batgrbproduct analysis for trigger=1186982
batgrbproduct Analysis for Trigger=1186982
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 17:07:41 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186982/GCN5_download_cron
======================================================================
Trigger: 01186982 Segment: 000
BAT Trigger Time: 714596104 [s; MET]
Trigger Stop: 714596296 [s; MET]
UTC: 2023-08-24T18:54:32.114880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.937476571155 Dec: -16.212471239936 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.37
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 24.37
Flight Position: [ source = BAT ]
RA: 261.937476571155 Dec: -16.212471239936 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.933347612837 Dec: -16.2085695278386 [deg; J2000]
{ 17h 27m 44.0s , -16d 12' 30.9" }
+/- 0.78073399441328 [arcmin] (estimated 90% radius based on SNR)
+/- 0.280594313767649 [arcmin] (formal 1-sigma fit error)
SNR: 43.3196954515214
Angular difference between Flight and Ground position is 0.333759 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 182.291999936104 +/- 32.2929996538866
Measured from: -37.607999920845
to: 144.684000015259 [s; relative to TRIGTIME]
T50: 102.395999908447 +/- 4.14223187821671
Measured from: -12.3519998788834
to: 90.0440000295639 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -58.5520000457764
to: -57.5520000457764 [s; relative to TRIGTIME]
Total Fluence
Measured from: -60.3719999790192
to: 177.284000039101 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.914663 8.245855 4.239665 0.668666
0.115097 0.112674 0.093198 0.074914 [error]
Peak 0.072233 0.037448 0.031700 0.006643
0.015008 0.014441 0.011837 0.010696 [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 2.56e-06 3.38e-06 3.29e-06 5.72e-06 1.11e-05 1.49e-05 erg/cm2
Error 1.06e-07 8.07e-08 1.01e-07 3.85e-07 2.49e-07 4.57e-07 erg/cm2
Peak flux Power-law 5.56e-01 3.76e-01 1.67e-01 1.02e-01 1.15e+00 1.20e+00 ph/cm2/s
Error 2.20e-01 1.16e-01 9.12e-02 1.21e-01 3.42e-01 3.62e-01 ph/cm2/s
Fluence Cutoff-PL 2.20e-06 3.55e-06 3.36e-06 2.32e-06 1.04e-05 1.14e-05 erg/cm2
Error 1.35e-07 9.32e-08 1.11e-07 5.03e-07 3.00e-07 5.98e-07 erg/cm2
Peak flux Cutoff-PL 5.31e-01 4.03e-01 1.66e-01 5.01e-02 1.13e+00 1.15e+00 ph/cm2/s
Error 2.40e-01 1.48e-01 1.35e-01 1.16e-01 3.44e-01 3.74e-01 ph/cm2/s
Fluence Band 2.13e-06 3.56e-06 3.29e-06 3.58e-06 1.05e-05 1.26e-05 erg/cm2
Error 1.49e-07 1.05e-07 1.34e-07 -------- 2.94e-07 -------- erg/cm2
Peak flux Band 5.39e-01 3.94e-01 1.69e-01 6.91e-02 -------- 1.18e+00 ph/cm2/s
Error -------- -------- 1.01e-01 1.15e-01 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.041 0.043 - - 5.58e-03 1.29e-04 82.120 57
CPL 1.296 0.207 46.6 3.5 1.30e-02 3.07e-03 38.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.175 0.614 - - 7.03e-03 2.97e-03 57.480 57
CPL 1.629 1.736 28.2 0.0 1.47e-02 0.00e+00 57.260 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 237.656 -60.372 177.284
T90 182.292 -37.608 144.684
T50 102.396 -12.352 90.044
Peak 1.000 -58.552 -57.552
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.9333 -16.2086 0.0045 26.8 -162.9 17.7837 43.3 TRIG_01186982
------------------------------------------
Foreground time interval of the image:
-12.899 18.000 (delta_t = 30.899 [sec])
19.000 19.360 (delta_t = 0.360 [sec])
24.000 177.284 (delta_t = 153.284 [sec])
Background time interval of the image:
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
-60.372000 -56.510000
-40.000000 18.000000
19.000000 19.360000
24.000000 177.284000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04066 ( -0.0433835 0.0435949 )
Norm@50keV : 5.57787E-03 ( -0.000128681 0.000128489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.12 using 59 PHA bins.
# Reduced chi-squared = 1.441 for 57 degrees of freedom
# Null hypothesis probability = 1.635474e-02
Photon flux (15-150 keV) in 215.5 sec: 0.852716 ( -0.0223993 0.0225111 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11128e-05 ( -2.48885e-07 2.48952e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-60.372000 -56.510000
-40.000000 18.000000
19.000000 19.360000
24.000000 177.284000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29636 ( -0.212078 0.202564 )
Epeak [keV] : 46.6361 ( -3.61888 3.41415 )
Norm@50keV : 1.30228E-02 ( -0.00263707 0.00350272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.09 using 59 PHA bins.
# Reduced chi-squared = 0.6802 for 56 degrees of freedom
# Null hypothesis probability = 9.679125e-01
Photon flux (15-150 keV) in 215.5 sec: 0.798133 ( -0.025728 0.025929 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04466e-05 ( -2.99049e-07 3.00213e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-60.372000 -56.510000
-40.000000 18.000000
19.000000 19.360000
24.000000 177.284000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12701 ( -0.286196 0.944539 )
beta : -2.56054 ( 2.56046 0.274456 )
Epeak [keV] : 44.9624 ( -4.15059 3.79246 )
Norm@50keV : 1.62770E-02 ( -0.00476813 0.0498552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.39 using 59 PHA bins.
# Reduced chi-squared = 0.6435 for 55 degrees of freedom
# Null hypothesis probability = 9.816032e-01
Photon flux (15-150 keV) in 215.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04536e-05 ( -1.04521e-05 -2.94157e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2651 ( )
R^2/D10^2 : 0.167341 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 333.24 using 59 PHA bins.
# Reduced chi-squared = 5.8464 for 57 degrees of freedom
# Null hypothesis probability = 1.132399e-40
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.149e-06 4.967e-08
25- 50 3.709e-06 1.013e-07
50-150 3.404e-06 1.465e-07
15-150 8.262e-06 1.918e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.3912 (-4.86801 5.43149)
Norm : 3.96165 (-0.164316 0.172319)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.201e-06 8.146e-08
25- 50 3.545e-06 9.159e-08
50-150 4.714e-06 2.144e-07
15-150 1.046e-05 2.370e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.77068 (-0.596432 0.627754)
R1^2/D10^2 : 1.09055 (-0.284503 0.426393)
kT2 [keV] : 19.9249 (-1.6333 2.11891)
R2^2/D10^2 : 1.78378E-02 (-0.00640759 0.00833332)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.964e-06 1.548e-07
25- 50 3.606e-06 1.638e-07
50-150 4.620e-06 3.620e-07
15-150 1.019e-05 4.622e-07
Peak spectrum fit
Power-law model
Time interval is from -58.552 sec. to -57.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17524 ( -0.540021 0.687979 )
Norm@50keV : 7.03095E-03 ( -0.00306933 0.00286775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.48 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.572649e-01
Photon flux (15-150 keV) in 1 sec: 1.14906 ( -0.341541 0.341541 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.58845e-08 ( -2.36175e-08 2.50897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -58.552 sec. to -57.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62946 ( -3.00977 0.461759 )
Epeak [keV] : 28.2415 ( )
Norm@50keV : 1.46606E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.283155e-01
Photon flux (15-150 keV) in 1 sec: 1.13469 ( -0.343294 0.3442 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33697e-08 ( -2.3825e-08 2.65672e-08 ) ergs/cm2
Band function
Time interval is from -58.552 sec. to -57.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63538 ( -0.522747 1.49339 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 28.2184 ( -23.6304 -28.2175 )
Norm@50keV : 1.45134E-02 ( -0.00891095 1.20538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.914382e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2092e-15 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.72170 (-3.23313 4.72368)
R^2/D10^2 : 0.892587 (-0.882857 4.67797)
(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 1.299e-08 7.955e-09
25- 50 2.628e-08 1.634e-08
50-150 9.098e-09 6.905e-09
15-150 4.837e-08 3.064e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.3315 (-29.2002 105.673)
Norm : 6.40044 (-2.59823 5.33134)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.581e-08 8.387e-09
25- 50 2.307e-08 1.252e-08
50-150 2.337e-08 1.800e-08
15-150 6.224e-08 4.006e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08242 (-5.13324 4.05346)
R1^2/D10^2 : 5.58188 (-4.84316 -5.46738)
kT2 [keV] : 18.0170 (-18.1504 63.7411)
R2^2/D10^2 : 3.66155E-02 (-0.0357622 0.838852)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.686e-08 1.005e-08
25- 50 2.086e-08 1.093e-08
50-150 2.638e-08 1.875e-08
15-150 6.411e-08 3.493e-08
Plot creation:
Fri Aug 25 17:09:36 EDT 2023