keV] : 52.2589 ( -52.1664 216.875 )
Norm@50keV : 8.12893E-02 ( -0.0819765 2.06326e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.42 using 59 PHA bins.
# Reduced chi-squared = 0.7166 for 55 degrees of freedom
# Null hypothesis probability = 9.440931e-01
Photon flux (15-150 keV) in 65.77 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] : 19.7776 ( )
R^2/D10^2 : 0.145759 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 834.92 using 59 PHA bins.
# Reduced chi-squared = 14.648 for 57 degrees of freedom
# Null hypothesis probability = 1.090511e-138
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.260e-07 2.565e-08
25- 50 3.590e-06 8.879e-08
50-150 1.039e-05 2.565e-07
15-150 1.471e-05 2.795e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 14.4687 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.30 using 59 PHA bins.
# Reduced chi-squared = 2.8123 for 57 degrees of freedom
# Null hypothesis probability = 9.298846e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.370e-06 4.571e-08
25- 50 4.558e-06 8.320e-08
50-150 9.997e-06 1.973e-07
15-150 1.692e-05 3.486e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.79397 (-0.482082 0.507723)
R1^2/D10^2 : 2.31964 (-0.464381 0.607758)
kT2 [keV] : 31.9103 (-1.78446 2.10613)
R2^2/D10^2 : 2.43087E-02 (-0.0047458 0.00536442)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.57 using 59 PHA bins.
# Reduced chi-squared = 0.7557 for 55 degrees of freedom
# Null hypothesis probability = 9.095780e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.888e-06 1.332e-07
25- 50 4.295e-06 1.509e-07
50-150 1.151e-05 3.617e-07
15-150 1.769e-05 4.374e-07
Peak spectrum fit
Power-law model
Time interval is from 1.132 sec. to 2.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20041 ( -0.0588989 0.0588439 )
Norm@50keV : 0.178284 ( -0.00576387 0.00576379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.544036e-01
Photon flux (15-150 keV) in 1 sec: 20.9282 ( -0.695629 0.696137 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80855e-06 ( -6.60349e-08 6.62348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.132 sec. to 2.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03067 ( -0.22638 0.192137 )
Epeak [keV] : 314.531 ( -147.802 -314.532 )
Norm@50keV : 0.213675 ( -0.0379963 0.0563284 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 0.9956 for 56 degrees of freedom
# Null hypothesis probability = 4.841918e-01
Photon flux (15-150 keV) in 1 sec: 20.7469 ( -0.7298 0.7301 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79024e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.132 sec. to 2.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.712452 ( -2.60051 -1.83322 )
beta : -1.27713 ( -0.111507 0.0779105 )
Epeak [keV] : 43.2073 ( -15.6908 55.3326 )
Norm@50keV : 3.31074 ( -3.32395 3068.82 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.99 using 59 PHA bins.
# Reduced chi-squared = 0.9271 for 55 degrees of freedom
# Null hypothesis probability = 6.285837e-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] : 19.0355 ( )
R^2/D10^2 : 1.11659 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 249.63 using 59 PHA bins.
# Reduced chi-squared = 4.3795 for 57 degrees of freedom
# Null hypothesis probability = 6.156077e-26
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.947e-08 4.925e-09
25- 50 3.828e-07 1.755e-08
50-150 1.020e-06 6.035e-08
15-150 1.482e-06 6.700e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 86.2586 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.55 using 59 PHA bins.
# Reduced chi-squared = 2.7114 for 57 degrees of freedom
# Null hypothesis probability = 6.154292e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.148e-07 7.050e-09
25- 50 4.132e-07 1.400e-08
50-150 9.062e-07 3.050e-08
15-150 1.534e-06 5.250e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.05439 (-0.825294 0.905392)
R1^2/D10^2 : 11.3684 (-3.21905 4.78574)
kT2 [keV] : 33.6031 (-3.61691 4.94651)
R2^2/D10^2 : 0.149035 (-0.0520339 0.0670241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7903 for 55 degrees of freedom
# Null hypothesis probability = 8.692236e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.585e-07 1.610e-08
25- 50 3.952e-07 3.085e-08
50-150 1.258e-06 1.325e-07
15-150 1.811e-06 1.715e-07
Plot creation:
Sun Jul 28 20:51:33 EDT 2019