batgrbproduct analysis for trigger=821902
batgrbproduct Analysis for Trigger=821902
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): Wed Apr 4 23:06:41 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger821902/GCN5_download_cron
======================================================================
Trigger: 00821902 Segment: 000
BAT Trigger Time: 544500724.8 [s; MET]
Trigger Stop: 544500725.824 [s; MET]
UTC: 2018-04-04T02:11:44.070200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 53.3839578629457 Dec: -50.1951024002562 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.59
Image Trigger?: NO
Rate S/N Ratio: 39.3319208785943 [ if not an image trigger ]
Image S/N Ratio: 14.59
Flight Position: [ source = BAT ]
RA: 53.3839578629457 Dec: -50.1951024002562 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 53.3898643093204 Dec: -50.2132269518754 [deg; J2000]
{ 03h 33m 33.6s , -50d 12' 47.6" }
+/- 0.528100118934552 [arcmin] (estimated 90% radius based on SNR)
+/- 0.130096235094446 [arcmin] (formal 1-sigma fit error)
SNR: 75.7247766385932
Angular difference between Flight and Ground position is 1.110877 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 111.543999910355 +/- 7.11054681826168
Measured from: -0.243999838829041
to: 111.300000071526 [s; relative to TRIGTIME]
T50: 46.8439999818802 +/- 1.4740691571517
Measured from: 7.89600014686584
to: 54.740000128746 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.87999999523163
to: 9.87999999523163 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.90799999237061
to: 195.640000104904 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.437001 6.481063 5.557854 1.555460
0.080263 0.085778 0.078743 0.070485 [error]
Peak 0.083833 0.218272 0.261672 0.091826
0.007375 0.009263 0.009804 0.007382 [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 1.36e-06 2.74e-06 4.32e-06 1.50e-05 1.20e-05 2.35e-05 erg/cm2
Error 5.66e-08 6.51e-08 9.02e-08 7.66e-07 2.27e-07 7.93e-07 erg/cm2
Peak flux Power-law 9.42e-01 1.45e+00 1.67e+00 3.71e+00 5.16e+00 7.78e+00 ph/cm2/s
Error 8.74e-02 8.27e-02 7.53e-02 3.59e-01 2.27e-01 3.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-06 2.75e-06 4.35e-06 1.39e-05 1.20e-05 2.23e-05 erg/cm2
Error 5.89e-08 6.36e-08 8.07e-08 2.00e-06 2.48e-07 1.85e-06 erg/cm2
Peak flux Cutoff-PL 8.26e-01 1.48e+00 1.78e+00 2.38e+00 5.10e+00 6.47e+00 ph/cm2/s
Error 1.10e-01 8.95e-02 1.01e-01 6.58e-01 2.31e-01 6.80e-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 1.346 0.036 - - 6.10e-03 1.14e-04 31.300 57
CPL 1.341 0.129 3771.9 0.0 6.17e-03 7.68e-04 31.190 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.792 0.074 - - 4.49e-02 2.01e-03 58.780 57
CPL 0.317 0.315 211.7 155.7 7.19e-02 2.23e-02 51.380 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: 70.336000 sec.
T50 in the 50-300 keV band: 18.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 201.548 -5.908 195.640
T90 111.544 -0.244 111.300
T50 46.844 7.896 54.740
Peak 1.000 8.880 9.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
53.3899 -50.2132 0.0025 25.1 -147.3 6.4887 75.7 TRIG_00821902
------------------------------------------
Foreground time interval of the image:
-5.908 10.901 (delta_t = 16.809 [sec])
Background time interval of the image:
-239.800 -5.908 (delta_t = 233.892 [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 -5.908 sec. to 195.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34586 ( -0.0363754 0.0362999 )
Norm@50keV : 6.10312E-03 ( -0.000113675 0.000113555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.30 using 59 PHA bins.
# Reduced chi-squared = 0.5491 for 57 degrees of freedom
# Null hypothesis probability = 9.977765e-01
Photon flux (15-150 keV) in 201.5 sec: 0.734627 ( -0.0155969 0.0156792 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20222e-05 ( -2.27145e-07 2.2728e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.908 sec. to 195.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34105 ( -0.220263 0.0371896 )
Epeak [keV] : 3771.86 ( -3875.79 -3875.79 )
Norm@50keV : 6.16947E-03 ( -0.000135512 0.00139997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.19 using 59 PHA bins.
# Reduced chi-squared = 0.5570 for 56 degrees of freedom
# Null hypothesis probability = 9.970745e-01
Photon flux (15-150 keV) in 201.5 sec: 0.730486 ( -0.017853 0.017888 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19824e-05 ( -2.49094e-07 2.45951e-07 ) ergs/cm2
Band function
Time interval is from -5.908 sec. to 195.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11507 ( 0.997339 2.24583 )
beta : -1.37720 ( 1.3703 0.0522695 )
Epeak [keV] : 167.620 ( -114.323 572.571 )
Norm@50keV : 8.05403E-03 ( -0.00175886 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.12 using 59 PHA bins.
# Reduced chi-squared = 0.5476 for 55 degrees of freedom
# Null hypothesis probability = 9.974764e-01
Photon flux (15-150 keV) in 201.5 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] : 19.4510 ( )
R^2/D10^2 : 3.41052E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 574.85 using 59 PHA bins.
# Reduced chi-squared = 10.085 for 57 degrees of freedom
# Null hypothesis probability = 1.166929e-86
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.067e-07 2.106e-08
25- 50 2.477e-06 6.851e-08
50-150 6.917e-06 1.965e-07
15-150 9.901e-06 1.894e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.12791 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 168.72 using 59 PHA bins.
# Reduced chi-squared = 2.9601 for 57 degrees of freedom
# Null hypothesis probability = 5.498643e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.569e-06 2.992e-08
25- 50 3.019e-06 6.448e-08
50-150 6.621e-06 1.400e-07
15-150 1.121e-05 2.287e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.42613 (-0.663266 0.704232)
R1^2/D10^2 : 0.359651 (-0.0814712 0.113184)
kT2 [keV] : 33.1182 (-2.5923 3.31678)
R2^2/D10^2 : 4.77759E-03 (-0.00129257 0.00153328)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.62 using 59 PHA bins.
# Reduced chi-squared = 0.8295 for 55 degrees of freedom
# Null hypothesis probability = 8.122227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.120e-06 8.120e-08
25- 50 2.838e-06 1.088e-07
50-150 7.936e-06 3.526e-07
15-150 1.189e-05 4.221e-07
Peak spectrum fit
Power-law model
Time interval is from 8.880 sec. to 9.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.792232 ( -0.0744093 0.0732915 )
Norm@50keV : 4.49075E-02 ( -0.00201093 0.00200426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.78 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.100340e-01
Photon flux (15-150 keV) in 1 sec: 5.16280 ( -0.226973 0.227094 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.26505e-07 ( -2.45782e-08 2.46211e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.880 sec. to 9.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.317475 ( -0.32719 0.303528 )
Epeak [keV] : 211.729 ( -62.2169 249.183 )
Norm@50keV : 7.19490E-02 ( -0.0182879 0.0263875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.38 using 59 PHA bins.
# Reduced chi-squared = 0.9175 for 56 degrees of freedom
# Null hypothesis probability = 6.502059e-01
Photon flux (15-150 keV) in 1 sec: 5.09897 ( -0.23061 0.23063 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18874e-07 ( -2.5787e-08 2.5637e-08 ) ergs/cm2
Band function
Time interval is from 8.880 sec. to 9.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.857926 ( 0.857835 0.857835 )
beta : -0.792232 ( -0.0732784 0.074432 )
Epeak [keV] : 15.5293 ( -15.5302 -15.5302 )
Norm@50keV : 6.44474E-02 ( -0.0225055 1.12148e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.78 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 55 degrees of freedom
# Null hypothesis probability = 3.387597e-01
Photon flux (15-150 keV) in 1 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] : 24.9085 (-1.47064 1.61814)
R^2/D10^2 : 0.135242 (-0.0231821 0.0272018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.11 using 59 PHA bins.
# Reduced chi-squared = 1.8090 for 57 degrees of freedom
# Null hypothesis probability = 1.786092e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.461e-08 1.335e-09
25- 50 8.270e-08 5.995e-09
50-150 3.807e-07 2.450e-08
15-150 4.780e-07 2.530e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 19.5986 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 325.54 using 59 PHA bins.
# Reduced chi-squared = 5.7112 for 57 degrees of freedom
# Null hypothesis probability = 2.817798e-39
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.880e-08 2.280e-09
25- 50 9.388e-08 4.910e-09
50-150 2.059e-07 3.405e-08
15-150 3.486e-07 3.990e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.6770 (-3.13867 3.46917)
R1^2/D10^2 : 0.566470 (-0.209124 0.45071)
kT2 [keV] : 49.5501 (-15.517 138.325)
R2^2/D10^2 : 1.42408E-02 (-0.0095164 0.0239101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.63 using 59 PHA bins.
# Reduced chi-squared = 0.8842 for 55 degrees of freedom
# Null hypothesis probability = 7.151241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.315e-08 5.100e-09
25- 50 9.241e-08 1.925e-08
50-150 4.006e-07 1.558e-07
15-150 5.161e-07 1.732e-07
Plot creation:
Wed Apr 4 23:18:46 EDT 2018