batgrbproduct analysis for trigger=1186280
batgrbproduct Analysis for Trigger=1186280
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 20:37:08 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186280/GCN5_download_cron
======================================================================
Trigger: 01186280 Segment: 000
BAT Trigger Time: 714248936 [s; MET]
Trigger Stop: 714249000 [s; MET]
UTC: 2023-08-20T18:28:24.138600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.041864691731 Dec: -15.8388660750781 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.2
Flight Position: [ source = BAT ]
RA: 245.041864691731 Dec: -15.8388660750781 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.024448292495 Dec: -15.7878153763309 [deg; J2000]
{ 16h 20m 05.9s , -15d 47' 16.1" }
+/- 1.36591780278165 [arcmin] (estimated 90% radius based on SNR)
+/- 0.570353730101818 [arcmin] (formal 1-sigma fit error)
SNR: 19.4829499573757
Angular difference between Flight and Ground position is 3.223837 arcmin
Partial Coding Fraction: 0.84375 [ 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 1.986758 0.246019 -0.019739 0.046888
0.062085 0.055339 0.044904 0.037912 [error]
Peak 1.986758 0.246019 -0.019739 0.046888
0.062085 0.055339 0.044904 0.037912 [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 6.72e-07 1.05e-07 7.54e-09 5.79e-10 7.84e-07 7.85e-07 erg/cm2
Error 7.33e-08 2.57e-08 4.51e-09 6.14e-10 7.78e-08 7.78e-08 erg/cm2
Peak flux Power-law 3.74e-01 3.41e-02 1.23e-03 4.57e-05 4.10e-01 4.10e-01 ph/cm2/s
Error 4.23e-02 7.93e-03 7.15e-04 4.68e-05 4.24e-02 4.24e-02 ph/cm2/s
Fluence Cutoff-PL 6.83e-07 7.78e-08 4.95e-10 4.47e-14 7.61e-07 7.61e-07 erg/cm2
Error 7.77e-08 4.35e-08 5.91e-09 6.04e-10 8.21e-08 8.19e-08 erg/cm2
Peak flux Cutoff-PL 3.79e-01 2.65e-02 9.08e-05 4.46e-09 4.05e-01 4.05e-01 ph/cm2/s
Error 4.44e-02 1.33e-02 9.50e-04 4.65e-05 4.39e-02 4.39e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.44e-01 5.99e-03 2.41e-05 9.69e-08 3.50e-01 3.50e-01 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 5.796 0.499 - - 1.22e-04 5.90e-05 61.370 57
CPL 1.000 0.000 50.0 0.0 2.57e-03 0.00e+00 265.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.796 0.499 - - 1.22e-04 5.90e-05 61.370 57
CPL 1.000 0.000 50.0 0.0 2.57e-03 0.00e+00 265.800 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
245.0244 -15.7878 0.0099 29.1 -19.4 2.5196 19.5 TRIG_01186280
------------------------------------------
Foreground time interval of the image:
0.000 26.080 (delta_t = 26.080 [sec])
27.000 64.000 (delta_t = 37.000 [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 26.080000
27.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.79636 ( -0.48738 0.509717 )
Norm@50keV : 1.22032E-04 ( -4.8103e-05 6.98577e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.221211e-01
Photon flux (15-150 keV) in 63.08 sec: 0.409679 ( -0.0423946 0.0424858 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84457e-07 ( -7.77802e-08 7.77865e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 26.080000
27.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.57336E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 265.80 using 59 PHA bins.
# Reduced chi-squared = 4.7464 for 56 degrees of freedom
# Null hypothesis probability = 4.766817e-29
Photon flux (15-150 keV) in 63.08 sec: 0.405250 ( -0.044226 0.043633 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61161e-07 ( -8.17517e-08 8.24456e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 26.080000
27.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59059 ( )
beta : -6.92656 ( )
Epeak [keV] : 22.4397 ( )
Norm@50keV : 2.50375E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.00 using 59 PHA bins.
# Reduced chi-squared = 4.1272 for 55 degrees of freedom
# Null hypothesis probability = 9.119780e-23
Photon flux (15-150 keV) in 63.08 sec: 0.350355 ( ) 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] : 2.57442 (-0.219844 0.252285)
R^2/D10^2 : 161.382 (-82.205 166.976)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.266394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.892e-07 1.500e-07
25- 50 5.696e-08 1.791e-08
50-150 2.389e-11 1.925e-11
15-150 7.462e-07 1.732e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.63384 (-0.597841 0.741371)
Norm : 124.181 (-55.7976 103.983)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.856e-07 1.333e-07
25- 50 7.257e-08 2.366e-08
50-150 2.527e-10 2.001e-10
15-150 7.585e-07 1.591e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.08946 (-6.77769 14.1072)
R1^2/D10^2 : 2.12040E-02 (-0.0230522 71.7546)
kT2 [keV] : 2.43114 (-0.513319 0.291918)
R2^2/D10^2 : 237.098 (-141.421 878.293)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.888e-07 8.576e-02
25- 50 5.799e-08 7.828e-01
50-150 2.850e-11 9.563e+00
15-150 7.468e-07 1.396e+01
Peak spectrum fit
Power-law model
Time interval is from 27.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.79636 ( -0.48738 0.509717 )
Norm@50keV : 1.22032E-04 ( -4.8103e-05 6.98577e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.221211e-01
Photon flux (15-150 keV) in 63.08 sec: 0.409679 ( -0.0423946 0.0424858 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84457e-07 ( -7.77802e-08 7.77865e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.57336E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 265.80 using 59 PHA bins.
# Reduced chi-squared = 4.7464 for 56 degrees of freedom
# Null hypothesis probability = 4.766817e-29
Photon flux (15-150 keV) in 63.08 sec: 0.405250 ( -0.044226 0.043633 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61161e-07 ( -8.17517e-08 8.24456e-08 ) ergs/cm2
Band function
Time interval is from 27.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59059 ( )
beta : -6.92656 ( )
Epeak [keV] : 22.4397 ( )
Norm@50keV : 2.50375E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.00 using 59 PHA bins.
# Reduced chi-squared = 4.1272 for 55 degrees of freedom
# Null hypothesis probability = 9.119780e-23
Photon flux (15-150 keV) in 63.08 sec: 0.350355 ( ) 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] : 2.57442 (-0.219844 0.252285)
R^2/D10^2 : 161.382 (-82.205 166.976)
(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 6.892e-07 1.844e-07
25- 50 5.696e-08 1.789e-08
50-150 2.389e-11 1.976e-11
15-150 7.462e-07 2.108e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.63384 (-0.597841 0.741371)
Norm : 124.181 (-55.7976 103.983)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.856e-07 1.371e-07
25- 50 7.257e-08 1.982e-08
50-150 2.527e-10 1.982e-10
15-150 7.585e-07 1.785e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.08946 (-5.67661 14.1082)
R1^2/D10^2 : 2.12040E-02 (-0.0230522 71.7546)
kT2 [keV] : 2.43114 (-0.513392 0.291917)
R2^2/D10^2 : 237.098 (-141.421 878.38)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.888e-07 9.292e-02
25- 50 5.799e-08 8.591e-01
50-150 2.850e-11 9.402e+00
15-150 7.468e-07 1.365e+01
Plot creation:
Mon Aug 21 20:39:30 EDT 2023