batgrbproduct analysis for trigger=1185673
batgrbproduct Analysis for Trigger=1185673
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): Thu Aug 17 18:57:13 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1185673/GCN5_download_cron
======================================================================
Trigger: 01185673 Segment: 000
BAT Trigger Time: 713894960.128 [s; MET]
Trigger Stop: 713894961.152 [s; MET]
UTC: 2023-08-16T16:08:48.290780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.37496109811 Dec: 37.828503929981 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.42
Image Trigger?: NO
Rate S/N Ratio: 15.0332963783729 [ if not an image trigger ]
Image S/N Ratio: 7.42
Flight Position: [ source = BAT ]
RA: 328.37496109811 Dec: 37.828503929981 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.453216670191 Dec: 37.8533612559534 [deg; J2000]
{ 21h 53m 48.8s , +37d 51' 12.1" }
+/- 1.24918181851546 [arcmin] (estimated 90% radius based on SNR)
+/- 0.395009032361888 [arcmin] (formal 1-sigma fit error)
SNR: 22.1351123475749
Angular difference between Flight and Ground position is 3.996692 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 20.4799998998642 +/- 4.94120520482814
Measured from: -4.21999990940094
to: 16.2599999904633 [s; relative to TRIGTIME]
T50: 7.91999995708466 +/- 1.86799580565805
Measured from: -0.651999950408936
to: 7.26800000667572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.595999956130981
to: 1.59599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.60399997234344
to: 21.0799999237061 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.392509 0.439120 0.355672 0.119558
0.031132 0.032354 0.028159 0.024469 [error]
Peak 0.038094 0.046242 0.038447 0.012148
0.006307 0.006578 0.005792 0.004872 [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 9.64e-08 1.85e-07 2.74e-07 8.75e-07 7.74e-07 1.43e-06 erg/cm2
Error 1.30e-08 1.46e-08 2.77e-08 1.96e-07 6.67e-08 2.15e-07 erg/cm2
Peak flux Power-law 3.20e-01 3.29e-01 2.39e-01 2.78e-01 9.96e-01 1.17e+00 ph/cm2/s
Error 8.04e-02 5.07e-02 4.70e-02 1.13e-01 1.46e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 9.69e-08 1.85e-07 2.74e-07 8.60e-07 7.72e-07 1.41e-06 erg/cm2
Error 1.30e-08 1.43e-08 2.75e-08 2.33e-07 6.57e-08 2.28e-07 erg/cm2
Peak flux Cutoff-PL 3.21e-01 3.30e-01 2.38e-01 2.74e-01 9.96e-01 1.16e+00 ph/cm2/s
Error 7.98e-02 5.25e-02 4.70e-02 1.73e-01 1.46e-01 2.02e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.431 0.139 - - 3.02e-03 2.30e-04 62.940 57
CPL 1.428 0.226 9999.4 0.0 3.03e-03 2.14e-03 62.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.462 0.266 - - 8.06e-03 1.23e-03 43.970 57
CPL 1.464 0.364 9999.4 0.0 8.07e-03 7.05e-03 43.970 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: 26.432000 sec.
T50 in the 50-300 keV band: 8.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 26.684 -5.604 21.080
T90 20.480 -4.220 16.260
T50 7.920 -0.652 7.268
Peak 1.000 0.596 1.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.4532 +37.8534 0.0087 12.6 142.6 1.2407 22.1 TRIG_01185673
------------------------------------------
Foreground time interval of the image:
-5.604 15.473 (delta_t = 21.077 [sec])
Background time interval of the image:
-239.128 -215.008 (delta_t = 24.120 [sec])
-119.128 -78.938 (delta_t = 40.190 [sec])
-78.128 -5.604 (delta_t = 72.524 [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 -5.604 sec. to 21.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43091 ( -0.138714 0.138808 )
Norm@50keV : 3.02053E-03 ( -0.000230677 0.000229691 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.94 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.741297e-01
Photon flux (15-150 keV) in 26.68 sec: 0.370509 ( -0.0281002 0.0281578 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.73939e-07 ( -6.63492e-08 6.69617e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.604 sec. to 21.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42840 ( -0.31311 0.139383 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.03061E-03 ( -0.00303062 0.00125873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.96 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 56 degrees of freedom
# Null hypothesis probability = 2.436020e-01
Photon flux (15-150 keV) in 26.68 sec: 0.370785 ( -0.028412 0.027778 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72437e-07 ( -6.4723e-08 6.66733e-08 ) ergs/cm2
Band function
Time interval is from -5.604 sec. to 21.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87369 ( -4.87369 -4.87369 )
beta : -1.46320 ( -0.151584 0.146852 )
Epeak [keV] : 21.5687 ( -21.5687 4.45731 )
Norm@50keV : 591.924 ( -43.903 1.26625e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.328096e-01
Photon flux (15-150 keV) in 26.68 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9882 ( )
R^2/D10^2 : 4.10531E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.20 using 59 PHA bins.
# Reduced chi-squared = 2.0913 for 57 degrees of freedom
# Null hypothesis probability = 2.721706e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.152e-08 7.777e-09
25- 50 2.046e-07 1.990e-08
50-150 3.126e-07 5.119e-08
15-150 5.687e-07 5.229e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.5426 -200)
Norm : 1.51711 (-0.113104 0.113104)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.008e-07 9.178e-09
25- 50 1.939e-07 2.018e-08
50-150 4.252e-07 1.430e-07
15-150 7.199e-07 1.798e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.85552 (-1.68107 1.88598)
R1^2/D10^2 : 0.288696 (-0.142639 0.248157)
kT2 [keV] : 40.0358 (-12.902 49.8272)
R2^2/D10^2 : 1.33823E-03 (-0.00111839 0.00319312)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.214e-08 2.232e-08
25- 50 1.941e-07 4.006e-08
50-150 5.173e-07 2.503e-07
15-150 8.035e-07 2.761e-07
Peak spectrum fit
Power-law model
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46245 ( -0.262996 0.268486 )
Norm@50keV : 8.06012E-03 ( -0.00124111 0.00122278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.7713 for 57 degrees of freedom
# Null hypothesis probability = 8.970208e-01
Photon flux (15-150 keV) in 1 sec: 0.996402 ( -0.146306 0.146423 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.69558e-08 ( -1.31636e-08 1.33875e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46395 ( -0.461749 0.26605 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 8.06669E-03 ( -0.0012444 0.0128648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.7852 for 56 degrees of freedom
# Null hypothesis probability = 8.781455e-01
Photon flux (15-150 keV) in 1 sec: 0.996434 ( -0.14656 0.146026 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.68466e-08 ( -1.34037e-08 1.33624e-08 ) ergs/cm2
Band function
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10441 ( 1.09846 1.09846 )
beta : -1.46389 ( 1.46405 0.264565 )
Epeak [keV] : 46.8627 ( -45.4586 -45.4586 )
Norm@50keV : 1.64126E-02 ( -0.0104251 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7993 for 55 degrees of freedom
# Null hypothesis probability = 8.571809e-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] : 15.1627 (-3.01841 3.84803)
R^2/D10^2 : 0.107595 (-0.0578535 0.123878)
(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 5.170e-09 1.536e-09
25- 50 2.075e-08 5.545e-09
50-150 3.261e-08 1.019e-08
15-150 5.853e-08 1.319e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.0733 -199.363)
Norm : 4.07037 (-0.594236 0.594236)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.014e-08 5.765e-09
25- 50 1.950e-08 1.079e-08
50-150 4.276e-08 2.404e-08
15-150 7.239e-08 4.032e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.02751 (-2.19858 3.33723)
R1^2/D10^2 : 1.85741 (-1.43115 5.1667)
kT2 [keV] : 27.9045 (-9.04088 37.4838)
R2^2/D10^2 : 1.12934E-02 (-0.0102706 0.0326375)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.046e-08 5.775e-09
25- 50 1.768e-08 9.417e-09
50-150 4.929e-08 2.912e-08
15-150 7.743e-08 4.152e-08
Plot creation:
Thu Aug 17 19:01:16 EDT 2023