batgrbproduct analysis for trigger=811074
batgrbproduct Analysis for Trigger=811074
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 Feb 21 16:58:18 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger811074/batgroup_hand_proc
======================================================================
Trigger: 00811074 Segment: 000
BAT Trigger Time: 540887465.344 [s; MET]
Trigger Stop: 540887481.728 [s; MET]
UTC: 2018-02-21T06:30:44.832320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 326.772376374209 Dec: -72.8682959674159 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 7.01
Flight Position: [ source = BAT ]
RA: 326.772376374209 Dec: -72.8682959674159 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 326.78701485979 Dec: -72.8909126255786 [deg; J2000]
{ 21h 47m 08.9s , -72d 53' 27.3" }
+/- 2.92319815061936 [arcmin] (estimated 90% radius based on SNR)
+/- 1.74848868825821 [arcmin] (formal 1-sigma fit error)
SNR: 6.57062356294032
Angular difference between Flight and Ground position is 1.381412 arcmin
Partial Coding Fraction: 0.3125 [ including projection effects ]
Duration
T90: 11 +/- 3.16227766016838
Measured from: 1.65600001811981
to: 12.6560000181198 [s; relative to TRIGTIME]
T50: 7 +/- 3.60555127546399
Measured from: 2.65600001811981
to: 9.65600001811981 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.65600001811981
to: 3.65600001811981 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.65600001811981
to: 14.6560000181198 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.261867 0.365360 0.235548 0.031659
0.059640 0.066344 0.059783 0.067162 [error]
Peak 0.045751 0.045230 0.061815 -0.004705
0.016544 0.019120 0.017315 0.019041 [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 9.58e-08 1.55e-07 1.90e-07 4.56e-07 5.70e-07 8.97e-07 erg/cm2
Error 2.98e-08 3.22e-08 5.94e-08 2.95e-07 1.41e-07 3.52e-07 erg/cm2
Peak flux Power-law 5.01e-01 4.92e-01 3.38e-01 3.65e-01 1.48e+00 1.70e+00 ph/cm2/s
Error 2.61e-01 1.65e-01 1.45e-01 3.22e-01 4.80e-01 5.61e-01 ph/cm2/s
Fluence Cutoff-PL 8.62e-08 1.70e-07 1.95e-07 1.51e-07 5.38e-07 6.02e-07 erg/cm2
Error 3.49e-08 4.28e-08 6.70e-08 3.65e-07 1.48e-07 4.01e-07 erg/cm2
Peak flux Cutoff-PL 4.09e-01 5.37e-01 3.70e-01 1.45e-01 1.42e+00 1.46e+00 ph/cm2/s
Error 3.78e-01 2.08e-01 1.80e-01 2.26e-01 5.65e-01 8.18e-01 ph/cm2/s
Fluence Band 8.58e-08 1.69e-07 1.94e-07 1.57e-07 5.39e-07 6.11e-07 erg/cm2
Error -------- -------- 6.43e-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 1.709 0.371 - - 4.74e-03 1.11e-03 59.630 57
CPL 0.904 1.630 63.7 0.0 1.27e-02 6.66e-02 58.730 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.542 0.584 - - 1.17e-02 4.01e-03 74.560 57
CPL 0.511 1.091 73.6 -8.2 3.80e-02 4.14e+02 74.170 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 13.000 1.656 14.656
T90 11.000 1.656 12.656
T50 7.000 2.656 9.656
Peak 1.000 2.656 3.656
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
326.7870 -72.8909 0.0292 41.6116 -43.2779 0.9432692 6.571 TRIG_00811074
Foreground time interval of the image:
1.656 14.656 (delta_t = 13.000 [sec])
Background time interval of the image:
-239.344 1.656 (delta_t = 241.000 [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 1.656 sec. to 14.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70915 ( -0.356822 0.384639 )
Norm@50keV : 4.74084E-03 ( -0.00112966 0.00109313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.63 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.800704e-01
Photon flux (15-150 keV) in 13 sec: 0.631662 ( -0.131624 0.131711 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70231e-07 ( -1.38391e-07 1.42834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.656 sec. to 14.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.904459 ( -1.94356 1.31693 )
Epeak [keV] : 63.7076 ( -63.7082 -63.7082 )
Norm@50keV : 1.27448E-02 ( -0.0127445 0.120426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 56 degrees of freedom
# Null hypothesis probability = 3.758154e-01
Photon flux (15-150 keV) in 13 sec: 0.613600 ( -0.135549 0.13548 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37718e-07 ( -1.41993e-07 1.53436e-07 ) ergs/cm2
Band function
Time interval is from 1.656 sec. to 14.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907373 ( -1.15067 1.20065 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 63.3781 ( -31.6473 -63.443 )
Norm@50keV : 1.27617E-02 ( -0.0127467 0.120303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.405298e-01
Photon flux (15-150 keV) in 13 sec: 0.616718 ( 6.38328 -0.138833 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38963e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.0974 (-2.8615 3.66851)
R^2/D10^2 : 0.115116 (-0.0684199 0.16434)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.49 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.876859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.444e-08 2.365e-08
25- 50 1.890e-07 7.119e-08
50-150 2.059e-07 9.774e-08
15-150 4.493e-07 1.659e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 138.363 (-71.8875 -128.588)
Norm : 2.54958 (-0.599631 0.915878)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.06 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.000700e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.566e-08 5.010e-08
25- 50 1.569e-07 8.918e-08
50-150 2.991e-07 1.910e-07
15-150 5.417e-07 3.210e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.33603 (-2.92718 6.15139)
R1^2/D10^2 : 3.63112 (-3.45718 4838.44)
kT2 [keV] : 17.0998 (-4.97772 18.0541)
R2^2/D10^2 : 3.75832E-02 (-0.0357451 0.105012)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.613623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.167e-08 4.958e-08
25- 50 1.574e-07 8.164e-08
50-150 2.706e-07 1.654e-07
15-150 5.197e-07 2.792e-07
Peak spectrum fit
Power-law model
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54204 ( -0.558754 0.60911 )
Norm@50keV : 1.16919E-02 ( -0.00409 0.00392876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.56 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.912293e-02
Photon flux (15-150 keV) in 1 sec: 1.47674 ( -0.479102 0.480246 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10196e-07 ( -4.02757e-08 4.16034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.510973 ( -0.499518 1.68185 )
Epeak [keV] : 73.5957 ( -57.0288 -73.3636 )
Norm@50keV : 3.80039E-02 ( -0.0387788 827.505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.17 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 56 degrees of freedom
# Null hypothesis probability = 5.242123e-02
Photon flux (15-150 keV) in 1 sec: 1.41686 ( -0.636521 0.49385 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04223e-07 ( -3.90061e-08 4.4406e-08 ) ergs/cm2
Band function
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.509054 ( 0.872274 3.31099 )
beta : -9.99973 ( 9.99973 19.9997 )
Epeak [keV] : 73.5234 ( -49.5132 -73.5234 )
Norm@50keV : 3.81197E-02 ( -0.0243349 2.12838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.17 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 55 degrees of freedom
# Null hypothesis probability = 4.339286e-02
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] : 15.5842 (-4.19323 6.30703)
R^2/D10^2 : 0.154607 (-0.154607 0.304594)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.65 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.837037e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.807e-09 5.050e-09
25- 50 3.211e-08 1.918e-08
50-150 5.394e-08 3.798e-08
15-150 9.386e-08 5.835e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.001 (-142.972 -199.036)
Norm : 6.05108 (-1.93661 2.6233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.38 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.088224e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.507e-08 9.265e-09
25- 50 2.899e-08 1.772e-08
50-150 6.353e-08 4.001e-08
15-150 1.076e-07 6.455e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.75079 (-2.7451 14.471)
R1^2/D10^2 : 89.5327 (-90.2141 -90.2141)
kT2 [keV] : 17.4998 (-5.07913 10.0714)
R2^2/D10^2 : 9.48287E-02 (-0.0949707 0.232937)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.21 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 55 degrees of freedom
# Null hypothesis probability = 5.963946e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.543e-08 7.840e-09
25- 50 2.757e-08 1.691e-08
50-150 5.857e-08 3.862e-08
15-150 1.016e-07 5.940e-08
Plot creation:
Wed Feb 21 18:07:02 EST 2018