batgrbproduct analysis for trigger=1016881
batgrbproduct Analysis for Trigger=1016881
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): Tue Jan 12 15:46:06 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1016881/batgroup_hand_proc
======================================================================
Trigger: 01016881 Segment: 000
BAT Trigger Time: 632108250.112 [s; MET]
Trigger Stop: 632108251.136 [s; MET]
UTC: 2021-01-12T01:37:03.797420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 218.999082286325 Dec: 33.0702035814177 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.89
Image Trigger?: NO
Rate S/N Ratio: 22.8035085019828 [ if not an image trigger ]
Image S/N Ratio: 10.89
Flight Position: [ source = BAT ]
RA: 218.999082286325 Dec: 33.0702035814177 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 219.005470538799 Dec: 33.0584338735782 [deg; J2000]
{ 14h 36m 01.3s , +33d 03' 30.4" }
+/- 1.18747785810291 [arcmin] (estimated 90% radius based on SNR)
+/- 0.390203567381047 [arcmin] (formal 1-sigma fit error)
SNR: 23.7963579815315
Angular difference between Flight and Ground position is 0.775808 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 107.599999904633 +/- 13.0197710219243
Measured from: 16.4400000572205
to: 124.039999961853 [s; relative to TRIGTIME]
T50: 11.0799999237061 +/- 0.449177024684134
Measured from: 66.2760000228882
to: 77.3559999465942 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 68.8639999628067
to: 69.8639999628067 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.4399999380112
to: 218.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.110645 13.216453 10.791416 2.917142
0.108129 0.116069 0.104330 0.083213 [error]
Peak 0.552069 0.891947 0.830280 0.261876
0.014429 0.017801 0.018158 0.012460 [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 2.96e-06 5.62e-06 8.23e-06 2.58e-05 2.33e-05 4.26e-05 erg/cm2
Error 1.08e-07 1.18e-07 1.31e-07 1.02e-06 3.45e-07 1.03e-06 erg/cm2
Peak flux Power-law 5.56e+00 6.54e+00 5.55e+00 7.98e+00 2.05e+01 2.56e+01 ph/cm2/s
Error 3.29e-01 2.23e-01 1.54e-01 5.21e-01 5.79e-01 6.49e-01 ph/cm2/s
Fluence Cutoff-PL 2.87e-06 5.62e-06 8.32e-06 2.34e-05 2.32e-05 4.02e-05 erg/cm2
Error 1.18e-07 1.19e-07 1.39e-07 3.00e-06 3.76e-07 3.04e-06 erg/cm2
Peak flux Cutoff-PL 5.54e+00 6.53e+00 5.55e+00 7.94e+00 2.05e+01 2.56e+01 ph/cm2/s
Error 3.96e-01 1.91e-01 1.67e-01 9.04e-01 5.97e-01 1.27e+00 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 1.449 0.030 - - 1.06e-02 1.67e-04 26.260 53
CPL 1.357 0.118 447.1 0.0 1.15e-02 1.04e-03 24.830 52
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.237 0.051 - - 1.74e-01 4.44e-03 35.020 53
CPL 1.174 0.138 751.7 0.0 1.84e-01 2.84e-02 35.160 52
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: 99.200000 sec.
T50 in the 50-300 keV band: 8.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 228.912 -10.440 218.472
T90 107.600 16.440 124.040
T50 11.080 66.276 77.356
Peak 1.000 68.864 69.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
219.0055 +33.0584 0.0081 24.3 -1.9 1.7824 23.8 TRIG_01016881
------------------------------------------
Foreground time interval of the image:
-10.440 15.789 (delta_t = 26.229 [sec])
Background time interval of the image:
-239.112 -10.440 (delta_t = 228.672 [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 -10.440 sec. to 218.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44876 ( -0.030232 0.0301935 )
Norm@50keV : 1.06395E-02 ( -0.000167006 0.000166608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.26 using 55 PHA bins.
# Reduced chi-squared = 0.4955 for 53 degrees of freedom
# Null hypothesis probability = 9.992342e-01
Photon flux (15-150 keV) in 228.9 sec: 1.31078 ( -0.025437 0.0255958 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33103e-05 ( -3.44858e-07 3.44868e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.440 sec. to 218.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35733 ( -0.131779 0.10397 )
Epeak [keV] : 447.071 ( -447.076 -447.076 )
Norm@50keV : 1.15444E-02 ( -0.000667316 0.00141111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.83 using 55 PHA bins.
# Reduced chi-squared = 0.4775 for 52 degrees of freedom
# Null hypothesis probability = 9.994948e-01
Photon flux (15-150 keV) in 228.9 sec: 1.29682 ( -0.03131 0.01588 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32057e-05 ( -3.81164e-07 3.70589e-07 ) ergs/cm2
Band function
Time interval is from -10.440 sec. to 218.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.728576 ( 0.87064 5.86307 )
beta : -1.47428 ( 1.47416 0.0414617 )
Epeak [keV] : 66.9767 ( -66.9857 215.299 )
Norm@50keV : 2.71777E-02 ( -0.0158439 715160 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 23.84 using 55 PHA bins.
# Reduced chi-squared = 0.4674 for 51 degrees of freedom
# Null hypothesis probability = 9.995817e-01
Photon flux (15-150 keV) in 228.9 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] : 19.7123 ( )
R^2/D10^2 : 5.58765E-02 ( )
(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 9.635e-07 3.273e-08
25- 50 4.753e-06 1.122e-07
50-150 1.366e-05 2.976e-07
15-150 1.938e-05 3.090e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.51620 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.144e-06 5.608e-08
25- 50 6.048e-06 1.099e-07
50-150 1.326e-05 2.289e-07
15-150 2.246e-05 3.949e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.45922 (-0.498252 0.52079)
R1^2/D10^2 : 0.655124 (-0.118358 0.151685)
kT2 [keV] : 32.3006 (-1.82823 2.18289)
R2^2/D10^2 : 8.40153E-03 (-0.00170679 0.00192982)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.316e-06 1.302e-07
25- 50 5.782e-06 1.602e-07
50-150 1.479e-05 4.029e-07
15-150 2.289e-05 4.898e-07
Peak spectrum fit
Power-law model
Time interval is from 68.864 sec. to 69.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23749 ( -0.0507777 0.050876 )
Norm@50keV : 0.173606 ( -0.00444225 0.00443481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.02 using 55 PHA bins.
# Reduced chi-squared = 0.6607 for 53 degrees of freedom
# Null hypothesis probability = 9.731109e-01
Photon flux (15-150 keV) in 1 sec: 20.4918 ( -0.5777 0.58038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74322e-06 ( -4.60729e-08 4.6163e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 68.864 sec. to 69.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17403 ( -0.204491 0.0717888 )
Epeak [keV] : 751.734 ( -982.957 -982.957 )
Norm@50keV : 0.184138 ( -0.021 0.0357947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.16 using 55 PHA bins.
# Reduced chi-squared = 0.6762 for 52 degrees of freedom
# Null hypothesis probability = 9.645108e-01
Photon flux (15-150 keV) in 1 sec: 20.4706 ( -0.6092 0.5842 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73879e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 68.864 sec. to 69.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07045 ( 0.844133 0.844133 )
beta : -1.25614 ( 1.24991 0.0615283 )
Epeak [keV] : 251.069 ( -244.258 -244.258 )
Norm@50keV : 0.210799 ( -0.0442674 1.0668e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.68 using 55 PHA bins.
# Reduced chi-squared = 0.6799 for 51 degrees of freedom
# Null hypothesis probability = 9.609939e-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] : 19.8346 ( )
R^2/D10^2 : 0.942031 ( )
(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 7.168e-08 3.690e-09
25- 50 3.551e-07 1.240e-08
50-150 1.034e-06 4.335e-08
15-150 1.461e-06 4.600e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 85.3016 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.124e-07 5.650e-09
25- 50 4.086e-07 1.080e-08
50-150 8.961e-07 2.350e-08
15-150 1.517e-06 3.800e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.84396 (-0.941566 1.00448)
R1^2/D10^2 : 8.06429 (-2.1883 3.36536)
kT2 [keV] : 35.8517 (-3.95121 5.68287)
R2^2/D10^2 : 0.113938 (-0.0423261 0.0538438)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.421e-07 1.130e-08
25- 50 3.860e-07 2.055e-08
50-150 1.206e-06 9.400e-08
15-150 1.734e-06 9.550e-08
Plot creation:
Tue Jan 12 18:32:20 EST 2021