batgrbproduct analysis for trigger=814305
batgrbproduct Analysis for Trigger=814305
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): Thu Mar 15 21:20:49 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger814305/GCN5_download_cron
======================================================================
Trigger: 00814305 Segment: 000
BAT Trigger Time: 542759037.568 [s; MET]
Trigger Stop: 542759038.592 [s; MET]
UTC: 2018-03-14T22:23:36.943440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.866097981945 Dec: 23.6232874833055 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: NO
Rate S/N Ratio: 6.6332495807108 [ if not an image trigger ]
Image S/N Ratio: 7.74
Flight Position: [ source = BAT ]
RA: 297.866097981945 Dec: 23.6232874833055 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.855450619029 Dec: 23.6344730605309 [deg; J2000]
{ 19h 51m 25.3s , +23d 38' 04.1" }
+/- 1.9510250732033 [arcmin] (estimated 90% radius based on SNR)
+/- 0.751387474932641 [arcmin] (formal 1-sigma fit error)
SNR: 11.7073112525068
Angular difference between Flight and Ground position is 0.890492 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 73 +/- 9.4339811320566
Measured from: -44.5679998397827
to: 28.4320001602173 [s; relative to TRIGTIME]
T50: 20 +/- 20.2237484161567
Measured from: -11.5679998397827
to: 8.43200016021729 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.567999958992004
to: 0.432000041007996 [s; relative to TRIGTIME]
Total Fluence
Measured from: -47.567999958992
to: 34.432000041008 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.854862 0.713040 0.315505 -0.024068
0.083592 0.081115 0.067686 0.054355 [error]
Peak 0.050808 0.033578 0.032628 0.006020
0.010244 0.009562 0.007760 0.006017 [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 2.95e-07 3.14e-07 2.37e-07 2.90e-07 9.56e-07 1.14e-06 erg/cm2
Error 4.51e-08 4.10e-08 5.97e-08 1.38e-07 1.40e-07 2.21e-07 erg/cm2
Peak flux Power-law 5.01e-01 3.63e-01 1.74e-01 1.18e-01 1.09e+00 1.16e+00 ph/cm2/s
Error 1.68e-01 8.14e-02 6.76e-02 8.96e-02 2.48e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 2.82e-07 3.48e-07 2.07e-07 5.89e-08 8.82e-07 8.96e-07 erg/cm2
Error 4.87e-08 5.45e-08 7.77e-08 1.53e-07 1.50e-07 1.97e-07 erg/cm2
Peak flux Cutoff-PL 5.02e-01 3.63e-01 1.74e-01 1.17e-01 1.09e+00 1.16e+00 ph/cm2/s
Error 2.21e-01 8.15e-02 8.34e-02 1.13e-01 2.46e-01 2.67e-01 ph/cm2/s
Fluence Band 3.20e-07 3.93e-07 2.92e-07 1.92e-07 1.11e-06 1.20e-06 erg/cm2
Error 5.62e-08 -------- -------- -------- 1.91e-07 -------- erg/cm2
Peak flux Band 6.16e-01 4.51e-01 1.93e-01 7.51e-02 1.31e+00 1.33e+00 ph/cm2/s
Error -------- -------- -------- -------- 2.51e-01 2.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.407 0.249 - - 1.20e-03 2.23e-04 63.230 57
CPL 1.463 1.033 21.1 16.3 4.64e-03 0.00e+00 60.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.058 0.463 - - 7.10e-03 2.07e-03 59.470 57
CPL 2.063 0.806 476.1 0.0 7.06e-03 0.00e+00 59.470 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 82.000 -47.568 34.432
T90 73.000 -44.568 28.432
T50 20.000 -11.568 8.432
Peak 1.000 -0.568 0.432
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
297.8555 +23.6345 0.0164 33.3 -152.7 2.0637 11.7 TRIG_00814305
------------------------------------------
Foreground time interval of the image:
-47.568 -20.268 (delta_t = 27.300 [sec])
-19.568 17.833 (delta_t = 37.401 [sec])
Background time interval of the image:
-129.467 -47.568 (delta_t = 81.899 [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
Multiple GTIs in the spectrum
tstart tstop
-47.568000 -20.268000
-19.568000 34.432000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40651 ( -0.237591 0.260879 )
Norm@50keV : 1.20370E-03 ( -0.000224616 0.000221062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.23 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.657586e-01
Photon flux (15-150 keV) in 81.3 sec: 0.223565 ( -0.0268121 0.0268135 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.56015e-07 ( -1.37988e-07 1.42301e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-47.568000 -20.268000
-19.568000 34.432000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46317 ( -1.32032 0.745223 )
Epeak [keV] : 21.0760 ( -20.4139 12.1105 )
Norm@50keV : 4.63741E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.166393e-01
Photon flux (15-150 keV) in 81.3 sec: 0.217849 ( -0.027184 0.027287 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8169e-07 ( -1.4254e-07 1.566e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-47.568000 -20.268000
-19.568000 34.432000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.42998 ( -14.0192 -4.42998 )
beta : -2.66712 ( -0.424725 0.329913 )
Epeak [keV] : 22.0546 ( -3.92208 3.5471 )
Norm@50keV : 231.882 ( -27.5932 6793.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.861196e-01
Photon flux (15-150 keV) in 81.3 sec: 0.218924 ( 6.78108 -0.028397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11387e-06 ( -1.1133e-06 -2.09689e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.49357 (-0.995156 1.1607)
R^2/D10^2 : 0.316403 (-0.141442 0.255995)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.30 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.108828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.477e-07 5.207e-08
25- 50 3.858e-07 7.199e-08
50-150 8.129e-08 3.100e-08
15-150 7.148e-07 1.215e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.2546 (-9.28664 13.6936)
Norm : 1.55033 (-0.340694 0.466245)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.53 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.498274e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.793e-07 4.228e-08
25- 50 3.515e-07 5.224e-08
50-150 2.433e-07 9.150e-08
15-150 8.741e-07 1.423e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.16891 (-1.45383 1.44478)
R1^2/D10^2 : 1.09390 (-0.668568 2.94156)
kT2 [keV] : 15.5196 (-4.95301 9.28506)
R2^2/D10^2 : 9.48093E-03 (-0.00861584 0.0492386)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.263912e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.852e-07 1.584e-07
25- 50 3.329e-07 1.753e-07
50-150 2.716e-07 1.606e-07
15-150 8.897e-07 4.549e-07
Peak spectrum fit
Power-law model
Time interval is from -0.568 sec. to 0.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05754 ( -0.424727 0.502084 )
Norm@50keV : 7.10318E-03 ( -0.00215853 0.00199099 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.857279e-01
Photon flux (15-150 keV) in 1 sec: 1.09466 ( -0.247277 0.24777 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57513e-08 ( -1.73881e-08 1.78684e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.568 sec. to 0.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06284 ( -1.53279 0.0798279 )
Epeak [keV] : 476.102 ( )
Norm@50keV : 7.05612E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.504471e-01
Photon flux (15-150 keV) in 1 sec: 1.09460 ( -0.245336 0.24679 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.59262e-08 ( -1.78687e-08 1.75763e-08 ) ergs/cm2
Band function
Time interval is from -0.568 sec. to 0.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.30004 ( 6.30004 6.30004 )
beta : -2.05755 ( -0.502074 0.424913 )
Epeak [keV] : 20.8282 ( -20.8282 -20.8282 )
Norm@50keV : 0.965418 ( -0.293371 0.270608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.161492e-01
Photon flux (15-150 keV) in 1 sec: 1.30677 ( 5.69323 -0.24649 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.39571e-08 ( -7.39501e-08 -1.76605e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2296 (-3.76665 4.25196)
R^2/D10^2 : 0.171694 (-0.110271 0.412061)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.516507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.371e-09 3.460e-09
25- 50 2.236e-08 9.009e-09
50-150 2.499e-08 1.377e-08
15-150 5.372e-08 2.394e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.2559 (-36.8824 121.069)
Norm : 5.17912 (-1.5874 2.48216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.587396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.336e-08 4.488e-09
25- 50 2.159e-08 7.410e-09
50-150 2.895e-08 2.220e-08
15-150 6.391e-08 3.316e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.48903 (-1.29692 1.60303)
R1^2/D10^2 : 30.8517 (-26.0443 426.122)
kT2 [keV] : 17.9221 (-4.70621 7.78451)
R2^2/D10^2 : 4.69221E-02 (-0.0344593 0.103915)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.571325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.692e-08 9.730e-09
25- 50 1.726e-08 9.490e-09
50-150 3.246e-08 2.087e-08
15-150 6.664e-08 3.714e-08
Plot creation:
Thu Mar 15 21:27:28 EDT 2018