batgrbproduct analysis for trigger=1186908
batgrbproduct Analysis for Trigger=1186908
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 04:04:56 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186908/GCN5_download_cron
======================================================================
Trigger: 01186908 Segment: 000
BAT Trigger Time: 714536696 [s; MET]
Trigger Stop: 714536760 [s; MET]
UTC: 2023-08-24T02:24:24.118940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.5327921903189 Dec: 21.6092510084638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.98
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.98
Flight Position: [ source = BAT ]
RA: 83.5327921903189 Dec: 21.6092510084638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.5338410027092 Dec: 21.593772259425 [deg; J2000]
{ 05h 34m 08.1s , +21d 35' 37.6" }
+/- 1.40531256813261 [arcmin] (estimated 90% radius based on SNR)
+/- 0.782144445325307 [arcmin] (formal 1-sigma fit error)
SNR: 18.7074327997394
Angular difference between Flight and Ground position is 0.930566 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.893237 0.840298 0.415527 0.122751
0.046665 0.047385 0.039647 0.033557 [error]
Peak 0.893237 0.840298 0.415527 0.122751
0.046665 0.047385 0.039647 0.033557 [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 2.46e-07 3.36e-07 3.38e-07 6.17e-07 1.12e-06 1.54e-06 erg/cm2
Error 2.42e-08 2.18e-08 3.80e-08 1.40e-07 8.58e-08 1.78e-07 erg/cm2
Peak flux Power-law 1.29e-01 9.70e-02 4.88e-02 3.51e-02 2.91e-01 3.09e-01 ph/cm2/s
Error 1.29e-02 6.28e-03 5.28e-03 7.41e-03 1.91e-02 2.01e-02 ph/cm2/s
Fluence Cutoff-PL 2.39e-07 3.48e-07 3.34e-07 3.44e-07 1.08e-06 1.26e-06 erg/cm2
Error 2.73e-08 2.90e-08 4.13e-08 2.96e-07 1.05e-07 2.20e-07 erg/cm2
Peak flux Cutoff-PL 1.24e-01 1.00e-01 4.85e-02 2.22e-02 2.86e-01 2.95e-01 ph/cm2/s
Error 1.48e-02 8.10e-03 5.62e-03 1.32e-02 2.04e-02 2.71e-02 ph/cm2/s
Fluence Band 2.34e-07 3.52e-07 3.24e-07 4.93e-07 1.08e-06 1.40e-06 erg/cm2
Error 2.99e-08 -------- 4.39e-08 -------- -------- -------- 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 1.991 0.128 - - 1.95e-03 1.56e-04 62.870 57
CPL 1.672 0.528 43.6 0.0 2.95e-03 0.00e+00 61.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.991 0.128 - - 1.95e-03 1.56e-04 62.870 57
CPL 1.672 0.528 43.6 0.0 2.95e-03 0.00e+00 61.710 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.5338 +21.5938 0.0102 11.6 131.8 2.2443 18.7 TRIG_01186908
------------------------------------------
Foreground time interval of the image:
0.000 12.420 (delta_t = 12.420 [sec])
14.000 64.000 (delta_t = 50.000 [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
0.000000 12.420000
14.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99107 ( -0.126588 0.130359 )
Norm@50keV : 1.94577E-03 ( -0.000157287 0.000154956 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.763941e-01
Photon flux (15-150 keV) in 62.42 sec: 0.290674 ( -0.0190758 0.0190913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11953e-06 ( -8.52626e-08 8.63936e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.420000
14.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67243 ( -0.569626 0.486519 )
Epeak [keV] : 43.5615 ( )
Norm@50keV : 2.95245E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.71 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.792888e-01
Photon flux (15-150 keV) in 62.42 sec: 0.285934 ( -0.020447 0.020379 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07983e-06 ( -1.03892e-07 1.05796e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.420000
14.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.74262 ( -0.284475 -0.284475 )
beta : -2.07029 ( 2.07394 0.167131 )
Epeak [keV] : 23.1071 ( -25.0041 75.6475 )
Norm@50keV : 1.55651 ( -1.5586 296.292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.91 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.718100e-01
Photon flux (15-150 keV) in 62.42 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08483e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0891 (-0.801242 0.87573)
R^2/D10^2 : 0.126549 (-0.0347799 0.0478931)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.26 using 59 PHA bins.
# Reduced chi-squared = 1.9168 for 57 degrees of freedom
# Null hypothesis probability = 3.849622e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.642e-07 1.851e-08
25- 50 4.135e-07 3.246e-08
50-150 2.214e-07 4.095e-08
15-150 7.992e-07 5.836e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 68.4525 (-13.3457 18.8206)
Norm : 1.42508 (-0.15494 0.18002)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.277e-07 2.026e-08
25- 50 3.600e-07 2.316e-08
50-150 4.547e-07 8.395e-08
15-150 1.042e-06 9.738e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.68543 (-1.24403 1.41877)
R1^2/D10^2 : 0.808913 (-0.42855 1.24486)
kT2 [keV] : 19.1331 (-4.23979 8.7237)
R2^2/D10^2 : 7.78298E-03 (-0.00587117 0.00818655)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.347e-07 5.743e-08
25- 50 3.454e-07 7.537e-08
50-150 4.670e-07 1.884e-07
15-150 1.047e-06 3.097e-07
Peak spectrum fit
Power-law model
Time interval is from 14.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99107 ( -0.126588 0.130359 )
Norm@50keV : 1.94577E-03 ( -0.000157287 0.000154956 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.763941e-01
Photon flux (15-150 keV) in 62.42 sec: 0.290674 ( -0.0190758 0.0190913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11953e-06 ( -8.52626e-08 8.63936e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67243 ( -0.569626 0.486519 )
Epeak [keV] : 43.5615 ( )
Norm@50keV : 2.95245E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.71 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.792888e-01
Photon flux (15-150 keV) in 62.42 sec: 0.285934 ( -0.020447 0.020379 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07983e-06 ( -1.03892e-07 1.05796e-07 ) ergs/cm2
Band function
Time interval is from 14.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.74262 ( -0.284475 -0.284475 )
beta : -2.07029 ( 2.07394 0.167131 )
Epeak [keV] : 23.1071 ( -25.0041 75.6475 )
Norm@50keV : 1.55651 ( -1.5586 296.283 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.91 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.718100e-01
Photon flux (15-150 keV) in 62.42 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08483e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0891 (-0.801242 0.87573)
R^2/D10^2 : 0.126549 (-0.0347799 0.0478931)
(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 1.642e-07 1.919e-08
25- 50 4.135e-07 3.386e-08
50-150 2.214e-07 3.758e-08
15-150 7.992e-07 5.930e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 68.4525 (-13.3457 18.8206)
Norm : 1.42508 (-0.15494 0.18002)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.277e-07 2.041e-08
25- 50 3.600e-07 2.400e-08
50-150 4.547e-07 7.522e-08
15-150 1.042e-06 9.145e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.68543 (-1.24403 1.41877)
R1^2/D10^2 : 0.808913 (-0.42855 1.24486)
kT2 [keV] : 19.1331 (-4.23979 8.7237)
R2^2/D10^2 : 7.78298E-03 (-0.00587117 0.00818655)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.347e-07 6.816e-08
25- 50 3.454e-07 9.070e-08
50-150 4.670e-07 2.062e-07
15-150 1.047e-06 2.681e-07
Plot creation:
Fri Aug 25 04:08:04 EDT 2023