batgrbproduct analysis for trigger=975895
batgrbproduct Analysis for Trigger=975895
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): Thu Jun 4 21:26:48 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger975895/GCN5_download_cron
======================================================================
Trigger: 00975895 Segment: 000
BAT Trigger Time: 612905360 [s; MET]
Trigger Stop: 612905424 [s; MET]
UTC: 2020-06-03T19:28:54.947120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.179726952209 Dec: -15.5807046869375 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.74
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.74
Flight Position: [ source = BAT ]
RA: 245.179726952209 Dec: -15.5807046869375 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.065123757692 Dec: -15.6199357829478 [deg; J2000]
{ 16h 20m 15.6s , -15d 37' 11.8" }
+/- 1.40485884399561 [arcmin] (estimated 90% radius based on SNR)
+/- 0.538221892734886 [arcmin] (formal 1-sigma fit error)
SNR: 18.7160646798704
Angular difference between Flight and Ground position is 7.028743 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.634686 0.210281 -0.039821 -0.046592
0.069551 0.061517 0.051011 0.044164 [error]
Peak 1.634686 0.210281 -0.039821 -0.046592
0.069551 0.061517 0.051011 0.044164 [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 5.11e-07 9.27e-08 8.08e-09 7.62e-10 6.13e-07 6.13e-07 erg/cm2
Error 6.22e-08 2.84e-08 5.88e-09 1.12e-09 7.31e-08 7.32e-08 erg/cm2
Peak flux Power-law 2.79e-01 2.95e-02 1.29e-03 5.84e-05 3.10e-01 3.10e-01 ph/cm2/s
Error 3.49e-02 8.57e-03 9.11e-04 8.32e-05 3.64e-02 3.64e-02 ph/cm2/s
Fluence Cutoff-PL 5.17e-07 8.13e-08 2.49e-09 1.29e-11 6.01e-07 6.01e-07 erg/cm2
Error 6.57e-08 6.08e-08 7.57e-09 1.06e-09 7.79e-08 9.67e-08 erg/cm2
Peak flux Cutoff-PL 2.82e-01 2.74e-02 6.04e-04 5.32e-06 3.09e-01 3.09e-01 ph/cm2/s
Error 3.74e-02 1.41e-02 1.19e-03 7.88e-05 3.65e-02 3.67e-02 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 5.520 0.584 - - 1.22e-04 7.09e-05 65.880 57
CPL 1.000 0.000 50.0 0.0 2.37e-03 0.00e+00 212.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.520 0.584 - - 1.22e-04 7.09e-05 65.880 57
CPL 1.000 0.000 50.0 0.0 2.37e-03 0.00e+00 212.850 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0651 -15.6199 0.0103 23.7 56.4 2.5732 18.7 TRIG_00975895
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.51971 ( -0.562485 0.6059 )
Norm@50keV : 1.21525E-04 ( -5.58619e-05 8.58438e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.88 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.966893e-01
Photon flux (15-150 keV) in 64 sec: 0.310295 ( -0.0364023 0.0364104 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1262e-07 ( -7.29587e-08 7.32403e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.36618E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 212.85 using 59 PHA bins.
# Reduced chi-squared = 3.8009 for 56 degrees of freedom
# Null hypothesis probability = 3.965228e-20
Photon flux (15-150 keV) in 64 sec: 0.308895 ( -0.036626 0.036437 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0065e-07 ( -7.54957e-08 8.02906e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.46185 ( 5.97061 8.46185 )
beta : -5.59129 ( -0.551774 0.625218 )
Epeak [keV] : 319.185 ( -319.185 -319.185 )
Norm@50keV : 1.53632E-02 ( -0.00682582 0.0125235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.92 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.487342e-01
Photon flux (15-150 keV) in 64 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] : 2.60000 (-0.268047 0.31533)
R^2/D10^2 : 115.055 (-65.0119 149.752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.76 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.765872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.346e-07 1.875e-07
25- 50 4.593e-08 2.065e-08
50-150 2.115e-11 2.003e-11
15-150 5.805e-07 2.011e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.84926 (-0.768863 1.00763)
Norm : 79.5184 (-39.6893 82.6475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.96 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.947894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.269e-07 1.400e-07
25- 50 6.208e-08 2.337e-08
50-150 2.751e-10 2.417e-10
15-150 5.892e-07 1.320e-07
Double BB
#Fit statistic : Chi-Squared = 66.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.40 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.71 using 59 PHA bins.
# Reduced chi-squared = 1.612 for 55 degrees of freedom
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 2.700763e-03
# Null hypothesis probability = 1.328947e-01
# Null hypothesis probability = 1.365786e-01
# Null hypothesis probability = 1.394836e-01
# Null hypothesis probability = 1.967153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.082e-07 5.072e-03
25- 50 1.181e-07 3.894e-02
50-150 8.931e-10 9.597e-01
15-150 5.273e-07 9.808e-01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.51971 ( -0.562485 0.6059 )
Norm@50keV : 1.21525E-04 ( -5.58619e-05 8.58438e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.88 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.966893e-01
Photon flux (15-150 keV) in 64 sec: 0.310295 ( -0.0364023 0.0364104 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1262e-07 ( -7.29587e-08 7.32403e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.36618E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 212.85 using 59 PHA bins.
# Reduced chi-squared = 3.8009 for 56 degrees of freedom
# Null hypothesis probability = 3.965228e-20
Photon flux (15-150 keV) in 64 sec: 0.308895 ( -0.036626 0.036437 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0065e-07 ( -7.54957e-08 8.02906e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.46185 ( 5.97061 8.46185 )
beta : -5.59129 ( -0.551774 0.625218 )
Epeak [keV] : 319.185 ( -319.185 -319.185 )
Norm@50keV : 1.53632E-02 ( -0.00682582 0.0125235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.92 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.487342e-01
Photon flux (15-150 keV) in 64 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] : 2.60000 (-0.268047 0.31533)
R^2/D10^2 : 115.055 (-65.0119 149.752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.76 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.765872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.346e-07 1.724e-07
25- 50 4.593e-08 1.733e-08
50-150 2.115e-11 1.935e-11
15-150 5.805e-07 1.766e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.84926 (-0.768863 1.00763)
Norm : 79.5184 (-39.6893 82.6475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.96 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.947894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.269e-07 1.530e-07
25- 50 6.208e-08 2.131e-08
50-150 2.751e-10 2.444e-10
15-150 5.892e-07 1.631e-07
Double BB
#Fit statistic : Chi-Squared = 66.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.40 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.71 using 59 PHA bins.
# Reduced chi-squared = 1.612 for 55 degrees of freedom
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 2.700763e-03
# Null hypothesis probability = 1.328947e-01
# Null hypothesis probability = 1.365786e-01
# Null hypothesis probability = 1.394836e-01
# Null hypothesis probability = 1.967153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.082e-07 4.435e-03
25- 50 1.181e-07 4.294e-02
50-150 8.931e-10 9.837e-01
15-150 5.273e-07 9.360e-01
Plot creation:
Thu Jun 4 21:30:44 EDT 2020