batgrbproduct analysis for trigger=1085430
batgrbproduct Analysis for Trigger=1085430
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 Nov 29 19:16:00 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1085430/batgroup_hand_proc
======================================================================
Trigger: 01085430 Segment: 000
BAT Trigger Time: 659872294.4 [s; MET]
Trigger Stop: 659872295.424 [s; MET]
UTC: 2021-11-29T09:51:06.232980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.556946141108 Dec: 31.7759512305881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.2
Image Trigger?: NO
Rate S/N Ratio: 21.1660104885167 [ if not an image trigger ]
Image S/N Ratio: 9.2
Flight Position: [ source = BAT ]
RA: 274.556946141108 Dec: 31.7759512305881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.565036189555 Dec: 31.7809596463099 [deg; J2000]
{ 18h 18m 15.6s , +31d 46' 51.5" }
+/- 1.45132743452823 [arcmin] (estimated 90% radius based on SNR)
+/- 0.547771066422974 [arcmin] (formal 1-sigma fit error)
SNR: 17.8659018803062
Angular difference between Flight and Ground position is 0.510463 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 113.011999964714 +/- 9.14061251826029
Measured from: 0.131999969482422
to: 113.143999934196 [s; relative to TRIGTIME]
T50: 79.8079999685287 +/- 5.73612839198368
Measured from: 10.0240000486374
to: 89.8320000171661 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.98800003528595
to: 1.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.80400002002716
to: 124.111999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.328516 1.539593 0.911475 0.267140
0.086871 0.090036 0.079638 0.074078 [error]
Peak 0.056702 0.074204 0.054381 0.023293
0.009023 0.009822 0.008497 0.007318 [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 4.03e-07 6.36e-07 7.55e-07 1.74e-06 2.30e-06 3.54e-06 erg/cm2
Error 4.39e-08 4.32e-08 8.06e-08 3.88e-07 1.85e-07 4.60e-07 erg/cm2
Peak flux Power-law 5.17e-01 5.11e-01 3.53e-01 3.85e-01 1.54e+00 1.77e+00 ph/cm2/s
Error 1.20e-01 7.77e-02 6.88e-02 1.47e-01 2.27e-01 2.68e-01 ph/cm2/s
Fluence Cutoff-PL 4.03e-07 6.37e-07 7.55e-07 1.59e-06 2.30e-06 3.36e-06 erg/cm2
Error 4.53e-08 4.61e-08 8.06e-08 6.28e-07 1.99e-07 7.38e-07 erg/cm2
Peak flux Cutoff-PL 4.55e-01 5.81e-01 3.62e-01 1.08e-01 1.48e+00 1.51e+00 ph/cm2/s
Error 1.39e-01 1.09e-01 8.33e-02 1.98e-01 2.35e-01 2.87e-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 1.752 0.130 - - 1.98e-03 1.52e-04 53.020 57
CPL 1.751 0.458 9997.1 -0.0 1.98e-03 1.22e-03 53.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.532 0.243 - - 1.22e-02 1.90e-03 89.840 57
CPL 0.415 1.316 63.0 476.6 5.08e-02 1.71e-01 87.050 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: 108.800000 sec.
T50 in the 50-300 keV band: 86.592000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 125.916 -1.804 124.112
T90 113.012 0.132 113.144
T50 79.808 10.024 89.832
Peak 1.000 0.988 1.988
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.5650 +31.7810 0.0108 21.7 -39.3 1.2432 17.9 TRIG_01085430
------------------------------------------
Foreground time interval of the image:
-1.804 14.301 (delta_t = 16.105 [sec])
Background time interval of the image:
-138.899 -1.804 (delta_t = 137.095 [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 -1.804 sec. to 124.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75188 ( -0.12859 0.130878 )
Norm@50keV : 1.98042E-03 ( -0.000153134 0.000151181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9302 for 57 degrees of freedom
# Null hypothesis probability = 6.251244e-01
Photon flux (15-150 keV) in 125.9 sec: 0.267972 ( -0.0183449 0.0183628 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30047e-06 ( -1.84027e-07 1.86335e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.804 sec. to 124.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75077 ( -0.429972 0.486575 )
Epeak [keV] : 9997.12 ( -9997.83 -9997.84 )
Norm@50keV : 1.98337E-03 ( -0.000901025 0.00153751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9468 for 56 degrees of freedom
# Null hypothesis probability = 5.883709e-01
Photon flux (15-150 keV) in 125.9 sec: 0.267906 ( -0.018673 0.018315 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29906e-06 ( -2.12972e-07 1.85703e-07 ) ergs/cm2
Band function
Time interval is from -1.804 sec. to 124.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.19754 ( -3.58463 -3.58463 )
beta : -1.81398 ( -0.180024 0.155149 )
Epeak [keV] : 21.8782 ( -22.3353 67.6383 )
Norm@50keV : 140.022 ( -140.034 4296.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.07 using 59 PHA bins.
# Reduced chi-squared = 0.9286 for 55 degrees of freedom
# Null hypothesis probability = 6.253619e-01
Photon flux (15-150 keV) in 125.9 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] : 11.3091 ( )
R^2/D10^2 : 7.71871E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 114.82 using 59 PHA bins.
# Reduced chi-squared = 2.0143 for 57 degrees of freedom
# Null hypothesis probability = 8.960910e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.610e-07 3.431e-08
25- 50 7.644e-07 6.339e-08
50-150 5.638e-07 9.776e-08
15-150 1.589e-06 1.435e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 115.903 (-30.893 49.3959)
Norm : 1.13680 (-0.100596 0.124564)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.733e-07 3.689e-08
25- 50 6.637e-07 5.949e-08
50-150 1.164e-06 4.123e-07
15-150 2.201e-06 4.451e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54234 (-1.02146 1.12924)
R1^2/D10^2 : 0.448981 (-0.192956 0.385063)
kT2 [keV] : 27.9839 (-6.47924 12.5871)
R2^2/D10^2 : 2.24759E-03 (-0.00154125 0.0034333)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.965e-07 7.006e-08
25- 50 6.477e-07 1.303e-07
50-150 1.282e-06 5.824e-07
15-150 2.326e-06 7.084e-07
Peak spectrum fit
Power-law model
Time interval is from 0.988 sec. to 1.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53186 ( -0.240811 0.244541 )
Norm@50keV : 1.21888E-02 ( -0.00190557 0.00188458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.84 using 59 PHA bins.
# Reduced chi-squared = 1.576 for 57 degrees of freedom
# Null hypothesis probability = 3.598040e-03
Photon flux (15-150 keV) in 1 sec: 1.53506 ( -0.227284 0.227433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15052e-07 ( -1.93919e-08 1.97672e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.988 sec. to 1.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.415425 ( -1.50051 1.13116 )
Epeak [keV] : 63.0097 ( -16.4722 936.676 )
Norm@50keV : 5.07862E-02 ( -0.0508395 0.290405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.05 using 59 PHA bins.
# Reduced chi-squared = 1.554 for 56 degrees of freedom
# Null hypothesis probability = 4.944668e-03
Photon flux (15-150 keV) in 1 sec: 1.47991 ( -0.23483 0.23497 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02953e-07 ( -2.12631e-08 2.3184e-08 ) ergs/cm2
Band function
Time interval is from 0.988 sec. to 1.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99161 ( -14.8736 -4.99161 )
beta : -1.75137 ( -0.469225 0.303075 )
Epeak [keV] : 26.4516 ( -6.72672 6.85336 )
Norm@50keV : 999.972 ( -144.436 5193.97 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.26 using 59 PHA bins.
# Reduced chi-squared = 1.550 for 55 degrees of freedom
# Null hypothesis probability = 5.524520e-03
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06114e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9887 (-1.99417 2.42959)
R^2/D10^2 : 0.298785 (-0.138114 0.245011)
(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 1.069e-08 3.027e-09
25- 50 3.679e-08 7.825e-09
50-150 3.921e-08 1.289e-08
15-150 8.669e-08 2.005e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 185.907 (-92.4785 -184.196)
Norm : 6.32608 (-0.943401 1.13075)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.589e-08 8.880e-09
25- 50 3.032e-08 1.648e-08
50-150 6.493e-08 3.568e-08
15-150 1.111e-07 6.150e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 197.410 (-197.497 -197.497)
R1^2/D10^2 : 1.41739E-04 (-9.68531e-05 0.196319)
kT2 [keV] : 10.9434 (-6.75517 2.34972)
R2^2/D10^2 : 0.495359 (-0.23475 3.03328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.447e-08 7.990e-09
25- 50 3.345e-08 1.740e-08
50-150 5.468e-08 3.142e-08
15-150 1.026e-07 5.185e-08
Plot creation:
Mon Nov 29 19:44:54 EST 2021