batgrbproduct analysis for trigger=878911
batgrbproduct Analysis for Trigger=878911
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): Mon Dec 24 19:50:27 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger878911/batgroup_hand_proc
======================================================================
Trigger: 00878911 Segment: 000
BAT Trigger Time: 567351433.728 [s; MET]
Trigger Stop: 567351434.752 [s; MET]
UTC: 2018-12-24T13:36:51.593320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 125.931158144386 Dec: 6.20566865282203 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.72
Image Trigger?: NO
Rate S/N Ratio: 10.1488915650922 [ if not an image trigger ]
Image S/N Ratio: 8.72
Flight Position: [ source = BAT ]
RA: 125.931158144386 Dec: 6.20566865282203 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 125.948927463552 Dec: 6.19442664189159 [deg; J2000]
{ 08h 23m 47.7s , +06d 11' 39.9" }
+/- 1.85483463166046 [arcmin] (estimated 90% radius based on SNR)
+/- 0.705343035518379 [arcmin] (formal 1-sigma fit error)
SNR: 12.5841893055931
Angular difference between Flight and Ground position is 1.256350 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 12.4879999160767 +/- 4.20341810663401
Measured from: -9.50800001621246
to: 2.9799998998642 [s; relative to TRIGTIME]
T50: 4.39599990844727 +/- 1.82103493633097
Measured from: -3.02799999713898
to: 1.36799991130829 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.479999899864197
to: 1.4799998998642 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.0360000133514
to: 3.30399990081787 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.161565 0.264346 0.252307 0.001988
0.028814 0.030101 0.026589 0.022730 [error]
Peak 0.022956 0.044222 0.048606 0.014019
0.007527 0.008370 0.007294 0.006309 [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 5.10e-08 1.08e-07 1.79e-07 6.76e-07 4.94e-07 1.01e-06 erg/cm2
Error 1.09e-08 1.42e-08 2.49e-08 2.05e-07 6.31e-08 2.21e-07 erg/cm2
Peak flux Power-law 2.24e-01 3.00e-01 2.94e-01 5.18e-01 9.88e-01 1.34e+00 ph/cm2/s
Error 9.05e-02 7.27e-02 5.75e-02 2.31e-01 1.90e-01 2.62e-01 ph/cm2/s
Fluence Cutoff-PL 4.27e-08 1.16e-07 1.93e-07 2.45e-07 4.70e-07 5.96e-07 erg/cm2
Error 1.32e-08 1.69e-08 2.94e-08 -------- 6.74e-08 2.63e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 3.01e-01 2.94e-01 5.11e-01 9.89e-01 1.33e+00 ph/cm2/s
Error 8.98e-02 6.99e-02 6.28e-02 4.28e-01 1.90e-01 3.25e-01 ph/cm2/s
Fluence Band 4.24e-08 1.16e-07 1.92e-07 2.46e-07 4.71e-07 6.00e-07 erg/cm2
Error 1.24e-08 1.67e-08 2.81e-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 1.269 0.196 - - 3.23e-03 3.78e-04 41.330 57
CPL 0.413 0.888 99.4 225.2 8.22e-03 9.58e-03 37.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.026 0.343 - - 8.57e-03 1.60e-03 74.810 57
CPL 1.028 0.406 9999.4 0.0 8.62e-03 0.00e+00 74.810 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: 6.528000 sec.
T50 in the 50-300 keV band: 3.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.340 -12.036 3.304
T90 12.488 -9.508 2.980
T50 4.396 -3.028 1.368
Peak 1.000 0.480 1.480
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
125.9489 +6.1944 0.0152 30.0 -171.2 0.7210 12.6 TRIG_00878911
------------------------------------------
Foreground time interval of the image:
-12.036 3.304 (delta_t = 15.340 [sec])
Background time interval of the image:
-239.728 -12.036 (delta_t = 227.692 [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 -12.036 sec. to 3.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26911 ( -0.197289 0.194623 )
Norm@50keV : 3.23207E-03 ( -0.000377709 0.000377689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7250 for 57 degrees of freedom
# Null hypothesis probability = 9.412536e-01
Photon flux (15-150 keV) in 15.34 sec: 0.383487 ( -0.0462796 0.0464067 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93736e-07 ( -6.28879e-08 6.33909e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.036 sec. to 3.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.413066 ( -0.980843 0.795513 )
Epeak [keV] : 99.4492 ( -28.2782 422.157 )
Norm@50keV : 8.22399E-03 ( -0.0046987 0.014456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.91 using 59 PHA bins.
# Reduced chi-squared = 0.6769 for 56 degrees of freedom
# Null hypothesis probability = 9.695130e-01
Photon flux (15-150 keV) in 15.34 sec: 0.370031 ( -0.048194 0.048161 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.70435e-07 ( -6.71079e-08 6.75942e-08 ) ergs/cm2
Band function
Time interval is from -12.036 sec. to 3.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.412649 ( -0.734284 1.07308 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 99.4074 ( -24.1076 418.92 )
Norm@50keV : 8.22818E-03 ( -0.00470447 0.0144737 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.91 using 59 PHA bins.
# Reduced chi-squared = 0.6893 for 55 degrees of freedom
# Null hypothesis probability = 9.618214e-01
Photon flux (15-150 keV) in 15.34 sec: 0.374951 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.70674e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.2214 (-2.41007 2.88312)
R^2/D10^2 : 2.41128E-02 (-0.00944973 0.0149376)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.72 using 59 PHA bins.
# Reduced chi-squared = 0.8021 for 57 degrees of freedom
# Null hypothesis probability = 8.581044e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.449e-08 5.852e-09
25- 50 1.143e-07 2.082e-08
50-150 2.763e-07 6.236e-08
15-150 4.151e-07 6.458e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.7147 -200)
Norm : 1.60163 (-0.189074 0.189074)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.31 using 59 PHA bins.
# Reduced chi-squared = 0.7949 for 57 degrees of freedom
# Null hypothesis probability = 8.678599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.117e-08 3.435e-08
25- 50 1.177e-07 6.528e-08
50-150 2.581e-07 1.427e-07
15-150 4.369e-07 2.398e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.75927 (-2.84263 4.64235)
R1^2/D10^2 : 0.295084 (-0.233319 1.93101)
kT2 [keV] : 23.8722 (-4.9702 12.3685)
R2^2/D10^2 : 8.36326E-03 (-0.00663002 0.0113891)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.88 using 59 PHA bins.
# Reduced chi-squared = 0.6706 for 55 degrees of freedom
# Null hypothesis probability = 9.712197e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.500e-08 2.490e-08
25- 50 1.129e-07 5.962e-08
50-150 3.119e-07 1.744e-07
15-150 4.699e-07 2.456e-07
Peak spectrum fit
Power-law model
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02633 ( -0.355027 0.33064 )
Norm@50keV : 8.56837E-03 ( -0.00161202 0.00159077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 57 degrees of freedom
# Null hypothesis probability = 5.690410e-02
Photon flux (15-150 keV) in 1 sec: 0.987852 ( -0.18962 0.191244 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.18105e-08 ( -1.78507e-08 1.79603e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02760 ( -0.484113 0.328044 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 8.61551E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 56 degrees of freedom
# Null hypothesis probability = 4.728413e-02
Photon flux (15-150 keV) in 1 sec: 0.989123 ( -0.189989 0.189027 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.16458e-08 ( -1.78332e-08 1.80522e-08 ) ergs/cm2
Band function
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850929 ( 0.850929 5.67059 )
beta : -1.02636 ( 1.02636 0.355062 )
Epeak [keV] : 50.3397 ( -50.3397 -50.3397 )
Norm@50keV : 1.41829E-02 ( -0.00717325 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.902895e-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] : 23.5267 (-5.47955 8.56547)
R^2/D10^2 : 2.78851E-02 (-0.0170589 0.0374033)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.35 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.879463e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.766e-09 1.146e-09
25- 50 1.520e-08 5.911e-09
50-150 6.277e-08 2.331e-08
15-150 8.073e-08 2.824e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.5793 -200)
Norm : 4.11742 (-0.782746 0.782746)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.19 using 59 PHA bins.
# Reduced chi-squared = 1.442 for 57 degrees of freedom
# Null hypothesis probability = 1.611985e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-08 5.995e-09
25- 50 1.974e-08 1.128e-08
50-150 4.328e-08 2.468e-08
15-150 7.328e-08 4.182e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.92844 (-3.6762 11.2477)
R1^2/D10^2 : 1.38090 (-1.29166 6.91619)
kT2 [keV] : 32.4115 (-10.3637 -32.412)
R2^2/D10^2 : 9.57653E-03 (-0.00891006 0.0227953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.78 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.921215e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.836e-09 4.723e-09
25- 50 1.569e-08 8.445e-09
50-150 6.889e-08 3.934e-08
15-150 9.241e-08 4.819e-08
Plot creation:
Mon Dec 24 19:53:35 EST 2018