batgrbproduct analysis for trigger=966554
batgrbproduct Analysis for Trigger=966554
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): Fri Apr 17 13:12:28 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger966554/GCN5_download_cron
======================================================================
Trigger: 00966554 Segment: 000
BAT Trigger Time: 608713541.952 [s; MET]
Trigger Stop: 608713542.464 [s; MET]
UTC: 2020-04-16T07:05:17.171400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.690709384972 Dec: -7.52998032721292 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.19
Image Trigger?: NO
Rate S/N Ratio: 21.6564078277077 [ if not an image trigger ]
Image S/N Ratio: 10.19
Flight Position: [ source = BAT ]
RA: 335.690709384972 Dec: -7.52998032721292 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.693167695492 Dec: -7.52707694546284 [deg; J2000]
{ 22h 22m 46.4s , -07d 31' 37.5" }
+/- 1.34450707674511 [arcmin] (estimated 90% radius based on SNR)
+/- 0.42853354311957 [arcmin] (formal 1-sigma fit error)
SNR: 19.9276836104916
Angular difference between Flight and Ground position is 0.227440 arcmin
Partial Coding Fraction: 0.3398438 [ including projection effects ]
Duration
T90: 6.06400001049042 +/- 0.978652179375191
Measured from: -1.82399988174438
to: 4.24000012874603 [s; relative to TRIGTIME]
T50: 3.18400013446808 +/- 0.609261909202546
Measured from: -0.031999945640564
to: 3.15200018882751 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0279999971389771
to: 0.972000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.33599996566772
to: 4.95999991893768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.467875 0.558780 0.358480 0.146420
0.039232 0.041368 0.035994 0.030836 [error]
Peak 0.097578 0.179086 0.126061 0.020780
0.016553 0.017668 0.015895 0.011904 [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 1.68e-07 2.62e-07 3.08e-07 7.01e-07 9.43e-07 1.44e-06 erg/cm2
Error 2.23e-08 2.16e-08 3.59e-08 1.71e-07 8.46e-08 2.02e-07 erg/cm2
Peak flux Power-law 1.38e+00 1.26e+00 7.91e-01 7.63e-01 3.74e+00 4.19e+00 ph/cm2/s
Error 2.75e-01 1.61e-01 1.25e-01 2.37e-01 4.72e-01 5.11e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-07 2.62e-07 3.08e-07 6.92e-07 9.42e-07 1.43e-06 erg/cm2
Error 2.27e-08 1.67e-08 2.71e-08 2.66e-07 8.40e-08 2.80e-07 erg/cm2
Peak flux Cutoff-PL 1.23e+00 1.33e+00 8.40e-01 4.17e-01 3.66e+00 3.82e+00 ph/cm2/s
Error 3.29e-01 1.97e-01 1.47e-01 -------- 4.83e-01 6.17e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.23e+00 1.34e+00 8.38e-01 4.79e-01 3.66e+00 3.89e+00 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 1.766 0.146 - - 1.40e-02 1.22e-03 57.020 57
CPL 1.760 0.507 9937.7 -0.0 1.41e-02 8.13e-03 57.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.666 0.204 - - 2.85e-02 3.62e-03 43.940 57
CPL 1.047 0.859 77.8 -27.0 5.87e-02 7.64e-02 42.280 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: 4.672000 sec.
T50 in the 50-300 keV band: 3.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.296 -2.336 4.960
T90 6.064 -1.824 4.240
T50 3.184 -0.032 3.152
Peak 1.000 -0.028 0.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.6932 -7.5271 0.0097 47.1 -168.2 1.5994 19.9 TRIG_00966554
------------------------------------------
Foreground time interval of the image:
-2.336 4.960 (delta_t = 7.296 [sec])
Background time interval of the image:
-216.851 -2.336 (delta_t = 214.515 [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 -2.336 sec. to 4.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76625 ( -0.144947 0.147804 )
Norm@50keV : 1.40172E-02 ( -0.0012244 0.00121116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.02 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.741936e-01
Photon flux (15-150 keV) in 7.296 sec: 1.90686 ( -0.159647 0.159991 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.42855e-07 ( -8.43731e-08 8.48824e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.336 sec. to 4.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76036 ( -0.435836 0.577658 )
Epeak [keV] : 9937.66 ( -9999.25 -9999.26 )
Norm@50keV : 1.41199E-02 ( -0.00678805 0.00946428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 56 degrees of freedom
# Null hypothesis probability = 4.362199e-01
Photon flux (15-150 keV) in 7.296 sec: 1.90632 ( -0.15963 0.15967 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.42052e-07 ( -8.34079e-08 8.45096e-08 ) ergs/cm2
Band function
Time interval is from -2.336 sec. to 4.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93486 ( -4.93486 -4.93486 )
beta : -1.85159 ( -0.17586 0.165577 )
Epeak [keV] : 23.0858 ( -6.2666 4.0031 )
Norm@50keV : 2756.46 ( -221.752 1.25061e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.66 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 55 degrees of freedom
# Null hypothesis probability = 4.876368e-01
Photon flux (15-150 keV) in 7.296 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] : 11.9551 (-1.31222 1.50145)
R^2/D10^2 : 0.453261 (-0.161416 0.247271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.23 using 59 PHA bins.
# Reduced chi-squared = 1.9164 for 57 degrees of freedom
# Null hypothesis probability = 3.871981e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.993e-08 1.390e-08
25- 50 3.131e-07 3.371e-08
50-150 2.684e-07 4.994e-08
15-150 6.815e-07 6.982e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 114.230 (-30.8129 66.1235)
Norm : 8.20764 (-0.923491 0.979729)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.12 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.635387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.562e-07 2.003e-08
25- 50 2.771e-07 2.513e-08
50-150 4.824e-07 1.704e-07
15-150 9.157e-07 2.001e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.03646 (-1.24732 1.39625)
R1^2/D10^2 : 2.58307 (-1.21944 2.69212)
kT2 [keV] : 32.9920 (-9.29264 22.6258)
R2^2/D10^2 : 8.89375E-03 (-0.00681591 0.018679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.65 using 59 PHA bins.
# Reduced chi-squared = 0.9936 for 55 degrees of freedom
# Null hypothesis probability = 4.880148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.611e-07 3.754e-08
25- 50 2.751e-07 6.037e-08
50-150 5.255e-07 2.584e-07
15-150 9.617e-07 3.056e-07
Peak spectrum fit
Power-law model
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66585 ( -0.200715 0.207013 )
Norm@50keV : 2.85057E-02 ( -0.00363686 0.00360526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7709 for 57 degrees of freedom
# Null hypothesis probability = 8.975486e-01
Photon flux (15-150 keV) in 1 sec: 3.74183 ( -0.471009 0.472097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64707e-07 ( -3.5202e-08 3.54319e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04656 ( -0.976567 0.742042 )
Epeak [keV] : 77.7500 ( -23.6939 -77.75 )
Norm@50keV : 5.86962E-02 ( -0.031739 0.121135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7550 for 56 degrees of freedom
# Null hypothesis probability = 9.125077e-01
Photon flux (15-150 keV) in 1 sec: 3.66390 ( -0.48257 0.48312 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57299e-07 ( -3.7239e-08 3.7149e-08 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03738 ( 1.02506 1.02506 )
beta : -2.45644 ( 2.47536 4.01306 )
Epeak [keV] : 76.7948 ( -76.1472 253.575 )
Norm@50keV : 5.94555E-02 ( -0.0274182 0.71236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.27 using 59 PHA bins.
# Reduced chi-squared = 0.7685 for 55 degrees of freedom
# Null hypothesis probability = 8.957313e-01
Photon flux (15-150 keV) in 1 sec: 3.66042 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57646e-07 ( -2.57639e-07 -3.6266e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0553 (-1.9677 2.2678)
R^2/D10^2 : 0.532892 (-0.223883 0.385079)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9752 for 57 degrees of freedom
# Null hypothesis probability = 5.282959e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.223e-08 5.280e-09
25- 50 8.300e-08 1.544e-08
50-150 1.082e-07 2.520e-08
15-150 2.134e-07 3.560e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 153.184 (-61.2753 -151.729)
Norm : 15.4664 (-2.08228 2.67845)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.49 using 59 PHA bins.
# Reduced chi-squared = 0.7454 for 57 degrees of freedom
# Null hypothesis probability = 9.238263e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.965e-08 1.341e-08
25- 50 7.372e-08 3.958e-08
50-150 1.468e-07 8.510e-08
15-150 2.601e-07 1.258e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.32130 (-2.79595 3.17682)
R1^2/D10^2 : 3.44218 (-2.29419 15.0651)
kT2 [keV] : 24.0140 (-6.95593 22.6052)
R2^2/D10^2 : 5.48982E-02 (-0.0497686 0.167639)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.20 using 59 PHA bins.
# Reduced chi-squared = 0.7673 for 55 degrees of freedom
# Null hypothesis probability = 8.971759e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.660e-08 1.981e-08
25- 50 7.741e-08 3.984e-08
50-150 1.430e-07 8.005e-08
15-150 2.570e-07 1.293e-07
Plot creation:
Fri Apr 17 13:19:44 EDT 2020