batgrbproduct analysis for trigger=1126854
batgrbproduct Analysis for Trigger=1126854
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 Oct 10 21:05:20 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1126854/GCN5_download_cron
======================================================================
Trigger: 01126854 Segment: 000
BAT Trigger Time: 687017856 [s; MET]
Trigger Stop: 687017920 [s; MET]
UTC: 2022-10-09T14:17:05.995200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.275175179698 Dec: 19.7721721338671 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.95
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.95
Flight Position: [ source = BAT ]
RA: 288.275175179698 Dec: 19.7721721338671 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.271504694335 Dec: 19.7755461900339 [deg; J2000]
{ 19h 13m 05.2s , +19d 46' 32.0" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 0.774699313520381 [arcmin] (formal 1-sigma fit error)
SNR: -13.916635859283
Angular difference between Flight and Ground position is 0.289712 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 483.479999899864 +/- 346.381171531333
Measured from: -67.7959998846054
to: 415.684000015259 [s; relative to TRIGTIME]
T50: 254.051999926567 +/- 376.493503413487
Measured from: -7.35599982738495
to: 246.696000099182 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 368.468000054359
to: 369.468000054359 [s; relative to TRIGTIME]
Total Fluence
Measured from: -81.3359999656677
to: 572.503999948502 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 19.178132 17.728400 8.965156 1.483941
0.213605 0.216159 0.188150 0.175432 [error]
Peak 0.045925 0.045581 0.024865 0.011756
0.008237 0.008367 0.007362 0.006842 [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 5.57e-06 7.19e-06 6.79e-06 1.13e-05 2.33e-05 3.09e-05 erg/cm2
Error 2.38e-07 1.64e-07 2.10e-07 8.02e-07 4.90e-07 9.12e-07 erg/cm2
Peak flux Power-law 4.61e-01 3.29e-01 1.56e-01 1.03e-01 9.95e-01 1.05e+00 ph/cm2/s
Error 1.22e-01 6.53e-02 5.89e-02 7.46e-02 1.90e-01 2.08e-01 ph/cm2/s
Fluence Cutoff-PL 5.57e-06 7.20e-06 6.79e-06 1.12e-05 2.33e-05 3.08e-05 erg/cm2
Error 2.55e-07 1.64e-07 2.10e-07 1.25e-06 4.87e-07 1.55e-06 erg/cm2
Peak flux Cutoff-PL 4.60e-01 3.30e-01 1.56e-01 1.03e-01 9.95e-01 1.05e+00 ph/cm2/s
Error 1.30e-01 7.63e-02 5.98e-02 7.99e-02 1.90e-01 2.18e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.34e-01 3.14e-01 1.48e-01 9.22e-02 9.42e-01 9.89e-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 2.083 0.046 - - 3.87e-03 8.50e-05 44.030 57
CPL 1.996 -0.950 2.9 14.9 4.23e-03 2.05e-04 45.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.082 0.414 - - 6.38e-03 1.81e-03 66.250 57
CPL 1.985 0.000 7.2 0.0 7.20e-03 0.00e+00 66.260 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: 472.064000 sec.
T50 in the 50-300 keV band: 472.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 653.840 -81.336 572.504
T90 483.480 -67.796 415.684
T50 254.052 -7.356 246.696
Peak 1.000 368.468 369.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
288.2715 +19.7755 0.0139 0.0 133.7 -12.6988 -13.9 TRIG_01126854
------------------------------------------
Foreground time interval of the image:
-81.336 93.320 (delta_t = 174.656 [sec])
94.000 154.610 (delta_t = 60.610 [sec])
156.000 231.950 (delta_t = 75.950 [sec])
233.000 320.050 (delta_t = 87.050 [sec])
321.000 420.750 (delta_t = 99.750 [sec])
421.000 572.504 (delta_t = 151.504 [sec])
Background time interval of the image:
-239.000 -217.060 (delta_t = 21.940 [sec])
-216.000 -99.200 (delta_t = 116.800 [sec])
-97.000 -81.336 (delta_t = 15.664 [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
-81.336000 93.320000
94.000000 154.610000
156.000000 231.950000
233.000000 320.050000
321.000000 420.750000
421.000000 572.504000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08253 ( -0.0463482 0.0466012 )
Norm@50keV : 3.87438E-03 ( -8.51656e-05 8.48821e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.03 using 59 PHA bins.
# Reduced chi-squared = 0.7725 for 57 degrees of freedom
# Null hypothesis probability = 8.957351e-01
Photon flux (15-150 keV) in 649.5 sec: 0.604336 ( -0.0157345 0.0158603 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33422e-05 ( -4.9022e-07 4.90502e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-81.336000 93.320000
94.000000 154.610000
156.000000 231.950000
233.000000 320.050000
321.000000 420.750000
421.000000 572.504000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99550 ( -0.096377 -1.9955 )
Epeak [keV] : 2.86827 ( -1.06894 28.6606 )
Norm@50keV : 4.23413E-03 ( -0.000203383 0.000206193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.8090 for 56 degrees of freedom
# Null hypothesis probability = 8.460111e-01
Photon flux (15-150 keV) in 649.5 sec: 0.603886 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33382e-05 ( -4.8654e-07 4.86865e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-81.336000 93.320000
94.000000 154.610000
156.000000 231.950000
233.000000 320.050000
321.000000 420.750000
421.000000 572.504000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55424 ( 1.55445 1.55445 )
beta : -2.08804 ( 2.08792 0.0503769 )
Epeak [keV] : 21.3884 ( -21.3575 11.3278 )
Norm@50keV : 9.44775E-03 ( -0.00455441 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.88 using 59 PHA bins.
# Reduced chi-squared = 0.7979 for 55 degrees of freedom
# Null hypothesis probability = 8.591652e-01
Photon flux (15-150 keV) in 649.5 sec: 0.689975 ( 6.31002 -0.689975 ) 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] : 12.0886 ( )
R^2/D10^2 : 0.117126 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 580.37 using 59 PHA bins.
# Reduced chi-squared = 10.182 for 57 degrees of freedom
# Null hypothesis probability = 9.579058e-88
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.353e-06 9.905e-08
25- 50 7.468e-06 2.046e-07
50-150 6.594e-06 2.975e-07
15-150 1.641e-05 3.540e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.1799 (-5.14626 5.78514)
Norm : 2.72111 (-0.116799 0.123539)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.554e-06 1.572e-07
25- 50 7.332e-06 1.689e-07
50-150 9.728e-06 4.157e-07
15-150 2.161e-05 5.196e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.30038 (-0.455335 0.476695)
R1^2/D10^2 : 1.15625 (-0.288398 0.416655)
kT2 [keV] : 22.5930 (-1.82664 2.24215)
R2^2/D10^2 : 7.93986E-03 (-0.00244248 0.00317814)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.716e-06 3.429e-07
25- 50 7.272e-06 2.468e-07
50-150 1.038e-05 6.527e-07
15-150 2.237e-05 8.996e-07
Peak spectrum fit
Power-law model
Time interval is from 368.468 sec. to 369.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08164 ( -0.379466 0.449534 )
Norm@50keV : 6.38424E-03 ( -0.00186559 0.00174854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.881107e-01
Photon flux (15-150 keV) in 1 sec: 0.995400 ( -0.190337 0.190375 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92154e-08 ( -1.47829e-08 1.55659e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 368.468 sec. to 369.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98529 ( )
Epeak [keV] : 7.17307 ( )
Norm@50keV : 7.20162E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.26 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 56 degrees of freedom
# Null hypothesis probability = 1.640081e-01
Photon flux (15-150 keV) in 1 sec: 0.995067 ( -0.189961 0.190003 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91924e-08 ( -1.5773e-08 8.4992e-09 ) ergs/cm2
Band function
Time interval is from 368.468 sec. to 369.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.77084 ( 1.64499 2.77084 )
beta : -2.08164 ( -0.449533 0.380008 )
Epeak [keV] : 64.5429 ( -64.5429 -64.5429 )
Norm@50keV : 0.867708 ( -0.25356 0.237653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.424250e-01
Photon flux (15-150 keV) in 1 sec: 0.942132 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55681e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6749 (-2.74425 3.11009)
R^2/D10^2 : 0.354674 (-0.214686 0.7049)
(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 8.389e-09 3.410e-09
25- 50 2.281e-08 7.485e-09
50-150 1.434e-08 7.653e-09
15-150 4.554e-08 1.471e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.9558 (-28.484 75.3854)
Norm : 5.08556 (-1.38996 2.10861)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.288e-08 3.508e-09
25- 50 1.988e-08 6.285e-09
50-150 2.353e-08 1.401e-08
15-150 5.629e-08 1.987e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.85807 (-1.47147 1.85988)
R1^2/D10^2 : 72.9343 (-67.4699 20172.9)
kT2 [keV] : 14.8088 (-3.78161 6.01844)
R2^2/D10^2 : 8.99271E-02 (-0.066114 0.191166)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.416e-08 7.305e-09
25- 50 1.747e-08 9.891e-09
50-150 2.410e-08 1.548e-08
15-150 5.574e-08 3.031e-08
Plot creation:
Mon Oct 10 21:08:22 EDT 2022