batgrbproduct analysis for trigger=1186959
batgrbproduct Analysis for Trigger=1186959
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): Fri Aug 25 17:11:03 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186959/GCN5_download_cron
======================================================================
Trigger: 01186959 Segment: 000
BAT Trigger Time: 714578416 [s; MET]
Trigger Stop: 714578512 [s; MET]
UTC: 2023-08-24T13:59:44.116100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.941273062356 Dec: -16.2149452687354 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.27
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.27
Flight Position: [ source = BAT ]
RA: 261.941273062356 Dec: -16.2149452687354 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.997901373138 Dec: -16.1227107381406 [deg; J2000]
{ 17h 27m 59.5s , -16d 07' 21.8" }
+/- 4.19913020945603 [arcmin] (estimated 90% radius based on SNR)
+/- 1.78825505493522 [arcmin] (formal 1-sigma fit error)
SNR: 3.91643342956815
Angular difference between Flight and Ground position is 6.424570 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 118.080000042915 +/- 82.8262470696842
Measured from: 82.8320001363754
to: 200.912000179291 [s; relative to TRIGTIME]
T50: 54.9599999189377 +/- 44.7987978142357
Measured from: 121.088000178337
to: 176.048000097275 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.2039999961853
to: 18.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: 3.00800001621246
to: 205.679999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.262204 2.878872 1.967178 0.467332
0.104723 0.101338 0.085477 0.072982 [error]
Peak 0.037238 0.041485 0.019141 0.003416
0.007410 0.007602 0.006223 0.005193 [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 7.41e-07 1.21e-06 1.51e-06 3.70e-06 4.51e-06 7.17e-06 erg/cm2
Error 5.53e-08 5.36e-08 8.62e-08 4.60e-07 2.04e-07 5.22e-07 erg/cm2
Peak flux Power-law 3.85e-01 3.04e-01 1.61e-01 1.25e-01 9.06e-01 9.74e-01 ph/cm2/s
Error 1.14e-01 6.00e-02 5.27e-02 7.97e-02 1.80e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 6.66e-07 1.27e-06 1.55e-06 1.73e-06 4.31e-06 5.22e-06 erg/cm2
Error 6.88e-08 6.37e-08 9.41e-08 7.32e-07 2.34e-07 7.65e-07 erg/cm2
Peak flux Cutoff-PL 3.88e-01 3.04e-01 1.59e-01 1.22e-01 9.06e-01 9.78e-01 ph/cm2/s
Error 1.13e-01 6.00e-02 3.98e-02 1.09e-01 1.80e-01 2.01e-01 ph/cm2/s
Fluence Band 6.60e-07 1.27e-06 1.54e-06 1.75e-06 4.30e-06 5.23e-06 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 1.689 0.078 - - 2.40e-03 1.04e-04 60.020 57
CPL 1.122 0.343 77.7 25.9 4.58e-03 1.82e-03 50.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.912 0.389 - - 6.28e-03 1.55e-03 56.380 57
CPL 1.898 1.493 294.7 0.0 6.40e-03 0.00e+00 56.380 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 202.672 3.008 205.680
T90 118.080 82.832 200.912
T50 54.960 121.088 176.048
Peak 1.000 17.204 18.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.9979 -16.1227 0.0491 26.7 -158.8 2.4219 3.9 TRIG_01186959
------------------------------------------
Foreground time interval of the image:
3.008 205.680 (delta_t = 202.672 [sec])
Background time interval of the image:
-17.699 3.008 (delta_t = 20.707 [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 3.008 sec. to 205.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68878 ( -0.0775317 0.0781002 )
Norm@50keV : 2.39953E-03 ( -0.000103693 0.000103422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.667659e-01
Photon flux (15-150 keV) in 202.7 sec: 0.317446 ( -0.0140887 0.0141286 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50746e-06 ( -2.03758e-07 2.04543e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.008 sec. to 205.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12249 ( -0.356256 0.329281 )
Epeak [keV] : 77.6653 ( -13.1042 38.7573 )
Norm@50keV : 4.57997E-03 ( -0.00140649 0.00224318 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.95 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 56 degrees of freedom
# Null hypothesis probability = 6.658017e-01
Photon flux (15-150 keV) in 202.7 sec: 0.305679 ( -0.015453 0.015532 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30725e-06 ( -2.33794e-07 2.34179e-07 ) ergs/cm2
Band function
Time interval is from 3.008 sec. to 205.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12246 ( -0.286076 0.332771 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 77.6504 ( -10.6838 38.6819 )
Norm@50keV : 4.57969E-03 ( -0.00140771 0.00224478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.95 using 59 PHA bins.
# Reduced chi-squared = 0.9264 for 55 degrees of freedom
# Null hypothesis probability = 6.298985e-01
Photon flux (15-150 keV) in 202.7 sec: 0.306451 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30411e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0076 ( )
R^2/D10^2 : 4.30586E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.10 using 59 PHA bins.
# Reduced chi-squared = 2.4754 for 57 degrees of freedom
# Null hypothesis probability = 4.411914e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.617e-07 3.111e-08
25- 50 1.346e-06 6.872e-08
50-150 1.740e-06 1.493e-07
15-150 3.448e-06 1.794e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 142.526 (-26.9007 31.9504)
Norm : 1.30124 (-0.0664798 0.0820459)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.802e-07 5.189e-08
25- 50 1.251e-06 9.294e-08
50-150 2.417e-06 6.574e-07
15-150 4.349e-06 7.034e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17274 (-1.24091 1.46339)
R1^2/D10^2 : 0.476547 (-0.241028 0.64115)
kT2 [keV] : 20.5783 (-2.50676 3.94503)
R2^2/D10^2 : 8.56754E-03 (-0.00439012 0.00602862)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.490e-07 1.355e-07
25- 50 1.251e-06 1.465e-07
50-150 2.296e-06 3.268e-07
15-150 4.195e-06 5.017e-07
Peak spectrum fit
Power-law model
Time interval is from 17.204 sec. to 18.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91212 ( -0.366939 0.41019 )
Norm@50keV : 6.28223E-03 ( -0.00159087 0.00150104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 0.9890 for 57 degrees of freedom
# Null hypothesis probability = 4.984610e-01
Photon flux (15-150 keV) in 1 sec: 0.906240 ( -0.179727 0.179803 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77641e-08 ( -1.37212e-08 1.41351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.204 sec. to 18.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89762 ( -1.5589 1.42719 )
Epeak [keV] : 294.745 ( )
Norm@50keV : 6.39916E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.607093e-01
Photon flux (15-150 keV) in 1 sec: 0.906296 ( -0.180123 0.179414 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77252e-08 ( -1.4566e-08 1.40638e-08 ) ergs/cm2
Band function
Time interval is from 17.204 sec. to 18.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.82038 ( 2.82038 2.82038 )
beta : -1.91214 ( -0.410167 0.367018 )
Epeak [keV] : 65.3061 ( -65.3061 -65.3061 )
Norm@50keV : 0.853836 ( -0.216213 0.20402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.232549e-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] : 11.4092 (-2.62136 3.44378)
R^2/D10^2 : 0.255674 (-0.160136 0.421907)
(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 6.998e-09 3.042e-09
25- 50 2.072e-08 7.322e-09
50-150 1.566e-08 7.731e-09
15-150 4.338e-08 1.517e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.5772 (-41.34 -85.5772)
Norm : 4.14668 (-1.06592 1.57413)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.080e-08 3.950e-09
25- 50 1.806e-08 6.709e-09
50-150 2.665e-08 1.906e-08
15-150 5.551e-08 2.899e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.99336 (-1.4426 2.66845)
R1^2/D10^2 : 46.4518 (-44.8135 5244.25)
kT2 [keV] : 15.6649 (-4.2971 7.9612)
R2^2/D10^2 : 6.86004E-02 (-0.0543189 0.0826628)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.206e-08 6.555e-09
25- 50 1.568e-08 8.830e-09
50-150 2.457e-08 1.546e-08
15-150 5.232e-08 2.744e-08
Plot creation:
Fri Aug 25 17:13:02 EDT 2023