batgrbproduct analysis for trigger=775946
batgrbproduct Analysis for Trigger=775946
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 Oct 4 01:01:52 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger775946/GCN5_download_cron
======================================================================
Trigger: 00775946 Segment: 000
BAT Trigger Time: 528691040 [s; MET]
Trigger Stop: 528691368 [s; MET]
UTC: 2017-10-03T02:37:00.219740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 40.9097919316132 Dec: 61.4078722437967 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.67
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.67
Flight Position: [ source = BAT ]
RA: 40.9097919316132 Dec: 61.4078722437967 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.7875173351195 Dec: 61.3659071920218 [deg; J2000]
{ 02h 43m 09.0s , +61d 21' 57.3" }
+/- 3.72007003749071 [arcmin] (estimated 90% radius based on SNR)
+/- 2.98767780979318 [arcmin] (formal 1-sigma fit error)
SNR: 4.6563472064837
Angular difference between Flight and Ground position is 4.322465 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 328 +/-
Measured from: 0
to: 328 [s; relative to TRIGTIME]
T50: 328 +/-
Measured from: 0
to: 328 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 328 second)
Measured from: 0
to: 328 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 328 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.902941 0.712252 -0.084787 -0.271142
0.105292 0.111320 0.103097 0.105537 [error]
Peak 0.902941 0.712252 -0.084787 -0.271142
0.105292 0.111320 0.103097 0.105537 [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 2.65e-07 2.24e-07 1.29e-07 1.10e-07 6.66e-07 7.28e-07 erg/cm2
Error 4.85e-08 5.35e-08 6.22e-08 9.65e-08 1.57e-07 2.11e-07 erg/cm2
Peak flux Power-law 2.69e-02 1.27e-02 3.65e-03 1.32e-03 4.40e-02 4.45e-02 ph/cm2/s
Error 5.02e-03 2.90e-03 1.71e-03 1.08e-03 7.63e-03 7.86e-03 ph/cm2/s
Fluence Cutoff-PL 2.54e-07 2.80e-07 7.74e-08 3.16e-09 6.14e-07 6.17e-07 erg/cm2
Error 5.37e-08 7.41e-08 7.71e-08 2.36e-08 1.29e-07 1.30e-07 erg/cm2
Peak flux Cutoff-PL 2.52e-02 1.60e-02 2.39e-03 5.19e-05 4.36e-02 4.36e-02 ph/cm2/s
Error 5.63e-03 4.07e-03 1.44e-03 3.38e-04 7.31e-03 7.31e-03 ph/cm2/s
Fluence Band 2.54e-07 2.74e-07 8.50e-08 4.53e-09 6.19e-07 6.18e-07 erg/cm2
Error 5.37e-08 5.75e-08 5.98e-08 -------- -------- -------- erg/cm2
Peak flux Band 2.52e-02 1.60e-02 2.38e-03 5.21e-05 4.36e-02 4.36e-02 ph/cm2/s
Error 5.61e-03 4.04e-03 1.71e-03 -------- 7.24e-03 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.799 0.422 - - 1.84e-04 6.71e-05 81.910 57
CPL 0.653 2.120 20.9 0.0 4.84e-03 0.00e+00 77.080 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.799 0.422 - - 1.84e-04 6.71e-05 81.910 57
CPL 0.653 2.120 20.9 0.0 4.84e-03 0.00e+00 77.080 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 328.000 0.000 328.000
T90 328.000 0.000 328.000
T50 328.000 0.000 328.000
Peak 328.000 0.000 328.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.7875 +61.3659 0.0411 10.4 -93.5 1.5182 4.7 TRIG_00775946
------------------------------------------
Foreground time interval of the image:
0.000 140.220 (delta_t = 140.220 [sec])
141.000 328.000 (delta_t = 187.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 140.220000
141.000000 328.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79867 ( -0.381052 0.463507 )
Norm@50keV : 1.84397E-04 ( -6.51157e-05 6.91404e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.91 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 57 degrees of freedom
# Null hypothesis probability = 1.698526e-02
Photon flux (15-150 keV) in 327.2 sec: 4.39833E-02 ( -0.0076059 0.00764721 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65567e-07 ( -1.50187e-07 1.6443e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 140.220000
141.000000 328.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.653413 ( -2.82026 1.41921 )
Epeak [keV] : 20.9046 ( )
Norm@50keV : 4.84229E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.08 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 56 degrees of freedom
# Null hypothesis probability = 3.238037e-02
Photon flux (15-150 keV) in 327.2 sec: 4.36282E-02 ( -0.0073032 0.007318 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14442e-07 ( -1.20943e-07 1.37211e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 140.220000
141.000000 328.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.473310 ( -1.57431 2.76905 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 21.7618 ( -13.0922 8.12279 )
Norm@50keV : 6.40120E-03 ( -0.00639602 0.383897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.05 using 59 PHA bins.
# Reduced chi-squared = 1.401 for 55 degrees of freedom
# Null hypothesis probability = 2.649411e-02
Photon flux (15-150 keV) in 327.2 sec: 4.36025E-02 ( 6.9564 -0.0071526 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18676e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.83710 (-1.14436 1.24385)
R^2/D10^2 : 9.74866E-02 (-0.0485948 0.110388)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.82 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.941430e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.336e-07 7.174e-08
25- 50 3.055e-07 1.011e-07
50-150 4.646e-08 2.634e-08
15-150 5.856e-07 1.644e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7449 (-7.12756 10.6979)
Norm : 0.453155 (-0.137808 0.226049)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.67 using 59 PHA bins.
# Reduced chi-squared = 1.363 for 57 degrees of freedom
# Null hypothesis probability = 3.573496e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.623e-07 6.078e-08
25- 50 2.600e-07 8.224e-08
50-150 1.024e-07 7.087e-08
15-150 6.247e-07 1.847e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.07207 (-1.8638 2.34888)
R1^2/D10^2 : 17.1877 (-46.6891 -46.9968)
kT2 [keV] : 7.96506 (-1.53157 2.14446)
R2^2/D10^2 : 4.51956E-02 (-0.0342448 0.0568073)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.40 using 59 PHA bins.
# Reduced chi-squared = 1.353 for 55 degrees of freedom
# Null hypothesis probability = 4.181882e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.393e-07 1.198e-07
25- 50 2.960e-07 1.698e-07
50-150 7.602e-08 5.476e-08
15-150 6.113e-07 3.205e-07
Peak spectrum fit
Power-law model
Time interval is from 141.000 sec. to 328.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79867 ( -0.381052 0.463507 )
Norm@50keV : 1.84397E-04 ( -6.51157e-05 6.91404e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.91 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 57 degrees of freedom
# Null hypothesis probability = 1.698526e-02
Photon flux (15-150 keV) in 327.2 sec: 4.39833E-02 ( -0.0076059 0.00764721 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65567e-07 ( -1.50187e-07 1.6443e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 141.000 sec. to 328.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.653413 ( -2.82026 1.41921 )
Epeak [keV] : 20.9046 ( )
Norm@50keV : 4.84229E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.08 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 56 degrees of freedom
# Null hypothesis probability = 3.238037e-02
Photon flux (15-150 keV) in 327.2 sec: 4.36282E-02 ( -0.0073032 0.007318 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14442e-07 ( -1.20943e-07 1.37211e-07 ) ergs/cm2
Band function
Time interval is from 141.000 sec. to 328.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.473310 ( -1.57431 2.76905 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 21.7618 ( -12.98 8.12284 )
Norm@50keV : 6.40120E-03 ( -0.00639602 0.383897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.05 using 59 PHA bins.
# Reduced chi-squared = 1.401 for 55 degrees of freedom
# Null hypothesis probability = 2.649411e-02
Photon flux (15-150 keV) in 327.2 sec: 4.36025E-02 ( 6.9564 -0.0071526 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18676e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.83710 (-1.14436 1.24385)
R^2/D10^2 : 9.74866E-02 (-0.0485948 0.110388)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.82 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.941430e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.336e-07 6.222e-08
25- 50 3.055e-07 9.914e-08
50-150 4.646e-08 2.793e-08
15-150 5.856e-07 1.590e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7449 (-7.12756 10.6979)
Norm : 0.453155 (-0.137808 0.226049)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.67 using 59 PHA bins.
# Reduced chi-squared = 1.363 for 57 degrees of freedom
# Null hypothesis probability = 3.573496e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.623e-07 5.955e-08
25- 50 2.600e-07 8.223e-08
50-150 1.024e-07 6.846e-08
15-150 6.247e-07 1.868e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.07207 (-1.80686 2.43248)
R1^2/D10^2 : 17.1877 (-46.6891 -46.9968)
kT2 [keV] : 7.96506 (-1.53157 2.14446)
R2^2/D10^2 : 4.51956E-02 (-0.0342448 0.0568053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.40 using 59 PHA bins.
# Reduced chi-squared = 1.353 for 55 degrees of freedom
# Null hypothesis probability = 4.181882e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.393e-07 1.180e-07
25- 50 2.960e-07 1.706e-07
50-150 7.602e-08 5.232e-08
15-150 6.113e-07 3.292e-07
Plot creation:
Wed Oct 4 01:29:44 EDT 2017