batgrbproduct analysis for trigger=920783
batgrbproduct Analysis for Trigger=920783
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): Mon Aug 19 17:22:15 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger920783/batgroup_hand_proc
======================================================================
Trigger: 00920783 Segment: 000
BAT Trigger Time: 587659368 [s; MET]
Trigger Stop: 587659448 [s; MET]
UTC: 2019-08-16T14:42:24.578600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 341.193592693739 Dec: -29.7399634001357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.26
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.26
Flight Position: [ source = BAT ]
RA: 341.193592693739 Dec: -29.7399634001357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 341.183297779946 Dec: -29.7451493446751 [deg; J2000]
{ 22h 44m 44.0s , -29d 44' 42.5" }
+/- 1.66804658683334 [arcmin] (estimated 90% radius based on SNR)
+/- 0.545779011437771 [arcmin] (formal 1-sigma fit error)
SNR: 14.6446207314923
Angular difference between Flight and Ground position is 0.620048 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 374.991999983788 +/- 92.8942920923842
Measured from: -117.583999991417
to: 257.407999992371 [s; relative to TRIGTIME]
T50: 149.824000000954 +/- 10.9264918622473
Measured from: 10.7680000066757
to: 160.592000007629 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 151.572000026703
to: 152.572000026703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -206.480000019073
to: 341.552000045776 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.884569 5.583652 4.399507 1.459114
0.282312 0.293351 0.256178 0.215523 [error]
Peak 0.053984 0.060856 0.045516 0.008113
0.012479 0.014051 0.011921 0.009207 [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 1.49e-06 2.55e-06 3.32e-06 8.75e-06 9.76e-06 1.61e-05 erg/cm2
Error 1.50e-07 1.51e-07 2.63e-07 1.51e-06 6.18e-07 1.70e-06 erg/cm2
Peak flux Power-law 5.79e-01 4.27e-01 2.09e-01 1.46e-01 1.28e+00 1.36e+00 ph/cm2/s
Error 1.88e-01 1.09e-01 8.51e-02 1.07e-01 3.24e-01 3.49e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-06 2.56e-06 3.34e-06 8.07e-06 9.75e-06 1.54e-05 erg/cm2
Error 1.62e-07 1.37e-07 2.65e-07 2.26e-06 6.26e-07 2.65e-06 erg/cm2
Peak flux Cutoff-PL 4.95e-01 5.16e-01 2.29e-01 3.94e-02 1.27e+00 1.28e+00 ph/cm2/s
Error 2.15e-01 1.50e-01 1.09e-01 9.08e-02 3.23e-01 3.30e-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 1.620 0.107 - - 1.91e-03 1.12e-04 42.550 57
CPL 1.618 0.222 10000.0 0.0 1.91e-03 0.00e+00 42.560 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 2.030 0.431 - - 8.44e-03 2.71e-03 79.100 57
CPL 0.570 2.017 44.2 0.0 5.49e-02 7.35e-01 76.640 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: 375.424000 sec.
T50 in the 50-300 keV band: 148.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 548.032 -206.480 341.552
T90 374.992 -117.584 257.408
T50 149.824 10.768 160.592
Peak 1.000 151.572 152.572
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
341.1833 -29.7451 0.0132 29.6763 55.4655 4.8817014 14.645 TRIG_00920783
Foreground time interval of the image:
-12.499 83.701 (delta_t = 96.200 [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 -206.480 sec. to 341.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61984 ( -0.106285 0.107272 )
Norm@50keV : 1.90890E-03 ( -0.000112496 0.00011194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.55 using 59 PHA bins.
# Reduced chi-squared = 0.7466 for 57 degrees of freedom
# Null hypothesis probability = 9.227679e-01
Photon flux (15-150 keV) in 548 sec: 0.246834 ( -0.0145103 0.0145505 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76026e-06 ( -6.15875e-07 6.19382e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -206.480 sec. to 341.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61794 ( -0.31278 0.130531 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.91325E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.56 using 59 PHA bins.
# Reduced chi-squared = 0.7600 for 56 degrees of freedom
# Null hypothesis probability = 9.073136e-01
Photon flux (15-150 keV) in 548 sec: 0.246880 ( -0.014662 0.013917 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.75155e-06 ( -6.27789e-07 6.23295e-07 ) ergs/cm2
Band function
Time interval is from -206.480 sec. to 341.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26153 ( 1.26486 1.26486 )
beta : -1.62048 ( 1.62049 0.106793 )
Epeak [keV] : 38.2110 ( -37.537 -37.537 )
Norm@50keV : 3.90039E-03 ( -0.00152385 291748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.55 using 59 PHA bins.
# Reduced chi-squared = 0.7737 for 55 degrees of freedom
# Null hypothesis probability = 8.898353e-01
Photon flux (15-150 keV) in 548 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] : 14.6788 ( )
R^2/D10^2 : 2.82482E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.61 using 59 PHA bins.
# Reduced chi-squared = 2.4669 for 57 degrees of freedom
# Null hypothesis probability = 5.124132e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.006e-07 7.727e-08
25- 50 2.728e-06 2.082e-07
50-150 3.961e-06 4.461e-07
15-150 7.390e-06 4.959e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 182.826 (-49.0189 -182.761)
Norm : 0.995237 (-0.0608138 0.0683375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.68 using 59 PHA bins.
# Reduced chi-squared = 0.8014 for 57 degrees of freedom
# Null hypothesis probability = 8.591544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.373e-06 1.211e-07
25- 50 2.613e-06 4.798e-07
50-150 5.564e-06 2.350e-06
15-150 9.551e-06 2.524e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.87305 (-0.949803 1.09287)
R1^2/D10^2 : 0.538072 (-0.255258 0.557195)
kT2 [keV] : 25.2996 (-3.57803 5.14235)
R2^2/D10^2 : 3.46503E-03 (-0.00164467 0.00254056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.73 using 59 PHA bins.
# Reduced chi-squared = 0.7587 for 55 degrees of freedom
# Null hypothesis probability = 9.065226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.519e-06 3.384e-07
25- 50 2.444e-06 3.472e-07
50-150 5.778e-06 1.063e-06
15-150 9.741e-06 1.444e-06
Peak spectrum fit
Power-law model
Time interval is from 151.572 sec. to 152.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02961 ( -0.390997 0.471091 )
Norm@50keV : 8.44154E-03 ( -0.00277489 0.0026476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.10 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.798602e-02
Photon flux (15-150 keV) in 1 sec: 1.28378 ( -0.324188 0.324188 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79807e-08 ( -2.31812e-08 2.40307e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 151.572 sec. to 152.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.569656 ( -2.45252 1.58189 )
Epeak [keV] : 44.2132 ( -44.2275 -44.2275 )
Norm@50keV : 5.49194E-02 ( -0.0547747 1.41564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.64 using 59 PHA bins.
# Reduced chi-squared = 1.369 for 56 degrees of freedom
# Null hypothesis probability = 3.488830e-02
Photon flux (15-150 keV) in 1 sec: 1.27333 ( -0.322153 0.32326 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.53513e-08 ( -2.24842e-08 2.41974e-08 ) ergs/cm2
Band function
Time interval is from 151.572 sec. to 152.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.561008 ( -5.28426 3.93398 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 44.0183 ( -29.0189 32.1696 )
Norm@50keV : 5.58761E-02 ( -0.0557443 1.43229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.64 using 59 PHA bins.
# Reduced chi-squared = 1.394 for 55 degrees of freedom
# Null hypothesis probability = 2.847675e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52391e-08 ( -7.52321e-08 -2.23242e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8368 (-2.74126 3.62727)
R^2/D10^2 : 0.481860 (-0.32003 0.933841)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.87 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.913567e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.179e-08 6.268e-09
25- 50 3.269e-08 1.546e-08
50-150 2.143e-08 1.310e-08
15-150 6.591e-08 2.714e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.8157 (-30.7214 79.805)
Norm : 6.69875 (-2.10368 2.97826)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.18 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 57 degrees of freedom
# Null hypothesis probability = 3.878038e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.706e-08 6.109e-09
25- 50 2.669e-08 1.106e-08
50-150 3.271e-08 2.590e-08
15-150 7.646e-08 4.025e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.73519 (-4.55925 67.9943)
R1^2/D10^2 : 5.58236 (-5.78987 -5.79237)
kT2 [keV] : 15.1846 (-5.10426 40.6033)
R2^2/D10^2 : 0.106643 (-0.109335 0.596218)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.16 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 55 degrees of freedom
# Null hypothesis probability = 3.095401e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.600e-08 9.040e-09
25- 50 2.683e-08 1.456e-08
50-150 3.276e-08 2.080e-08
15-150 7.559e-08 4.046e-08
Plot creation:
Mon Aug 19 17:28:37 EDT 2019