batgrbproduct analysis for trigger=1186294
batgrbproduct Analysis for Trigger=1186294
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 20:29:37 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1186294/GCN5_download_cron
======================================================================
Trigger: 01186294 Segment: 000
BAT Trigger Time: 714252544 [s; MET]
Trigger Stop: 714252608 [s; MET]
UTC: 2023-08-20T19:28:32.138340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 132.885552495404 Dec: -42.1417435704111 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.21
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.21
Flight Position: [ source = BAT ]
RA: 132.885552495404 Dec: -42.1417435704111 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.927753171068 Dec: -42.1328926504587 [deg; J2000]
{ 08h 51m 42.7s , -42d 07' 58.4" }
+/- 2.35305983575583 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14381793806426 [arcmin] (formal 1-sigma fit error)
SNR: 8.95806348173135
Angular difference between Flight and Ground position is 1.951263 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 98.1519998311996 +/- 37.2326534999948
Measured from: -26.4119998216629
to: 71.7400000095367 [s; relative to TRIGTIME]
T50: 45.1559998989105 +/- 23.9208949736548
Measured from: 4.57200014591217
to: 49.7280000448227 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.432000041008
to: 11.432000041008 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.3040000200272
to: 106.164000034332 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.955490 0.651926 0.017145 -0.048747
0.068659 0.069632 0.058776 0.051832 [error]
Peak 0.019751 0.023239 0.006322 0.003898
0.005867 0.006144 0.005136 0.004352 [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 2.99e-07 2.21e-07 1.08e-07 7.55e-08 6.64e-07 7.04e-07 erg/cm2
Error 3.75e-08 3.45e-08 3.53e-08 4.39e-08 9.36e-08 1.15e-07 erg/cm2
Peak flux Power-law 2.09e-01 1.39e-01 6.01e-02 3.57e-02 4.26e-01 4.44e-01 ph/cm2/s
Error 8.10e-02 4.77e-02 3.86e-02 4.80e-02 1.33e-01 1.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.83e-07 2.65e-07 2.96e-08 1.14e-10 5.78e-07 5.78e-07 erg/cm2
Error 4.32e-08 4.68e-08 2.67e-08 1.26e-09 7.28e-08 7.29e-08 erg/cm2
Peak flux Cutoff-PL 2.08e-01 1.44e-01 5.80e-02 2.19e-02 4.23e-01 4.33e-01 ph/cm2/s
Error 8.61e-02 6.71e-02 5.05e-02 4.74e-02 1.37e-01 1.51e-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 3.028 0.287 - - 4.09e-04 1.00e-04 79.360 57
CPL -0.528 2.401 21.1 6.2 1.21e-01 9.24e+00 66.200 56
The chi2 of BB fit is 66.06 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 2.209 0.692 - - 2.56e-03 1.90e-03 50.730 57
CPL 1.888 0.000 12.6 0.0 4.11e-03 0.00e+00 50.710 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 136.468 -30.304 106.164
T90 98.152 -26.412 71.740
T50 45.156 4.572 49.728
Peak 1.000 10.432 11.432
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.9278 -42.1329 0.0215 14.4 -128.4 1.3330 9.0 TRIG_01186294
------------------------------------------
Foreground time interval of the image:
-20.599 -16.630 (delta_t = 3.969 [sec])
-16.000 15.750 (delta_t = 31.750 [sec])
17.000 43.370 (delta_t = 26.370 [sec])
44.000 72.301 (delta_t = 28.301 [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
-30.304000 -16.630000
-16.000000 15.750000
17.000000 43.370000
44.000000 82.430000
83.000000 106.164000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.02834 ( -0.271664 0.302685 )
Norm@50keV : 4.09037E-04 ( -9.768e-05 0.000103225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.36 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.676190e-02
Photon flux (15-150 keV) in 133.4 sec: 0.114837 ( -0.0128667 0.0128754 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.64341e-07 ( -9.13511e-08 9.5819e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-30.304000 -16.630000
-16.000000 15.750000
17.000000 43.370000
44.000000 82.430000
83.000000 106.164000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.528488 ( -3.13648 1.66518 )
Epeak [keV] : 21.1033 ( -7.67008 4.64625 )
Norm@50keV : 0.120575 ( -0.130765 18.341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.20 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 56 degrees of freedom
# Null hypothesis probability = 1.652518e-01
Photon flux (15-150 keV) in 133.4 sec: 0.109166 ( -0.0127328 0.012731 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78013e-07 ( -7.06753e-08 7.49108e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-30.304000 -16.630000
-16.000000 15.750000
17.000000 43.370000
44.000000 82.430000
83.000000 106.164000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.49657 ( -3.11157 1.89489 )
beta : -9.62231 ( 9.98495 19.9595 )
Epeak [keV] : 22.7226 ( -2.332 2.52464 )
Norm@50keV : 0.574112 ( -0.0621891 17.8986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.19 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.435863e-01
Photon flux (15-150 keV) in 133.4 sec: 0.128974 ( ) 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] : 5.93597 (-0.592013 0.63194)
R^2/D10^2 : 0.450163 (-0.164069 0.27293)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.06 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.924427e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.768e-07 4.649e-08
25- 50 2.696e-07 5.403e-08
50-150 2.363e-08 1.078e-08
15-150 5.701e-07 9.318e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.2822 (-3.52504 4.59601)
Norm : 1.56786 (-0.388633 0.55235)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.994e-07 4.102e-08
25- 50 2.440e-07 4.622e-08
50-150 6.257e-08 3.158e-08
15-150 6.059e-07 1.017e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.80826 (-1.27195 1.99051)
R1^2/D10^2 : 93.3766 (-104.445 -104.795)
kT2 [keV] : 6.37044 (-0.766647 0.859867)
R2^2/D10^2 : 0.306023 (-0.150116 0.223213)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.841e-07 1.343e-07
25- 50 2.712e-07 1.503e-07
50-150 3.147e-08 2.207e-08
15-150 5.868e-07 2.436e-07
Peak spectrum fit
Power-law model
Time interval is from 10.432 sec. to 11.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20942 ( -0.595024 0.788951 )
Norm@50keV : 2.56228E-03 ( -0.00256228 0.00123291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.8899 for 57 degrees of freedom
# Null hypothesis probability = 7.079786e-01
Photon flux (15-150 keV) in 1 sec: 0.426305 ( -0.133142 0.13341 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41231e-08 ( -9.72755e-09 1.07964e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.432 sec. to 11.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88849 ( )
Epeak [keV] : 12.5620 ( )
Norm@50keV : 4.11170E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9054 for 56 degrees of freedom
# Null hypothesis probability = 6.748909e-01
Photon flux (15-150 keV) in 1 sec: 0.422964 ( -0.137281 0.136017 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31722e-08 ( -1.05206e-08 1.16079e-08 ) ergs/cm2
Band function
Time interval is from 10.432 sec. to 11.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33615 ( 1.29102 1.29102 )
beta : -2.58548 ( 2.57354 0.94359 )
Epeak [keV] : 24.9919 ( -25.4633 86.9533 )
Norm@50keV : 9.71463E-03 ( -0.011496 1.5483e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9197 for 55 degrees of freedom
# Null hypothesis probability = 6.438790e-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] : 7.80119 (-2.33377 3.18011)
R^2/D10^2 : 0.531787 (-0.531627 1.63713)
(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 5.740e-09 3.460e-09
25- 50 9.613e-09 5.795e-09
50-150 2.322e-09 1.972e-09
15-150 1.768e-08 1.100e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.3232 (-24.1827 105.461)
Norm : 2.67666 (-1.19388 2.73091)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.259e-09 3.308e-09
25- 50 8.433e-09 5.086e-09
50-150 6.932e-09 5.375e-09
15-150 2.163e-08 1.382e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 198.061 (-198.068 -198.068)
R1^2/D10^2 : 3.15343E-05 (-3.15102e-05 1.418)
kT2 [keV] : 7.25478 (-7.25596 2.98701)
R2^2/D10^2 : 0.678203 (-0.677696 22.1623)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.065e-09 3.026e-09
25- 50 8.950e-09 5.690e-09
50-150 3.957e-09 2.696e-09
15-150 1.897e-08 1.128e-08
Plot creation:
Mon Aug 21 20:31:36 EDT 2023