batgrbproduct analysis for trigger=751928
batgrbproduct Analysis for Trigger=751928
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): Tue May 9 08:50:56 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger751928/GCN5_download_cron
======================================================================
Trigger: 00751928 Segment: 000
BAT Trigger Time: 515939000 [s; MET]
Trigger Stop: 515939392 [s; MET]
UTC: 2017-05-08T12:23:00.971640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.362858513274 Dec: -60.6306597869344 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.46
Flight Position: [ source = BAT ]
RA: 170.362858513274 Dec: -60.6306597869344 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.370927443951 Dec: -60.6159826882794 [deg; J2000]
{ 11h 21m 29.0s , -60d 36' 57.5" }
+/- 1.90750390067633 [arcmin] (estimated 90% radius based on SNR)
+/- 0.823656932738675 [arcmin] (formal 1-sigma fit error)
SNR: 12.0907564552978
Angular difference between Flight and Ground position is 0.912088 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 392 +/-
Measured from: 0
to: 392 [s; relative to TRIGTIME]
T50: 392 +/-
Measured from: 0
to: 392 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 392 second)
Measured from: 0
to: 392 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 392 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.756843 0.744630 -0.051761 0.053214
0.110784 0.112710 0.099954 0.096171 [error]
Peak 2.756843 0.744630 -0.051761 0.053214
0.110784 0.112710 0.099954 0.096171 [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 7.97e-07 3.10e-07 7.02e-08 1.92e-08 1.19e-06 1.20e-06 erg/cm2
Error 8.64e-08 5.98e-08 3.10e-08 1.49e-08 1.29e-07 1.32e-07 erg/cm2
Peak flux Power-law 7.03e-02 1.57e-02 1.78e-03 2.22e-04 8.79e-02 8.80e-02 ph/cm2/s
Error 7.86e-03 2.85e-03 7.60e-04 1.64e-04 8.67e-03 8.67e-03 ph/cm2/s
Fluence Cutoff-PL 7.99e-07 3.02e-07 3.60e-08 1.29e-09 1.14e-06 1.14e-06 erg/cm2
Error 8.87e-08 7.23e-08 4.86e-08 1.65e-08 1.42e-07 1.47e-07 erg/cm2
Peak flux Cutoff-PL 7.02e-02 1.55e-02 9.60e-04 1.82e-05 8.66e-02 8.66e-02 ph/cm2/s
Error 8.07e-03 3.34e-03 1.22e-03 1.87e-04 6.66e-03 6.66e-03 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 4.142 0.377 - - 1.26e-04 4.30e-05 66.830 57
CPL 1.000 0.000 50.0 0.0 1.09e-03 0.00e+00 214.730 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.142 0.377 - - 1.26e-04 4.30e-05 66.830 57
CPL 1.000 0.000 50.0 0.0 1.09e-03 0.00e+00 214.730 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 392.000 0.000 392.000
T90 392.000 0.000 392.000
T50 392.000 0.000 392.000
Peak 392.000 0.000 392.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.3709 -60.6160 0.0158 4.0 129.2 3.5217 12.1 TRIG_00751928
------------------------------------------
Foreground time interval of the image:
0.000 74.280 (delta_t = 74.280 [sec])
75.000 217.170 (delta_t = 142.170 [sec])
219.000 222.300 (delta_t = 3.300 [sec])
225.000 226.220 (delta_t = 1.220 [sec])
227.000 392.000 (delta_t = 165.000 [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 74.280000
75.000000 217.170000
219.000000 222.300000
225.000000 226.220000
227.000000 392.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.14226 ( -0.360939 0.393037 )
Norm@50keV : 1.25822E-04 ( -3.89326e-05 4.70604e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.750231e-01
Photon flux (15-150 keV) in 386 sec: 8.79416E-02 ( -0.0086688 0.00867043 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1887e-06 ( -1.27136e-07 1.30075e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 74.280000
75.000000 217.170000
219.000000 222.300000
225.000000 226.220000
227.000000 392.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.08862E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 214.73 using 59 PHA bins.
# Reduced chi-squared = 3.8345 for 56 degrees of freedom
# Null hypothesis probability = 1.960715e-20
Photon flux (15-150 keV) in 386 sec: 8.66415E-02 ( -0.0088426 0.0044784 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13795e-06 ( -1.33097e-07 1.51609e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 74.280000
75.000000 217.170000
219.000000 222.300000
225.000000 226.220000
227.000000 392.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.93065 ( 1.91114 1.91114 )
beta : -4.48910 ( 9.37167 19.3657 )
Epeak [keV] : 0.664460 ( -0.66446 7.79641 )
Norm@50keV : 8.11332E-03 ( -0.00345042 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.646618e-01
Photon flux (15-150 keV) in 386 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] : 3.55516 (-0.3561 0.416092)
R^2/D10^2 : 4.24917 (-2.02719 3.86148)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.18 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.806483e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.177e-07 1.689e-07
25- 50 2.081e-07 5.473e-08
50-150 1.187e-09 8.789e-10
15-150 1.027e-06 2.038e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.47677 (-1.46288 1.92301)
Norm : 4.24780 (-1.58405 2.69573)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.699783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.034e-07 1.270e-07
25- 50 2.730e-07 6.734e-08
50-150 1.157e-08 7.340e-09
15-150 1.088e-06 1.691e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.94933 (-0.546808 0.519817)
R1^2/D10^2 : 10.9676 (-6.71118 26.4003)
kT2 [keV] : 8.29344 (-2.86929 4.57956)
R2^2/D10^2 : 2.19057E-02 (-0.0209171 0.14741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.133200e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.193e-07 4.273e-07
25- 50 2.985e-07 1.640e-07
50-150 5.941e-08 3.893e-08
15-150 1.177e-06 5.861e-07
Peak spectrum fit
Power-law model
Time interval is from 227.000 sec. to 392.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.14226 ( -0.360939 0.393037 )
Norm@50keV : 1.25822E-04 ( -3.89326e-05 4.70604e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.750231e-01
Photon flux (15-150 keV) in 386 sec: 8.79416E-02 ( -0.0086688 0.00867043 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1887e-06 ( -1.27136e-07 1.30075e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 227.000 sec. to 392.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.08862E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 214.73 using 59 PHA bins.
# Reduced chi-squared = 3.8345 for 56 degrees of freedom
# Null hypothesis probability = 1.960715e-20
Photon flux (15-150 keV) in 386 sec: 8.66415E-02 ( -0.0088426 0.0044784 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13795e-06 ( -1.33097e-07 1.51609e-07 ) ergs/cm2
Band function
Time interval is from 227.000 sec. to 392.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.93065 ( 1.91114 1.91114 )
beta : -4.48910 ( 9.37167 19.3657 )
Epeak [keV] : 0.664460 ( -0.66446 7.79267 )
Norm@50keV : 8.11332E-03 ( -0.00345042 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.646618e-01
Photon flux (15-150 keV) in 386 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] : 3.55516 (-0.3561 0.416092)
R^2/D10^2 : 4.24917 (-2.02719 3.86148)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.18 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.806483e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.177e-07 1.461e-07
25- 50 2.081e-07 5.381e-08
50-150 1.187e-09 8.402e-10
15-150 1.027e-06 2.106e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.47677 (-1.46288 1.92301)
Norm : 4.24780 (-1.58405 2.69573)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.699783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.034e-07 1.366e-07
25- 50 2.730e-07 6.541e-08
50-150 1.157e-08 7.193e-09
15-150 1.088e-06 1.677e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.94933 (-0.546808 0.519817)
R1^2/D10^2 : 10.9676 (-6.71118 26.4003)
kT2 [keV] : 8.29344 (-2.86929 4.57956)
R2^2/D10^2 : 2.19057E-02 (-0.0209171 0.14741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.133200e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.193e-07 4.246e-07
25- 50 2.985e-07 1.630e-07
50-150 5.941e-08 3.798e-08
15-150 1.177e-06 5.925e-07
Plot creation:
Tue May 9 09:05:03 EDT 2017