batgrbproduct analysis for trigger=915091
batgrbproduct Analysis for Trigger=915091
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 Jul 19 13:38:30 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger915091/GCN5_download_cron
======================================================================
Trigger: 00915091 Segment: 000
BAT Trigger Time: 585117698.432 [s; MET]
Trigger Stop: 585117698.944 [s; MET]
UTC: 2019-07-18T04:41:15.172960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.531055639195 Dec: -41.2205538392556 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.69
Image Trigger?: NO
Rate S/N Ratio: 18.1383571472171 [ if not an image trigger ]
Image S/N Ratio: 6.69
Flight Position: [ source = BAT ]
RA: 336.531055639195 Dec: -41.2205538392556 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.605340172291 Dec: -41.1841257242472 [deg; J2000]
{ 22h 26m 25.3s , -41d 11' 02.9" }
+/- 2.38675036038499 [arcmin] (estimated 90% radius based on SNR)
+/- 1.74673363217075 [arcmin] (formal 1-sigma fit error)
SNR: 8.77797013297704
Angular difference between Flight and Ground position is 4.002853 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 720 +/- 35.7770876399966
Measured from: 0.568000078201294
to: 720.568000078201 [s; relative to TRIGTIME]
T50: 720 +/- 526.361092787071
Measured from: 0.568000078201294
to: 720.568000078201 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.067999958992
to: 9.067999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.567999958992004
to: 720.567999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.160505 0.246178 -0.139602 -0.297490
0.185179 0.190408 0.165685 0.144251 [error]
Peak 0.009514 0.004217 0.017296 0.001724
0.006977 0.007251 0.006295 0.005214 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 2.10e-08 2.82e-08 4.36e-08 1.35e-06 1.18e-07 1.36e-06 erg/cm2
Peak flux Power-law 2.61e-02 5.27e-02 8.32e-02 2.91e-01 2.32e-01 4.53e-01 ph/cm2/s
Error 5.21e-02 5.81e-02 6.47e-02 6.47e-01 1.92e-01 5.73e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.40e-08 1.12e-07 1.06e-07 4.26e-07 1.76e-07 -------- erg/cm2
Peak flux Cutoff-PL 2.55e-02 5.21e-02 1.12e-01 2.93e-01 1.80e-01 4.54e-01 ph/cm2/s
Error 3.91e-02 5.80e-02 7.01e-02 3.70e-01 1.28e-01 -------- ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- 9.33e-08 -------- -------- -------- -------- 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 1.500 0.000 - - 0.00e+00 1.65e-05 70.490 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 70.490 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.342 0.828 - - 1.90e-03 1.67e-03 57.820 57
CPL -9.996 4.634 99.2 -38.1 4.06e-01 2.52e+00 56.620 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: 15.360000 sec.
T50 in the 50-300 keV band: 11.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 720.000 0.568 720.568
T90 720.000 0.568 720.568
T50 720.000 0.568 720.568
Peak 1.000 8.068 9.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.6053 -41.1841 0.0219 10.1 25.7 0.5413 8.8 TRIG_00915091
------------------------------------------
Foreground time interval of the image:
0.568 17.669 (delta_t = 17.101 [sec])
Background time interval of the image:
-58.331 0.568 (delta_t = 58.899 [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
0.568000 141.258000
142.568000 720.568000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 3.30366e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.49 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.080263e-01
Photon flux (15-150 keV) in 718.7 sec: 0.0 ( 0 0.00414338 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.36876e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.568000 141.258000
142.568000 720.568000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.49 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 56 degrees of freedom
# Null hypothesis probability = 9.206533e-02
Photon flux (15-150 keV) in 718.7 sec: 0.0 ( 0 0.00749433 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 3.51345e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.568000 141.258000
142.568000 720.568000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.37767 ( 0.98395 0.98395 )
beta : -9.37167 ( 2.5 2.5 )
Epeak [keV] : 44.9463 ( -80 -80 )
Norm@50keV : 4.28369E-02 ( -0.0427973 0.0994413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.77 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 55 degrees of freedom
# Null hypothesis probability = 8.672744e-02
Photon flux (15-150 keV) in 718.7 sec: 0.0 ( ) 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.49 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.080263e-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
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.49 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.080263e-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
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00000 (-4 -4)
R1^2/D10^2 : 0.0 (0 0)
kT2 [keV] : 12.1127 (-12.0822 -12.0822)
R2^2/D10^2 : 4.28852E-04 (-0.000423786 -0.000423786)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.26 using 59 PHA bins.
# Reduced chi-squared = 1.278 for 55 degrees of freedom
# Null hypothesis probability = 8.057039e-02
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
Peak spectrum fit
Power-law model
Time interval is from 8.068 sec. to 9.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.342117 ( -0.342094 1.31357 )
Norm@50keV : 1.89565E-03 ( -0.00189563 0.00144256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.448885e-01
Photon flux (15-150 keV) in 1 sec: 0.231535 ( -0.231536 0.15159 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76803e-08 ( -2.76803e-08 1.52639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.068 sec. to 9.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99617 ( 9.99821 19.2663 )
Epeak [keV] : 99.1563 ( -22.971 -99.1735 )
Norm@50keV : 0.405961 ( -0.405163 4.62929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.518144e-01
Photon flux (15-150 keV) in 1 sec: 0.180459 0.179795 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.13689e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 8.068 sec. to 9.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.823305 ( 0.822902 0.822902 )
beta : -0.342826 ( -1.31638 0.342102 )
Epeak [keV] : 11.8130 ( -11.8061 -11.8061 )
Norm@50keV : 3.09313E-03 ( -0.00309308 162857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.716436e-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] : 43.9848 (-44.2107 -44.2107)
R^2/D10^2 : 1.44549E-03 (-0.00143395 0.00930237)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.512443e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.828e-09 1.883e-09
25- 50 1.800e-09 1.457e-09
50-150 6.961e-11 9.755e-11
15-150 4.698e-09 4.018e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 0.976174 (-0.631167 0.631167)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.501528e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.431e-09 1.813e-09
25- 50 4.676e-09 3.217e-09
50-150 1.025e-08 7.550e-09
15-150 1.736e-08 1.335e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.97644 (-3.91667 146.197)
R1^2/D10^2 : 2.56797 (-2.65795 32.0254)
kT2 [keV] : 51.3012 (-28.3931 -51.1522)
R2^2/D10^2 : 9.66961E-04 (-0.000927056 0.0066653)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.317032e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.542e-09 1.650e-09
25- 50 2.785e-09 1.361e-09
50-150 2.480e-08 1.567e-08
15-150 3.013e-08 1.680e-08
Plot creation:
Fri Jul 19 13:42:50 EDT 2019