batgrbproduct analysis for trigger=1186291
batgrbproduct Analysis for Trigger=1186291
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): Mon Aug 21 20:32:51 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186291/GCN5_download_cron
======================================================================
Trigger: 01186291 Segment: 000
BAT Trigger Time: 714251408 [s; MET]
Trigger Stop: 714251616 [s; MET]
UTC: 2023-08-20T19:09:36.138420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.3208600413091 Dec: 22.9876882201213 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 20.05
Flight Position: [ source = BAT ]
RA: 84.3208600413091 Dec: 22.9876882201213 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.3132097659872 Dec: 22.9681737926187 [deg; J2000]
{ 05h 37m 15.2s , +22d 58' 05.4" }
+/- 1.41178196062932 [arcmin] (estimated 90% radius based on SNR)
+/- 0.694642676465941 [arcmin] (formal 1-sigma fit error)
SNR: 18.5850881482799
Angular difference between Flight and Ground position is 1.244795 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 106 +/- 9.8488578017961
Measured from: 3.00000011920929
to: 109.000000119209 [s; relative to TRIGTIME]
T50: 55 +/- 6.40312423743285
Measured from: 23.0000001192093
to: 78.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1
to: 2 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 124 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.068817 1.906522 0.799526 0.137587
0.064920 0.066467 0.056251 0.047646 [error]
Peak 0.016349 0.025845 0.007507 0.010053
0.005906 0.006005 0.005071 0.004317 [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 6.22e-07 7.42e-07 6.39e-07 9.38e-07 2.33e-06 2.94e-06 erg/cm2
Error 4.49e-08 3.37e-08 5.39e-08 1.61e-07 1.19e-07 2.14e-07 erg/cm2
Peak flux Power-law 1.92e-01 1.48e-01 7.60e-02 5.64e-02 4.41e-01 4.72e-01 ph/cm2/s
Error 7.92e-02 4.47e-02 4.01e-02 6.65e-02 1.32e-01 1.46e-01 ph/cm2/s
Fluence Cutoff-PL 6.01e-07 7.63e-07 6.26e-07 5.41e-07 2.26e-06 2.53e-06 erg/cm2
Error 5.22e-08 4.30e-08 5.98e-08 3.61e-07 1.54e-07 4.10e-07 erg/cm2
Peak flux Cutoff-PL 1.90e-01 1.51e-01 7.59e-02 4.43e-02 4.39e-01 4.60e-01 ph/cm2/s
Error 7.53e-02 5.72e-02 5.92e-02 4.64e-02 1.34e-01 1.54e-01 ph/cm2/s
Fluence Band 5.76e-07 7.73e-07 6.06e-07 7.62e-07 2.25e-06 2.72e-06 erg/cm2
Error 5.67e-08 4.59e-08 6.20e-08 -------- 1.38e-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 2.216 0.099 - - 2.02e-03 1.19e-04 53.590 57
CPL 1.915 0.325 11.7 14.6 2.99e-03 1.48e-03 51.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.957 0.611 - - 3.00e-03 1.21e-03 55.100 57
CPL 1.805 2.613 53.0 0.0 3.69e-03 0.00e+00 55.090 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 124.000 0.000 124.000
T90 106.000 3.000 109.000
T50 55.000 23.000 78.000
Peak 1.000 1.000 2.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.3132 +22.9682 0.0104 12.4 144.6 3.6638 18.6 TRIG_01186291
------------------------------------------
Foreground time interval of the image:
0.000 95.520 (delta_t = 95.520 [sec])
97.000 124.000 (delta_t = 27.000 [sec])
Background time interval of the image:
-60.000 0.000 (delta_t = 60.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 95.520000
97.000000 124.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21595 ( -0.0974449 0.0998513 )
Norm@50keV : 2.02268E-03 ( -0.000120166 0.000118819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.59 using 59 PHA bins.
# Reduced chi-squared = 0.9403 for 57 degrees of freedom
# Null hypothesis probability = 6.036247e-01
Photon flux (15-150 keV) in 122.5 sec: 0.337695 ( -0.0160697 0.016115 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.335e-06 ( -1.1856e-07 1.19581e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 95.520000
97.000000 124.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91542 ( -0.430367 0.219899 )
Epeak [keV] : 11.7391 ( -9.46034 19.7435 )
Norm@50keV : 2.99386E-03 ( -0.000737157 0.00223065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.80 using 59 PHA bins.
# Reduced chi-squared = 0.9250 for 56 degrees of freedom
# Null hypothesis probability = 6.345089e-01
Photon flux (15-150 keV) in 122.5 sec: 0.330955 ( -0.018055 0.018079 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25554e-06 ( -1.5277e-07 1.5484e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 95.520000
97.000000 124.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19332 ( -0.599342 3.71724 )
beta : -2.38131 ( 2.38188 0.185394 )
Epeak [keV] : 25.9297 ( -11.05 5.74594 )
Norm@50keV : 9.19023E-03 ( -0.00598922 559.038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.67 using 59 PHA bins.
# Reduced chi-squared = 0.9031 for 55 degrees of freedom
# Null hypothesis probability = 6.778178e-01
Photon flux (15-150 keV) in 122.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25116e-06 ( -2.2503e-06 -1.38413e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.10227 ( )
R^2/D10^2 : 0.206746 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.54 using 59 PHA bins.
# Reduced chi-squared = 2.4130 for 57 degrees of freedom
# Null hypothesis probability = 1.312847e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.109e-07 3.442e-08
25- 50 8.888e-07 4.508e-08
50-150 3.510e-07 4.808e-08
15-150 1.651e-06 9.126e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.0334 (-6.41372 8.24099)
Norm : 1.85115 (-0.160837 0.193316)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.546e-07 3.932e-08
25- 50 7.967e-07 3.822e-08
50-150 7.740e-07 9.733e-08
15-150 2.125e-06 1.188e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.14103 (-0.745992 0.732083)
R1^2/D10^2 : 0.792485 (-0.270663 0.501827)
kT2 [keV] : 21.4772 (-4.04591 6.0856)
R2^2/D10^2 : 4.50164E-03 (-0.00274538 0.00605761)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.502e-07 7.883e-08
25- 50 7.750e-07 9.849e-08
50-150 9.070e-07 3.243e-07
15-150 2.232e-06 4.416e-07
Peak spectrum fit
Power-law model
Time interval is from 1.000 sec. to 2.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95696 ( -0.552145 0.670664 )
Norm@50keV : 3.00110E-03 ( -0.00125984 0.00116407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
# Reduced chi-squared = 0.9668 for 57 degrees of freedom
# Null hypothesis probability = 5.465029e-01
Photon flux (15-150 keV) in 1 sec: 0.441485 ( -0.131826 0.131844 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76244e-08 ( -1.02976e-08 1.10342e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 2.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80493 ( -4.16481 1.06069 )
Epeak [keV] : 53.0205 ( )
Norm@50keV : 3.68872E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.09 using 59 PHA bins.
# Reduced chi-squared = 0.9838 for 56 degrees of freedom
# Null hypothesis probability = 5.092842e-01
Photon flux (15-150 keV) in 1 sec: 0.439450 ( -0.134411 0.133336 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71728e-08 ( -1.13511e-08 1.1379e-08 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 2.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75514 ( -0.2432 1.99183 )
beta : -9.37113 ( 9.37164 19.3716 )
Epeak [keV] : 55.5062 ( -47.0845 -53.4976 )
Norm@50keV : 3.87629E-03 ( -0.00115857 0.0049736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.710719e-01
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 9.24208 (-2.72613 4.30364)
R^2/D10^2 : 0.280719 (-0.28049 0.783289)
(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 4.730e-09 2.852e-09
25- 50 1.047e-08 6.460e-09
50-150 4.331e-09 3.283e-09
15-150 1.954e-08 1.214e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.1638 (-42.6008 -70.1638)
Norm : 2.17616 (-0.807777 1.58453)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.585e-09 3.434e-09
25- 50 8.891e-09 5.315e-09
50-150 1.144e-08 1.022e-08
15-150 2.592e-08 1.794e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.33877 (-1.72475 39.0719)
R1^2/D10^2 : 8932.03 (-8933.01 9.30276e+10)
kT2 [keV] : 10.6948 (-3.45043 -10.6959)
R2^2/D10^2 : 0.149565 (-0.149509 0.188432)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.077e-09 2.403e-09
25- 50 9.458e-09 5.690e-09
50-150 6.556e-09 4.576e-09
15-150 2.109e-08 1.237e-08
Plot creation:
Mon Aug 21 20:34:46 EDT 2023