batgrbproduct analysis for trigger=773509
batgrbproduct Analysis for Trigger=773509
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 Sep 22 17:29:43 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger773509/GCN5_download_cron
======================================================================
Trigger: 00773509 Segment: 000
BAT Trigger Time: 527696948.224 [s; MET]
Trigger Stop: 527696952.32 [s; MET]
UTC: 2017-09-21T14:28:48.502900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 26.8495479369481 Dec: 30.8742207954133 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 16.8819430161341 [ if not an image trigger ]
Image S/N Ratio: 10.2
Flight Position: [ source = BAT ]
RA: 26.8495479369481 Dec: 30.8742207954133 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 26.8390787945212 Dec: 30.8779566156432 [deg; J2000]
{ 01h 47m 21.4s , +30d 52' 40.6" }
+/- 1.84221512711994 [arcmin] (estimated 90% radius based on SNR)
+/- 0.79923537976405 [arcmin] (formal 1-sigma fit error)
SNR: 12.7075183498901
Angular difference between Flight and Ground position is 0.583867 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 28.9279999732971 +/- 5.9833154629927
Measured from: -18.4239998459816
to: 10.5040001273155 [s; relative to TRIGTIME]
T50: 7.80800002813339 +/- 5.94959091543058
Measured from: -1.91199988126755
to: 5.89600014686584 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.74000000953674
to: 3.74000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.8159999847412
to: 13 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.362098 0.534414 0.244627 0.038541
0.041441 0.042656 0.037130 0.032303 [error]
Peak 0.038756 0.030203 0.028643 0.011089
0.007225 0.007723 0.006848 0.005712 [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 1.17e-07 1.85e-07 2.19e-07 5.03e-07 6.67e-07 1.02e-06 erg/cm2
Error 1.71e-08 1.87e-08 3.42e-08 1.56e-07 8.11e-08 1.91e-07 erg/cm2
Peak flux Power-law 2.95e-01 2.72e-01 1.73e-01 1.70e-01 8.10e-01 9.09e-01 ph/cm2/s
Error 1.01e-01 5.84e-02 5.83e-02 1.17e-01 1.73e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.00e-07 2.21e-07 2.06e-07 6.29e-08 5.78e-07 5.91e-07 erg/cm2
Error 2.00e-08 2.77e-08 4.45e-08 -------- 8.55e-08 1.14e-07 erg/cm2
Peak flux Cutoff-PL 2.93e-01 2.72e-01 1.74e-01 1.71e-01 8.10e-01 9.10e-01 ph/cm2/s
Error 1.01e-01 5.82e-02 5.12e-02 1.55e-01 1.73e-01 2.08e-01 ph/cm2/s
Fluence Band 9.86e-08 2.22e-07 2.00e-07 1.37e-07 5.88e-07 6.59e-07 erg/cm2
Error 2.06e-08 2.97e-08 4.58e-08 1.62e-07 -------- 1.98e-07 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 1.756 0.173 - - 2.08e-03 2.43e-04 58.450 57
CPL 0.152 1.022 49.1 10.4 1.68e-02 3.78e-02 47.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.649 0.430 - - 6.21e-03 1.56e-03 55.790 57
CPL 2.623 0.947 202.6 0.0 2.06e-03 0.00e+00 55.440 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: 7.808000 sec.
T50 in the 50-300 keV band: 3.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.816 -21.816 13.000
T90 28.928 -18.424 10.504
T50 7.808 -1.912 5.896
Peak 1.000 2.740 3.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
26.8391 +30.8780 0.0152 14.0 86.5 1.1107 12.7 TRIG_00773509
------------------------------------------
Foreground time interval of the image:
-21.816 13.000 (delta_t = 34.816 [sec])
Background time interval of the image:
-239.224 -21.816 (delta_t = 217.408 [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 -21.816 sec. to 13.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75583 ( -0.170187 0.176406 )
Norm@50keV : 2.07552E-03 ( -0.000244372 0.000241025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.218580e-01
Photon flux (15-150 keV) in 34.82 sec: 0.281249 ( -0.0286016 0.0286077 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66664e-07 ( -8.03701e-08 8.19294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.816 sec. to 13.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.151999 ( -1.14332 0.901154 )
Epeak [keV] : 49.0521 ( -7.19796 13.6262 )
Norm@50keV : 1.67833E-02 ( -0.0167834 0.0588426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.67 using 59 PHA bins.
# Reduced chi-squared = 0.8513 for 56 degrees of freedom
# Null hypothesis probability = 7.781076e-01
Photon flux (15-150 keV) in 34.82 sec: 0.266389 ( -0.029404 0.029511 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78015e-07 ( -8.17225e-08 8.93342e-08 ) ergs/cm2
Band function
Time interval is from -21.816 sec. to 13.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.192678 ( -0.715555 1.35171 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 49.9486 ( -9.16399 12.2795 )
Norm@50keV : 1.56160E-02 ( -0.0103445 1.53528 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.70 using 59 PHA bins.
# Reduced chi-squared = 0.8673 for 55 degrees of freedom
# Null hypothesis probability = 7.470273e-01
Photon flux (15-150 keV) in 34.82 sec: 0.266402 ( 6.7336 -0.029376 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88378e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4324 (-1.16359 1.31689)
R^2/D10^2 : 8.50782E-02 (-0.0283775 0.0414903)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9315 for 57 degrees of freedom
# Null hypothesis probability = 6.222005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.144e-08 1.471e-08
25- 50 2.418e-07 2.956e-08
50-150 1.837e-07 4.163e-08
15-150 5.069e-07 6.302e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.8754 (-28.4458 52.9058)
Norm : 1.26919 (-0.163987 0.193427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.24 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 57 degrees of freedom
# Null hypothesis probability = 6.540862e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.155e-07 1.644e-08
25- 50 1.984e-07 2.356e-08
50-150 3.157e-07 1.363e-07
15-150 6.296e-07 1.462e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.39187 (-7.20233 3.5936)
R1^2/D10^2 : 0.226614 (-0.129342 -0.218126)
kT2 [keV] : 17.1266 (-17.1162 88.7354)
R2^2/D10^2 : 1.20608E-02 (-0.0103497 0.0664842)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8696 for 55 degrees of freedom
# Null hypothesis probability = 7.426388e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.807e-08 5.345e-08
25- 50 2.223e-07 1.163e-07
50-150 2.562e-07 1.392e-07
15-150 5.766e-07 2.923e-07
Peak spectrum fit
Power-law model
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64878 ( -0.412791 0.446309 )
Norm@50keV : 6.20790E-03 ( -0.00161498 0.00150836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.79 using 59 PHA bins.
# Reduced chi-squared = 0.9788 for 57 degrees of freedom
# Null hypothesis probability = 5.204056e-01
Photon flux (15-150 keV) in 1 sec: 0.810274 ( -0.172754 0.172761 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77408e-08 ( -1.5443e-08 1.59858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62252 ( -1.68586 0.208861 )
Epeak [keV] : 202.618 ( )
Norm@50keV : 2.06059E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 0.9900 for 56 degrees of freedom
# Null hypothesis probability = 4.960623e-01
Photon flux (15-150 keV) in 1 sec: 0.809872 ( -0.172563 0.172759 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75997e-08 ( -1.52989e-08 1.56604e-08 ) ergs/cm2
Band function
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32168 ( 1.3217 1.3217 )
beta : -1.64881 ( 1.64882 0.412764 )
Epeak [keV] : 22.8766 ( -22.8733 -22.8733 )
Norm@50keV : 1.41158E-02 ( -0.0141162 0.252644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.79 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.447755e-01
Photon flux (15-150 keV) in 1 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] : 12.8995 (-6.6651 9.72205)
R^2/D10^2 : 0.141080 (-0.120612 1.96265)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.72 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.201215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.705e-09 3.243e-09
25- 50 1.774e-08 9.681e-09
50-150 1.052e-08 6.831e-09
15-150 3.496e-08 1.814e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 189.496 (-126.336 -189.52)
Norm : 3.27037 (-0.708373 1.0165)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.90 using 59 PHA bins.
# Reduced chi-squared = 0.9983 for 57 degrees of freedom
# Null hypothesis probability = 4.786539e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.196e-09 4.716e-09
25- 50 1.567e-08 8.925e-09
50-150 3.379e-08 1.958e-08
15-150 5.766e-08 3.312e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10700 (-1.54819 2.05113)
R1^2/D10^2 : 3.67199 (-2.75392 8.05019)
kT2 [keV] : 31.2853 (-11.6429 45.7784)
R2^2/D10^2 : 6.28403E-03 (-0.00563413 0.0120067)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.64 using 59 PHA bins.
# Reduced chi-squared = 0.9570 for 55 degrees of freedom
# Null hypothesis probability = 5.655112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.065e-08 6.080e-09
25- 50 1.256e-08 6.720e-09
50-150 4.025e-08 2.520e-08
15-150 6.346e-08 3.595e-08
Plot creation:
Fri Sep 22 17:57:29 EDT 2017