batgrbproduct analysis for trigger=829046
batgrbproduct Analysis for Trigger=829046
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 Apr 27 15:43:29 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger829046/GCN5_download_cron
======================================================================
Trigger: 00829046 Segment: 000
BAT Trigger Time: 546441536 [s; MET]
Trigger Stop: 546441600 [s; MET]
UTC: 2018-04-26T13:18:35.152640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 57.4586368896646 Dec: -48.7816496589733 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.86
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.86
Flight Position: [ source = BAT ]
RA: 57.4586368896646 Dec: -48.7816496589733 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 57.483859899816 Dec: -48.7100599455883 [deg; J2000]
{ 03h 49m 56.1s , -48d 42' 36.2" }
+/- 3.30872433692803 [arcmin] (estimated 90% radius based on SNR)
+/- 2.32657402285944 [arcmin] (formal 1-sigma fit error)
SNR: 5.5048579217438
Angular difference between Flight and Ground position is 4.409781 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.201378 0.165574 0.040286 0.040230
0.046389 0.048900 0.044882 0.045758 [error]
Peak 0.201378 0.165574 0.040286 0.040230
0.046389 0.048900 0.044882 0.045758 [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 4.43e-08 6.09e-08 6.17e-08 1.14e-07 2.03e-07 2.80e-07 erg/cm2
Error 1.80e-08 2.13e-08 3.66e-08 1.51e-07 8.79e-08 1.83e-07 erg/cm2
Peak flux Power-law 2.31e-02 1.75e-02 8.89e-03 6.47e-03 5.26e-02 5.60e-02 ph/cm2/s
Error 9.56e-03 6.02e-03 5.11e-03 8.02e-03 1.76e-02 1.96e-02 ph/cm2/s
Fluence Cutoff-PL 5.75e-08 6.25e-08 5.17e-10 9.48e-17 1.21e-07 1.21e-07 erg/cm2
Error 2.14e-08 2.96e-08 6.61e-09 2.26e-11 3.71e-08 3.71e-08 erg/cm2
Peak flux Cutoff-PL 2.84e-02 2.03e-02 9.55e-05 8.98e-12 4.88e-02 4.88e-02 ph/cm2/s
Error 1.09e-02 8.72e-03 1.13e-03 2.11e-06 1.44e-02 1.44e-02 ph/cm2/s
Fluence Band 5.23e-08 7.45e-08 3.33e-08 2.00e-08 1.71e-07 1.81e-07 erg/cm2
Error 2.01e-08 2.83e-08 -------- -------- -------- -------- 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 1.979 0.603 - - 3.54e-04 1.58e-04 60.640 57
CPL -10.000 0.000 25.6 0.0 3.51e+05 0.00e+00 53.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.979 0.603 - - 3.54e-04 1.58e-04 60.640 57
CPL -10.000 0.000 25.6 0.0 3.51e+05 0.00e+00 53.850 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
57.4839 -48.7101 0.0349 16.6 149.1 0.5228 5.5 TRIG_00829046
------------------------------------------
Foreground time interval of the image:
0.000 45.474 (delta_t = 45.474 [sec])
47.000 64.000 (delta_t = 17.000 [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 45.474400
47.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97924 ( -0.560516 0.645733 )
Norm@50keV : 3.53736E-04 ( -0.000158349 0.000158154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.459926e-01
Photon flux (15-150 keV) in 62.47 sec: 5.25559E-02 ( -0.0175386 0.0176235 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0348e-07 ( -8.25753e-08 9.33196e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 45.474400
47.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99970 ( )
Epeak [keV] : 25.5630 ( )
Norm@50keV : 3.50505E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.85 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 56 degrees of freedom
# Null hypothesis probability = 5.568746e-01
Photon flux (15-150 keV) in 62.47 sec: 4.87845E-02 4.86920E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71062e-18 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 45.474400
47.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.28417 -5 )
beta : -3.25160 ( 3.26485 1.20608 )
Epeak [keV] : 26.2084 ( -4.45336 5.47236 )
Norm@50keV : 57.1069 ( -16.8222 133.637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9862 for 55 degrees of freedom
# Null hypothesis probability = 5.035394e-01
Photon flux (15-150 keV) in 62.47 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70694e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.51317 (-1.88057 2.83185)
R^2/D10^2 : 8.07495E-02 (-0.0807496 0.171681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.646241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.894e-08 3.014e-08
25- 50 7.659e-08 4.698e-08
50-150 1.628e-08 1.414e-08
15-150 1.418e-07 8.958e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.9779 (-27.1552 -48.9781)
Norm : 0.306286 (-0.131255 0.247211)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.858741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.656e-08 2.908e-08
25- 50 6.637e-08 4.057e-08
50-150 6.319e-08 5.007e-08
15-150 1.761e-07 1.139e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12364 (-7.121 2.83823)
R1^2/D10^2 : 9.52965E-02 (-0.0954045 0.282114)
kT2 [keV] : 74.3618 (-74.1908 -74.1908)
R2^2/D10^2 : 1.63903E-05 (-1.65231e-05 -1.65231e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.69 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.117859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.985e-08 3.054e-08
25- 50 7.345e-08 4.845e-08
50-150 7.045e-08 2.586e-08
15-150 1.938e-07 9.855e-08
Peak spectrum fit
Power-law model
Time interval is from 47.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97924 ( -0.560516 0.645733 )
Norm@50keV : 3.53736E-04 ( -0.000158349 0.000158154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.459926e-01
Photon flux (15-150 keV) in 62.47 sec: 5.25559E-02 ( -0.0175386 0.0176235 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0348e-07 ( -8.25753e-08 9.33196e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99970 ( )
Epeak [keV] : 25.5630 ( )
Norm@50keV : 3.50505E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.85 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 56 degrees of freedom
# Null hypothesis probability = 5.568746e-01
Photon flux (15-150 keV) in 62.47 sec: 4.87845E-02 4.86920E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71062e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 47.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.28313 -5 )
beta : -3.25160 ( 3.26485 1.20608 )
Epeak [keV] : 26.2084 ( -4.45336 5.47236 )
Norm@50keV : 57.1069 ( -16.8222 133.637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9862 for 55 degrees of freedom
# Null hypothesis probability = 5.035394e-01
Photon flux (15-150 keV) in 62.47 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70694e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.51317 (-1.88057 2.83185)
R^2/D10^2 : 8.07495E-02 (-0.0807496 0.171681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.646241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.894e-08 2.974e-08
25- 50 7.659e-08 4.757e-08
50-150 1.628e-08 1.460e-08
15-150 1.418e-07 8.711e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.9779 (-27.1552 -48.9781)
Norm : 0.306286 (-0.131255 0.247211)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.858741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.656e-08 2.844e-08
25- 50 6.637e-08 4.001e-08
50-150 6.319e-08 4.985e-08
15-150 1.761e-07 1.185e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12364 (-7.121 2.83823)
R1^2/D10^2 : 9.52965E-02 (-0.0954045 0.281108)
kT2 [keV] : 74.3618 (-74.1908 -74.1908)
R2^2/D10^2 : 1.63903E-05 (-1.65231e-05 -1.65231e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.69 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.117859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.985e-08 3.083e-08
25- 50 7.345e-08 4.891e-08
50-150 7.045e-08 3.198e-08
15-150 1.938e-07 9.339e-08
Plot creation:
Fri Apr 27 15:54:28 EDT 2018