batgrbproduct analysis for trigger=1187463
batgrbproduct Analysis for Trigger=1187463
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): Sun Aug 27 19:21:14 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1187463/GCN5_download_cron
======================================================================
Trigger: 01187463 Segment: 000
BAT Trigger Time: 714771198.976 [s; MET]
Trigger Stop: 714771200 [s; MET]
UTC: 2023-08-26T19:32:47.078920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.0117437221934 Dec: 66.124903377032 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.04
Image Trigger?: NO
Rate S/N Ratio: 45.902069670114 [ if not an image trigger ]
Image S/N Ratio: 15.04
Flight Position: [ source = BAT ]
RA: 83.0117437221934 Dec: 66.124903377032 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.0478200501286 Dec: 66.1288728373087 [deg; J2000]
{ 05h 32m 11.5s , +66d 07' 43.9" }
+/- 0.654904351193856 [arcmin] (estimated 90% radius based on SNR)
+/- 0.190704340658091 [arcmin] (formal 1-sigma fit error)
SNR: 55.6828447269114
Angular difference between Flight and Ground position is 0.907831 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 41.067999958992 +/- 2.36497777752587
Measured from: -2.34799981117249
to: 38.7200001478195 [s; relative to TRIGTIME]
T50: 12.0920000076294 +/- 0.855083616881669
Measured from: 2.13600015640259
to: 14.228000164032 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.43599998950958
to: 3.43599998950958 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.26399993896484
to: 56.7880001068115 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.701345 2.396763 1.681008 0.390652
0.051144 0.054062 0.046613 0.036985 [error]
Peak 0.080110 0.158365 0.118407 0.028977
0.007603 0.009006 0.008388 0.005881 [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 5.25e-07 9.39e-07 1.29e-06 3.65e-06 3.71e-06 6.40e-06 erg/cm2
Error 2.91e-08 3.01e-08 4.74e-08 3.03e-07 1.14e-07 3.32e-07 erg/cm2
Peak flux Power-law 8.06e-01 9.53e-01 8.13e-01 1.18e+00 2.99e+00 3.75e+00 ph/cm2/s
Error 9.38e-02 7.02e-02 6.51e-02 1.90e-01 2.02e-01 2.71e-01 ph/cm2/s
Fluence Cutoff-PL 4.88e-07 9.62e-07 1.32e-06 2.28e-06 3.62e-06 5.05e-06 erg/cm2
Error 3.66e-08 3.39e-08 5.21e-08 6.57e-07 1.30e-07 6.64e-07 erg/cm2
Peak flux Cutoff-PL 6.81e-01 1.05e+00 8.79e-01 4.33e-01 2.90e+00 3.05e+00 ph/cm2/s
Error 1.11e-01 9.03e-02 7.74e-02 2.15e-01 2.09e-01 2.89e-01 ph/cm2/s
Fluence Band 4.64e-07 9.79e-07 1.28e-06 3.24e-06 3.63e-06 5.97e-06 erg/cm2
Error 4.52e-08 -------- 6.31e-08 -------- 1.28e-07 -------- 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 1.546 0.054 - - 6.46e-03 1.87e-04 52.290 57
CPL 1.203 0.222 122.3 70.2 9.40e-03 2.27e-03 44.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.230 0.108 - - 2.54e-02 1.71e-03 57.040 57
CPL 0.239 0.549 88.7 29.9 8.08e-02 5.69e-02 44.730 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: 39.616000 sec.
T50 in the 50-300 keV band: 9.472000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 61.052 -4.264 56.788
T90 41.068 -2.348 38.720
T50 12.092 2.136 14.228
Peak 1.000 2.436 3.436
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.0478 +66.1289 0.0034 15.7 46.2 4.3880 55.7 TRIG_01187463
------------------------------------------
Foreground time interval of the image:
-4.264 12.125 (delta_t = 16.389 [sec])
Background time interval of the image:
-60.976 -4.264 (delta_t = 56.712 [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 -4.264 sec. to 56.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54597 ( -0.0541106 0.0541819 )
Norm@50keV : 6.45588E-03 ( -0.000186723 0.000186654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.29 using 59 PHA bins.
# Reduced chi-squared = 0.9174 for 57 degrees of freedom
# Null hypothesis probability = 6.519369e-01
Photon flux (15-150 keV) in 61.05 sec: 0.816325 ( -0.025427 0.0254924 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71255e-06 ( -1.1433e-07 1.14577e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.264 sec. to 56.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20255 ( -0.228146 0.216828 )
Epeak [keV] : 122.270 ( -28.9344 111.56 )
Norm@50keV : 9.40280E-03 ( -0.00193968 0.00259626 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.78 using 59 PHA bins.
# Reduced chi-squared = 0.7997 for 56 degrees of freedom
# Null hypothesis probability = 8.591094e-01
Photon flux (15-150 keV) in 61.05 sec: 0.796774 ( -0.027929 0.028009 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61797e-06 ( -1.29939e-07 1.29377e-07 ) ergs/cm2
Band function
Time interval is from -4.264 sec. to 56.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.109360 ( -1.76326 4.76561 )
beta : -1.63259 ( 1.63239 0.0820861 )
Epeak [keV] : 40.8370 ( -13.928 104.609 )
Norm@50keV : 7.49516E-02 ( -0.0772602 193.889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.68 using 59 PHA bins.
# Reduced chi-squared = 0.7942 for 55 degrees of freedom
# Null hypothesis probability = 8.640764e-01
Photon flux (15-150 keV) in 61.05 sec: 0.790036 ( 6.20996 -0.029522 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62779e-06 ( -3.62736e-06 -1.25983e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6333 ( )
R^2/D10^2 : 7.67555E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 265.66 using 59 PHA bins.
# Reduced chi-squared = 4.6607 for 57 degrees of freedom
# Null hypothesis probability = 1.106952e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.380e-07 1.438e-08
25- 50 9.814e-07 3.785e-08
50-150 1.661e-06 8.639e-08
15-150 2.881e-06 9.310e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.3836 -200)
Norm : 3.31322 (-0.0950581 0.0950581)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.039e-07 1.691e-08
25- 50 9.692e-07 3.175e-08
50-150 2.126e-06 6.807e-08
15-150 3.599e-06 1.117e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.44944 (-0.805739 0.874817)
R1^2/D10^2 : 0.659458 (-0.199001 0.314518)
kT2 [keV] : 26.5495 (-2.71404 3.71984)
R2^2/D10^2 : 9.33837E-03 (-0.00355883 0.0046893)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.487e-07 4.557e-08
25- 50 9.819e-07 6.380e-08
50-150 2.162e-06 1.966e-07
15-150 3.593e-06 2.692e-07
Peak spectrum fit
Power-law model
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22959 ( -0.108294 0.108029 )
Norm@50keV : 2.53756E-02 ( -0.00170944 0.0017082 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.736874e-01
Photon flux (15-150 keV) in 1 sec: 2.99158 ( -0.201924 0.201997 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55348e-07 ( -1.944e-08 1.95584e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.239481 ( -0.588243 0.509847 )
Epeak [keV] : 88.7489 ( -17.0254 42.8192 )
Norm@50keV : 8.07823E-02 ( -0.0357334 0.0781263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.73 using 59 PHA bins.
# Reduced chi-squared = 0.7987 for 56 degrees of freedom
# Null hypothesis probability = 8.603719e-01
Photon flux (15-150 keV) in 1 sec: 2.89749 ( -0.2093 0.20833 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36668e-07 ( -2.2184e-08 2.2174e-08 ) ergs/cm2
Band function
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.01119 ( -1.99821 -1.71969 )
beta : -1.73338 ( -0.593555 0.267182 )
Epeak [keV] : 54.9165 ( -9.59801 37.9414 )
Norm@50keV : 0.470993 ( -0.456219 140.572 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.83 using 59 PHA bins.
# Reduced chi-squared = 0.7242 for 55 degrees of freedom
# Null hypothesis probability = 9.383089e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40387e-07 ( -2.4038e-07 -2.1011e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2476 (-1.25048 1.39885)
R^2/D10^2 : 0.282036 (-0.068794 0.0878849)
(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 1.534e-08 1.925e-09
25- 50 6.540e-08 5.340e-09
50-150 1.214e-07 1.660e-08
15-150 2.021e-07 1.705e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-15.4391 -200)
Norm : 12.2152 (-0.82812 0.82812)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.041e-08 2.535e-09
25- 50 5.850e-08 5.645e-09
50-150 1.283e-07 4.452e-08
15-150 2.172e-07 3.650e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.8498 (-2.42614 2.09542)
R1^2/D10^2 : 0.618892 (-0.211528 0.336955)
kT2 [keV] : 50.0885 (-25.066 -52.8337)
R2^2/D10^2 : 4.56109E-03 (-0.00361007 0.0274568)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.961e-08 4.055e-09
25- 50 6.595e-08 1.676e-08
50-150 1.581e-07 6.992e-08
15-150 2.436e-07 8.622e-08
Plot creation:
Sun Aug 27 19:23:09 EDT 2023