batgrbproduct analysis for trigger=1031636
batgrbproduct Analysis for Trigger=1031636
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): Wed Feb 10 21:11:15 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1031636/batgroup_hand_proc
======================================================================
Trigger: 01031636 Segment: 000
BAT Trigger Time: 634599611.008 [s; MET]
Trigger Stop: 634599623.168 [s; MET]
UTC: 2021-02-09T21:39:44.528860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.09639350866 Dec: 43.5587284402821 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.25
Image Trigger?: NO
Rate S/N Ratio: 10.816653826392 [ if not an image trigger ]
Image S/N Ratio: 10.25
Flight Position: [ source = BAT ]
RA: 328.09639350866 Dec: 43.5587284402821 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.096894964307 Dec: 43.544558828875 [deg; J2000]
{ 21h 52m 23.3s , +43d 32' 40.4" }
+/- 1.55235644196789 [arcmin] (estimated 90% radius based on SNR)
+/- 0.604041941013436 [arcmin] (formal 1-sigma fit error)
SNR: 16.2283159316985
Angular difference between Flight and Ground position is 0.850456 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 139.407999992371 +/- 21.5133887433406
Measured from: -24.1240000724792
to: 115.283999919891 [s; relative to TRIGTIME]
T50: 70 +/- 6.48419902027476
Measured from: 4.10399997234344
to: 74.1039999723434 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.68400001525879
to: 3.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.3359999656677
to: 134.715999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.048368 1.469829 1.083165 0.299598
0.081800 0.083667 0.074208 0.067354 [error]
Peak 0.022781 0.021681 0.019738 0.010527
0.006252 0.006594 0.005778 0.005399 [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 3.26e-07 5.92e-07 8.27e-07 2.41e-06 2.37e-06 4.16e-06 erg/cm2
Error 3.78e-08 4.04e-08 7.46e-08 4.80e-07 1.77e-07 5.34e-07 erg/cm2
Peak flux Power-law 1.83e-01 1.94e-01 1.45e-01 1.76e-01 5.89e-01 6.98e-01 ph/cm2/s
Error 9.33e-02 5.55e-02 5.24e-02 1.49e-01 1.53e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 3.27e-07 5.93e-07 8.25e-07 2.38e-06 2.37e-06 4.12e-06 erg/cm2
Error 3.81e-08 3.58e-08 7.38e-08 5.65e-07 1.75e-07 6.01e-07 erg/cm2
Peak flux Cutoff-PL 1.94e-01 1.96e-01 1.40e-01 1.59e-01 5.92e-01 6.88e-01 ph/cm2/s
Error 6.97e-02 5.60e-02 4.07e-02 1.74e-01 1.51e-01 1.49e-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 1.518 0.123 - - 1.43e-03 9.62e-05 51.280 57
CPL 1.511 0.124 9999.2 0.0 1.44e-03 3.34e-04 51.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.417 0.575 - - 4.82e-03 1.30e-03 50.150 57
CPL 6.727 2.786 707.1 102.2 1.66e-05 7.49e-04 45.120 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: 153.792000 sec.
T50 in the 50-300 keV band: 84.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 175.052 -40.336 134.716
T90 139.408 -24.124 115.284
T50 70.000 4.104 74.104
Peak 1.000 2.684 3.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.0969 +43.5446 0.0119 21.5 -11.2 2.2506 16.2 TRIG_01031636
------------------------------------------
Foreground time interval of the image:
-40.336 57.293 (delta_t = 97.629 [sec])
Background time interval of the image:
-239.008 -40.336 (delta_t = 198.672 [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 -40.336 sec. to 134.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51791 ( -0.122361 0.123127 )
Norm@50keV : 1.43216E-03 ( -9.64307e-05 9.59285e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.28 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.89e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 175.1 sec: 0.179664 ( -0.0119357 0.0119585 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37213e-06 ( -1.76259e-07 1.77728e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.336 sec. to 134.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51149 ( -0.121394 0.125688 )
Epeak [keV] : 9999.25 ( -9999.35 -9999.35 )
Norm@50keV : 1.43683E-03 ( -9.61532e-05 0.000572169 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.53e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 175.1 sec: 0.179654 ( -0.011997 0.011887 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3694e-06 ( -1.73682e-07 1.76396e-07 ) ergs/cm2
Band function
Time interval is from -40.336 sec. to 134.716 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10388 ( 1.09647 1.09647 )
beta : -1.52996 ( 1.53334 0.137002 )
Epeak [keV] : 57.1897 ( -58.1631 -58.1631 )
Norm@50keV : 2.85112E-03 ( -0.00148803 0.0726189 )
------------------------------------------------------------
Photon flux (15-150 keV) in 175.1 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] : 14.6700 ( )
R^2/D10^2 : 2.09884E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 127.21 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.83e-07 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.662e-07 2.050e-08
25- 50 6.466e-07 5.489e-08
50-150 9.375e-07 1.252e-07
15-150 1.750e-06 1.568e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-43.6866 -200)
Norm : 0.728272 (-0.0472853 0.0472853)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.30 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.77e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.183e-07 2.618e-08
25- 50 6.124e-07 5.700e-08
50-150 1.343e-06 3.286e-07
15-150 2.274e-06 4.813e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83679 (-1.1301 1.28117)
R1^2/D10^2 : 0.224685 (-0.101067 0.210243)
kT2 [keV] : 31.0443 (-6.25797 11.246)
R2^2/D10^2 : 1.33791E-03 (-0.00081264 0.00150173)
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.82 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.72e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.227e-07 7.591e-08
25- 50 5.930e-07 1.077e-07
50-150 1.509e-06 6.241e-07
15-150 2.424e-06 6.642e-07
Peak spectrum fit
Power-law model
Time interval is from 2.684 sec. to 3.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41704 ( -0.568418 0.58217 )
Norm@50keV : 4.82140E-03 ( -0.00133667 0.00126316 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.28e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.589436 ( -0.152685 0.152791 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64344e-08 ( -1.43363e-08 1.47018e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.684 sec. to 3.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.72658 ( -4.24068 1.33193 )
Epeak [keV] : 707.090 ( -66.9059 137.567 )
Norm@50keV : 1.65995E-05 ( -1.59422e-05 0.001483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.51e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.592331 ( -0.152232 0.150542 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59007e-08 ( -1.37015e-08 1.42112e-08 ) ergs/cm2
Band function
Time interval is from 2.684 sec. to 3.684 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16086 ( 1.16107 1.16107 )
beta : -1.41525 ( 1.41627 0.569117 )
Epeak [keV] : 28.5101 ( -28.6115 -28.6115 )
Norm@50keV : 9.72050E-03 ( -0.00612306 0.127901 )
------------------------------------------------------------
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] : 16.4057 (-6.03589 18.0579)
R^2/D10^2 : 4.58157E-02 (-0.0438477 0.169893)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.20 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.95e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.535e-09 1.619e-09
25- 50 1.089e-08 6.270e-09
50-150 2.068e-08 1.317e-08
15-150 3.411e-08 2.039e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-120.037 -199.363)
Norm : 2.38761 (-0.615571 0.615584)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.39 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.85e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.945e-09 3.714e-09
25- 50 1.144e-08 6.945e-09
50-150 2.508e-08 1.470e-08
15-150 4.246e-08 2.592e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.93821 (-2.69829 6.77613)
R1^2/D10^2 : 40.8331 (-35.8063 -35.9514)
kT2 [keV] : 32.5191 (-17.8888 -33.3171)
R2^2/D10^2 : 5.03317E-03 (-0.0042607 0.0603014)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.19 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.30e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.491e-09 4.320e-09
25- 50 5.946e-09 3.370e-09
50-150 3.631e-08 2.217e-08
15-150 4.975e-08 2.723e-08
Plot creation:
Thu Feb 11 09:29:56 EST 2021