batgrbproduct analysis for trigger=887217
batgrbproduct Analysis for Trigger=887217
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): Sat Feb 2 13:09:19 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger887217/batgroup_hand_proc
======================================================================
Trigger: 00887217 Segment: 000
BAT Trigger Time: 570764392.704 [s; MET]
Trigger Stop: 570764395.776 [s; MET]
UTC: 2019-02-02T01:39:30.355340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.512275970226 Dec: 9.38809738122639 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.85
Image Trigger?: NO
Rate S/N Ratio: 68.0661443009665 [ if not an image trigger ]
Image S/N Ratio: 7.85
Flight Position: [ source = BAT ]
RA: 166.512275970226 Dec: 9.38809738122639 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.505632448747 Dec: 9.39274205738321 [deg; J2000]
{ 11h 06m 01.4s , +09d 23' 33.9" }
+/- 1.86950898433068 [arcmin] (estimated 90% radius based on SNR)
+/- 0.907106049456683 [arcmin] (formal 1-sigma fit error)
SNR: 12.4433167461626
Angular difference between Flight and Ground position is 0.482000 arcmin
Partial Coding Fraction: 0.04492188 [ including projection effects ]
Duration
T90: 19.4399999380112 +/- 6.89043402235768
Measured from: -0.215999960899353
to: 19.2239999771118 [s; relative to TRIGTIME]
T50: 6.49599993228912 +/- 1.91706449097918
Measured from: 1.73600006103516
to: 8.23199999332428 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.68400001525879
to: 5.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.904000043869019
to: 26.5199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.480478 2.913094 2.893835 1.160144
0.201326 0.228932 0.213628 0.169153 [error]
Peak 0.180810 0.365172 0.350728 0.199909
0.045941 0.059895 0.060207 0.046925 [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 6.58e-07 1.35e-06 2.17e-06 7.79e-06 6.02e-06 1.20e-05 erg/cm2
Error 9.86e-08 1.26e-07 2.00e-07 1.54e-06 5.12e-07 1.66e-06 erg/cm2
Peak flux Power-law 2.29e+00 2.54e+00 2.02e+00 2.67e+00 7.84e+00 9.52e+00 ph/cm2/s
Error 6.80e-01 5.07e-01 4.38e-01 1.10e+00 1.47e+00 1.82e+00 ph/cm2/s
Fluence Cutoff-PL 5.59e-07 1.43e-06 2.36e-06 3.51e-06 5.89e-06 7.85e-06 erg/cm2
Error 1.19e-07 1.46e-07 2.47e-07 2.07e-06 3.98e-07 2.07e-06 erg/cm2
Peak flux Cutoff-PL 1.67e+00 3.09e+00 2.40e+00 6.13e-01 7.67e+00 7.78e+00 ph/cm2/s
Error 8.16e-01 7.18e-01 5.83e-01 9.50e-01 1.49e+00 1.63e+00 ph/cm2/s
Fluence Band 5.40e-07 1.47e-06 2.25e-06 5.78e-06 5.88e-06 1.01e-05 erg/cm2
Error 1.41e-07 -------- 3.12e-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 1.317 0.131 - - 2.23e-02 1.81e-03 50.190 57
CPL 0.597 0.565 109.6 80.7 4.77e-02 3.00e-02 44.530 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 1.330 0.274 - - 6.54e-02 1.22e-02 60.930 57
CPL -0.552 1.873 68.0 44.7 5.91e-01 3.67e+00 56.130 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: 10.240000 sec.
T50 in the 50-300 keV band: 4.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 27.424 -0.904 26.520
T90 19.440 -0.216 19.224
T50 6.496 1.736 8.232
Peak 1.000 4.684 5.684
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.5056 9.3927 0.0155 49.5444 141.5690 8.6139255 12.443 TRIG_00887217
Foreground time interval of the image:
-2.920 41.197 (delta_t = 44.117 [sec])
Background time interval of the image:
-64.803 -0.904 (delta_t = 63.899 [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
Time interval is from -0.904 sec. to 26.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31693 ( -0.131683 0.130607 )
Norm@50keV : 2.22922E-02 ( -0.00180587 0.00180538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.19 using 59 PHA bins.
# Reduced chi-squared = 0.8805 for 57 degrees of freedom
# Null hypothesis probability = 7.265116e-01
Photon flux (15-150 keV) in 27.42 sec: 2.66799 ( -0.229288 0.229977 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0157e-06 ( -5.11512e-07 5.126e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.904 sec. to 26.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.597194 ( -0.601836 0.528108 )
Epeak [keV] : 109.583 ( -27.1814 134.307 )
Norm@50keV : 4.76933E-02 ( -0.0199892 0.0400554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.53 using 59 PHA bins.
# Reduced chi-squared = 0.7952 for 56 degrees of freedom
# Null hypothesis probability = 8.652122e-01
Photon flux (15-150 keV) in 27.42 sec: 2.60059 ( -0.23417 0.23488 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88872e-06 ( -2.66769e-07 5.29809e-07 ) ergs/cm2
Band function
Time interval is from -0.904 sec. to 26.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.597446 ( -0.450705 0.73275 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 109.585 ( -22.1398 135.129 )
Norm@50keV : 4.76803E-02 ( -0.0199783 0.0400026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.53 using 59 PHA bins.
# Reduced chi-squared = 0.8096 for 55 degrees of freedom
# Null hypothesis probability = 8.425865e-01
Photon flux (15-150 keV) in 27.42 sec: 0.127799 ( 6.8722 -0.025389 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.878e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5940 (-1.76977 2.00296)
R^2/D10^2 : 0.156453 (-0.0466838 0.0646837)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.679358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.938e-07 4.851e-08
25- 50 1.391e-06 1.708e-07
50-150 3.519e-06 4.511e-07
15-150 5.205e-06 5.361e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.9536 -200)
Norm : 11.3124 (-0.922577 0.922577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 0.9979 for 57 degrees of freedom
# Null hypothesis probability = 4.794840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.723e-07 7.321e-08
25- 50 1.486e-06 1.649e-07
50-150 3.258e-06 1.040e-06
15-150 5.516e-06 1.279e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.18022 (-2.30675 2.90977)
R1^2/D10^2 : 1.30575 (-0.768404 2.55322)
kT2 [keV] : 27.8680 (-5.28797 10.656)
R2^2/D10^2 : 3.16945E-02 (-0.0219723 0.022098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.85 using 59 PHA bins.
# Reduced chi-squared = 0.7791 for 55 degrees of freedom
# Null hypothesis probability = 8.833062e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.506e-07 2.727e-07
25- 50 1.460e-06 5.424e-07
50-150 3.936e-06 1.729e-06
15-150 5.947e-06 2.268e-06
Peak spectrum fit
Power-law model
Time interval is from 4.684 sec. to 5.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32978 ( -0.273236 0.275457 )
Norm@50keV : 6.53545E-02 ( -0.0121772 0.0121482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.365377e-01
Photon flux (15-150 keV) in 1 sec: 7.84142 ( -1.46564 1.46712 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41246e-07 ( -1.29836e-07 1.31003e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.684 sec. to 5.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.551657 ( -2.23518 1.51002 )
Epeak [keV] : 68.0123 ( -15.0209 74.3373 )
Norm@50keV : 0.590658 ( -0.590817 6.73999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.13 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.698995e-01
Photon flux (15-150 keV) in 1 sec: 7.66797 ( -1.49267 1.48968 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94309e-07 ( -1.3351e-07 1.39795e-07 ) ergs/cm2
Band function
Time interval is from 4.684 sec. to 5.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.812276 ( -1.63059 -0.812037 )
beta : -2.71647 ( 2.57819 1.13446 )
Epeak [keV] : 64.3643 ( -27.9988 55.6295 )
Norm@50keV : 0.819564 ( -0.859352 195.352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.521296e-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] : 15.9122 (-2.55824 3.17941)
R^2/D10^2 : 0.850228 (-0.406234 0.702859)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 0.9962 for 57 degrees of freedom
# Null hypothesis probability = 4.831050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.457e-08 1.434e-08
25- 50 1.866e-07 5.055e-08
50-150 3.296e-07 1.190e-07
15-150 5.608e-07 1.387e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-75.2672 -200)
Norm : 32.6827 (-6.04458 6.04458)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.19 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.281483e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.139e-08 4.682e-08
25- 50 1.566e-07 8.965e-08
50-150 3.434e-07 2.011e-07
15-150 5.813e-07 3.344e-07
Double BB
R1^2/D10^2 : 4.70867E-04 (-0.000470308 -0.000470308)
kT2 [keV] : 14.1551 (-2.7792 3.84274)
R2^2/D10^2 : 1.15384 (-0.614438 0.337491)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.501251e-01
# Null hypothesis probability = 4.575593e-01
# Null hypothesis probability = 4.613092e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.121e-08 3.390e-08
25- 50 1.865e-07 1.441e-07
50-150 3.740e-07 3.083e-07
15-150 6.118e-07 4.711e-07
Plot creation:
Sat Feb 2 13:27:48 EST 2019