batgrbproduct analysis for trigger=883012
batgrbproduct Analysis for Trigger=883012
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 v2.46
Process Start Time (local time): Fri Jan 11 11:07:15 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger883012/batgroup_hand_proc
======================================================================
Trigger: 00883012 Segment: 000
BAT Trigger Time: 568833910.528 [s; MET]
Trigger Stop: 568833911.04 [s; MET]
UTC: 2019-01-10T17:24:48.300500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.881511087457 Dec: -53.6765232636808 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.06
Image Trigger?: NO
Rate S/N Ratio: 14.7309198626562 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 276.881511087457 Dec: -53.6765232636808 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.938656069169 Dec: -53.6428732089964 [deg; J2000]
{ 18h 27m 45.3s , -53d 38' 34.3" }
+/- 0.800895006752728 [arcmin] (estimated 90% radius based on SNR)
+/- 0.275006894905719 [arcmin] (formal 1-sigma fit error)
SNR: 41.7702950340526
Angular difference between Flight and Ground position is 2.864349 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 9.30799996852875 +/- 0.812905859293255
Measured from: 0.175999999046326
to: 9.48399996757507 [s; relative to TRIGTIME]
T50: 3.31199991703033 +/- 0.300612676026064
Measured from: 2.5
to: 5.81199991703033 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.6599999666214
to: 5.6599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.796000003814697
to: 10.9960000514984 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.083083 1.504052 1.043710 0.221716
0.052582 0.047295 0.040508 0.029413 [error]
Peak 0.236873 0.410971 0.299637 0.096029
0.018533 0.019361 0.017386 0.011655 [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 3.95e-07 6.57e-07 8.30e-07 2.09e-06 2.47e-06 3.98e-06 erg/cm2
Error 2.77e-08 2.73e-08 4.08e-08 2.26e-07 9.87e-08 2.53e-07 erg/cm2
Peak flux Power-law 2.83e+00 2.96e+00 2.19e+00 2.61e+00 8.97e+00 1.06e+01 ph/cm2/s
Error 2.88e-01 1.83e-01 1.42e-01 3.54e-01 5.14e-01 5.78e-01 ph/cm2/s
Fluence Cutoff-PL 3.71e-07 6.74e-07 8.49e-07 1.37e-06 2.42e-06 3.27e-06 erg/cm2
Error 3.44e-08 3.11e-08 4.48e-08 5.10e-07 1.09e-07 5.17e-07 erg/cm2
Peak flux Cutoff-PL 2.78e+00 2.98e+00 2.20e+00 2.39e+00 8.94e+00 1.04e+01 ph/cm2/s
Error 3.33e-01 2.01e-01 1.61e-01 6.71e-01 5.29e-01 8.58e-01 ph/cm2/s
Fluence Band 3.56e-07 6.85e-07 8.26e-07 1.82e-06 2.41e-06 3.69e-06 erg/cm2
Error -------- -------- -------- -------- 1.08e-07 -------- 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 1.663 0.070 - - 2.25e-02 8.65e-04 61.440 57
CPL 1.354 0.281 108.7 177.3 3.18e-02 9.96e-03 57.650 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.435 0.095 - - 7.31e-02 3.98e-03 49.860 57
CPL 1.359 0.251 446.2 0.0 7.96e-02 2.84e-02 49.720 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: 5.696000 sec.
T50 in the 50-300 keV band: 2.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.792 -0.796 10.996
T90 9.308 0.176 9.484
T50 3.312 2.500 5.812
Peak 1.000 4.660 5.660
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.9387 -53.6429 0.0046 35.1690 -48.9789 4.3344797 41.770 TRIG_00883012
Foreground time interval of the image:
-0.796 10.996 (delta_t = 11.792 [sec])
Background time interval of the image:
-239.528 -0.796 (delta_t = 238.732 [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 -0.796 sec. to 10.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66333 ( -0.069417 0.0696972 )
Norm@50keV : 2.25199E-02 ( -0.000865719 0.000864836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.199465e-01
Photon flux (15-150 keV) in 11.79 sec: 2.95361 ( -0.122436 0.122837 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46614e-06 ( -9.86258e-08 9.88092e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.796 sec. to 10.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35404 ( -0.290732 0.272164 )
Epeak [keV] : 108.676 ( -29.5325 325.088 )
Norm@50keV : 3.17840E-02 ( -0.00812148 0.0118063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.65 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.140634e-01
Photon flux (15-150 keV) in 11.79 sec: 2.89403 ( -0.13217 0.13256 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41552e-06 ( -1.0934e-07 1.08845e-07 ) ergs/cm2
Band function
Time interval is from -0.796 sec. to 10.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01272 ( -0.48715 0.988667 )
beta : -1.80995 ( 1.80244 0.174225 )
Epeak [keV] : 63.6588 ( -30.0291 152.271 )
Norm@50keV : 5.13659E-02 ( -0.0314018 546.144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.54 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.172495e-01
Photon flux (15-150 keV) in 11.79 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41286e-06 ( -2.41278e-06 -1.10166e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6603 ( )
R^2/D10^2 : 0.339701 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 203.98 using 59 PHA bins.
# Reduced chi-squared = 3.5785 for 57 degrees of freedom
# Null hypothesis probability = 2.080165e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.808e-07 1.497e-08
25- 50 7.034e-07 3.443e-08
50-150 1.018e-06 8.011e-08
15-150 1.902e-06 8.548e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.311 (-29.8591 33.9505)
Norm : 11.9605 (-0.533851 0.660676)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.462892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.598e-07 2.387e-08
25- 50 6.738e-07 4.799e-08
50-150 1.369e-06 3.740e-07
15-150 2.403e-06 4.144e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.32833 (-1.04134 1.15866)
R1^2/D10^2 : 2.73942 (-1.02986 1.91823)
kT2 [keV] : 25.9762 (-3.58573 5.55975)
R2^2/D10^2 : 3.28394E-02 (-0.016614 0.0253412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.161157e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.360e-07 4.575e-08
25- 50 6.927e-07 6.048e-08
50-150 1.363e-06 2.297e-07
15-150 2.392e-06 2.588e-07
Peak spectrum fit
Power-law model
Time interval is from 4.660 sec. to 5.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43532 ( -0.0950117 0.0949711 )
Norm@50keV : 7.30756E-02 ( -0.00398156 0.00397875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.86 using 59 PHA bins.
# Reduced chi-squared = 0.8747 for 57 degrees of freedom
# Null hypothesis probability = 7.376700e-01
Photon flux (15-150 keV) in 1 sec: 8.97322 ( -0.51346 0.51438 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01203e-07 ( -4.11667e-08 4.1278e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.660 sec. to 5.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35936 ( -0.366307 0.136134 )
Epeak [keV] : 446.180 ( -446.232 -446.232 )
Norm@50keV : 7.95691E-02 ( -0.0176522 0.0391085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.72 using 59 PHA bins.
# Reduced chi-squared = 0.8878 for 56 degrees of freedom
# Null hypothesis probability = 7.101662e-01
Photon flux (15-150 keV) in 1 sec: 8.94330 ( -0.52902 0.52951 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98566e-07 ( -4.3643e-08 4.3137e-08 ) ergs/cm2
Band function
Time interval is from 4.660 sec. to 5.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.399665 ( -2.13308 4.30941 )
beta : -1.53124 ( -0.1954 0.134586 )
Epeak [keV] : 40.3474 ( -16.6936 92.9854 )
Norm@50keV : 1.19566 ( -1.27972 1826.93 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.69 using 59 PHA bins.
# Reduced chi-squared = 0.8489 for 55 degrees of freedom
# Null hypothesis probability = 7.798756e-01
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] : 15.7115 ( )
R^2/D10^2 : 0.868391 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.38 using 59 PHA bins.
# Reduced chi-squared = 2.4452 for 57 degrees of freedom
# Null hypothesis probability = 7.493105e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.450e-08 4.905e-09
25- 50 1.843e-07 1.360e-08
50-150 3.158e-07 3.230e-08
15-150 5.446e-07 3.540e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.3018 -200)
Norm : 37.2060 (-2.02555 2.02555)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9785 for 57 degrees of freedom
# Null hypothesis probability = 5.211258e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.265e-08 5.890e-09
25- 50 1.782e-07 1.105e-08
50-150 3.909e-07 2.555e-08
15-150 6.617e-07 7.275e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.09280 (-1.21759 1.28479)
R1^2/D10^2 : 4.27662 (-1.44887 2.47581)
kT2 [keV] : 42.1490 (-10.0377 22.7429)
R2^2/D10^2 : 2.47066E-02 (-0.0167346 0.0332375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.12 using 59 PHA bins.
# Reduced chi-squared = 0.7840 for 55 degrees of freedom
# Null hypothesis probability = 8.773262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.465e-08 1.122e-08
25- 50 1.872e-07 2.840e-08
50-150 4.431e-07 1.832e-07
15-150 7.049e-07 2.017e-07
Plot creation:
Fri Jan 11 11:17:34 EST 2019