batgrbproduct analysis for trigger=1115766
batgrbproduct Analysis for Trigger=1115766
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 v2.48
Process Start Time (local time): Tue Jul 12 20:44:22 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1115766/GCN5_download_cron
======================================================================
Trigger: 01115766 Segment: 000
BAT Trigger Time: 679256218.176 [s; MET]
Trigger Stop: 679256219.2 [s; MET]
UTC: 2022-07-11T18:16:28.698520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.993124762887 Dec: 24.6695933765762 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.6
Image Trigger?: NO
Rate S/N Ratio: 20.3715487874634 [ if not an image trigger ]
Image S/N Ratio: 9.6
Flight Position: [ source = BAT ]
RA: 261.993124762887 Dec: 24.6695933765762 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.017828001802 Dec: 24.6741879955625 [deg; J2000]
{ 17h 28m 04.3s , +24d 40' 27.1" }
+/- 1.27385701424955 [arcmin] (estimated 90% radius based on SNR)
+/- 0.545501738434836 [arcmin] (formal 1-sigma fit error)
SNR: 21.5251395646793
Angular difference between Flight and Ground position is 1.374812 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 88.6400001049042 +/- 19.9598956916698
Measured from: -29.6559998989105
to: 58.9840002059937 [s; relative to TRIGTIME]
T50: 41.6160000562668 +/- 15.2484785600719
Measured from: -1.22399985790253
to: 40.3920001983643 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0199999809265137
to: 0.980000019073486 [s; relative to TRIGTIME]
Total Fluence
Measured from: -37.7200000286102
to: 98.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.864341 3.861681 2.402281 0.602629
0.130858 0.134469 0.114873 0.095470 [error]
Peak 0.048905 0.163492 0.139366 0.047971
0.016258 0.018443 0.016291 0.013143 [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 1.05e-06 1.65e-06 1.96e-06 4.52e-06 5.98e-06 9.19e-06 erg/cm2
Error 7.88e-08 7.42e-08 1.18e-07 5.82e-07 2.78e-07 6.71e-07 erg/cm2
Peak flux Power-law 9.58e-01 1.00e+00 7.42e-01 8.86e-01 3.04e+00 3.59e+00 ph/cm2/s
Error 2.14e-01 1.52e-01 1.13e-01 2.48e-01 4.35e-01 4.93e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-06 1.69e-06 1.98e-06 3.19e-06 5.87e-06 7.87e-06 erg/cm2
Error 9.42e-08 8.85e-08 1.24e-07 1.28e-06 3.14e-07 1.62e-06 erg/cm2
Peak flux Cutoff-PL 6.69e-01 1.14e+00 9.30e-01 3.31e-01 2.99e+00 3.07e+00 ph/cm2/s
Error 2.47e-01 1.90e-01 1.58e-01 2.00e-01 4.38e-01 4.74e-01 ph/cm2/s
Fluence Band 9.50e-07 1.73e-06 1.93e-06 4.04e-06 5.85e-06 8.67e-06 erg/cm2
Error 1.07e-07 -------- 1.22e-07 -------- 2.96e-07 -------- erg/cm2
Peak flux Band 6.84e-01 1.14e+00 9.25e-01 3.45e-01 3.00e+00 3.09e+00 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 1.752 0.080 - - 4.74e-03 2.13e-04 52.050 57
CPL 1.523 0.295 102.2 -34.0 6.21e-03 2.20e-03 50.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.435 0.191 - - 2.48e-02 3.40e-03 88.170 57
CPL -0.159 0.986 76.2 21.1 1.37e-01 1.85e-01 77.030 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: 81.536000 sec.
T50 in the 50-300 keV band: 26.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 136.608 -37.720 98.888
T90 88.640 -29.656 58.984
T50 41.616 -1.224 40.392
Peak 1.000 -0.020 0.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.0178 +24.6742 0.0089 36.4 115.4 5.6753 21.5 TRIG_01115766
------------------------------------------
Foreground time interval of the image:
-37.720 13.925 (delta_t = 51.645 [sec])
Background time interval of the image:
-239.176 -129.046 (delta_t = 110.130 [sec])
-128.176 -37.720 (delta_t = 90.456 [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 -37.720 sec. to 98.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75242 ( -0.0794783 0.0801471 )
Norm@50keV : 4.74326E-03 ( -0.000213384 0.000212606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9131 for 57 degrees of freedom
# Null hypothesis probability = 6.609466e-01
Photon flux (15-150 keV) in 136.6 sec: 0.641943 ( -0.0293235 0.0293975 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97788e-06 ( -2.77099e-07 2.78045e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -37.720 sec. to 98.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52274 ( -0.324768 0.265473 )
Epeak [keV] : 102.155 ( -34.1481 -102.155 )
Norm@50keV : 6.20760E-03 ( -0.00159065 0.00280119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.8997 for 56 degrees of freedom
# Null hypothesis probability = 6.865227e-01
Photon flux (15-150 keV) in 136.6 sec: 0.633041 ( -0.031412 0.03147 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87026e-06 ( -3.14658e-07 3.12718e-07 ) ergs/cm2
Band function
Time interval is from -37.720 sec. to 98.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.399782 ( -2.10132 4.12913 )
beta : -1.85585 ( -0.204065 0.113541 )
Epeak [keV] : 37.9639 ( -14.3726 62.668 )
Norm@50keV : 3.56126E-02 ( -0.0379127 278.027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.70 using 59 PHA bins.
# Reduced chi-squared = 0.8674 for 55 degrees of freedom
# Null hypothesis probability = 7.468501e-01
Photon flux (15-150 keV) in 136.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85066e-06 ( -5.8497e-06 -2.95712e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9865 ( )
R^2/D10^2 : 0.112069 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 177.68 using 59 PHA bins.
# Reduced chi-squared = 3.1173 for 57 degrees of freedom
# Null hypothesis probability = 2.527102e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.476e-07 4.528e-08
25- 50 1.884e-06 9.767e-08
50-150 2.007e-06 1.878e-07
15-150 4.439e-06 2.172e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 121.265 (-19.9011 28.7085)
Norm : 2.69912 (-0.163311 0.173711)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.599e-07 7.185e-08
25- 50 1.720e-06 1.045e-07
50-150 3.086e-06 8.305e-07
15-150 5.766e-06 8.708e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34511 (-0.891512 0.930595)
R1^2/D10^2 : 0.659923 (-0.218898 0.374001)
kT2 [keV] : 27.4741 (-4.39321 6.74057)
R2^2/D10^2 : 5.31741E-03 (-0.00284262 0.0049088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.095e-07 1.132e-07
25- 50 1.766e-06 1.940e-07
50-150 3.188e-06 6.564e-07
15-150 5.863e-06 8.401e-07
Peak spectrum fit
Power-law model
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43481 ( -0.190136 0.191718 )
Norm@50keV : 2.47873E-02 ( -0.00340007 0.00339946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.17 using 59 PHA bins.
# Reduced chi-squared = 1.547 for 57 degrees of freedom
# Null hypothesis probability = 5.071025e-03
Photon flux (15-150 keV) in 1 sec: 3.04343 ( -0.434664 0.435866 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37866e-07 ( -3.39777e-08 3.40447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.159339 ( -1.10131 0.87076 )
Epeak [keV] : 76.2252 ( -13.8818 28.3592 )
Norm@50keV : 0.136513 ( -0.0811342 0.288149 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.03 using 59 PHA bins.
# Reduced chi-squared = 1.375 for 56 degrees of freedom
# Null hypothesis probability = 3.267226e-02
Photon flux (15-150 keV) in 1 sec: 2.98609 ( -0.43677 0.43855 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38702e-07 ( -3.5766e-08 3.5541e-08 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.159298 ( -0.72477 1.21979 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 76.2136 ( -12.5497 28.2707 )
Norm@50keV : 0.136525 ( -0.0811446 0.288572 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.03 using 59 PHA bins.
# Reduced chi-squared = 1.401 for 55 degrees of freedom
# Null hypothesis probability = 2.661304e-02
Photon flux (15-150 keV) in 1 sec: 2.99842 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.4269 (-2.42334 2.78909)
R^2/D10^2 : 0.235999 (-0.0963685 0.161109)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.449e-08 3.584e-09
25- 50 6.539e-08 1.169e-08
50-150 1.429e-07 3.270e-08
15-150 2.228e-07 4.055e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.9088 -200)
Norm : 12.9637 (-1.76094 1.76094)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.229e-08 1.854e-08
25- 50 6.211e-08 3.417e-08
50-150 1.362e-07 7.664e-08
15-150 2.306e-07 1.299e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.45670 (-3.47702 47.8239)
R1^2/D10^2 : 1.08541 (-0.875965 9.88105)
kT2 [keV] : 22.3717 (-5.13143 33.7057)
R2^2/D10^2 : 7.84295E-02 (-0.0764475 0.150497)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.179e-08 1.250e-08
25- 50 6.653e-08 3.483e-08
50-150 1.528e-07 8.675e-08
15-150 2.411e-07 1.270e-07
Plot creation:
Tue Jul 12 20:47:49 EDT 2022