batgrbproduct analysis for trigger=1216804
batgrbproduct Analysis for Trigger=1216804
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): Thu Feb 22 19:13:51 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1216804/GCN5_download_cron
======================================================================
Trigger: 01216804 Segment: 000
BAT Trigger Time: 730284724.288 [s; MET]
Trigger Stop: 730284725.312 [s; MET]
UTC: 2024-02-22T08:51:31.328680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 143.247834483184 Dec: -68.0289508826161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 29.2232783924049 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 143.247834483184 Dec: -68.0289508826161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 143.209169722361 Dec: -68.0343602281288 [deg; J2000]
{ 09h 32m 50.2s , -68d 02' 03.7" }
+/- 1.8338132284061 [arcmin] (estimated 90% radius based on SNR)
+/- 0.754752556551517 [arcmin] (formal 1-sigma fit error)
SNR: 12.7907734502661
Angular difference between Flight and Ground position is 0.926560 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 3.94399988651276 +/- 2.35086371750405
Measured from: -2.66799986362457
to: 1.27600002288818 [s; relative to TRIGTIME]
T50: 0.959999918937683 +/- 2.40068319584733
Measured from: -0.0559998750686646
to: 0.904000043869019 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.203999996185303
to: 0.796000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.7039999961853
to: 1.36800003051758 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.041775 0.105454 0.133262 0.040539
0.013618 0.014286 0.012904 0.011191 [error]
Peak 0.018747 0.061284 0.064140 0.033008
0.006920 0.007546 0.007426 0.006404 [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 1.35e-08 3.95e-08 9.36e-08 6.09e-07 2.53e-07 7.56e-07 erg/cm2
Error 3.96e-09 6.92e-09 1.18e-08 1.84e-07 3.23e-08 1.86e-07 erg/cm2
Peak flux Power-law 2.37e-01 3.59e-01 4.07e-01 8.79e-01 1.27e+00 1.88e+00 ph/cm2/s
Error 6.77e-02 6.32e-02 5.58e-02 2.60e-01 1.72e-01 2.87e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-08 4.00e-08 1.03e-07 2.55e-07 2.46e-07 4.08e-07 erg/cm2
Error 5.00e-09 7.82e-09 1.54e-08 2.55e-07 3.42e-08 2.72e-07 erg/cm2
Peak flux Cutoff-PL 1.70e-01 3.71e-01 4.60e-01 3.58e-01 1.21e+00 1.36e+00 ph/cm2/s
Error 7.94e-02 7.30e-02 7.35e-02 2.98e-01 1.79e-01 3.46e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.18e-02 1.15e-01 1.83e-01 3.51e-01 4.78e-01 6.99e-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 0.754 0.226 - - 5.21e-03 7.09e-04 55.410 57
CPL -0.104 1.069 155.1 -50.0 1.13e-02 1.29e-02 52.940 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.819 0.227 - - 1.10e-02 1.52e-03 52.600 57
CPL -0.323 1.144 120.9 178.1 3.36e-02 4.83e-02 48.550 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: 3.904000 sec.
T50 in the 50-300 keV band: 0.832000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.072 -2.704 1.368
T90 3.944 -2.668 1.276
T50 0.960 -0.056 0.904
Peak 1.000 -0.204 0.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
143.2092 -68.0344 0.0151 24.3 -157.9 0.3511 12.8 TRIG_01216804
------------------------------------------
Foreground time interval of the image:
-2.704 1.368 (delta_t = 4.072 [sec])
Background time interval of the image:
-60.288 -2.704 (delta_t = 57.584 [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 -2.704 sec. to 1.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.753964 ( -0.233534 0.218576 )
Norm@50keV : 5.21231E-03 ( -0.000716014 0.000701799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 57 degrees of freedom
# Null hypothesis probability = 5.348412e-01
Photon flux (15-150 keV) in 4.072 sec: 0.600317 ( -0.0781959 0.0787978 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52957e-07 ( -3.22664e-08 3.23972e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.704 sec. to 1.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.103996 ( -1.22003 0.918593 )
Epeak [keV] : 155.060 ( -54.969 -155.06 )
Norm@50keV : 1.13481E-02 ( -0.00631151 0.0194368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.94 using 59 PHA bins.
# Reduced chi-squared = 0.9453 for 56 degrees of freedom
# Null hypothesis probability = 5.916038e-01
Photon flux (15-150 keV) in 4.072 sec: 0.577356 ( -0.081914 0.082526 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45648e-07 ( -3.43656e-08 3.40032e-08 ) ergs/cm2
Band function
Time interval is from -2.704 sec. to 1.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.105235 ( -0.883745 1.04672 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 154.701 ( -38.1193 68.2825 )
Norm@50keV : 1.13786E-02 ( -0.0063396 0.0194357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.94 using 59 PHA bins.
# Reduced chi-squared = 0.9625 for 55 degrees of freedom
# Null hypothesis probability = 5.538980e-01
Photon flux (15-150 keV) in 4.072 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] : 27.0507 (-4.17085 5.55073)
R^2/D10^2 : 1.22786E-02 (-0.00515977 0.0081023)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9751 for 57 degrees of freedom
# Null hypothesis probability = 5.284867e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.086e-09 1.619e-09
25- 50 3.588e-08 7.716e-09
50-150 1.917e-07 4.001e-08
15-150 2.337e-07 4.280e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-22.0239 -200)
Norm : 2.44538 (-0.332488 0.332488)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.480e-08 1.379e-08
25- 50 4.772e-08 2.659e-08
50-150 1.046e-07 5.825e-08
15-150 1.772e-07 9.787e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.80382 (-4.69472 15.2357)
R1^2/D10^2 : 0.114147 (-0.107486 2.41941)
kT2 [keV] : 33.1457 (-7.93782 -33.1722)
R2^2/D10^2 : 6.14431E-03 (-0.00583945 0.00862568)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.097e-08 6.220e-09
25- 50 4.011e-08 2.134e-08
50-150 1.970e-07 1.056e-07
15-150 2.480e-07 1.286e-07
Peak spectrum fit
Power-law model
Time interval is from -0.204 sec. to 0.796 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.818774 ( -0.232742 0.222178 )
Norm@50keV : 1.10277E-02 ( -0.00152612 0.00151155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9227 for 57 degrees of freedom
# Null hypothesis probability = 6.408465e-01
Photon flux (15-150 keV) in 1 sec: 1.26671 ( -0.171804 0.172421 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27862e-07 ( -1.8029e-08 1.81622e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.204 sec. to 0.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.322601 ( -1.30243 0.986526 )
Epeak [keV] : 120.886 ( -35.903 320.299 )
Norm@50keV : 3.35824E-02 ( -0.0204516 0.0762167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.55 using 59 PHA bins.
# Reduced chi-squared = 0.8670 for 56 degrees of freedom
# Null hypothesis probability = 7.498577e-01
Photon flux (15-150 keV) in 1 sec: 1.21086 ( -0.17827 0.17889 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21416e-07 ( -1.986e-08 1.9616e-08 ) ergs/cm2
Band function
Time interval is from -0.204 sec. to 0.796 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.987636 ( -0.90492 1.07711 )
beta : -1.30764 ( 9.37167 19.3717 )
Epeak [keV] : 83.2392 ( -27.4054 114.217 )
Norm@50keV : 8.02379E-02 ( -0.06128 21.2712 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.44 using 59 PHA bins.
# Reduced chi-squared = 0.8808 for 55 degrees of freedom
# Null hypothesis probability = 7.216659e-01
Photon flux (15-150 keV) in 1 sec: 0.478329 ( ) 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] : 24.0296 (-3.81739 4.9378)
R^2/D10^2 : 3.67543E-02 (-0.0157569 0.0256849)
(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 3.763e-09 1.184e-09
25- 50 2.091e-08 4.740e-09
50-150 8.996e-08 2.096e-08
15-150 1.146e-07 2.446e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-26.6923 -200)
Norm : 4.97786 (-0.717379 0.717379)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.240e-08 7.110e-09
25- 50 2.385e-08 1.349e-08
50-150 5.230e-08 2.966e-08
15-150 8.855e-08 5.015e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.9008 (-12.0009 -12.0009)
R1^2/D10^2 : 0.118006 (-0.115989 -0.115989)
kT2 [keV] : 32.9580 (-34.2298 -34.2298)
R2^2/D10^2 : 1.12915E-02 (-0.00980635 0.0354313)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.340e-09 3.486e-09
25- 50 2.257e-08 1.314e-08
50-150 9.437e-08 5.120e-08
15-150 1.223e-07 6.425e-08
Plot creation:
Thu Feb 22 19:15:54 EST 2024