batgrbproduct analysis for trigger=834937
batgrbproduct Analysis for Trigger=834937
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): Fri Jun 1 04:06:19 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger834937/GCN5_download_cron
======================================================================
Trigger: 00834937 Segment: 000
BAT Trigger Time: 549432152 [s; MET]
Trigger Stop: 549432216 [s; MET]
UTC: 2018-05-31T04:02:10.971200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 210.507655601767 Dec: 11.9852077526474 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.12
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.12
Flight Position: [ source = BAT ]
RA: 210.507655601767 Dec: 11.9852077526474 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 210.512766079688 Dec: 12.0022353277281 [deg; J2000]
{ 14h 02m 03.1s , +12d 00' 08.0" }
+/- 3.55103999538044 [arcmin] (estimated 90% radius based on SNR)
+/- 2.36253184648442 [arcmin] (formal 1-sigma fit error)
SNR: 4.97618074011102
Angular difference between Flight and Ground position is 1.064772 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 62.2079998254776 +/- 15.2713776725853
Measured from: 1.19200015068054
to: 63.3999999761581 [s; relative to TRIGTIME]
T50: 40.8319998979568 +/- 29.8092324290853
Measured from: 10.3440001010895
to: 51.1759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.0039999485016
to: 11.0039999485016 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.8400000333786
to: 67.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.242709 0.269334 -0.000719 0.056986
0.054525 0.053674 0.047108 0.041377 [error]
Peak 0.020707 0.016180 0.006759 0.011437
0.006771 0.006333 0.005535 0.004864 [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 6.69e-08 7.93e-08 6.79e-08 9.89e-08 2.49e-07 3.13e-07 erg/cm2
Error 2.18e-08 2.39e-08 3.64e-08 1.17e-07 8.81e-08 1.53e-07 erg/cm2
Peak flux Power-law 1.65e-01 1.22e-01 5.95e-02 4.14e-02 3.66e-01 3.87e-01 ph/cm2/s
Error 8.95e-02 4.96e-02 4.15e-02 6.53e-02 1.46e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 5.49e-08 1.15e-07 4.33e-08 1.21e-09 2.15e-07 2.14e-07 erg/cm2
Error 2.82e-08 3.65e-08 4.37e-08 1.45e-08 6.55e-08 6.60e-08 erg/cm2
Peak flux Cutoff-PL 1.66e-01 1.22e-01 5.81e-02 3.29e-02 3.65e-01 3.75e-01 ph/cm2/s
Error 8.97e-02 5.48e-02 1.64e-02 6.51e-02 1.21e-01 2.73e-01 ph/cm2/s
Fluence Band 5.45e-08 1.15e-07 4.31e-08 1.51e-09 2.15e-07 2.13e-07 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 2.223 0.521 - - 3.78e-04 1.53e-04 66.810 57
CPL -1.267 3.893 34.6 11.1 5.42e-02 2.25e+01 61.860 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.030 0.831 - - 2.40e-03 1.29e-03 55.980 57
CPL -9.941 0.000 25.2 0.0 2.55e+06 0.00e+00 53.040 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 69.888 -2.840 67.048
T90 62.208 1.192 63.400
T50 40.832 10.344 51.176
Peak 1.000 10.004 11.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
210.5128 +12.0022 0.0386 12.7 -85.6 0.5309 5.0 TRIG_00834937
------------------------------------------
Foreground time interval of the image:
-2.840 67.048 (delta_t = 69.888 [sec])
Background time interval of the image:
-239.000 -2.840 (delta_t = 236.160 [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 -2.840 sec. to 67.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22265 ( -0.471745 0.56941 )
Norm@50keV : 3.78246E-04 ( -0.000152931 0.000152707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.81 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.754954e-01
Photon flux (15-150 keV) in 69.89 sec: 6.33687E-02 ( -0.0175126 0.0175587 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49197e-07 ( -8.41196e-08 9.20556e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.840 sec. to 67.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26678 ( -5.04602 2.73941 )
Epeak [keV] : 34.5969 ( -12.8271 9.34776 )
Norm@50keV : 5.42444E-02 ( -0.062222 45.0268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.86 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.748513e-01
Photon flux (15-150 keV) in 69.89 sec: 6.08130E-02 ( -0.0168915 0.0169454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14635e-07 ( -6.09979e-08 6.99557e-08 ) ergs/cm2
Band function
Time interval is from -2.840 sec. to 67.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.22915 ( -2.70656 -1.27016 )
beta : -9.37167 ( 9.37167 19.3678 )
Epeak [keV] : 34.6171 ( -7.67094 9.32644 )
Norm@50keV : 5.13016E-02 ( -0.0619146 8.07792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.443298e-01
Photon flux (15-150 keV) in 69.89 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15079e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.98855 (-1.88047 2.23872)
R^2/D10^2 : 4.96204E-02 (-0.0293161 0.0730157)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.71 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.115139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.452e-08 3.137e-08
25- 50 1.156e-07 6.145e-08
50-150 4.394e-08 3.232e-08
15-150 2.141e-07 9.870e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.8655 (-18.0434 45.1335)
Norm : 0.418765 (-0.154631 0.252744)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.35 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.348058e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.769e-08 3.052e-08
25- 50 8.987e-08 5.103e-08
50-150 7.116e-08 5.444e-08
15-150 2.287e-07 1.251e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.60830 (-2.58918 -2.58918)
R1^2/D10^2 : 2.07578 (-2.25718 -2.25718)
kT2 [keV] : 9.45458 (-2.18929 -9.42258)
R2^2/D10^2 : 3.85476E-02 (-0.0390511 0.0757124)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.35 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 55 degrees of freedom
# Null hypothesis probability = 2.589007e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.877e-08 3.064e-08
25- 50 1.109e-07 6.559e-08
50-150 4.869e-08 3.320e-08
15-150 2.184e-07 1.321e-07
Peak spectrum fit
Power-law model
Time interval is from 10.004 sec. to 11.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03035 ( -0.776503 0.885191 )
Norm@50keV : 2.40256E-03 ( -0.00130933 0.00126861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.98 using 59 PHA bins.
# Reduced chi-squared = 0.9821 for 57 degrees of freedom
# Null hypothesis probability = 5.132982e-01
Photon flux (15-150 keV) in 1 sec: 0.365507 ( -0.146215 0.146228 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21959e-08 ( -1.05209e-08 1.19581e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.004 sec. to 11.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.94113 ( )
Epeak [keV] : 25.1741 ( )
Norm@50keV : 2.55067E+06 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.04 using 59 PHA bins.
# Reduced chi-squared = 0.9472 for 56 degrees of freedom
# Null hypothesis probability = 5.875022e-01
Photon flux (15-150 keV) in 1 sec: 0.365086 0.325197 0.324493 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72851e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 10.004 sec. to 11.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -7.42012 -5 )
beta : -3.30561 ( 3.31199 1.58564 )
Epeak [keV] : 25.3811 ( -10.0969 7.00569 )
Norm@50keV : 475.734 ( -176.318 9977.44 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 55 degrees of freedom
# Null hypothesis probability = 5.439509e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21665e-09 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.65464 (-1.92284 3.33503)
R^2/D10^2 : 0.878133 (-0.878125 2.81834)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.13 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 57 degrees of freedom
# Null hypothesis probability = 5.454351e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.909e-09 3.913e-09
25- 50 7.322e-09 4.735e-09
50-150 1.007e-09 9.750e-10
15-150 1.424e-08 9.320e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.1566 (-44.1788 -44.1788)
Norm : 2.21435 (-1.22639 3.40771)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 57 degrees of freedom
# Null hypothesis probability = 5.115823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.244e-09 3.461e-09
25- 50 7.187e-09 4.956e-09
50-150 6.175e-09 5.170e-09
15-150 1.861e-08 1.351e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13322 (-1.69885 2.24723)
R1^2/D10^2 : 1.16155 (-0.798009 3.32597)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 5.20905E-05 (-4.9072e-05 0.000419021)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.09 using 59 PHA bins.
# Reduced chi-squared = 0.9474 for 55 degrees of freedom
# Reduced chi-squared = 0.9470 for 55 degrees of freedom
# Null hypothesis probability = 5.858955e-01
# Null hypothesis probability = 5.866729e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.887e-09 3.692e-09
25- 50 7.067e-09 4.598e-09
50-150 1.378e-08 1.109e-09
15-150 2.673e-08 9.405e-09
Plot creation:
Fri Jun 1 04:09:52 EDT 2018