Analysis for Ground-detected GRB: Trigger=765422
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This is a special analysis for ground-detected GRB. The event data duration is likely to be shorter than the burst duration. In such cases, the burst durations are found using the quad-rate data, and spectral analyses are only available for event data range.
- 3) Some mask-weighted light curve plots might be missing because the time range is not completely covered by the event data range.
==========================================================================
BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Mon Jul 31 15:45:20 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00765422 Segment: 000
BAT Trigger Time: 523143144.0
UTC: 2017-07-30T21:32:04.549 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 274.34646 Dec: -16.71671 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 274.320259074 Dec: -16.6999992126 [deg; J2000]
{ 18h 17m 16.9s , -16d -41' -60.0" }
+/- 2.10480839637 [arcmin] (estimated 90% radius based on SNR)
SNR: 10.5061345475
Angular difference between the GCN position (ra=274.34646, dec=-16.71671 deg) and this refined position is 1.809 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 25.6000000238419 +/- 1.6
Measured from: 0
to: 25.6 [s; relative to TRIGTIME]
T50: 12.8000000715256 +/- 1.6
Measured from: 6.4
to: 19.2 [s; relative to TRIGTIME]
=== 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 7.66e-08 2.82e-08 5.95e-09 1.50e-09 1.12e-07 1.13e-07 erg/cm2
Error 1.17e-08 9.16e-09 4.38e-09 2.05e-09 1.93e-08 1.99e-08 erg/cm2
Peak flux Power-law 4.82e-01 9.39e-02 8.96e-03 9.32e-04 5.86e-01 5.86e-01 ph/cm2/s
Error 1.22e-01 6.03e-02 1.49e-02 3.40e-03 1.54e-01 1.54e-01 ph/cm2/s
Fluence Cutoff-PL -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Cutoff-PL 4.74e-01 8.40e-02 7.59e-03 8.89e-04 5.67e-01 5.67e-01 ph/cm2/s
Error 1.25e-01 6.45e-02 1.50e-02 4.06e-03 1.69e-01 -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 4.243 0.601 - - 5.25e-04 2.99e-04 58.020 57
CPL 1.857 0.000 1.3 0.0 4.30e-02 0.00e+00 58.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.389 1.290 - - 6.71e-04 8.76e-04 58.400 57
CPL 1.862 0.000 1.2 0.0 7.28e-02 0.00e+00 59.270 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
=== Table of the duration information ==
Value tstart tstop
T100 25.600 0.000 25.600
T90 25.600 0.000 25.600
T50 12.800 6.400 19.200
Peak 1.000 5.100 6.100
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
274.320 -16.700 0.018 14.307 49.819 0.371 10.506 TRIG_00765422
Image time interval: 0.000 to 8.041 [sec]
Lightcurves
Notes:
- 1) The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
- 2) 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 (for the best duration plot, slew times are marked by green arrows).
- 3) For lightcurves in unit of count rate, time of each bin is in the middle of the bin.
Best duration plot
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)
Spectral Evolution
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 0.000 sec. to 8.041 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.24313 ( -0.55789 0.644917 )
Norm@50keV : 5.25463E-04 ( -0.000250433 0.000347963 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.373528e-01
Photon flux (15-150 keV) in 8.041 sec: 0.402060 ( -0.059132 0.05917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11753e-07 ( -1.88307e-08 1.98331e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.041 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85674 ( )
Epeak [keV] : 1.33230 ( )
Norm@50keV : 4.30265E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 56 degrees of freedom
# Null hypothesis probability = 3.980690e-01
Photon flux (15-150 keV) in 8.041 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.041 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 3.41277 (-0.509737 0.614285)
R^2/D10^2 : 25.0204 (-15.3925 43.0093)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.654080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.024e-08 3.375e-08
25- 50 1.796e-08 8.236e-09
50-150 7.710e-11 7.184e-11
15-150 9.829e-08 3.605e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.79894 (-1.8588 2.67426)
Norm : 23.9728 (-11.7755 26.5859)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.284070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.882e-08 2.458e-08
25- 50 2.350e-08 1.055e-08
50-150 7.608e-10 6.567e-10
15-150 1.031e-07 3.499e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.79161 (-1.99136 1.03708)
R1^2/D10^2 : 69.0295 (-72.5023 -72.5023)
kT2 [keV] : 6.98394 (-6.7718 -6.7718)
R2^2/D10^2 : 0.218033 (-0.276682 2.30162)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.72 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.748659e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.912e-08 4.181e-08
25- 50 2.605e-08 1.356e-08
50-150 3.077e-09 2.355e-09
15-150 1.082e-07 5.311e-08
Peak spectrum fit
Power-law model
Time interval is from 5.100 sec. to 6.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.38898 ( -1.04265 1.53759 )
Norm@50keV : 6.71012E-04 ( -0.000671089 0.00108075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.236658e-01
Photon flux (15-150 keV) in 1 sec: 0.585780 ( -0.153508 0.153659 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98976e-08 ( -6.29255e-09 7.16877e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.100 sec. to 6.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86176 ( )
Epeak [keV] : 1.19898 ( )
Norm@50keV : 7.28378E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.571463e-01
Photon flux (15-150 keV) in 1 sec: 0.566644 ( -0.169786 0.167479 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 5.100 sec. to 6.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 3.21417 (-0.90854 1.19186)
R^2/D10^2 : 51.7553 (-51.792 407.076)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.494898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.466e-08 8.395e-09
25- 50 2.702e-09 1.651e-09
50-150 7.473e-12 7.985e-12
15-150 1.737e-08 9.855e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.25233 (-3.07395 6.02581)
Norm : 41.8875 (-41.7478 192.092)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.45 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.863092e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.444e-08 8.320e-09
25- 50 3.812e-09 2.476e-09
50-150 9.603e-11 1.029e-10
15-150 1.835e-08 1.087e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.99 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.73 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.316994e-01
# Null hypothesis probability = 3.727568e-01
# Null hypothesis probability = 3.737270e-01
# Null hypothesis probability = 3.748145e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.350e-08 8.080e-09
25- 50 4.631e-09 2.768e-09
50-150 1.088e-09 1.224e-09
15-150 1.922e-08 1.093e-08
Webpage updated on:
Mon Jul 31 16:14:48 EDT 2017