batgrbproduct analysis for trigger=866783
batgrbproduct Analysis for Trigger=866783
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): Sun Oct 14 06:56:16 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger866783/GCN5_download_cron
======================================================================
Trigger: 00866783 Segment: 000
BAT Trigger Time: 561091191.424 [s; MET]
Trigger Stop: 561091193.472 [s; MET]
UTC: 2018-10-13T02:39:29.679300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.600644048683 Dec: 40.1787286370108 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: NO
Rate S/N Ratio: 7.54983443527075 [ if not an image trigger ]
Image S/N Ratio: 7.72
Flight Position: [ source = BAT ]
RA: 207.600644048683 Dec: 40.1787286370108 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.660536864456 Dec: 40.1074362203746 [deg; J2000]
{ 13h 50m 38.5s , +40d 06' 26.8" }
+/- 3.25973320194414 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52127239465195 [arcmin] (formal 1-sigma fit error)
SNR: 5.62342823490508
Angular difference between Flight and Ground position is 5.083671 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 104.063999891281 +/- 53.5108130191833
Measured from: 18.9440001249313
to: 123.008000016212 [s; relative to TRIGTIME]
T50: 40.4479998350143 +/- 55.2431321897961
Measured from: 20.9280000925064
to: 61.3759999275208 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.7960000038147
to: 19.7960000038147 [s; relative to TRIGTIME]
Total Fluence
Measured from: 18.3680000305176
to: 123.96799993515 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.181947 0.169896 0.179192 0.015057
0.064613 0.066937 0.058071 0.050903 [error]
Peak 0.010906 0.025200 0.019874 0.004810
0.007209 0.007375 0.006492 0.005339 [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 5.60e-08 8.49e-08 9.64e-08 2.09e-07 3.00e-07 4.46e-07 erg/cm2
Error 2.88e-08 3.02e-08 5.83e-08 2.93e-07 1.35e-07 3.32e-07 erg/cm2
Peak flux Power-law 1.74e-01 1.72e-01 1.19e-01 1.29e-01 5.16e-01 5.94e-01 ph/cm2/s
Error 9.29e-02 6.04e-02 5.10e-02 1.12e-01 1.75e-01 2.03e-01 ph/cm2/s
Fluence Cutoff-PL 5.47e-08 8.55e-08 9.82e-08 1.70e-07 2.99e-07 3.94e-07 erg/cm2
Error 4.29e-08 3.40e-08 8.16e-08 2.92e-07 1.35e-07 3.35e-07 erg/cm2
Peak flux Cutoff-PL 1.38e-01 1.93e-01 1.31e-01 4.17e-02 4.94e-01 5.04e-01 ph/cm2/s
Error 1.09e-01 7.64e-02 6.29e-02 1.19e-01 1.80e-01 2.21e-01 ph/cm2/s
Fluence Band 5.10e-08 8.74e-08 1.03e-07 1.60e-07 3.03e-07 4.04e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.816 0.750 - - 3.08e-04 1.39e-04 58.430 57
CPL 1.593 1.562 95.7 0.0 3.99e-04 0.00e+00 58.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.534 0.572 - - 4.10e-03 1.44e-03 52.490 57
CPL 0.239 3.089 67.7 0.0 1.85e-02 9.20e-01 51.600 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 105.600 18.368 123.968
T90 104.064 18.944 123.008
T50 40.448 20.928 61.376
Peak 1.000 18.796 19.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.6605 +40.1074 0.0342 25.1 -140.2 0.2364 5.6 TRIG_00866783
------------------------------------------
Foreground time interval of the image:
18.368 27.377 (delta_t = 9.009 [sec])
Background time interval of the image:
-105.123 18.368 (delta_t = 123.491 [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 18.368 sec. to 123.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81562 ( -0.660137 0.839718 )
Norm@50keV : 3.08369E-04 ( -0.000148074 0.000130646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.225553e-01
Photon flux (15-150 keV) in 105.6 sec: 4.27527E-02 ( -0.015141 0.0151413 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99633e-07 ( -1.30734e-07 1.38724e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.368 sec. to 123.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59261 ( -2.39502 0.729908 )
Epeak [keV] : 95.6502 ( )
Norm@50keV : 3.98838E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.858413e-01
Photon flux (15-150 keV) in 105.6 sec: 4.26586E-02 ( -0.0151266 0.015192 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99058e-07 ( -1.31662e-07 1.38518e-07 ) ergs/cm2
Band function
Time interval is from 18.368 sec. to 123.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71986 ( -0.279766 2.10153 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 161.737 ( -143.893 -161.276 )
Norm@50keV : 3.43046E-04 ( -0.000121365 0.00462933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.506161e-01
Photon flux (15-150 keV) in 105.6 sec: 4.20791E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11957e-18 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.9335 (-9.59669 10.1416)
R^2/D10^2 : 3.01378E-03 (-0.00300177 0.0540378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.01 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.020448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.861e-08 1.215e-08
25- 50 8.206e-08 5.190e-08
50-150 1.678e-07 1.155e-07
15-150 2.685e-07 1.722e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9153 (-99.9957 -99.9957)
Norm : 0.188597 (-0.0764613 0.12702)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.155192e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.205e-08 3.357e-08
25- 50 8.999e-08 5.676e-08
50-150 1.458e-07 1.176e-07
15-150 2.878e-07 2.078e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.53205 (-2.09237 3.76042)
R1^2/D10^2 : 1.00157 (-0.967935 507.526)
kT2 [keV] : 21.8334 (-8.38762 18.2536)
R2^2/D10^2 : 1.10517E-03 (-0.000959386 0.00466491)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.19 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.299188e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.124e-08 3.462e-08
25- 50 6.708e-08 3.737e-08
50-150 1.937e-07 1.322e-07
15-150 3.221e-07 1.834e-07
Peak spectrum fit
Power-law model
Time interval is from 18.796 sec. to 19.796 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53380 ( -0.554787 0.588623 )
Norm@50keV : 4.09591E-03 ( -0.00145272 0.0014181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.49 using 59 PHA bins.
# Reduced chi-squared = 0.9208 for 57 degrees of freedom
# Null hypothesis probability = 6.448049e-01
Photon flux (15-150 keV) in 1 sec: 0.516119 ( -0.175039 0.175665 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86502e-08 ( -1.43283e-08 1.48145e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.796 sec. to 19.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.239385 ( -3.9697 2.20891 )
Epeak [keV] : 67.7027 ( -67.7029 -67.7029 )
Norm@50keV : 1.85232E-02 ( -0.018523 1.82109 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.60 using 59 PHA bins.
# Reduced chi-squared = 0.9214 for 56 degrees of freedom
# Null hypothesis probability = 6.420142e-01
Photon flux (15-150 keV) in 1 sec: 0.493844 ( -0.179996 0.180574 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5955e-08 ( -1.41465e-08 1.56019e-08 ) ergs/cm2
Band function
Time interval is from 18.796 sec. to 19.796 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.246368 ( -1.72327 3.48954 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 69.6672 ( -49.5759 215.54 )
Norm@50keV : 1.78059E-02 ( -0.0177742 112.017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.61 using 59 PHA bins.
# Reduced chi-squared = 0.9383 for 55 degrees of freedom
# Null hypothesis probability = 6.051312e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7485e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9568 (-4.86069 7.3062)
R^2/D10^2 : 6.20190E-02 (-0.0620182 0.184745)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9192 for 57 degrees of freedom
# Null hypothesis probability = 6.482103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.906e-09 1.889e-09
25- 50 1.152e-08 7.065e-09
50-150 1.751e-08 1.184e-08
15-150 3.193e-08 2.032e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 191.358 (-135.482 -189.344)
Norm : 2.13392 (-0.712893 0.989999)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9140 for 57 degrees of freedom
# Null hypothesis probability = 6.591751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.342e-09 3.332e-09
25- 50 1.023e-08 6.205e-09
50-150 2.212e-08 1.332e-08
15-150 3.769e-08 2.264e-08
Double BB
# Reduced chi-squared = 0.9284 for 55 degrees of freedom
# Reduced chi-squared = 0.9276 for 55 degrees of freedom
# Reduced chi-squared = 0.9271 for 55 degrees of freedom
# Reduced chi-squared = 0.9268 for 55 degrees of freedom
# Null hypothesis probability = 6.077318e-01
# Null hypothesis probability = 6.086041e-01
# Null hypothesis probability = 6.142228e-01
# Null hypothesis probability = 6.182719e-01
# Null hypothesis probability = 6.226900e-01
# Null hypothesis probability = 6.257893e-01
# Null hypothesis probability = 6.275948e-01
# Null hypothesis probability = 6.285885e-01
# Null hypothesis probability = 6.291018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.434e-09 2.720e-09
25- 50 1.081e-08 6.210e-09
50-150 2.055e-08 1.290e-08
15-150 3.579e-08 2.077e-08
Plot creation:
Sun Oct 14 07:01:16 EDT 2018