batgrbproduct analysis for trigger=1187225
batgrbproduct Analysis for Trigger=1187225
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): Sat Aug 26 19:38:09 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1187225/GCN5_download_cron
======================================================================
Trigger: 01187225 Segment: 000
BAT Trigger Time: 714699144 [s; MET]
Trigger Stop: 714699360 [s; MET]
UTC: 2023-08-25T23:31:52.107840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.947481520388 Dec: -16.2178211607624 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 31.44
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 31.44
Flight Position: [ source = BAT ]
RA: 261.947481520388 Dec: -16.2178211607624 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.939760486986 Dec: -16.2133893598014 [deg; J2000]
{ 17h 27m 45.5s , -16d 12' 48.2" }
+/- 0.598010675615263 [arcmin] (estimated 90% radius based on SNR)
+/- 0.196341165275051 [arcmin] (formal 1-sigma fit error)
SNR: 63.4023875995734
Angular difference between Flight and Ground position is 0.518250 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 116.075999975204 +/- 4.4890231152698
Measured from: -68.1039998531342
to: 47.9720001220703 [s; relative to TRIGTIME]
T50: 57.0719999074936 +/- 6.23264822897981
Measured from: -35.0839998722076
to: 21.9880000352859 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -4.10800004005432
to: -3.10800004005432 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71.8240000009537
to: 174.468000054359 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 26.884458 21.227467 5.638664 0.409565
0.166014 0.155622 0.116080 0.092324 [error]
Peak 0.172129 0.143448 0.030497 0.007651
0.011388 0.010415 0.007544 0.005815 [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 1.14e-05 8.95e-06 4.74e-06 3.64e-06 2.67e-05 2.87e-05 erg/cm2
Error 4.11e-07 1.77e-07 1.37e-07 2.26e-07 5.50e-07 5.44e-07 erg/cm2
Peak flux Power-law 2.01e+00 9.98e-01 3.03e-01 1.17e-01 3.38e+00 3.43e+00 ph/cm2/s
Error 2.37e-01 9.58e-02 5.88e-02 4.09e-02 3.05e-01 3.07e-01 ph/cm2/s
Fluence Cutoff-PL 9.99e-06 9.29e-06 4.62e-06 1.51e-06 2.50e-05 2.54e-05 erg/cm2
Error 5.30e-07 2.02e-07 1.54e-07 3.33e-07 7.02e-07 8.25e-07 erg/cm2
Peak flux Cutoff-PL 1.86e+00 1.12e+00 2.58e-01 2.22e-02 3.25e+00 3.25e+00 ph/cm2/s
Error 2.67e-01 1.31e-01 7.88e-02 3.80e-02 3.17e-01 3.20e-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 2.918 0.041 - - 1.00e-02 2.10e-04 95.980 57
CPL 1.984 -0.947 0.8 0.0 3.10e-02 1.36e-03 56.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.718 0.198 - - 1.50e-02 2.20e-03 74.510 57
CPL 1.493 0.850 14.9 12.2 8.75e-02 0.00e+00 68.990 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 246.292 -71.824 174.468
T90 116.076 -68.104 47.972
T50 57.072 -35.084 21.988
Peak 1.000 -4.108 -3.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.9398 -16.2134 0.0030 30.7 -142.6 46.1274 63.4 TRIG_01187225
------------------------------------------
Foreground time interval of the image:
-13.699 35.830 (delta_t = 49.529 [sec])
37.000 102.260 (delta_t = 65.260 [sec])
103.000 174.468 (delta_t = 71.468 [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
-71.824000 -56.795800
-42.000000 35.830000
37.000000 102.260000
103.000000 174.468000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91820 ( -0.0414084 0.0415888 )
Norm@50keV : 1.00458E-02 ( -0.000210132 0.000209567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.98 using 59 PHA bins.
# Reduced chi-squared = 1.684 for 57 degrees of freedom
# Null hypothesis probability = 9.492130e-04
Photon flux (15-150 keV) in 229.6 sec: 2.60482 ( -0.0713196 0.0720277 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67211e-05 ( -5.4885e-07 5.50689e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-71.824000 -56.795800
-42.000000 35.830000
37.000000 102.260000
103.000000 174.468000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98428 ( -0.0894332 -1.98428 )
Epeak [keV] : 0.751808 ( -0.039258 0.041974 )
Norm@50keV : 3.10184E-02 ( -0.00109997 0.00162011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 56 degrees of freedom
# Null hypothesis probability = 4.486035e-01
Photon flux (15-150 keV) in 229.6 sec: 2.39801 ( -0.08631 0.08746 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49552e-05 ( -6.99591e-07 7.04413e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-71.824000 -56.795800
-42.000000 35.830000
37.000000 102.260000
103.000000 174.468000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75065 ( )
beta : -8.24944 ( )
Epeak [keV] : 12.1064 ( )
Norm@50keV : 3.18068E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 130.70 using 59 PHA bins.
# Reduced chi-squared = 2.3764 for 55 degrees of freedom
# Null hypothesis probability = 4.187461e-08
Photon flux (15-150 keV) in 229.6 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] : 8.70090 ( )
R^2/D10^2 : 1.48391 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 513.75 using 59 PHA bins.
# Reduced chi-squared = 9.0131 for 57 degrees of freedom
# Null hypothesis probability = 9.966982e-75
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.930e-06 2.043e-07
25- 50 9.931e-06 1.894e-07
50-150 3.413e-06 1.481e-07
15-150 1.827e-05 3.765e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.4209 (-1.05402 1.10966)
Norm : 18.1998 (-0.940824 0.990832)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.419e-06 2.973e-07
25- 50 9.516e-06 1.975e-07
50-150 5.079e-06 2.078e-07
15-150 2.302e-05 4.512e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.04578 (-0.295833 0.289018)
R1^2/D10^2 : 6.46558 (-1.16888 1.55227)
kT2 [keV] : 17.4808 (-1.40769 1.65342)
R2^2/D10^2 : 3.55428E-02 (-0.0123532 0.0180271)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.792e-06 4.799e-07
25- 50 9.668e-06 3.054e-07
50-150 5.712e-06 4.339e-07
15-150 2.317e-05 8.576e-07
Peak spectrum fit
Power-law model
Time interval is from -4.108 sec. to -3.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.71777 ( -0.190554 0.205873 )
Norm@50keV : 1.49731E-02 ( -0.00221229 0.00219625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.51 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.961953e-02
Photon flux (15-150 keV) in 1 sec: 3.38147 ( -0.304513 0.304824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60288e-07 ( -1.60165e-08 1.62745e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.108 sec. to -3.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49341 ( -1.20945 0.490333 )
Epeak [keV] : 14.8801 ( -13.7631 10.6539 )
Norm@50keV : 8.75076E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 56 degrees of freedom
# Null hypothesis probability = 1.140749e-01
Photon flux (15-150 keV) in 1 sec: 3.25188 ( -0.31706 0.31788 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47584e-07 ( -1.657e-08 1.7277e-08 ) ergs/cm2
Band function
Time interval is from -4.108 sec. to -3.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49456 ( -0.531911 2.74019 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 14.8567 ( -8.10067 10.6601 )
Norm@50keV : 8.73536E-02 ( -0.050585 0.442564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 55 degrees of freedom
# Null hypothesis probability = 9.730352e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48549e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.05133 (-0.653562 0.709924)
R^2/D10^2 : 5.96783 (-2.03314 3.15863)
(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 4.803e-08 7.390e-09
25- 50 6.671e-08 8.680e-09
50-150 1.135e-08 3.784e-09
15-150 1.261e-07 1.395e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.2191 (-4.79649 6.05532)
Norm : 29.1968 (-5.52421 7.15638)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.634e-08 6.840e-09
25- 50 6.088e-08 6.385e-09
50-150 2.923e-08 9.065e-09
15-150 1.464e-07 1.540e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.82931 (-3.29999 1.44353)
R1^2/D10^2 : 21.6899 (-12.9773 19726.9)
kT2 [keV] : 12.2078 (-4.60377 8.69438)
R2^2/D10^2 : 0.317852 (-0.289684 0.546799)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.584e-08 2.950e-08
25- 50 5.964e-08 2.752e-08
50-150 3.013e-08 1.747e-08
15-150 1.456e-07 7.380e-08
Plot creation:
Sat Aug 26 19:40:11 EDT 2023