batgrbproduct analysis for trigger=863421
batgrbproduct Analysis for Trigger=863421
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): Wed Sep 26 16:11:34 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger863421/GCN5_download_cron
======================================================================
Trigger: 00863421 Segment: 000
BAT Trigger Time: 559579073.6 [s; MET]
Trigger Stop: 559579075.648 [s; MET]
UTC: 2018-09-25T14:37:31.949140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.213023298324 Dec: -64.4434926568184 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: NO
Rate S/N Ratio: 27.3313007374329 [ if not an image trigger ]
Image S/N Ratio: 7.58
Flight Position: [ source = BAT ]
RA: 315.213023298324 Dec: -64.4434926568184 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 315.211965235284 Dec: -64.4497771005438 [deg; J2000]
{ 21h 00m 50.9s , -64d 26' 59.2" }
+/- 1.49104294675005 [arcmin] (estimated 90% radius based on SNR)
+/- 0.642990495802214 [arcmin] (formal 1-sigma fit error)
SNR: 17.1899773607157
Angular difference between Flight and Ground position is 0.378060 arcmin
Partial Coding Fraction: 0.1542969 [ including projection effects ]
Duration
T90: 81.6999999284744 +/- 23.2520988175974
Measured from: -3.47199988365173
to: 78.2280000448227 [s; relative to TRIGTIME]
T50: 42.3600000143051 +/- 10.8805036832313
Measured from: 2.35600006580353
to: 44.7160000801086 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.868000030517578
to: 1.86800003051758 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.44000005722046
to: 103.963999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.571396 2.007282 1.708259 0.762342
0.132913 0.140366 0.123909 0.105352 [error]
Peak 0.076765 0.122846 0.118756 0.090096
0.019045 0.022179 0.020423 0.019105 [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 5.67e-07 1.02e-06 1.42e-06 4.12e-06 4.09e-06 7.14e-06 erg/cm2
Error 7.55e-08 8.06e-08 1.25e-07 8.08e-07 3.06e-07 8.82e-07 erg/cm2
Peak flux Power-law 8.69e-01 9.90e-01 8.09e-01 1.11e+00 3.07e+00 3.77e+00 ph/cm2/s
Error 3.05e-01 2.13e-01 1.64e-01 4.74e-01 5.85e-01 6.87e-01 ph/cm2/s
Fluence Cutoff-PL 5.67e-07 1.03e-06 1.42e-06 4.08e-06 4.09e-06 7.09e-06 erg/cm2
Error 5.82e-08 8.01e-08 1.26e-07 1.02e-06 3.04e-07 1.24e-06 erg/cm2
Peak flux Cutoff-PL 8.01e-01 1.01e+00 8.43e-01 8.39e-01 3.03e+00 3.50e+00 ph/cm2/s
Error 3.82e-01 2.31e-01 2.08e-01 8.45e-01 6.10e-01 7.43e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.526 0.128 - - 4.00e-03 2.82e-04 59.970 57
CPL 2.082 0.129 32.9 0.0 1.86e-03 4.16e-04 59.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.291 0.313 - - 2.58e-02 4.63e-03 61.340 57
CPL 2.212 2.845 75.7 0.0 5.21e-03 0.00e+00 59.530 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: 61.568000 sec.
T50 in the 50-300 keV band: 17.472000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 108.404 -4.440 103.964
T90 81.700 -3.472 78.228
T50 42.360 2.356 44.716
Peak 1.000 0.868 1.868
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.2120 -64.4498 0.0112 49.1 -146.9 4.3151 17.2 TRIG_00863421
------------------------------------------
Foreground time interval of the image:
-4.440 31.001 (delta_t = 35.441 [sec])
Background time interval of the image:
-239.600 -4.440 (delta_t = 235.160 [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 -4.440 sec. to 103.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52618 ( -0.1278 0.128127 )
Norm@50keV : 3.99527E-03 ( -0.000281672 0.000281341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.684704e-01
Photon flux (15-150 keV) in 108.4 sec: 0.502360 ( -0.0381486 0.038355 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09151e-06 ( -3.05326e-07 3.06467e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.440 sec. to 103.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08218 ( -0.127834 0.129694 )
Epeak [keV] : 32.8504 ( -9999.36 -9999.36 )
Norm@50keV : 1.86335E-03 ( -0.00044753 0.000384603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 56 degrees of freedom
# Null hypothesis probability = 3.562514e-01
Photon flux (15-150 keV) in 108.4 sec: 0.502626 ( -0.038553 0.037814 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09077e-06 ( -3.03997e-07 3.03758e-07 ) ergs/cm2
Band function
Time interval is from -4.440 sec. to 103.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26708 ( 1.26708 1.26708 )
beta : -1.52617 ( -0.12798 0.127809 )
Epeak [keV] : 32.2689 ( -32.2689 -32.2689 )
Norm@50keV : 7.59187E-03 ( -0.00296878 0.57366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.002558e-01
Photon flux (15-150 keV) in 108.4 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] : 16.3113 ( )
R^2/D10^2 : 4.11142E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 121.10 using 59 PHA bins.
# Reduced chi-squared = 2.1245 for 57 degrees of freedom
# Null hypothesis probability = 1.607750e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.441e-07 3.501e-08
25- 50 1.044e-06 1.059e-07
50-150 1.955e-06 2.504e-07
15-150 3.244e-06 2.938e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.967 -200)
Norm : 2.04502 (-0.144444 0.144444)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.765872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.543e-07 4.509e-08
25- 50 1.066e-06 9.707e-08
50-150 2.339e-06 5.664e-07
15-150 3.959e-06 6.173e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.59038 (-2.10466 2.22287)
R1^2/D10^2 : 0.418465 (-0.23313 0.917913)
kT2 [keV] : 31.9539 (-8.22011 20.243)
R2^2/D10^2 : 3.22078E-03 (-0.00244494 0.00599199)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.506279e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.068e-07 1.452e-07
25- 50 1.062e-06 2.603e-07
50-150 2.538e-06 1.018e-06
15-150 4.107e-06 1.279e-06
Peak spectrum fit
Power-law model
Time interval is from 0.868 sec. to 1.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29084 ( -0.314904 0.311826 )
Norm@50keV : 2.57825E-02 ( -0.0046344 0.00462462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.34 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.233591e-01
Photon flux (15-150 keV) in 1 sec: 3.07078 ( -0.583065 0.586461 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55353e-07 ( -4.86984e-08 4.89909e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.868 sec. to 1.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21150 ( -2.19669 3.49313 )
Epeak [keV] : 75.6534 ( )
Norm@50keV : 5.21073E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.53 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.485212e-01
Photon flux (15-150 keV) in 1 sec: 3.02993 ( -0.61303 0.60598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53352e-07 ( -5.0469e-08 4.9863e-08 ) ergs/cm2
Band function
Time interval is from 0.868 sec. to 1.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11972 ( 1.11981 4.74619 )
beta : -1.29084 ( -0.31195 0.315474 )
Epeak [keV] : 43.7890 ( -43.7051 -43.7051 )
Norm@50keV : 4.14213E-02 ( -0.0202561 4.09228 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.34 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 55 degrees of freedom
# Null hypothesis probability = 2.593431e-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] : 19.0162 (-3.62181 5.06831)
R^2/D10^2 : 0.166900 (-0.0925278 0.177348)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.83 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.978181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.186e-08 4.540e-09
25- 50 5.708e-08 1.775e-08
50-150 1.517e-07 5.173e-08
15-150 2.207e-07 6.070e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-66.5289 -200)
Norm : 12.9349 (-2.35114 2.35114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.537805e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.221e-08 1.860e-08
25- 50 6.196e-08 3.548e-08
50-150 1.359e-07 7.575e-08
15-150 2.301e-07 1.312e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.21214 (-1.57647 2.21214)
R1^2/D10^2 : 882.417 (-869.531 -882.415)
kT2 [keV] : 21.1840 (-4.40681 6.8469)
R2^2/D10^2 : 0.110851 (-0.0677924 0.0903665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.38 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.524321e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.833e-08 1.345e-08
25- 50 4.922e-08 1.972e-08
50-150 1.620e-07 6.317e-08
15-150 2.395e-07 8.466e-08
Plot creation:
Wed Sep 26 16:21:31 EDT 2018