batgrbproduct analysis for trigger=797441
batgrbproduct Analysis for Trigger=797441
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): Sun Dec 17 06:16:12 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger797441/GCN5_download_cron
======================================================================
Trigger: 00797441 Segment: 000
BAT Trigger Time: 535086439.616 [s; MET]
Trigger Stop: 535086442.688 [s; MET]
UTC: 2017-12-16T03:06:59.453420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.077708008229 Dec: -50.4731225924403 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.36
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 7.36
Flight Position: [ source = BAT ]
RA: 212.077708008229 Dec: -50.4731225924403 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.012613922809 Dec: -50.5003280960833 [deg; J2000]
{ 14h 08m 03.0s , -50d 30' 01.2" }
+/- 2.05026080142326 [arcmin] (estimated 90% radius based on SNR)
+/- 0.955598766923174 [arcmin] (formal 1-sigma fit error)
SNR: 10.9062838434715
Angular difference between Flight and Ground position is 2.973163 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 29.9519999623299 +/- 7.45977581687936
Measured from: 0.512000143527985
to: 30.4640001058578 [s; relative to TRIGTIME]
T50: 13.5040000081062 +/- 8.59818027952436
Measured from: 3.13600009679794
to: 16.6400001049042 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.05199998617172
to: 4.05199998617172 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.448000013828278
to: 33.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.217937 0.360835 0.194082 0.000115
0.047832 0.049653 0.043312 0.038181 [error]
Peak 0.019944 0.041995 0.026754 0.009019
0.008525 0.008997 0.007740 0.006629 [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 7.49e-08 1.27e-07 1.64e-07 4.27e-07 4.83e-07 7.93e-07 erg/cm2
Error 2.01e-08 2.28e-08 4.15e-08 2.20e-07 1.00e-07 2.60e-07 erg/cm2
Peak flux Power-law 2.41e-01 2.69e-01 2.14e-01 2.82e-01 8.29e-01 1.01e+00 ph/cm2/s
Error 1.10e-01 7.63e-02 6.25e-02 1.75e-01 2.12e-01 2.56e-01 ph/cm2/s
Fluence Cutoff-PL 6.71e-08 1.47e-07 1.61e-07 8.15e-08 4.31e-07 4.56e-07 erg/cm2
Error 2.23e-08 3.31e-08 4.95e-08 2.44e-07 1.12e-07 2.81e-07 erg/cm2
Peak flux Cutoff-PL 2.39e-01 2.70e-01 2.15e-01 2.64e-01 8.27e-01 9.89e-01 ph/cm2/s
Error 1.15e-01 8.54e-02 6.93e-02 2.52e-01 1.61e-01 3.06e-01 ph/cm2/s
Fluence Band 6.52e-08 1.53e-07 1.50e-07 2.61e-07 4.55e-07 6.30e-07 erg/cm2
Error 2.52e-08 -------- -------- -------- 1.30e-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 1.631 0.298 - - 1.53e-03 2.96e-04 72.030 57
CPL 0.467 1.608 57.2 -20.4 6.91e-03 4.85e-02 69.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.329 0.437 - - 6.91e-03 1.71e-03 44.980 57
CPL 1.276 3.288 704.3 0.0 7.34e-03 3.57e-02 44.980 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: 6.528000 sec.
T50 in the 50-300 keV band: 3.136000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.920 -0.448 33.472
T90 29.952 0.512 30.464
T50 13.504 3.136 16.640
Peak 1.000 3.052 4.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.0126 -50.5003 0.0176 29.4 -43.3 1.0238 10.9 TRIG_00797441
------------------------------------------
Foreground time interval of the image:
-0.448 33.472 (delta_t = 33.920 [sec])
Background time interval of the image:
-239.616 -0.448 (delta_t = 239.168 [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 -0.448 sec. to 33.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63103 ( -0.293453 0.302658 )
Norm@50keV : 1.52856E-03 ( -0.000298575 0.000293379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.03 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.670600e-02
Photon flux (15-150 keV) in 33.92 sec: 0.198362 ( -0.0355573 0.0355842 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83173e-07 ( -9.8869e-08 1.01496e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 33.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.466796 ( -1.95219 1.26294 )
Epeak [keV] : 57.2041 ( -16.3727 -57.2013 )
Norm@50keV : 6.91386E-03 ( -0.00691506 0.0900377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.68 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 56 degrees of freedom
# Null hypothesis probability = 1.034287e-01
Photon flux (15-150 keV) in 33.92 sec: 0.191044 ( -0.036339 0.036477 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30842e-07 ( -1.07309e-07 1.16525e-07 ) ergs/cm2
Band function
Time interval is from -0.448 sec. to 33.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.496423 ( -0.856387 1.20403 )
beta : -10.00000 ( 10 1.12549e-08 )
Epeak [keV] : 57.6267 ( -16.3174 -57.6267 )
Norm@50keV : 6.65151E-03 ( -0.00116955 0.0906029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.68 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 55 degrees of freedom
# Null hypothesis probability = 8.785098e-02
Photon flux (15-150 keV) in 33.92 sec: 0.191786 ( 6.80821 -0.035413 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55261e-07 ( -4.55023e-07 -1.56863e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7315 (-2.1738 2.8707)
R^2/D10^2 : 5.48012E-02 (-0.0304179 0.061681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.76 using 59 PHA bins.
# Reduced chi-squared = 1.276 for 57 degrees of freedom
# Null hypothesis probability = 7.789448e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.399e-08 1.889e-08
25- 50 1.654e-07 4.874e-08
50-150 1.348e-07 5.778e-08
15-150 3.542e-07 9.964e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.530 (-67.6443 -135.083)
Norm : 0.838217 (-0.163131 0.220683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.62 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.060277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.355e-08 4.159e-08
25- 50 1.344e-07 7.464e-08
50-150 2.548e-07 1.602e-07
15-150 4.627e-07 2.712e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17848 (-3.28418 3.53486)
R1^2/D10^2 : 0.144693 (-0.0884356 0.398947)
kT2 [keV] : 25.4104 (-22.4331 -27.5491)
R2^2/D10^2 : 1.84865E-03 (-0.0014263 0.010183)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.14 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.097976e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.729e-08 4.087e-08
25- 50 1.495e-07 9.018e-08
50-150 2.214e-07 1.322e-07
15-150 4.382e-07 2.259e-07
Peak spectrum fit
Power-law model
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32887 ( -0.44247 0.430821 )
Norm@50keV : 6.90797E-03 ( -0.00171051 0.00170869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.755180e-01
Photon flux (15-150 keV) in 1 sec: 0.828678 ( -0.211887 0.213049 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77937e-08 ( -1.82482e-08 1.85064e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27551 ( -2.05621 4.51929 )
Epeak [keV] : 704.287 ( -714.492 -714.492 )
Norm@50keV : 7.34441E-03 ( -0.00209978 0.0692757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8031 for 56 degrees of freedom
# Null hypothesis probability = 8.543095e-01
Photon flux (15-150 keV) in 1 sec: 0.827237 ( -0.108561 0.213553 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.76139e-08 ( -2.00098e-08 9.4588e-09 ) ergs/cm2
Band function
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.164738 ( 0.696579 0.696579 )
beta : -1.48729 ( 1.45421 0.552037 )
Epeak [keV] : 57.8858 ( -57.5263 142.566 )
Norm@50keV : 3.48558E-02 ( -0.0357762 241.55 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.76 using 59 PHA bins.
# Reduced chi-squared = 0.8139 for 55 degrees of freedom
# Null hypothesis probability = 8.362856e-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] : 16.0556 (-4.67155 7.95691)
R^2/D10^2 : 7.66314E-02 (-0.0568937 0.176089)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.14 using 59 PHA bins.
# Reduced chi-squared = 0.8621 for 57 degrees of freedom
# Null hypothesis probability = 7.610583e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.081e-09 2.568e-09
25- 50 1.723e-08 9.621e-09
50-150 3.108e-08 1.889e-08
15-150 5.238e-08 2.764e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-103.422 -199.363)
Norm : 3.45168 (-0.860507 0.860506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.78 using 59 PHA bins.
# Reduced chi-squared = 0.8032 for 57 degrees of freedom
# Null hypothesis probability = 8.565536e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.595e-09 5.215e-09
25- 50 1.653e-08 9.955e-09
50-150 3.626e-08 2.143e-08
15-150 6.139e-08 3.648e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.93987 (-5.65837 5.928)
R1^2/D10^2 : 0.305640 (-0.241243 0.427473)
kT2 [keV] : 58.3870 (-58.3869 -58.387)
R2^2/D10^2 : 1.05670E-03 (-0.000925971 0.00796158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.36 using 59 PHA bins.
# Reduced chi-squared = 0.8066 for 55 degrees of freedom
# Null hypothesis probability = 8.469163e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.485e-09 4.174e-09
25- 50 1.772e-08 1.083e-08
50-150 4.422e-08 2.315e-08
15-150 6.843e-08 3.404e-08
Plot creation:
Sun Dec 17 06:20:45 EST 2017