batgrbproduct analysis for trigger=779171
batgrbproduct Analysis for Trigger=779171
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): Mon Oct 16 19:41:37 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger779171/GCN5_download_cron
======================================================================
Trigger: 00779171 Segment: 000
BAT Trigger Time: 529787682.432 [s; MET]
Trigger Stop: 529787683.456 [s; MET]
UTC: 2017-10-15T19:14:22.586340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 78.4847045669015 Dec: 62.382994964026 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.9
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 5.9
Flight Position: [ source = BAT ]
RA: 78.4847045669015 Dec: 62.382994964026 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 78.4000020243108 Dec: 62.4216801793157 [deg; J2000]
{ 05h 13m 36.0s , +62d 25' 18.0" }
+/- 3.80177917236671 [arcmin] (estimated 90% radius based on SNR)
+/- 1.98431758329086 [arcmin] (formal 1-sigma fit error)
SNR: 4.51404292022784
Angular difference between Flight and Ground position is 3.306140 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 2.98023223876953e-08
to: 1.02400001883507 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.012876 0.028323 0.000693 0.001625
0.006999 0.007044 0.005655 0.005037 [error]
Peak 0.012876 0.028323 0.000693 0.001625
0.006999 0.007044 0.005655 0.005037 [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 5.92e-09 6.47e-09 5.03e-09 6.43e-09 1.98e-08 2.38e-08 erg/cm2
Error 3.11e-09 4.83e-09 5.00e-09 1.21e-08 1.11e-08 1.84e-08 erg/cm2
Peak flux Power-law 1.90e-01 1.15e-01 4.49e-02 2.34e-02 3.62e-01 3.74e-01 ph/cm2/s
Error 1.02e-01 5.70e-02 3.81e-02 4.03e-02 1.64e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 3.78e-09 1.12e-08 1.03e-09 1.28e-13 1.60e-08 1.60e-08 erg/cm2
Error 3.47e-09 5.48e-09 3.22e-09 1.51e-09 7.18e-09 6.68e-09 erg/cm2
Peak flux Cutoff-PL 1.12e-01 2.02e-01 1.12e-02 7.41e-07 3.25e-01 3.26e-01 ph/cm2/s
Error 1.28e-01 9.55e-02 2.98e-02 6.51e-03 1.52e-01 1.51e-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 2.362 0.946 - - 2.00e-03 1.34e-03 65.490 57
CPL -7.255 0.974 32.5 7.9 2.74e+03 1.05e+05 62.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.362 0.946 - - 2.00e-03 1.34e-03 65.490 57
CPL -7.255 0.974 32.5 7.9 2.74e+03 1.05e+05 62.360 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
78.4000 +62.4217 0.0427 30.6 -6.1 0.0542 4.5 TRIG_00779171
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-239.432 -56.468 (delta_t = 182.964 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36229 ( -0.775234 1.11714 )
Norm@50keV : 2.00240E-03 ( -0.00133635 0.00135329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.060202e-01
Photon flux (15-150 keV) in 1.024 sec: 0.362470 ( -0.163497 0.163955 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98316e-08 ( -1.04207e-08 1.17968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.25525 ( 7.29501 9.2429 )
Epeak [keV] : 32.4550 ( -7.05498 8.662 )
Norm@50keV : 2744.59 ( -3142.07 206190 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.604989e-01
Photon flux (15-150 keV) in 1.024 sec: 0.325015 ( -0.140397 0.16281 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59955e-08 ( -6.7385e-09 7.61979e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -14.3038 -5 )
beta : -7.47076 ( 7.59183 17.3961 )
Epeak [keV] : 32.0691 ( -7.1543 7.76416 )
Norm@50keV : 109.241 ( -44.235 869.313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.44 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 55 degrees of freedom
# Null hypothesis probability = 2.287625e-01
Photon flux (15-150 keV) in 1.024 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] : 7.76952 (-2.30915 3.22923)
R^2/D10^2 : 0.509251 (-0.508228 1.55881)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.669248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.565e-09 3.556e-09
25- 50 9.252e-09 5.960e-09
50-150 2.205e-09 1.936e-09
15-150 1.702e-08 1.177e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.1979 (-20.3109 95.2481)
Norm : 2.72372 (-1.57645 4.04894)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.63 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.276465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.035e-09 3.882e-09
25- 50 7.384e-09 4.887e-09
50-150 4.769e-09 4.520e-09
15-150 1.819e-08 1.197e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.00093E-04 (-0.000100093 -0.000100093)
R1^2/D10^2 : 5.92367E-02 (-0.0592371 -0.0592371)
kT2 [keV] : 7.77307 (-2.30753 3.23087)
R2^2/D10^2 : 0.508374 (-0.508082 1.56353)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.20 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.091970e-01
# Null hypothesis probability = 2.094758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.450e-09 5.072e-04
25- 50 9.350e-09 4.650e-03
50-150 2.373e-09 9.805e-02
15-150 1.717e-08 1.134e-01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36229 ( -0.775234 1.11714 )
Norm@50keV : 2.00240E-03 ( -0.00133635 0.00135329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.060202e-01
Photon flux (15-150 keV) in 1.024 sec: 0.362470 ( -0.163497 0.163955 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98316e-08 ( -1.04207e-08 1.17968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.25525 ( 7.29501 9.2429 )
Epeak [keV] : 32.4550 ( -7.05498 8.662 )
Norm@50keV : 2744.59 ( -3142.07 206190 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.604989e-01
Photon flux (15-150 keV) in 1.024 sec: 0.325015 ( -0.140397 0.16281 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59955e-08 ( -6.7385e-09 7.61979e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.54924 -5 )
beta : -7.47076 ( 7.59183 17.3961 )
Epeak [keV] : 32.0691 ( -7.1543 7.76416 )
Norm@50keV : 109.241 ( -44.235 869.313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.44 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 55 degrees of freedom
# Null hypothesis probability = 2.287625e-01
Photon flux (15-150 keV) in 1.024 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] : 7.76952 (-2.30915 3.22923)
R^2/D10^2 : 0.509251 (-0.508228 1.55881)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.669248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.565e-09 3.545e-09
25- 50 9.252e-09 6.272e-09
50-150 2.205e-09 2.009e-09
15-150 1.702e-08 1.067e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.1979 (-20.3109 95.2481)
Norm : 2.72372 (-1.57645 4.04894)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.63 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.276465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.035e-09 3.934e-09
25- 50 7.384e-09 4.660e-09
50-150 4.769e-09 4.363e-09
15-150 1.819e-08 1.304e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.00093E-04 (-0.000100093 -0.000100093)
R1^2/D10^2 : 5.92367E-02 (-0.0592371 -0.0592371)
kT2 [keV] : 7.77307 (-2.30753 3.23087)
R2^2/D10^2 : 0.508374 (-0.508082 1.56353)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.20 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.091970e-01
# Null hypothesis probability = 2.094758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.450e-09 5.745e-04
25- 50 9.350e-09 4.643e-03
50-150 2.373e-09 1.180e-01
15-150 1.717e-08 1.316e-01
Plot creation:
Mon Oct 16 19:46:35 EDT 2017