batgrbproduct analysis for trigger=820347
batgrbproduct Analysis for Trigger=820347
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): Sun Apr 1 01:59:44 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger820347/GCN5_download_cron
======================================================================
Trigger: 00820347 Segment: 000
BAT Trigger Time: 544162516.416 [s; MET]
Trigger Stop: 544162524.608 [s; MET]
UTC: 2018-03-31T04:14:55.706640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 66.0170123130039 Dec: 13.3978789028324 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.89
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 8.89
Flight Position: [ source = BAT ]
RA: 66.0170123130039 Dec: 13.3978789028324 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 66.0047593375547 Dec: 13.3859011128743 [deg; J2000]
{ 04h 24m 01.1s , +13d 23' 09.2" }
+/- 1.93953393764461 [arcmin] (estimated 90% radius based on SNR)
+/- 0.740323044680519 [arcmin] (formal 1-sigma fit error)
SNR: 11.8065257391785
Angular difference between Flight and Ground position is 1.013892 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: 0.584000110626221
to: 48.5840001106262 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 0.584000110626221
to: 32.5840001106262 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.08399999141693
to: 9.08399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.583999991416931
to: 48.5839999914169 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.220638 0.458129 0.291089 0.052436
0.042597 0.044111 0.038686 0.034704 [error]
Peak 0.008376 0.027450 0.024311 0.000201
0.005951 0.006552 0.005765 0.005020 [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 8.83e-08 1.67e-07 2.43e-07 7.54e-07 6.88e-07 1.25e-06 erg/cm2
Error 1.68e-08 2.03e-08 3.74e-08 2.42e-07 9.21e-08 2.73e-07 erg/cm2
Peak flux Power-law 1.37e-01 1.71e-01 1.55e-01 2.46e-01 5.47e-01 7.09e-01 ph/cm2/s
Error 6.65e-02 5.32e-02 4.49e-02 1.46e-01 1.48e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 7.32e-08 1.92e-07 2.51e-07 1.43e-07 6.14e-07 6.59e-07 erg/cm2
Error 1.97e-08 2.78e-08 4.52e-08 1.74e-07 1.01e-07 1.98e-07 erg/cm2
Peak flux Cutoff-PL 8.85e-02 1.93e-01 1.82e-01 5.91e-02 5.10e-01 5.23e-01 ph/cm2/s
Error 7.78e-02 6.85e-02 5.84e-02 1.49e-01 1.55e-01 2.12e-01 ph/cm2/s
Fluence Band 6.93e-08 2.01e-07 2.33e-07 3.93e-07 6.36e-07 8.98e-07 erg/cm2
Error 2.12e-08 -------- 5.09e-08 -------- -------- 3.33e-07 erg/cm2
Peak flux Band 1.10e-01 2.00e-01 1.92e-01 9.58e-02 5.65e-01 5.96e-01 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 1.457 0.193 - - 1.50e-03 1.82e-04 64.590 57
CPL 0.114 1.043 66.1 28.3 7.64e-03 1.56e-02 57.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.137 0.428 - - 4.70e-03 1.24e-03 51.550 57
CPL -0.774 2.990 77.4 -27.2 3.72e-02 8.92e-01 49.210 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: 8.768000 sec.
T50 in the 50-300 keV band: 6.336000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 0.584 48.584
T90 48.000 0.584 48.584
T50 32.000 0.584 32.584
Peak 1.000 8.084 9.084
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.0048 +13.3859 0.0163 24.6 -141.1 1.0709 11.8 TRIG_00820347
------------------------------------------
Foreground time interval of the image:
0.584 48.584 (delta_t = 48.000 [sec])
Background time interval of the image:
-200.215 0.584 (delta_t = 200.799 [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 0.584 sec. to 48.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45745 ( -0.192486 0.19384 )
Norm@50keV : 1.49971E-03 ( -0.000182256 0.000181298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.285635e-01
Photon flux (15-150 keV) in 48 sec: 0.185161 ( -0.0220013 0.0220254 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87941e-07 ( -9.14539e-08 9.27739e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.584 sec. to 48.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.114192 ( -1.17233 0.913553 )
Epeak [keV] : 66.1316 ( -13.0652 43.5022 )
Norm@50keV : 7.64229E-03 ( -0.00764237 0.0235714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.122982e-01
Photon flux (15-150 keV) in 48 sec: 0.175856 ( -0.022867 0.022891 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13762e-07 ( -9.85968e-08 1.03906e-07 ) ergs/cm2
Band function
Time interval is from 0.584 sec. to 48.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.114025 ( -0.776757 0.769955 )
beta : -10.00000 ( 10 2.79921e-07 )
Epeak [keV] : 66.1181 ( -11.5447 43.5173 )
Norm@50keV : 7.64454E-03 ( -0.00764454 0.0236059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.758495e-01
Photon flux (15-150 keV) in 48 sec: 0.175882 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36034e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1995 (-1.75696 2.08211)
R^2/D10^2 : 2.66349E-02 (-0.010273 0.0159653)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.53 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.864707e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.437e-08 1.159e-08
25- 50 2.051e-07 3.295e-08
50-150 2.742e-07 6.866e-08
15-150 5.337e-07 8.172e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-75.7649 -199.363)
Norm : 0.764622 (-0.0892755 0.0892776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.20 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.964538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.139e-08 5.110e-08
25- 50 1.758e-07 9.754e-08
50-150 3.856e-07 2.111e-07
15-150 6.528e-07 3.576e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.85379 (-4.94155 4.21812)
R1^2/D10^2 : 7.77544E-02 (-0.0447362 0.572688)
kT2 [keV] : 22.8373 (-8.76469 -23.7411)
R2^2/D10^2 : 3.26473E-03 (-0.00274434 0.0177092)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.18 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Null hypothesis probability = 3.940690e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.133e-08 4.231e-08
25- 50 1.973e-07 1.049e-07
50-150 3.554e-07 1.852e-07
15-150 6.240e-07 3.206e-07
Peak spectrum fit
Power-law model
Time interval is from 8.084 sec. to 9.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13737 ( -0.439983 0.416169 )
Norm@50keV : 4.69793E-03 ( -0.00123887 0.00123702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9043 for 57 degrees of freedom
# Null hypothesis probability = 6.789981e-01
Photon flux (15-150 keV) in 1 sec: 0.547094 ( -0.147819 0.148789 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85454e-08 ( -1.36115e-08 1.38299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.084 sec. to 9.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.774162 ( -3.93201 2.0487 )
Epeak [keV] : 77.4173 ( -22.9583 -77.2986 )
Norm@50keV : 3.71930E-02 ( -0.0375808 1.74678 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.21 using 59 PHA bins.
# Reduced chi-squared = 0.8787 for 56 degrees of freedom
# Null hypothesis probability = 7.277696e-01
Photon flux (15-150 keV) in 1 sec: 0.509865 ( -0.153473 0.155754 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.34893e-08 ( -1.41461e-08 1.52292e-08 ) ergs/cm2
Band function
Time interval is from 8.084 sec. to 9.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.12023 ( -2.28114 -1.08181 )
beta : -2.60779 ( 2.62717 2.74321 )
Epeak [keV] : 72.0122 ( -73.4416 163.257 )
Norm@50keV : 5.54565E-02 ( -0.0485801 8.53367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8925 for 55 degrees of freedom
# Null hypothesis probability = 6.987538e-01
Photon flux (15-150 keV) in 1 sec: 0.564904 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90554e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.3693 (-4.41893 6.67918)
R^2/D10^2 : 3.58381E-02 (-0.0232114 0.0546958)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8659 for 57 degrees of freedom
# Null hypothesis probability = 7.540735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.405e-09 1.303e-09
25- 50 1.129e-08 6.565e-09
50-150 2.780e-08 1.472e-08
15-150 4.149e-08 2.241e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-88.6184 -199.363)
Norm : 2.27566 (-0.613605 0.613632)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 57 degrees of freedom
# Null hypothesis probability = 6.059612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.667e-09 3.443e-09
25- 50 1.090e-08 6.420e-09
50-150 2.391e-08 1.469e-08
15-150 4.047e-08 2.370e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.30 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.07 using 59 PHA bins.
# Reduced chi-squared = 0.8974 for 55 degrees of freedom
# Reduced chi-squared = 0.8963 for 55 degrees of freedom
# Reduced chi-squared = 0.8944 for 55 degrees of freedom
# Reduced chi-squared = 0.8922 for 55 degrees of freedom
# Null hypothesis probability = 6.891491e-01
# Null hypothesis probability = 6.912905e-01
# Null hypothesis probability = 6.950550e-01
# Null hypothesis probability = 6.994787e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sun Apr 1 02:04:41 EDT 2018