batgrbproduct analysis for trigger=928924
batgrbproduct Analysis for Trigger=928924
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): Sat Oct 12 07:43:49 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger928924/GCN5_download_cron
======================================================================
Trigger: 00928924 Segment: 000
BAT Trigger Time: 592461380.16 [s; MET]
Trigger Stop: 592461380.672 [s; MET]
UTC: 2019-10-11T04:35:56.431400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 44.7235634192283 Dec: -27.8448241616054 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.04
Image Trigger?: NO
Rate S/N Ratio: 21.0713075057055 [ if not an image trigger ]
Image S/N Ratio: 11.04
Flight Position: [ source = BAT ]
RA: 44.7235634192283 Dec: -27.8448241616054 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.7291374652994 Dec: -27.8536944192895 [deg; J2000]
{ 02h 58m 55.0s , -27d 51' 13.3" }
+/- 1.45322315011244 [arcmin] (estimated 90% radius based on SNR)
+/- 0.807152641895971 [arcmin] (formal 1-sigma fit error)
SNR: 17.832617051307
Angular difference between Flight and Ground position is 0.608848 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 7.36800003051758 +/- 0.950286355356625
Measured from: 0.0280001163482666
to: 7.39600014686584 [s; relative to TRIGTIME]
T50: 3.37600004673004 +/- 1.67248793347714
Measured from: 0.54800009727478
to: 3.92400014400482 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.175999999046326
to: 1.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.20799994468689
to: 8.0440000295639 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.238695 0.233701 0.134793 0.016905
0.018309 0.018972 0.016334 0.013981 [error]
Peak 0.070798 0.089979 0.059671 0.003592
0.007108 0.007886 0.006415 0.005182 [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 6.96e-08 9.79e-08 1.02e-07 1.95e-07 3.31e-07 4.65e-07 erg/cm2
Error 9.15e-09 8.72e-09 1.59e-08 6.13e-08 3.61e-08 7.78e-08 erg/cm2
Peak flux Power-law 6.86e-01 6.17e-01 3.83e-01 3.61e-01 1.84e+00 2.05e+00 ph/cm2/s
Error 1.03e-01 6.08e-02 5.34e-02 9.81e-02 1.80e-01 2.03e-01 ph/cm2/s
Fluence Cutoff-PL 6.89e-08 9.93e-08 1.02e-07 1.57e-07 3.27e-07 4.27e-07 erg/cm2
Error 9.92e-09 1.08e-08 1.65e-08 1.03e-07 4.11e-08 1.18e-07 erg/cm2
Peak flux Cutoff-PL 6.40e-01 6.56e-01 3.95e-01 1.94e-01 1.81e+00 1.88e+00 ph/cm2/s
Error 1.18e-01 7.84e-02 5.87e-02 1.58e-01 1.83e-01 2.43e-01 ph/cm2/s
Fluence Band 6.90e-08 9.89e-08 1.02e-07 1.92e-07 3.32e-07 4.64e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 6.49e-01 6.49e-01 3.94e-01 2.18e-01 1.82e+00 1.91e+00 ph/cm2/s
Error -------- -------- 5.82e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.941 0.175 - - 4.36e-03 4.88e-04 50.760 57
CPL 1.832 0.564 65.9 0.0 5.03e-03 0.00e+00 50.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.689 0.168 - - 1.39e-02 1.50e-03 56.200 57
CPL 1.163 0.671 74.0 -26.3 2.67e-02 2.67e-02 54.300 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: 2.368000 sec.
T50 in the 50-300 keV band: 1.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.252 -0.208 8.044
T90 7.368 0.028 7.396
T50 3.376 0.548 3.924
Peak 1.000 0.176 1.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.7291 -27.8537 0.0107 18.9 -27.6 0.6418 17.8 TRIG_00928924
------------------------------------------
Foreground time interval of the image:
-0.208 8.044 (delta_t = 8.252 [sec])
Background time interval of the image:
-203.859 -0.208 (delta_t = 203.651 [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 -0.208 sec. to 8.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94103 ( -0.171232 0.178936 )
Norm@50keV : 4.36119E-03 ( -0.000493852 0.000482643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.76 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 57 degrees of freedom
# Null hypothesis probability = 7.067642e-01
Photon flux (15-150 keV) in 8.252 sec: 0.637065 ( -0.0567414 0.0567632 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31105e-07 ( -3.57601e-08 3.64461e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 8.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83177 ( -0.722151 0.406566 )
Epeak [keV] : 65.9254 ( )
Norm@50keV : 5.03301E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.68 using 59 PHA bins.
# Reduced chi-squared = 0.9050 for 56 degrees of freedom
# Null hypothesis probability = 6.758430e-01
Photon flux (15-150 keV) in 8.252 sec: 0.633853 ( -0.059552 0.058896 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27166e-07 ( -4.25011e-08 3.96509e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 8.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67683 ( 1.5478 1.5478 )
beta : -2.00479 ( 2.01027 0.23725 )
Epeak [keV] : 42.3041 ( -38.2587 -38.2587 )
Norm@50keV : 6.41636E-03 ( -0.00248019 2684.53 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.64 using 59 PHA bins.
# Reduced chi-squared = 0.9207 for 55 degrees of freedom
# Null hypothesis probability = 6.417241e-01
Photon flux (15-150 keV) in 8.252 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31588e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1868 (-1.14109 1.29692)
R^2/D10^2 : 0.270134 (-0.0983946 0.154602)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.58 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 57 degrees of freedom
# Null hypothesis probability = 1.500655e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.740e-08 7.353e-09
25- 50 1.209e-07 1.320e-08
50-150 6.658e-08 1.504e-08
15-150 2.349e-07 2.703e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.4271 (-20.1298 33.5057)
Norm : 3.02642 (-0.414381 0.507788)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9156 for 57 degrees of freedom
# Null hypothesis probability = 6.557739e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.453e-08 7.555e-09
25- 50 1.047e-07 9.944e-09
50-150 1.419e-07 4.671e-08
15-150 3.111e-07 4.369e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29555 (-1.5357 1.78201)
R1^2/D10^2 : 2.30591 (-1.45798 6.97661)
kT2 [keV] : 19.2345 (-4.93617 10.8969)
R2^2/D10^2 : 1.83884E-02 (-0.0146587 0.0391636)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.66 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 55 degrees of freedom
# Null hypothesis probability = 5.647251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.890e-08 2.785e-08
25- 50 9.675e-08 3.088e-08
50-150 1.476e-07 8.021e-08
15-150 3.132e-07 1.286e-07
Peak spectrum fit
Power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68930 ( -0.165573 0.17077 )
Norm@50keV : 1.38936E-02 ( -0.0015101 0.00148822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 0.9860 for 57 degrees of freedom
# Null hypothesis probability = 5.049717e-01
Photon flux (15-150 keV) in 1 sec: 1.83838 ( -0.179707 0.179761 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2875e-07 ( -1.46531e-08 1.48302e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16295 ( -0.74271 0.598814 )
Epeak [keV] : 73.9956 ( -21.4111 -73.9956 )
Norm@50keV : 2.67449E-02 ( -0.0140099 0.0393281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9696 for 56 degrees of freedom
# Null hypothesis probability = 5.395321e-01
Photon flux (15-150 keV) in 1 sec: 1.80873 ( -0.18345 0.18335 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23748e-07 ( -1.5692e-08 1.6023e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22989 ( -0.474549 0.749157 )
beta : -9.36896 ( 9.37142 19.3714 )
Epeak [keV] : 80.1342 ( -25.8883 34.6186 )
Norm@50keV : 2.43714E-02 ( -0.0112718 0.0175101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9881 for 55 degrees of freedom
# Null hypothesis probability = 4.996220e-01
Photon flux (15-150 keV) in 1 sec: 1.81627 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25271e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9050 (-1.52972 1.72586)
R^2/D10^2 : 0.352040 (-0.128557 0.203056)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.86 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.459604e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.244e-08 2.154e-09
25- 50 4.249e-08 5.335e-09
50-150 4.454e-08 9.395e-09
15-150 9.947e-08 1.260e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.160 (-44.8073 -131.476)
Norm : 7.68742 (-0.862521 1.07398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9551 for 57 degrees of freedom
# Null hypothesis probability = 5.716129e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.991e-08 2.585e-09
25- 50 3.628e-08 7.540e-09
50-150 6.824e-08 3.183e-08
15-150 1.244e-07 4.357e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57383 (-1.60012 2.00396)
R1^2/D10^2 : 4.38254 (-2.86182 10.1481)
kT2 [keV] : 20.0190 (-3.88562 6.93284)
R2^2/D10^2 : 5.66127E-02 (-0.0389814 0.0473955)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.16 using 59 PHA bins.
# Reduced chi-squared = 0.9666 for 55 degrees of freedom
# Null hypothesis probability = 5.450981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.052e-08 1.036e-08
25- 50 3.545e-08 1.423e-08
50-150 6.566e-08 3.024e-08
15-150 1.216e-07 4.563e-08
Plot creation:
Sat Oct 12 07:48:15 EDT 2019