batgrbproduct analysis for trigger=859421
batgrbproduct Analysis for Trigger=859421
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 Sep 6 10:17:56 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger859421/batgroup_hand_proc
======================================================================
Trigger: 00859421 Segment: 000
BAT Trigger Time: 557848688 [s; MET]
Trigger Stop: 557848752 [s; MET]
UTC: 2018-09-05T13:57:46.456140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 91.0352587911709 Dec: -4.59128989702066 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.32
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.32
Flight Position: [ source = BAT ]
RA: 91.0352587911709 Dec: -4.59128989702066 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 91.0383700527125 Dec: -4.59218787784411 [deg; J2000]
{ 06h 04m 09.2s , -04d 35' 31.9" }
+/- 1.70293470500395 [arcmin] (estimated 90% radius based on SNR)
+/- 0.625917281207332 [arcmin] (formal 1-sigma fit error)
SNR: 14.2179023834398
Angular difference between Flight and Ground position is 0.193720 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 165.34399998188 +/- 28.8994952744125
Measured from: -47.2599999904633
to: 118.083999991417 [s; relative to TRIGTIME]
T50: 55.067999958992 +/- 10.514913720399
Measured from: -22.0479999780655
to: 33.0199999809265 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.09200000762939
to: -1.09200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -58.932000041008
to: 146.659999966621 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.730808 2.435526 1.881047 0.411693
0.141017 0.147103 0.128729 0.114850 [error]
Peak 0.024613 0.037357 0.040866 0.017095
0.011616 0.011736 0.010400 0.008847 [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 6.36e-07 1.10e-06 1.45e-06 3.87e-06 4.23e-06 7.05e-06 erg/cm2
Error 7.38e-08 7.77e-08 1.28e-07 7.33e-07 3.09e-07 8.30e-07 erg/cm2
Peak flux Power-law 3.18e-01 3.17e-01 2.21e-01 2.45e-01 9.53e-01 1.10e+00 ph/cm2/s
Error 1.66e-01 1.07e-01 8.04e-02 1.81e-01 3.04e-01 3.35e-01 ph/cm2/s
Fluence Cutoff-PL 5.92e-07 1.14e-06 1.49e-06 2.16e-06 4.11e-06 5.38e-06 erg/cm2
Error 8.78e-08 9.38e-08 1.40e-07 -------- 3.37e-07 1.36e-06 erg/cm2
Peak flux Cutoff-PL 2.82e-01 3.34e-01 2.37e-01 1.39e-01 9.33e-01 9.90e-01 ph/cm2/s
Error 1.91e-01 1.22e-01 9.48e-02 1.90e-01 3.09e-01 3.79e-01 ph/cm2/s
Fluence Band 5.67e-07 1.17e-06 1.43e-06 3.31e-06 4.14e-06 6.52e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.84e-01 3.33e-01 2.36e-01 1.41e-01 9.34e-01 9.95e-01 ph/cm2/s
Error -------- -------- -------- -------- 2.99e-01 3.81e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.603 0.118 - - 2.20e-03 1.51e-04 68.440 57
CPL 1.188 0.479 98.7 -34.3 3.55e-03 2.07e-03 66.030 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 1.518 0.516 - - 7.60e-03 2.33e-03 54.590 57
CPL 0.913 1.890 94.8 0.0 1.50e-02 8.47e-02 54.210 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: 83.200000 sec.
T50 in the 50-300 keV band: 38.464000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 205.592 -58.932 146.660
T90 165.344 -47.260 118.084
T50 55.068 -22.048 33.020
Peak 1.000 -2.092 -1.092
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
91.0384 -4.5922 0.0135 42.8595 162.2173 3.5341083 14.218 TRIG_00859421
Foreground time interval of the image:
-12.499 72.101 (delta_t = 84.600 [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
Time interval is from -58.932 sec. to 146.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60278 ( -0.117297 0.118238 )
Norm@50keV : 2.20034E-03 ( -0.000151096 0.000150611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.44 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.425992e-01
Photon flux (15-150 keV) in 205.6 sec: 0.282997 ( -0.0197922 0.0198372 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22938e-06 ( -3.08184e-07 3.09648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -58.932 sec. to 146.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18764 ( -0.507268 0.451655 )
Epeak [keV] : 98.7022 ( -30.0775 -98.7022 )
Norm@50keV : 3.55310E-03 ( -0.00139949 0.00273826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.688393e-01
Photon flux (15-150 keV) in 205.6 sec: 0.277262 ( -0.020736 0.020762 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1127e-06 ( -3.37225e-07 3.36691e-07 ) ergs/cm2
Band function
Time interval is from -58.932 sec. to 146.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18753 ( -0.352299 0.399701 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 98.6756 ( -24.0222 -98.6756 )
Norm@50keV : 3.55311E-03 ( -0.00139996 0.00273883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.465416e-01
Photon flux (15-150 keV) in 205.6 sec: 0.277099 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13951e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.5395 (-1.21847 1.34198)
R^2/D10^2 : 3.47821E-02 (-0.00951263 0.0129836)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.40 using 59 PHA bins.
# Reduced chi-squared = 1.9895 for 57 degrees of freedom
# Null hypothesis probability = 1.305567e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.180e-07 4.153e-08
25- 50 1.227e-06 1.110e-07
50-150 1.740e-06 2.223e-07
15-150 3.285e-06 2.806e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.269 (-50.1879 -176.595)
Norm : 1.15431 (-0.0848085 0.0957991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.919200e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.995e-07 6.199e-08
25- 50 1.137e-06 2.532e-07
50-150 2.394e-06 9.916e-07
15-150 4.130e-06 1.437e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.10806 (-1.39561 1.60171)
R1^2/D10^2 : 0.286042 (-0.138153 0.323915)
kT2 [keV] : 25.1737 (-4.60956 8.19636)
R2^2/D10^2 : 3.74598E-03 (-0.00239787 0.00248459)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.78 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 55 degrees of freedom
# Null hypothesis probability = 1.722422e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.693e-07 1.618e-07
25- 50 1.165e-06 3.026e-07
50-150 2.377e-06 9.150e-07
15-150 4.112e-06 1.155e-06
Peak spectrum fit
Power-law model
Time interval is from -2.092 sec. to -1.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51796 ( -0.514569 0.516879 )
Norm@50keV : 7.59880E-03 ( -0.00233441 0.00232394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9578 for 57 degrees of freedom
# Null hypothesis probability = 5.659497e-01
Photon flux (15-150 keV) in 1 sec: 0.953279 ( -0.302136 0.304952 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18798e-08 ( -2.3167e-08 2.35009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.092 sec. to -1.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.912642 ( -2.36845 1.41251 )
Epeak [keV] : 94.8386 ( -94.9411 -94.9411 )
Norm@50keV : 1.49821E-02 ( -0.00949802 0.159859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9680 for 56 degrees of freedom
# Null hypothesis probability = 5.430154e-01
Photon flux (15-150 keV) in 1 sec: 0.932712 ( -0.308012 0.310048 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01254e-08 ( -2.38138e-08 1.23641e-08 ) ergs/cm2
Band function
Time interval is from -2.092 sec. to -1.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.05341 ( -1.07031 2.31886 )
beta : -1.75861 ( 9.37145 19.3715 )
Epeak [keV] : 29.6810 ( -31.7398 -99.1687 )
Norm@50keV : 71.0177 ( -71.4006 107.773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9705 for 55 degrees of freedom
# Null hypothesis probability = 5.367951e-01
Photon flux (15-150 keV) in 1 sec: 0.934209 ( 6.06579 -0.293378 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0059e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.3057 (-6.2619 8.75523)
R^2/D10^2 : 6.60059E-02 (-0.0653702 0.249461)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.90 using 59 PHA bins.
# Reduced chi-squared = 0.9982 for 57 degrees of freedom
# Null hypothesis probability = 4.789481e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.006e-09 2.629e-09
25- 50 1.798e-08 1.121e-08
50-150 3.865e-08 2.475e-08
15-150 6.063e-08 3.822e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 3.93897 (-1.19091 1.56746)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9531 for 57 degrees of freedom
# Null hypothesis probability = 5.760244e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.808e-09 6.180e-09
25- 50 1.887e-08 1.178e-08
50-150 4.138e-08 2.499e-08
15-150 7.006e-08 4.258e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.11781 (-2.85407 6.70345)
R1^2/D10^2 : 1.68062 (-1.62636 5.94639)
kT2 [keV] : 24.9679 (-21.2488 42.2874)
R2^2/D10^2 : 1.51653E-02 (-0.0146245 0.0442699)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.04 using 59 PHA bins.
# Reduced chi-squared = 0.9643 for 55 degrees of freedom
# Null hypothesis probability = 5.500587e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.023e-08 6.205e-09
25- 50 1.825e-08 9.270e-09
50-150 4.396e-08 2.744e-08
15-150 7.245e-08 3.882e-08
Plot creation:
Thu Sep 6 10:27:08 EDT 2018