batgrbproduct analysis for trigger=819301
batgrbproduct Analysis for Trigger=819301
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): Fri Mar 30 02:10:33 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger819301/GCN5_download_cron
======================================================================
Trigger: 00819301 Segment: 000
BAT Trigger Time: 543977901.504 [s; MET]
Trigger Stop: 543977909.696 [s; MET]
UTC: 2018-03-29T00:58:00.805800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 329.297998471192 Dec: -15.0707756964668 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.9
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 6.9
Flight Position: [ source = BAT ]
RA: 329.297998471192 Dec: -15.0707756964668 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 329.313681609916 Dec: -15.0433298584773 [deg; J2000]
{ 21h 57m 15.3s , -15d 02' 36.0" }
+/- 2.32500683744888 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21035040556067 [arcmin] (formal 1-sigma fit error)
SNR: 9.11287027475045
Angular difference between Flight and Ground position is 1.880821 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 9.07599997520447 +/- 1.83236021171092
Measured from: 0.100000143051147
to: 9.17600011825562 [s; relative to TRIGTIME]
T50: 5.32799994945526 +/- 1.56560024191524
Measured from: 1.52000021934509
to: 6.84800016880035 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.14000010490417
to: 2.14000010490417 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 9.69200003147125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.094696 0.122980 0.096190 0.030897
0.020457 0.021253 0.018320 0.014816 [error]
Peak 0.019497 0.021256 0.018600 0.004610
0.006640 0.006844 0.005976 0.004843 [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 2.75e-08 5.40e-08 8.22e-08 2.72e-07 2.30e-07 4.36e-07 erg/cm2
Error 8.45e-09 9.90e-09 1.83e-08 1.36e-07 4.45e-08 1.49e-07 erg/cm2
Peak flux Power-law 1.94e-01 1.80e-01 1.16e-01 1.15e-01 5.37e-01 6.04e-01 ph/cm2/s
Error 8.94e-02 5.46e-02 4.85e-02 9.69e-02 1.61e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 2.75e-08 5.42e-08 8.14e-08 2.51e-07 2.29e-07 4.14e-07 erg/cm2
Error 8.52e-09 1.01e-08 1.83e-08 1.77e-07 4.43e-08 1.35e-07 erg/cm2
Peak flux Cutoff-PL 1.81e-01 1.90e-01 1.20e-01 6.69e-02 5.29e-01 5.57e-01 ph/cm2/s
Error 1.03e-01 6.71e-02 5.43e-02 1.10e-01 1.64e-01 2.04e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.78e-01 1.91e-01 1.21e-01 6.17e-02 5.27e-01 5.51e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.62e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.393 0.313 - - 2.38e-03 4.10e-04 57.070 57
CPL 2.457 1.366 152.6 0.0 6.50e-04 0.00e+00 56.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.637 0.539 - - 4.13e-03 1.36e-03 52.980 57
CPL 1.168 2.029 85.2 0.0 7.30e-03 1.27e-01 52.790 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 9.988 -0.296 9.692
T90 9.076 0.100 9.176
T50 5.328 1.520 6.848
Peak 1.000 1.140 2.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
329.3137 -15.0433 0.0212 23.1 -48.3 0.3420 9.1 TRIG_00819301
------------------------------------------
Foreground time interval of the image:
-0.296 9.692 (delta_t = 9.988 [sec])
Background time interval of the image:
-239.504 -57.249 (delta_t = 182.255 [sec])
-56.504 -0.296 (delta_t = 56.208 [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 -0.296 sec. to 9.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39336 ( -0.313036 0.312713 )
Norm@50keV : 2.38410E-03 ( -0.000411701 0.000408967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.725374e-01
Photon flux (15-150 keV) in 9.988 sec: 0.289905 ( -0.0502443 0.0504298 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30407e-07 ( -4.42415e-08 4.48465e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 9.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.45709 ( -1.81211 0.919579 )
Epeak [keV] : 152.603 ( )
Norm@50keV : 6.50012E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.565716e-01
Photon flux (15-150 keV) in 9.988 sec: 0.290408 ( -0.050851 0.049863 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28715e-07 ( -4.26538e-08 4.60437e-08 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 9.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18492 ( 1.18489 1.18489 )
beta : -1.39333 ( -0.312889 0.313041 )
Epeak [keV] : 19.9942 ( -20.0059 -20.0059 )
Norm@50keV : 4.72323E-03 ( -0.00274232 0.374894 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.981176e-01
Photon flux (15-150 keV) in 9.988 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] : 15.8623 (-3.51864 5.13304)
R^2/D10^2 : 2.69165E-02 (-0.0164957 0.0373073)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.73 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.372354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.401e-08 4.939e-09
25- 50 5.853e-08 1.617e-08
50-150 1.026e-07 3.922e-08
15-150 1.751e-07 5.034e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-81.2159 -199.363)
Norm : 1.19221 (-0.203147 0.203691)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.49 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.204514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.965e-08 1.732e-08
25- 50 5.704e-08 3.224e-08
50-150 1.251e-07 7.116e-08
15-150 2.118e-07 1.202e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.08132 (-6.66784 4.28069)
R1^2/D10^2 : 0.137244 (-0.0813981 27.4268)
kT2 [keV] : 50.2621 (-36.8167 -54.7047)
R2^2/D10^2 : 5.57994E-04 (-0.000419135 0.0161632)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.30 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.550773e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.364e-08 1.389e-08
25- 50 5.874e-08 3.286e-08
50-150 1.547e-07 8.779e-08
15-150 2.371e-07 1.193e-07
Peak spectrum fit
Power-law model
Time interval is from 1.140 sec. to 2.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63701 ( -0.514756 0.562552 )
Norm@50keV : 4.13045E-03 ( -0.00139469 0.00132857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9295 for 57 degrees of freedom
# Null hypothesis probability = 6.266505e-01
Photon flux (15-150 keV) in 1 sec: 0.537049 ( -0.160518 0.16065 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84662e-08 ( -1.32367e-08 1.37487e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.140 sec. to 2.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16837 ( -2.92274 1.13594 )
Epeak [keV] : 85.2205 ( -85.2215 -85.2215 )
Norm@50keV : 7.30035E-03 ( -0.00730029 0.246668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
# Reduced chi-squared = 0.9427 for 56 degrees of freedom
# Null hypothesis probability = 5.970405e-01
Photon flux (15-150 keV) in 1 sec: 0.529036 ( -0.164571 0.163267 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72628e-08 ( -1.38304e-08 1.44732e-08 ) ergs/cm2
Band function
Time interval is from 1.140 sec. to 2.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17028 ( -1.00202 5.94484 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 85.4136 ( -67.1302 -85.4136 )
Norm@50keV : 7.28093E-03 ( -0.0044877 0.246939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
# Reduced chi-squared = 0.9599 for 55 degrees of freedom
# Null hypothesis probability = 5.594207e-01
Photon flux (15-150 keV) in 1 sec: 0.526896 ( 6.4731 -0.159642 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72414e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4216 (-4.27526 6.73665)
R^2/D10^2 : 8.94383E-02 (-0.0894105 0.262323)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.19 using 59 PHA bins.
# Reduced chi-squared = 0.9683 for 57 degrees of freedom
# Null hypothesis probability = 5.431837e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.414e-09 2.170e-09
25- 50 1.216e-08 7.510e-09
50-150 1.410e-08 1.035e-08
15-150 2.968e-08 1.885e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 154.393 (-104.303 -153.734)
Norm : 2.22715 (-0.687239 1.0509)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.81 using 59 PHA bins.
# Reduced chi-squared = 0.9265 for 57 degrees of freedom
# Null hypothesis probability = 6.329352e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.706e-09 3.435e-09
25- 50 1.062e-08 6.115e-09
50-150 2.121e-08 1.365e-08
15-150 3.754e-08 2.311e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.35002 (-3.35051 11.756)
R1^2/D10^2 : 10.3038 (-10.2965 -10.2965)
kT2 [keV] : 17.0168 (-6.31543 -17.0198)
R2^2/D10^2 : 3.47815E-02 (-0.0347595 0.156669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.74 using 59 PHA bins.
# Reduced chi-squared = 0.9589 for 55 degrees of freedom
# Null hypothesis probability = 5.615514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.755e-09 3.421e-09
25- 50 9.862e-09 5.735e-09
50-150 1.878e-08 1.182e-08
15-150 3.440e-08 1.870e-08
Plot creation:
Fri Mar 30 02:18:00 EDT 2018