batgrbproduct analysis for trigger=843211
batgrbproduct Analysis for Trigger=843211
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): Thu Jun 21 19:29:45 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger843211/GCN5_download_cron
======================================================================
Trigger: 00843211 Segment: 000
BAT Trigger Time: 551202658.304 [s; MET]
Trigger Stop: 551202659.328 [s; MET]
UTC: 2018-06-20T15:50:37.167500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 357.516541175609 Dec: -57.9572576503267 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.36
Image Trigger?: NO
Rate S/N Ratio: 59.042357676502 [ if not an image trigger ]
Image S/N Ratio: 16.36
Flight Position: [ source = BAT ]
RA: 357.516541175609 Dec: -57.9572576503267 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 357.513904796598 Dec: -57.9537536146624 [deg; J2000]
{ 23h 50m 03.3s , -57d 57' 13.5" }
+/- 0.795682862096447 [arcmin] (estimated 90% radius based on SNR)
+/- 0.28488682514202 [arcmin] (formal 1-sigma fit error)
SNR: 42.1617252855195
Angular difference between Flight and Ground position is 0.226375 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 198.803999900818 +/- 27.4443117973296
Measured from: -93.191999912262
to: 105.611999988556 [s; relative to TRIGTIME]
T50: 43.1799999475479 +/- 3.5178470475007
Measured from: -2.7279999256134
to: 40.4520000219345 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.332000017166138
to: 0.667999982833862 [s; relative to TRIGTIME]
Total Fluence
Measured from: -159.37600004673
to: 162.427999973297 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.563281 6.259467 4.578315 1.094220
0.120394 0.120896 0.103724 0.088821 [error]
Peak 0.078855 0.160658 0.163507 0.052668
0.008319 0.009438 0.009204 0.006771 [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 1.54e-06 2.66e-06 3.50e-06 9.38e-06 1.03e-05 1.71e-05 erg/cm2
Error 7.75e-08 7.68e-08 1.09e-07 6.67e-07 2.65e-07 7.22e-07 erg/cm2
Peak flux Power-law 8.68e-01 1.12e+00 1.05e+00 1.73e+00 3.61e+00 4.76e+00 ph/cm2/s
Error 1.08e-01 8.49e-02 7.05e-02 2.50e-01 2.30e-01 3.12e-01 ph/cm2/s
Fluence Cutoff-PL 1.43e-06 2.71e-06 3.59e-06 6.30e-06 1.00e-05 1.40e-05 erg/cm2
Error 1.00e-07 8.33e-08 1.21e-07 1.52e-06 3.00e-07 1.54e-06 erg/cm2
Peak flux Cutoff-PL 8.08e-01 1.13e+00 1.08e+00 1.33e+00 3.58e+00 4.35e+00 ph/cm2/s
Error 1.33e-01 9.07e-02 8.90e-02 4.66e-01 2.36e-01 5.40e-01 ph/cm2/s
Fluence Band 1.37e-06 2.75e-06 3.50e-06 8.38e-06 1.00e-05 1.60e-05 erg/cm2
Error -------- -------- 1.49e-07 -------- 2.93e-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 1.604 0.048 - - 3.43e-03 8.55e-05 65.760 57
CPL 1.296 0.196 123.9 68.3 4.75e-03 9.75e-04 58.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.091 0.106 - - 3.12e-02 1.93e-03 55.200 57
CPL 0.818 0.323 250.7 0.0 4.12e-02 1.66e-02 53.830 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: 165.312000 sec.
T50 in the 50-300 keV band: 34.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 321.804 -159.376 162.428
T90 198.804 -93.192 105.612
T50 43.180 -2.728 40.452
Peak 1.000 -0.332 0.668
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
357.5139 -57.9538 0.0046 30.4 -176.7 9.8801 42.2 TRIG_00843211
------------------------------------------
Foreground time interval of the image:
-158.203 -54.351 (delta_t = 103.852 [sec])
-53.304 14.897 (delta_t = 68.201 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-159.376000 -54.351300
-53.304000 56.906000
57.696000 162.428000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60395 ( -0.0476707 0.0477024 )
Norm@50keV : 3.42777E-03 ( -8.54922e-05 8.5486e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.995608e-01
Photon flux (15-150 keV) in 320 sec: 0.441025 ( -0.0124888 0.0125362 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02533e-05 ( -2.65074e-07 2.6534e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-159.376000 -54.351300
-53.304000 56.906000
57.696000 162.428000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29632 ( -0.200345 0.191794 )
Epeak [keV] : 123.945 ( -28.5345 108.14 )
Norm@50keV : 4.75243E-03 ( -0.000855176 0.00109563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 56 degrees of freedom
# Null hypothesis probability = 3.983209e-01
Photon flux (15-150 keV) in 320 sec: 0.430111 ( -0.013982 0.014056 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0034e-05 ( -3.00288e-07 2.9888e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-159.376000 -54.351300
-53.304000 56.906000
57.696000 162.428000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834319 ( -0.63789 1.4573 )
beta : -1.71468 ( 1.715 0.090504 )
Epeak [keV] : 61.5130 ( -27.665 147.656 )
Norm@50keV : 9.16651E-03 ( -0.00488506 0.0930322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.776929e-01
Photon flux (15-150 keV) in 320 sec: 0.426389 ( 6.57361 -0.015166 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00322e-05 ( -1.003e-05 -2.93312e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8729 ( )
R^2/D10^2 : 3.81994E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 363.68 using 59 PHA bins.
# Reduced chi-squared = 6.3804 for 57 degrees of freedom
# Null hypothesis probability = 3.028124e-46
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.379e-07 3.152e-08
25- 50 2.666e-06 9.056e-08
50-150 4.680e-06 1.952e-07
15-150 7.984e-06 2.400e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 191.736 (-25.5594 -191.736)
Norm : 1.77025 (-0.049456 0.0543569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.05 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.363382e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.418e-06 7.024e-08
25- 50 2.715e-06 1.546e-07
50-150 5.876e-06 1.310e-06
15-150 1.001e-05 1.427e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.58402 (-0.700684 0.737806)
R1^2/D10^2 : 0.342677 (-0.0913532 0.137102)
kT2 [keV] : 26.8763 (-2.38909 3.0936)
R2^2/D10^2 : 4.59037E-03 (-0.00151973 0.00194902)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.42 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.570600e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-06 9.904e-08
25- 50 2.781e-06 1.517e-07
50-150 5.882e-06 4.496e-07
15-150 9.933e-06 5.264e-07
Peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09127 ( -0.106663 0.105495 )
Norm@50keV : 3.11672E-02 ( -0.00192722 0.00192347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9684 for 57 degrees of freedom
# Null hypothesis probability = 5.430407e-01
Photon flux (15-150 keV) in 1 sec: 3.61218 ( -0.23023 0.23059 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26775e-07 ( -2.17027e-08 2.17537e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.817851 ( -0.4337 0.211827 )
Epeak [keV] : 250.702 ( -250.702 -250.702 )
Norm@50keV : 4.12476E-02 ( -0.0112592 0.0219942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9613 for 56 degrees of freedom
# Null hypothesis probability = 5.573500e-01
Photon flux (15-150 keV) in 1 sec: 3.57529 ( -0.23612 0.23636 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23776e-07 ( -2.2492e-08 2.239e-08 ) ergs/cm2
Band function
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.818009 ( -1.41968 -1.41968 )
beta : -9.99996 ( 9.99968 19.9997 )
Epeak [keV] : 250.357 ( -118.17 -250.355 )
Norm@50keV : 4.12584E-02 ( -0.0128564 0.0220213 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9788 for 55 degrees of freedom
# Null hypothesis probability = 5.192940e-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] : 21.5504 (-1.75102 1.96329)
R^2/D10^2 : 0.135879 (-0.0331275 0.0427174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.83 using 59 PHA bins.
# Reduced chi-squared = 1.7689 for 57 degrees of freedom
# Null hypothesis probability = 3.093973e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.179e-08 1.560e-09
25- 50 6.157e-08 5.615e-09
50-150 2.135e-07 2.175e-08
15-150 2.868e-07 2.170e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.24994 -200)
Norm : 14.9283 (-0.948452 0.948452)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.74 using 59 PHA bins.
# Reduced chi-squared = 1.8726 for 57 degrees of freedom
# Null hypothesis probability = 7.296328e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.718e-08 2.525e-09
25- 50 7.153e-08 6.410e-09
50-150 1.569e-07 4.252e-08
15-150 2.656e-07 4.165e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17193 (-1.74245 2.12129)
R1^2/D10^2 : 1.63601 (-0.817871 1.93759)
kT2 [keV] : 33.4492 (-5.51391 9.68812)
R2^2/D10^2 : 2.86069E-02 (-0.0157415 0.0234646)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.85 using 59 PHA bins.
# Reduced chi-squared = 0.9427 for 55 degrees of freedom
# Null hypothesis probability = 5.958418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.473e-08 7.375e-09
25- 50 6.648e-08 1.648e-08
50-150 2.361e-07 6.195e-08
15-150 3.273e-07 7.920e-08
Plot creation:
Thu Jun 21 19:34:16 EDT 2018