batgrbproduct analysis for trigger=1186296
batgrbproduct Analysis for Trigger=1186296
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 20:24:33 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186296/GCN5_download_cron
======================================================================
Trigger: 01186296 Segment: 000
BAT Trigger Time: 714253448 [s; MET]
Trigger Stop: 714253512 [s; MET]
UTC: 2023-08-20T19:43:36.138280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.305852343659 Dec: -17.4342370704185 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.48
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.48
Flight Position: [ source = BAT ]
RA: 245.305852343659 Dec: -17.4342370704185 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.34261409949 Dec: -17.3511736800558 [deg; J2000]
{ 16h 21m 22.2s , -17d 21' 04.2" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.54835045459453 [arcmin] (formal 1-sigma fit error)
SNR: -6.48846746218191
Angular difference between Flight and Ground position is 5.410057 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 80 +/- 97.3242004847715
Measured from: 41.0000001192093
to: 121.000000119209 [s; relative to TRIGTIME]
T50: 48 +/- 22.6274169979695
Measured from: 57.0000001192093
to: 105.000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 96.5
to: 97.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -39
to: 121 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.131565 0.922246 0.033183 -0.025731
0.092130 0.076123 0.063022 0.054332 [error]
Peak 0.079787 0.010331 -0.004821 -0.004662
0.007276 0.006081 0.004989 0.004484 [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 3.42e-06 3.69e-07 1.65e-08 7.71e-10 3.81e-06 3.81e-06 erg/cm2
Error 2.79e-07 3.74e-08 4.52e-09 3.65e-10 2.73e-07 2.73e-07 erg/cm2
Peak flux Power-law 7.85e-01 8.24e-02 3.57e-03 1.61e-04 8.71e-01 8.71e-01 ph/cm2/s
Error 1.39e-01 4.25e-02 4.93e-03 4.08e-04 1.61e-01 1.61e-01 ph/cm2/s
Fluence Cutoff-PL 3.29e-06 2.92e-07 5.24e-10 1.53e-15 3.58e-06 3.58e-06 erg/cm2
Error 3.19e-07 4.66e-08 1.32e-09 3.54e-13 3.20e-07 3.20e-07 erg/cm2
Peak flux Cutoff-PL 8.16e-01 5.98e-02 2.43e-04 1.61e-08 8.75e-01 8.74e-01 ph/cm2/s
Error 1.56e-01 6.17e-02 4.37e-03 1.07e-04 1.58e-01 1.59e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.58e-01 4.43e-02 2.87e-04 1.80e-06 8.02e-01 8.02e-01 ph/cm2/s
Error 7.91e-02 -------- 5.24e-04 1.38e-05 7.93e-02 7.93e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.481 0.262 - - 1.26e-04 2.81e-05 80.440 57
CPL 1.000 0.000 50.0 0.0 2.30e-03 0.00e+00 712.270 56
The chi2 of BB fit is 67.78 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.530 0.921 - - 3.38e-04 3.96e-04 36.460 57
CPL 1.000 0.000 50.0 0.0 7.74e-03 0.00e+00 106.330 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 160.000 -39.000 121.000
T90 80.000 41.000 121.000
T50 48.000 57.000 105.000
Peak 1.000 96.500 97.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.3426 -17.3512 0.0295 0.1 39.3 -1.5873 -6.5 TRIG_01186296
------------------------------------------
Foreground time interval of the image:
-39.000 -34.640 (delta_t = 4.360 [sec])
-29.000 -15.740 (delta_t = 13.260 [sec])
-15.000 121.000 (delta_t = 136.000 [sec])
Background time interval of the image:
-119.000 -39.000 (delta_t = 80.000 [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
Multiple GTIs in the spectrum
tstart tstop
-39.000000 -34.640000
-29.000000 -15.740000
-15.000000 121.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.48110 ( -0.262707 0.261284 )
Norm@50keV : 1.25966E-04 ( -2.55248e-05 3.07712e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.44 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 57 degrees of freedom
# Null hypothesis probability = 2.213014e-02
Photon flux (15-150 keV) in 153.6 sec: 0.843952 ( -0.065664 0.0665147 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8102e-06 ( -2.71341e-07 2.74204e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-39.000000 -34.640000
-29.000000 -15.740000
-15.000000 121.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.29829E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 712.27 using 59 PHA bins.
# Reduced chi-squared = 12.719 for 56 degrees of freedom
# Null hypothesis probability = 1.675248e-114
Photon flux (15-150 keV) in 153.6 sec: 0.791882 ( -0.07855 0.076798 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5802e-06 ( -3.24142e-07 3.16646e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-39.000000 -34.640000
-29.000000 -15.740000
-15.000000 121.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60859 ( )
beta : -9.02363 ( )
Epeak [keV] : 3.88690 ( )
Norm@50keV : 4.35784E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 244.60 using 59 PHA bins.
# Reduced chi-squared = 4.4473 for 55 degrees of freedom
# Null hypothesis probability = 9.725115e-26
Photon flux (15-150 keV) in 153.6 sec: 0.802350 ( 6.19765 -0.08017 ) 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] : 2.58699 (-0.119567 0.130732)
R^2/D10^2 : 295.425 (-102.636 153.41)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.78 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.554410e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.180e-06 3.971e-07
25- 50 2.679e-07 3.226e-08
50-150 1.177e-10 5.850e-11
15-150 3.448e-06 3.817e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.34409 (-0.282344 0.32024)
Norm : 317.122 (-94.5753 132.387)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.314e-06 3.924e-07
25- 50 2.993e-07 3.556e-08
50-150 7.256e-10 3.318e-10
15-150 3.614e-06 3.878e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.57716 (-0.123655 0.127895)
R1^2/D10^2 : 304.136 (-105.839 188.466)
kT2 [keV] : 48.5012 (-45.0725 -45.0726)
R2^2/D10^2 : 4.16153E-05 (-5.41074e-05 -5.41797e-05)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.188e-06 3.786e-07
25- 50 2.765e-07 3.464e-08
50-150 1.431e-07 9.136e-08
15-150 3.608e-06 4.815e-07
Peak spectrum fit
Power-law model
Time interval is from 96.500 sec. to 97.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.52971 ( -0.840558 1.00152 )
Norm@50keV : 3.37965E-04 ( -0.000337965 0.000453862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.46 using 59 PHA bins.
# Reduced chi-squared = 0.6396 for 57 degrees of freedom
# Null hypothesis probability = 9.844622e-01
Photon flux (15-150 keV) in 1 sec: 0.871444 ( -0.160766 0.161024 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6866e-08 ( -5.48011e-09 5.69194e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 96.500 sec. to 97.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.74154E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.33 using 59 PHA bins.
# Reduced chi-squared = 1.8988 for 56 degrees of freedom
# Null hypothesis probability = 5.733635e-05
Photon flux (15-150 keV) in 1 sec: 0.874942 ( -0.157837 0.157458 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61463e-08 ( -5.048e-09 5.6211e-09 ) ergs/cm2
Band function
Time interval is from 96.500 sec. to 97.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.28029 ( 1.25982 1.25982 )
beta : -6.39066 ( 8.82927 18.6929 )
Epeak [keV] : 11.5344 ( -3.38592 6.03919 )
Norm@50keV : 1.56159E+05 ( -156206 1.21924e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.66 using 59 PHA bins.
# Reduced chi-squared = 0.6483 for 55 degrees of freedom
# Null hypothesis probability = 9.800197e-01
Photon flux (15-150 keV) in 1 sec: 0.802350 ( 6.19765 -0.08017 ) 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] : 2.53613 (-0.412724 0.499875)
R^2/D10^2 : 393.426 (-393.426 1097.53)
(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 2.394e-08 1.314e-08
25- 50 1.864e-09 1.132e-09
50-150 6.772e-13 7.650e-13
15-150 2.580e-08 1.453e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.74193 (-1.13668 1.6221)
Norm : 246.315 (-154.966 506.122)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.350e-08 1.169e-08
25- 50 2.627e-09 1.635e-09
50-150 1.035e-11 1.129e-11
15-150 2.613e-08 1.310e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.37584E-04 (0.000221041 -0.000137584)
R1^2/D10^2 : 3.41360E+05 (-341360 -341360)
kT2 [keV] : 2.53612 (-0.412719 0.499882)
R2^2/D10^2 : 393.433 (-393.433 1097.53)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.212e-08 1.777e-03
25- 50 4.713e-09 1.278e-02
50-150 1.811e-11 3.247e-01
15-150 2.685e-08 3.469e-01
Plot creation:
Mon Aug 21 20:26:44 EDT 2023