batgrbproduct analysis for trigger=1056426
batgrbproduct Analysis for Trigger=1056426
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): Sat Jun 19 09:51:44 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1056426/GCN5_download_cron
======================================================================
Trigger: 01056426 Segment: 000
BAT Trigger Time: 645673444.224 [s; MET]
Trigger Stop: 645673444.736 [s; MET]
UTC: 2021-06-18T01:43:37.008340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.820334978217 Dec: 46.0433632334042 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 12.369316876853 [ if not an image trigger ]
Image S/N Ratio: 7.01
Flight Position: [ source = BAT ]
RA: 235.820334978217 Dec: 46.0433632334042 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.759326457346 Dec: 46.0750331633945 [deg; J2000]
{ 15h 43m 02.2s , +46d 04' 30.1" }
+/- 1.97898225052628 [arcmin] (estimated 90% radius based on SNR)
+/- 0.884893945195658 [arcmin] (formal 1-sigma fit error)
SNR: 11.4717573642275
Angular difference between Flight and Ground position is 3.172186 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 2.1599999666214 +/- 0.446891464130712
Measured from: -1.36399984359741
to: 0.796000123023987 [s; relative to TRIGTIME]
T50: 1.2279999256134 +/- 0.482464493772348
Measured from: -0.879999876022339
to: 0.348000049591064 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.495999932289124
to: 0.504000067710876 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.41999995708466
to: 1.02400004863739 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057290 0.102671 0.076080 0.036382
0.011845 0.013119 0.013242 0.014430 [error]
Peak 0.035194 0.054976 0.045384 0.014307
0.007656 0.008702 0.008683 0.009358 [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 1.64e-08 3.69e-08 6.57e-08 2.75e-07 1.79e-07 3.94e-07 erg/cm2
Error 4.41e-09 5.83e-09 1.30e-08 1.25e-07 3.27e-08 1.34e-07 erg/cm2
Peak flux Power-law 2.81e-01 3.51e-01 3.19e-01 5.06e-01 1.12e+00 1.46e+00 ph/cm2/s
Error 9.19e-02 6.82e-02 7.16e-02 2.50e-01 1.96e-01 3.06e-01 ph/cm2/s
Fluence Cutoff-PL 1.65e-08 3.70e-08 6.54e-08 2.69e-07 1.78e-07 3.88e-07 erg/cm2
Error 4.44e-09 5.97e-09 1.30e-08 1.71e-07 3.33e-08 1.29e-07 erg/cm2
Peak flux Cutoff-PL 2.84e-01 3.52e-01 3.18e-01 4.94e-01 1.12e+00 1.45e+00 ph/cm2/s
Error 9.29e-02 6.86e-02 7.15e-02 4.48e-01 1.96e-01 3.45e-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 1.168 0.278 - - 7.15e-03 1.07e-03 62.270 57
CPL 1.163 0.544 9999.2 0.0 7.18e-03 6.19e-03 62.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.136 0.331 - - 9.66e-03 1.71e-03 89.460 57
CPL 1.126 0.454 9999.1 0.0 9.70e-03 8.58e-03 89.470 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 2.444 -1.420 1.024
T90 2.160 -1.364 0.796
T50 1.228 -0.880 0.348
Peak 1.000 -0.496 0.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.7593 +46.0750 0.0168 13.1 -156.5 0.3155 11.5 TRIG_01056426
------------------------------------------
Foreground time interval of the image:
-1.420 1.024 (delta_t = 2.444 [sec])
Background time interval of the image:
-119.224 -1.420 (delta_t = 117.804 [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 -1.420 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16782 ( -0.279679 0.277271 )
Norm@50keV : 7.15272E-03 ( -0.0010738 0.00106689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.94e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 2.444 sec: 0.835978 ( -0.122811 0.122828 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79006e-07 ( -3.22403e-08 3.32294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.420 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16339 ( -0.80858 0.278822 )
Epeak [keV] : 9999.25 ( -9999.36 -9999.36 )
Norm@50keV : 7.17625E-03 ( -0.00105545 0.0113209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.28 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.63e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 2.444 sec: 0.835859 ( -0.122706 0.122676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78343e-07 ( -3.33115e-08 3.32159e-08 ) ergs/cm2
Band function
Time interval is from -1.420 sec. to 1.024 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.126589 ( 0.724135 0.724135 )
beta : -1.24663 ( 1.21413 0.319735 )
Epeak [keV] : 55.9978 ( -55.1979 370.953 )
Norm@50keV : 3.50570E-02 ( -0.0354968 421518 )
------------------------------------------------------------
Photon flux (15-150 keV) in 2.444 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] : 15.6144 (-3.13453 4.5256)
R^2/D10^2 : 8.33308E-02 (-0.0466593 0.0926424)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 74.22 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.24e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-08 3.056e-09
25- 50 4.252e-08 1.077e-08
50-150 7.176e-08 2.475e-08
15-150 1.246e-07 3.056e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-57.1288 -200)
Norm : 3.30439 (-0.496964 0.496964)
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.66e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.019e-08 1.146e-08
25- 50 3.884e-08 2.187e-08
50-150 8.517e-08 4.725e-08
15-150 1.442e-07 8.104e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1476 (-2.61159 3.09616)
R1^2/D10^2 : 0.282843 (-0.19116 0.549091)
kT2 [keV] : 200.000 (-167.029 -200)
R2^2/D10^2 : 1.74491E-04 (-3.50071e-05 0.000714112)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.41 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.18e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.540e-08 9.121e-09
25- 50 4.074e-08 2.086e-08
50-150 1.287e-07 8.421e-08
15-150 1.848e-07 1.050e-07
Peak spectrum fit
Power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13629 ( -0.334391 0.327218 )
Norm@50keV : 9.65885E-03 ( -0.00171634 0.00170526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 89.46 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.89e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.12463 ( -0.196226 0.196246 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98456e-08 ( -2.12836e-08 2.20173e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.496 sec. to 0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12587 ( -0.576929 0.330795 )
Epeak [keV] : 9999.09 ( -9999.35 -9999.35 )
Norm@50keV : 9.70006E-03 ( -0.00170777 0.0154521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 89.47 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.99e-03 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.12447 ( -0.196216 0.19605 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92418e-08 ( -2.13371e-08 2.26442e-08 ) ergs/cm2
Band function
Time interval is from -0.496 sec. to 0.504 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.82950 ( -4.8295 -4.8295 )
beta : -1.30293 ( -0.512869 0.406306 )
Epeak [keV] : 29.0027 ( -29.0027 63.8776 )
Norm@50keV : 251.175 ( -43.5695 2.90345e+06 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 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] : 16.9667 (-5.00491 8.52795)
R^2/D10^2 : 8.45196E-02 (-0.0826837 0.179025)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 101.46 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.66e-04 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.958e-09 2.033e-09
25- 50 2.190e-08 9.592e-09
50-150 4.499e-08 1.789e-08
15-150 7.185e-08 2.477e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-68.0279 -200)
Norm : 4.41741 (-0.792097 0.792098)
------------------------------------------------------------
#Fit statistic : Chi-Squared 93.72 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.57e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.104e-08 6.430e-09
25- 50 2.123e-08 1.224e-08
50-150 4.656e-08 2.672e-08
15-150 7.882e-08 4.478e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.64659 (-2.2519 3.13188)
R1^2/D10^2 : 0.870392 (-0.592579 2.05947)
kT2 [keV] : 50.3656 (-23.065 -50.3759)
R2^2/D10^2 : 3.06929E-03 (-0.00275062 0.00742918)
------------------------------------------------------------
#Fit statistic : Chi-Squared 86.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.47e-03 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.725e-09 5.620e-09
25- 50 2.047e-08 1.089e-08
50-150 7.854e-08 4.245e-08
15-150 1.087e-07 5.590e-08
Plot creation:
Sat Jun 19 09:56:22 EDT 2021