batgrbproduct analysis for trigger=791201
batgrbproduct Analysis for Trigger=791201
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 Nov 21 10:25:21 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger791201/GCN5_download_cron
======================================================================
Trigger: 00791201 Segment: 000
BAT Trigger Time: 532876822.528 [s; MET]
Trigger Stop: 532876822.784 [s; MET]
UTC: 2017-11-20T13:20:02.497620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 163.78729657664 Dec: 22.4495879527507 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.59
Image Trigger?: NO
Rate S/N Ratio: 121.482509029078 [ if not an image trigger ]
Image S/N Ratio: 15.59
Flight Position: [ source = BAT ]
RA: 163.78729657664 Dec: 22.4495879527507 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 163.774315474485 Dec: 22.4606025478875 [deg; J2000]
{ 10h 55m 05.8s , +22d 27' 38.2" }
+/- 1.21726212675524 [arcmin] (estimated 90% radius based on SNR)
+/- 0.563977973359772 [arcmin] (formal 1-sigma fit error)
SNR: 22.9689467148025
Angular difference between Flight and Ground position is 0.977183 arcmin
Partial Coding Fraction: 0.1484375 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -15.5279998779297
to: 48.4720001220703 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 0.472000122070312
to: 32.4720001220703 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 39.972000002861
to: 40.972000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.527999997139
to: 64.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.013253 4.603348 3.729931 1.084553
0.129421 0.140957 0.127269 0.109060 [error]
Peak 0.286638 0.443339 0.296232 0.067467
0.012093 0.014251 0.012326 0.007950 [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 1.41e-06 2.35e-06 2.96e-06 7.45e-06 8.80e-06 1.42e-05 erg/cm2
Error 9.39e-08 9.35e-08 1.30e-07 7.12e-07 3.23e-07 7.95e-07 erg/cm2
Peak flux Power-law 4.73e+00 3.82e+00 2.09e+00 1.67e+00 1.14e+01 1.23e+01 ph/cm2/s
Error 3.19e-01 1.62e-01 1.05e-01 1.65e-01 4.93e-01 4.97e-01 ph/cm2/s
Fluence Cutoff-PL 1.22e-06 2.44e-06 3.14e-06 3.84e-06 8.56e-06 1.06e-05 erg/cm2
Error 1.21e-07 1.05e-07 1.55e-07 1.08e-06 3.43e-07 1.11e-06 erg/cm2
Peak flux Cutoff-PL 3.92e+00 4.09e+00 2.28e+00 8.02e-01 1.08e+01 1.11e+01 ph/cm2/s
Error 3.99e-01 1.93e-01 1.29e-01 2.02e-01 5.18e-01 5.72e-01 ph/cm2/s
Fluence Band 1.22e-06 2.43e-06 3.13e-06 3.93e-06 8.56e-06 1.07e-05 erg/cm2
Error -------- -------- -------- -------- 3.39e-07 -------- erg/cm2
Peak flux Band 3.73e+00 4.17e+00 2.22e+00 1.10e+00 1.07e+01 1.12e+01 ph/cm2/s
Error 4.38e-01 2.12e-01 1.34e-01 -------- 5.29e-01 5.78e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.665 0.063 - - 1.18e-02 4.23e-04 70.860 57
CPL 1.059 0.281 86.0 19.0 2.24e-02 6.63e-03 55.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.873 0.067 - - 8.02e-02 3.27e-03 70.210 57
CPL 0.971 0.330 59.2 6.2 2.21e-01 8.41e-02 43.850 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: 43.712000 sec.
T50 in the 50-300 keV band: 38.912000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 -15.528 64.472
T90 64.000 -15.528 48.472
T50 32.000 0.472 32.472
Peak 1.000 39.972 40.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
163.7743 +22.4606 0.0084 55.2 -10.7 5.2030 23.0 TRIG_00791201
------------------------------------------
Foreground time interval of the image:
-15.528 8.773 (delta_t = 24.301 [sec])
Background time interval of the image:
-239.528 -15.528 (delta_t = 224.000 [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 -15.528 sec. to 64.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66545 ( -0.0627465 0.0630636 )
Norm@50keV : 1.18427E-02 ( -0.000422763 0.000422662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.86 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.026334e-01
Photon flux (15-150 keV) in 80 sec: 1.55434 ( -0.0619123 0.062157 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.79816e-06 ( -3.22411e-07 3.22677e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.528 sec. to 64.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05949 ( -0.289709 0.273018 )
Epeak [keV] : 85.9748 ( -11.8525 26.0639 )
Norm@50keV : 2.24322E-02 ( -0.00548333 0.00777071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 0.9923 for 56 degrees of freedom
# Null hypothesis probability = 4.910347e-01
Photon flux (15-150 keV) in 80 sec: 1.49082 ( -0.06678 0.06722 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.55848e-06 ( -3.4376e-07 3.4288e-07 ) ergs/cm2
Band function
Time interval is from -15.528 sec. to 64.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05960 ( -0.261468 0.307837 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 85.9665 ( -11.3631 26.0577 )
Norm@50keV : 2.24276E-02 ( -0.00549062 0.00777641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.530793e-01
Photon flux (15-150 keV) in 80 sec: 1.49008 ( 5.50992 -0.05728 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.56464e-06 ( -8.56408e-06 -3.5632e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8814 ( )
R^2/D10^2 : 0.137663 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 187.73 using 59 PHA bins.
# Reduced chi-squared = 3.2935 for 57 degrees of freedom
# Null hypothesis probability = 7.381887e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.753e-07 4.132e-08
25- 50 2.405e-06 1.052e-07
50-150 4.228e-06 2.612e-07
15-150 7.209e-06 3.092e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.526 (-24.1176 31.9469)
Norm : 6.32211 (-0.279474 0.299267)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.584070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.287e-06 8.080e-08
25- 50 2.411e-06 1.696e-07
50-150 4.904e-06 1.238e-06
15-150 8.602e-06 1.370e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.44094 (-1.15111 1.29941)
R1^2/D10^2 : 1.96273 (-0.924754 2.24577)
kT2 [keV] : 22.2165 (-2.08071 2.87778)
R2^2/D10^2 : 3.32108E-02 (-0.0131932 0.0166888)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.28 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.905783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.193e-06 1.860e-07
25- 50 2.388e-06 2.156e-07
50-150 4.873e-06 4.504e-07
15-150 8.454e-06 6.588e-07
Peak spectrum fit
Power-law model
Time interval is from 39.972 sec. to 40.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87297 ( -0.0664507 0.0673196 )
Norm@50keV : 8.02005E-02 ( -0.00327793 0.00327105 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.21 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 57 degrees of freedom
# Null hypothesis probability = 1.123095e-01
Photon flux (15-150 keV) in 1 sec: 11.3798 ( -0.492316 0.493784 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37287e-07 ( -3.0128e-08 3.0154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 39.972 sec. to 40.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.970515 ( -0.342818 0.318167 )
Epeak [keV] : 59.2365 ( -5.13673 7.23509 )
Norm@50keV : 0.221365 ( -0.0656053 0.102647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.85 using 59 PHA bins.
# Reduced chi-squared = 0.7831 for 56 degrees of freedom
# Null hypothesis probability = 8.807854e-01
Photon flux (15-150 keV) in 1 sec: 10.8348 ( -0.517 0.5199 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1069e-07 ( -3.215e-08 3.1965e-08 ) ergs/cm2
Band function
Time interval is from 39.972 sec. to 40.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.598227 ( -0.487928 0.631061 )
beta : -2.44152 ( 2.44449 0.251401 )
Epeak [keV] : 52.4234 ( -6.70659 8.28198 )
Norm@50keV : 0.360786 ( -0.16256 0.464793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.30 using 59 PHA bins.
# Reduced chi-squared = 0.7510 for 55 degrees of freedom
# Null hypothesis probability = 9.144032e-01
Photon flux (15-150 keV) in 1 sec: 10.7067 ( -3.7067 -0.5268 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08596e-07 ( -7.08589e-07 -3.1424e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.3749 ( )
R^2/D10^2 : 1.83990 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.77 using 59 PHA bins.
# Reduced chi-squared = 2.3644 for 57 degrees of freedom
# Null hypothesis probability = 3.038440e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.975e-08 5.055e-09
25- 50 2.476e-07 1.170e-08
50-150 2.846e-07 2.190e-08
15-150 6.019e-07 2.810e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.3935 (-11.6141 14.2196)
Norm : 50.2260 (-2.92965 3.12105)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8188 for 57 degrees of freedom
# Null hypothesis probability = 8.337623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.313e-07 1.030e-08
25- 50 2.262e-07 1.075e-08
50-150 3.632e-07 9.080e-08
15-150 7.208e-07 9.640e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.69573 (-1.51346 1.29775)
R1^2/D10^2 : 6.24315 (-2.01901 4.59722)
kT2 [keV] : 25.1568 (-5.00186 8.31716)
R2^2/D10^2 : 0.100413 (-0.0667515 0.166674)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9220 for 55 degrees of freedom
# Null hypothesis probability = 6.391987e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.012e-07 1.404e-08
25- 50 2.441e-07 2.710e-08
50-150 3.559e-07 1.116e-07
15-150 7.012e-07 1.390e-07
Plot creation:
Tue Nov 21 10:32:22 EST 2017