batgrbproduct analysis for trigger=981957
batgrbproduct Analysis for Trigger=981957
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 v2.47
Process Start Time (local time): Sun Jul 12 15:20:21 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger981957/GCN5_download_cron
======================================================================
Trigger: 00981957 Segment: 000
BAT Trigger Time: 616158301.76 [s; MET]
Trigger Stop: 616158302.784 [s; MET]
UTC: 2020-07-11T11:04:36.495000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.976650447479 Dec: -0.136296528746014 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.78
Image Trigger?: NO
Rate S/N Ratio: 65.9621103361619 [ if not an image trigger ]
Image S/N Ratio: 6.78
Flight Position: [ source = BAT ]
RA: 285.976650447479 Dec: -0.136296528746014 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.97451793404 Dec: -0.134479982898015 [deg; J2000]
{ 19h 03m 53.9s , -00d 08' 04.1" }
+/- 1.44862171888403 [arcmin] (estimated 90% radius based on SNR)
+/- 0.73050839336008 [arcmin] (formal 1-sigma fit error)
SNR: 17.9135919316971
Angular difference between Flight and Ground position is 0.168080 arcmin
Partial Coding Fraction: 0.08691406 [ including projection effects ]
Duration
T90: 29.3919999599457 +/- 3.07170836177462
Measured from: -3.26399981975555
to: 26.1280001401901 [s; relative to TRIGTIME]
T50: 16.9760000705719 +/- 1.5463195407979
Measured from: -0.25599992275238
to: 16.7200001478195 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.195999979972839
to: 1.19599997997284 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.72000002861023
to: 29.7280000448227 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.970877 2.868098 2.428452 0.673610
0.153741 0.161667 0.144093 0.117041 [error]
Peak 0.146729 0.390642 0.345508 0.135375
0.036367 0.041100 0.042467 0.035367 [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 6.48e-07 1.25e-06 1.87e-06 6.06e-06 5.28e-06 9.84e-06 erg/cm2
Error 7.17e-08 8.34e-08 1.37e-07 9.74e-07 3.40e-07 1.06e-06 erg/cm2
Peak flux Power-law 1.90e+00 2.40e+00 2.20e+00 3.53e+00 7.71e+00 1.00e+01 ph/cm2/s
Error 4.47e-01 3.55e-01 3.19e-01 1.05e+00 1.00e+00 1.39e+00 ph/cm2/s
Fluence Cutoff-PL 6.06e-07 1.29e-06 1.93e-06 3.93e-06 5.19e-06 7.76e-06 erg/cm2
Error 8.77e-08 9.57e-08 1.57e-07 1.76e-06 3.61e-07 1.48e-06 erg/cm2
Peak flux Cutoff-PL 1.54e+00 2.60e+00 2.44e+00 1.42e+00 7.48e+00 8.00e+00 ph/cm2/s
Error 5.21e-01 4.29e-01 3.96e-01 1.26e+00 1.02e+00 1.57e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.26e+00 2.89e+00 2.26e+00 2.39e+00 7.38e+00 8.80e+00 ph/cm2/s
Error 5.82e-01 5.11e-01 3.70e-01 -------- 1.02e+00 1.57e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.418 0.104 - - 1.59e-02 9.51e-04 56.950 57
CPL 1.093 0.403 150.6 -46.5 2.27e-02 1.03e-02 55.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.123 0.207 - - 6.63e-02 8.48e-03 62.810 57
CPL 0.121 0.997 99.9 148.0 2.01e-01 3.00e-01 58.890 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: 22.656000 sec.
T50 in the 50-300 keV band: 12.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.448 -4.720 29.728
T90 29.392 -3.264 26.128
T50 16.976 -0.256 16.720
Peak 1.000 0.196 1.196
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.9745 -0.1345 0.0108 38.9 99.0 5.6778 17.9 TRIG_00981957
------------------------------------------
Foreground time interval of the image:
-4.720 11.541 (delta_t = 16.261 [sec])
Background time interval of the image:
-239.760 -4.720 (delta_t = 235.040 [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 -4.720 sec. to 29.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41791 ( -0.10416 0.104133 )
Norm@50keV : 1.59130E-02 ( -0.000951119 0.000950667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.95 using 59 PHA bins.
# Reduced chi-squared = 0.9991 for 57 degrees of freedom
# Null hypothesis probability = 4.769330e-01
Photon flux (15-150 keV) in 34.45 sec: 1.94593 ( -0.122458 0.122732 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27808e-06 ( -3.39614e-07 3.40646e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.720 sec. to 29.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09316 ( -0.438968 0.366655 )
Epeak [keV] : 150.623 ( -57.7169 -150.623 )
Norm@50keV : 2.26916E-02 ( -0.00723564 0.0134301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 56 degrees of freedom
# Null hypothesis probability = 5.108817e-01
Photon flux (15-150 keV) in 34.45 sec: 1.91596 ( -0.12769 0.12785 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19075e-06 ( -3.61656e-07 3.5983e-07 ) ergs/cm2
Band function
Time interval is from -4.720 sec. to 29.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09315 ( -0.226125 0.405932 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 150.600 ( -47.6285 -150.6 )
Norm@50keV : 2.26894E-02 ( -0.00723604 0.0134338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.727932e-01
Photon flux (15-150 keV) in 34.45 sec: 1.91684 ( ) 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] : 17.0071 (-1.27704 1.40926)
R^2/D10^2 : 0.145618 (-0.0352378 0.045672)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.24 using 59 PHA bins.
# Reduced chi-squared = 1.9691 for 57 degrees of freedom
# Null hypothesis probability = 1.774377e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.955e-07 3.826e-08
25- 50 1.308e-06 1.082e-07
50-150 2.701e-06 2.875e-07
15-150 4.305e-06 2.825e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.8734 -200)
Norm : 8.09483 (-0.483914 0.483914)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.03 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.332991e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.944e-07 4.410e-08
25- 50 1.336e-06 9.853e-08
50-150 2.930e-06 5.893e-07
15-150 4.960e-06 5.994e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.58620 (-1.64613 1.8604)
R1^2/D10^2 : 1.39459 (-0.689426 1.81029)
kT2 [keV] : 28.1090 (-4.88309 8.68301)
R2^2/D10^2 : 2.07103E-02 (-0.0125951 0.0212669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.435711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.709e-07 1.295e-07
25- 50 1.313e-06 2.827e-07
50-150 3.309e-06 1.040e-06
15-150 5.193e-06 1.268e-06
Peak spectrum fit
Power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12332 ( -0.208576 0.205952 )
Norm@50keV : 6.62843E-02 ( -0.00847984 0.00847952 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.779203e-01
Photon flux (15-150 keV) in 1 sec: 7.70691 ( -1.00224 1.00365 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87956e-07 ( -9.72615e-08 9.80969e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.120822 ( -1.11744 0.87577 )
Epeak [keV] : 99.8880 ( -27.8708 268.226 )
Norm@50keV : 0.200672 ( -0.122771 0.476935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.702432e-01
Photon flux (15-150 keV) in 1 sec: 7.47856 ( -1.02252 1.02357 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50283e-07 ( -1.07718e-07 1.06624e-07 ) ergs/cm2
Band function
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.120282 ( -0.817762 0.874352 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 99.8618 ( -21.9136 264.155 )
Norm@50keV : 0.200772 ( -0.122874 0.476956 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.351824e-01
Photon flux (15-150 keV) in 1 sec: 7.37777 ( -0.37777 -1.02844 ) 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] : 18.3094 (-2.66865 3.31729)
R^2/D10^2 : 0.501501 (-0.211405 0.340398)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.02 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.437703e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.347e-08 8.675e-09
25- 50 1.568e-07 3.385e-08
50-150 3.831e-07 9.335e-08
15-150 5.734e-07 1.118e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.3249 -200)
Norm : 31.3494 (-4.12774 4.12774)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.06 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.639093e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.807e-08 4.387e-08
25- 50 1.502e-07 8.415e-08
50-150 3.294e-07 1.842e-07
15-150 5.576e-07 3.095e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.3892 (-4.29384 5.49757)
R1^2/D10^2 : 1.71484 (-0.951891 3.5494)
kT2 [keV] : 30.8539 (-13.8693 -35.4491)
R2^2/D10^2 : 6.10421E-02 (-0.0390039 0.207295)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.861331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.708e-08 2.732e-08
25- 50 1.558e-07 8.850e-08
50-150 4.288e-07 2.411e-07
15-150 6.316e-07 3.346e-07
Plot creation:
Sun Jul 12 15:24:11 EDT 2020