batgrbproduct analysis for trigger=864595
batgrbproduct Analysis for Trigger=864595
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): Mon Oct 1 15:31:20 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger864595/GCN5_download_cron
======================================================================
Trigger: 00864595 Segment: 000
BAT Trigger Time: 560010672 [s; MET]
Trigger Stop: 560010760 [s; MET]
UTC: 2018-09-30T14:30:50.322400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.8588155211045 Dec: 21.9444079956025 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.48
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.48
Flight Position: [ source = BAT ]
RA: 83.8588155211045 Dec: 21.9444079956025 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.005754751068 Dec: 21.9356272272915 [deg; J2000]
{ 05h 36m 01.4s , +21d 56' 08.3" }
+/- 5.09872683950018 [arcmin] (estimated 90% radius based on SNR)
+/- 3.71884461807656 [arcmin] (formal 1-sigma fit error)
SNR: 2.96796478305228
Angular difference between Flight and Ground position is 8.194787 arcmin
Partial Coding Fraction: 0.2578125 [ including projection effects ]
Duration
T90: 18.0879999399185 +/- 722.85436989683
Measured from: 261.18800008297
to: 279.276000022888 [s; relative to TRIGTIME]
T50: 1037.33999991417 +/- 725.244524720213
Measured from: -209.239999890327
to: 828.100000023842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 437.72000002861
to: 438.72000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: -209.240000009537
to: 828.100000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 13.547172 14.193331 7.355895 1.767426
0.446224 0.460025 0.397534 0.347951 [error]
Peak 0.050931 0.041458 0.035691 0.005972
0.013485 0.014813 0.012278 0.010365 [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 5.61e-06 6.71e-06 5.79e-06 8.55e-06 2.11e-05 2.67e-05 erg/cm2
Error 3.89e-07 2.79e-07 4.03e-07 1.24e-06 9.25e-07 1.61e-06 erg/cm2
Peak flux Power-law 5.51e-01 3.72e-01 1.64e-01 1.00e-01 1.14e+00 1.19e+00 ph/cm2/s
Error 2.30e-01 1.25e-01 8.36e-02 1.07e-01 3.80e-01 3.97e-01 ph/cm2/s
Fluence Cutoff-PL 5.51e-06 6.78e-06 5.80e-06 7.10e-06 2.09e-05 2.52e-05 erg/cm2
Error 4.67e-07 3.34e-07 4.11e-07 -------- 1.08e-06 3.03e-06 erg/cm2
Peak flux Cutoff-PL 3.29e-01 5.41e-01 2.09e-01 9.81e-03 1.09e+00 1.09e+00 ph/cm2/s
Error 3.13e-01 1.75e-01 1.17e-01 2.66e-02 3.88e-01 3.89e-01 ph/cm2/s
Fluence Band 5.30e-06 6.99e-06 5.02e-06 2.30e-06 1.89e-05 1.97e-05 erg/cm2
Error -------- -------- -------- 2.45e-06 -------- -------- erg/cm2
Peak flux Band 1.68e-01 1.23e-01 4.51e-02 1.02e-02 3.43e-01 3.46e-01 ph/cm2/s
Error 3.58e-02 -------- -------- -------- -------- 4.77e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.211 0.086 - - 2.16e-03 1.07e-04 54.790 57
CPL 1.996 0.129 0.8 0.4 2.80e-03 0.00e+00 54.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.186 0.537 - - 6.92e-03 2.86e-03 52.170 57
CPL -1.387 4.203 43.9 12.7 5.73e-01 1.03e+02 46.130 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1037.340 -209.240 828.100
T90 18.088 261.188 279.276
T50 1037.340 -209.240 828.100
Peak 1.000 437.720 438.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.0058 +21.9356 0.0646 47.6 177.8 15.7131 3.0 TRIG_00864595
------------------------------------------
Foreground time interval of the image:
-209.240 465.300 (delta_t = 674.540 [sec])
466.000 828.100 (delta_t = 362.100 [sec])
Background time interval of the image:
-239.000 -209.240 (delta_t = 29.760 [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
Multiple GTIs in the spectrum
tstart tstop
-209.240000 465.300000
466.000000 828.100000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21077 ( -0.0855192 0.0874365 )
Norm@50keV : 2.16321E-03 ( -0.000107208 0.000106117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.79 using 59 PHA bins.
# Reduced chi-squared = 0.9613 for 57 degrees of freedom
# Null hypothesis probability = 5.583455e-01
Photon flux (15-150 keV) in 1037 sec: 0.360168 ( -0.0163525 0.0164318 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11238e-05 ( -9.2287e-07 9.27181e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-209.240000 465.300000
466.000000 828.100000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99623 ( -0.256032 0.00239744 )
Epeak [keV] : 0.828607 ( -0.251778 0.58956 )
Norm@50keV : 2.79658E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 56 degrees of freedom
# Null hypothesis probability = 5.251523e-01
Photon flux (15-150 keV) in 1037 sec: 0.357073 ( -0.018254 0.018197 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09201e-05 ( -1.09549e-06 1.06417e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-209.240000 465.300000
466.000000 828.100000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67489 ( 1.68622 1.68622 )
beta : -2.28003 ( 2.27934 0.13727 )
Epeak [keV] : 20.6642 ( -20.0295 10.275 )
Norm@50keV : 4.68514E-03 ( -0.00180005 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9790 for 55 degrees of freedom
# Null hypothesis probability = 5.188832e-01
Photon flux (15-150 keV) in 1037 sec: 0.343377 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88982e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0460 ( )
R^2/D10^2 : 0.147088 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 199.99 using 59 PHA bins.
# Reduced chi-squared = 3.5085 for 57 degrees of freedom
# Null hypothesis probability = 8.942870e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.140e-06 2.344e-07
25- 50 7.858e-06 3.453e-07
50-150 4.156e-06 4.957e-07
15-150 1.515e-05 7.000e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3442 (-6.59912 7.78052)
Norm : 1.85301 (-0.152424 0.148508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.760713e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.777e-06 3.282e-07
25- 50 7.128e-06 3.261e-07
50-150 7.688e-06 6.855e-07
15-150 1.959e-05 8.452e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.97922 (-0.715936 0.736203)
R1^2/D10^2 : 0.914394 (-0.327481 0.606925)
kT2 [keV] : 21.2001 (-3.14903 4.39551)
R2^2/D10^2 : 5.32969E-03 (-0.00278243 0.00504371)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.59 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.812106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.949e-06 6.492e-07
25- 50 6.852e-06 6.798e-07
50-150 8.502e-06 1.586e-06
15-150 2.030e-05 2.421e-06
Peak spectrum fit
Power-law model
Time interval is from 437.720 sec. to 438.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18560 ( -0.479816 0.594375 )
Norm@50keV : 6.91918E-03 ( -0.00288187 0.00282907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9152 for 57 degrees of freedom
# Null hypothesis probability = 6.565512e-01
Photon flux (15-150 keV) in 1 sec: 1.13651 ( -0.379761 0.380584 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50725e-08 ( -2.38598e-08 2.49018e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 437.720 sec. to 438.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38731 ( -5.72839 2.67726 )
Epeak [keV] : 43.8916 ( -13.7388 11.6729 )
Norm@50keV : 0.573288 ( -0.649097 206.088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.13 using 59 PHA bins.
# Reduced chi-squared = 0.8238 for 56 degrees of freedom
# Null hypothesis probability = 8.236799e-01
Photon flux (15-150 keV) in 1 sec: 1.08891 ( -0.393664 0.38234 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.48666e-08 ( -2.04668e-08 2.17768e-08 ) ergs/cm2
Band function
Time interval is from 437.720 sec. to 438.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.30853 ( -2.48031 -1.30865 )
beta : -9.37167 ( 8.84847 18.8464 )
Epeak [keV] : 43.8266 ( -12.0816 12.0018 )
Norm@50keV : 0.522481 ( -0.555563 25.2241 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8389 for 55 degrees of freedom
# Null hypothesis probability = 7.967992e-01
Photon flux (15-150 keV) in 1 sec: 0.343377 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82239e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4404 (-2.60255 2.94831)
R^2/D10^2 : 0.377568 (-0.230148 0.615207)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.96 using 59 PHA bins.
# Reduced chi-squared = 0.8063 for 57 degrees of freedom
# Null hypothesis probability = 8.522314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.039e-08 5.571e-09
25- 50 3.089e-08 1.802e-08
50-150 2.351e-08 1.634e-08
15-150 6.479e-08 3.899e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.0244 (-23.3849 57.4152)
Norm : 6.88045 (-2.7221 4.0954)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.24 using 59 PHA bins.
# Reduced chi-squared = 0.8638 for 57 degrees of freedom
# Null hypothesis probability = 7.579962e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.683e-08 8.673e-09
25- 50 2.417e-08 1.492e-08
50-150 2.348e-08 1.887e-08
15-150 6.447e-08 3.943e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.70247 (-3.70756 18.9202)
R1^2/D10^2 : 7.05081 (-6.98321 -6.98321)
kT2 [keV] : 12.0824 (-3.03655 -12.0875)
R2^2/D10^2 : 0.283832 (-0.282882 0.632916)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.56 using 59 PHA bins.
# Reduced chi-squared = 0.8284 for 55 degrees of freedom
# Null hypothesis probability = 8.140112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.312e-08 6.410e-09
25- 50 2.907e-08 1.793e-08
50-150 2.454e-08 1.671e-08
15-150 6.673e-08 3.996e-08
Plot creation:
Mon Oct 1 15:34:43 EDT 2018