batgrbproduct analysis for trigger=869494
batgrbproduct Analysis for Trigger=869494
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): Tue Oct 30 15:53:09 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger869494/batgroup_hand_proc
======================================================================
Trigger: 00869494 Segment: 000
BAT Trigger Time: 562555664 [s; MET]
Trigger Stop: 562555728 [s; MET]
UTC: 2018-10-30T01:27:22.164360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 146.922199813726 Dec: 14.6579611316373 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.58
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.58
Flight Position: [ source = BAT ]
RA: 146.922199813726 Dec: 14.6579611316373 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 146.915884820881 Dec: 14.6573546197057 [deg; J2000]
{ 09h 47m 39.8s , +14d 39' 26.5" }
+/- 1.08111990097496 [arcmin] (estimated 90% radius based on SNR)
+/- 0.386365672372561 [arcmin] (formal 1-sigma fit error)
SNR: 27.2099127278922
Angular difference between Flight and Ground position is 0.368370 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 304.715999960899 +/- 76.9219995764126
Measured from: 18.3919999599457
to: 323.107999920845 [s; relative to TRIGTIME]
T50: 99.3639998435974 +/- 12.2019435661359
Measured from: 51.7640000581741
to: 151.127999901772 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 71.3279999494553
to: 72.3279999494553 [s; relative to TRIGTIME]
Total Fluence
Measured from: 3.19200003147125
to: 442.988000035286 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.178982 4.113259 2.679354 0.567632
0.153001 0.158658 0.137442 0.116804 [error]
Peak 0.040717 0.023682 0.031526 0.026195
0.008379 0.009045 0.007788 0.006439 [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 1.11e-06 1.74e-06 2.04e-06 4.62e-06 6.24e-06 9.51e-06 erg/cm2
Error 8.82e-08 8.35e-08 1.36e-07 6.51e-07 3.19e-07 7.60e-07 erg/cm2
Peak flux Power-law 2.82e-01 2.81e-01 1.97e-01 2.18e-01 8.46e-01 9.78e-01 ph/cm2/s
Error 1.26e-01 7.60e-02 6.49e-02 1.55e-01 2.15e-01 2.47e-01 ph/cm2/s
Fluence Cutoff-PL 1.04e-06 1.81e-06 2.07e-06 2.48e-06 6.03e-06 7.41e-06 erg/cm2
Error 1.06e-07 1.03e-07 1.45e-07 1.27e-06 3.63e-07 1.31e-06 erg/cm2
Peak flux Cutoff-PL 2.95e-01 2.84e-01 1.91e-01 2.00e-01 8.51e-01 9.69e-01 ph/cm2/s
Error 1.27e-01 7.65e-02 -------- 2.03e-01 2.15e-01 2.86e-01 ph/cm2/s
Fluence Band 1.00e-06 1.84e-06 2.00e-06 3.89e-06 6.08e-06 8.75e-06 erg/cm2
Error 1.18e-07 -------- 1.43e-07 -------- -------- -------- 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 1.770 0.086 - - 1.54e-03 7.63e-05 67.270 57
CPL 1.345 0.363 74.6 60.1 2.55e-03 1.12e-03 62.850 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 1.516 0.483 - - 6.75e-03 1.74e-03 49.060 57
CPL 2.049 0.022 19.6 0.0 3.50e-03 0.00e+00 48.910 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: 149.248000 sec.
T50 in the 50-300 keV band: 64.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 439.796 3.192 442.988
T90 304.716 18.392 323.108
T50 99.364 51.764 151.128
Peak 1.000 71.328 72.328
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
146.9159 14.6574 0.0070 35.7684 -6.4820 4.1688927 27.210 TRIG_00869494
Foreground time interval of the image:
3.192 72.501 (delta_t = 69.309 [sec])
Background time interval of the image:
-217.899 3.192 (delta_t = 221.091 [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 3.192 sec. to 442.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76997 ( -0.085432 0.0864501 )
Norm@50keV : 1.54031E-03 ( -7.65131e-05 7.61388e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.27 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.657538e-01
Photon flux (15-150 keV) in 439.8 sec: 0.209831 ( -0.0102685 0.0102907 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24428e-06 ( -3.18504e-07 3.1987e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.192 sec. to 442.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34457 ( -0.377292 0.348033 )
Epeak [keV] : 74.5561 ( -15.7122 104.456 )
Norm@50keV : 2.54970E-03 ( -0.000844181 0.00140582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.465378e-01
Photon flux (15-150 keV) in 439.8 sec: 0.204748 ( -0.011015 0.011031 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.03441e-06 ( -3.62879e-07 3.62923e-07 ) ergs/cm2
Band function
Time interval is from 3.192 sec. to 442.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.557976 ( -2.05905 3.94044 )
beta : -1.92559 ( 1.90801 0.142339 )
Epeak [keV] : 41.8927 ( -12.097 93.2164 )
Norm@50keV : 8.58646E-03 ( -0.00859829 18.9516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.13 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.371231e-01
Photon flux (15-150 keV) in 439.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07549e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8773 ( )
R^2/D10^2 : 3.80914E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 155.04 using 59 PHA bins.
# Reduced chi-squared = 2.7201 for 57 degrees of freedom
# Null hypothesis probability = 5.237087e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.892e-07 4.706e-08
25- 50 2.009e-06 1.174e-07
50-150 2.094e-06 2.195e-07
15-150 4.692e-06 2.551e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.614 (-23.0158 25.3104)
Norm : 0.878759 (-0.053402 0.0704702)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.03 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.715638e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.007e-06 8.356e-08
25- 50 1.798e-06 1.130e-07
50-150 3.190e-06 8.583e-07
15-150 5.996e-06 9.742e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76534 (-1.03549 1.12603)
R1^2/D10^2 : 0.268849 (-0.107219 0.213187)
kT2 [keV] : 22.8290 (-3.39633 5.34497)
R2^2/D10^2 : 3.40128E-03 (-0.00189277 0.0031225)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.76 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.956456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.798e-07 1.836e-07
25- 50 1.839e-06 2.360e-07
50-150 3.140e-06 7.175e-07
15-150 5.959e-06 9.271e-07
Peak spectrum fit
Power-law model
Time interval is from 71.328 sec. to 72.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51648 ( -0.479195 0.487646 )
Norm@50keV : 6.74836E-03 ( -0.00177148 0.00171785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.06 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 57 degrees of freedom
# Null hypothesis probability = 7.637355e-01
Photon flux (15-150 keV) in 1 sec: 0.846230 ( -0.215306 0.215679 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.38485e-08 ( -1.79917e-08 1.82574e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 71.328 sec. to 72.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04903 ( -0.0283568 0.0159316 )
Epeak [keV] : 19.5845 ( )
Norm@50keV : 3.49799E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.91 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 56 degrees of freedom
# Null hypothesis probability = 7.380214e-01
Photon flux (15-150 keV) in 1 sec: 0.851161 ( -0.218236 0.211719 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36656e-08 ( -1.78193e-08 1.78401e-08 ) ergs/cm2
Band function
Time interval is from 71.328 sec. to 72.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13160 ( 1.12965 1.12965 )
beta : -1.52288 ( 1.52267 0.48429 )
Epeak [keV] : 47.3818 ( -48.1407 -48.1407 )
Norm@50keV : 1.39309E-02 ( -0.0140723 1.17482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8918 for 55 degrees of freedom
# Null hypothesis probability = 7.003074e-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] : 15.0881 (-5.6301 10.4369)
R^2/D10^2 : 8.80014E-02 (-0.085967 0.366358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.310132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.190e-09 2.609e-09
25- 50 1.674e-08 1.011e-08
50-150 2.600e-08 1.698e-08
15-150 4.693e-08 2.401e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-124.569 -199.363)
Norm : 3.43897 (-0.859079 0.859267)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.88 using 59 PHA bins.
# Reduced chi-squared = 0.8751 for 57 degrees of freedom
# Null hypothesis probability = 7.368724e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.563e-09 5.270e-09
25- 50 1.647e-08 9.620e-09
50-150 3.613e-08 2.136e-08
15-150 6.116e-08 3.556e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.45786 (-2.13918 5.02274)
R1^2/D10^2 : 2.91464 (-2.67324 23.1693)
kT2 [keV] : 37.6822 (-19.0705 -37.787)
R2^2/D10^2 : 3.89524E-03 (-0.00376753 0.0321823)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.08 using 59 PHA bins.
# Reduced chi-squared = 0.8742 for 55 degrees of freedom
# Null hypothesis probability = 7.340413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.068e-08 6.690e-09
25- 50 1.299e-08 7.570e-09
50-150 4.468e-08 2.767e-08
15-150 6.836e-08 3.526e-08
Plot creation:
Tue Oct 30 16:02:24 EDT 2018