batgrbproduct analysis for trigger=889785
batgrbproduct Analysis for Trigger=889785
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): Thu Feb 21 05:05:28 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger889785/GCN5_download_cron
======================================================================
Trigger: 00889785 Segment: 000
BAT Trigger Time: 572324397.12 [s; MET]
Trigger Stop: 572324398.144 [s; MET]
UTC: 2019-02-20T02:59:34.673220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 330.142349349267 Dec: -76.6910121240364 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.05
Image Trigger?: NO
Rate S/N Ratio: 14.560219778561 [ if not an image trigger ]
Image S/N Ratio: 9.05
Flight Position: [ source = BAT ]
RA: 330.142349349267 Dec: -76.6910121240364 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 330.128176300005 Dec: -76.6693903580215 [deg; J2000]
{ 22h 00m 30.8s , -76d 40' 09.8" }
+/- 1.26447739290448 [arcmin] (estimated 90% radius based on SNR)
+/- 0.455331207105932 [arcmin] (formal 1-sigma fit error)
SNR: 21.7535999874578
Angular difference between Flight and Ground position is 1.312016 arcmin
Partial Coding Fraction: 0.46875 [ including projection effects ]
Duration
T90: 10 +/- 2
Measured from: -0.119999885559082
to: 9.88000011444092 [s; relative to TRIGTIME]
T50: 4 +/- 1
Measured from: 0.880000114440918
to: 4.88000011444092 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.87999999523163
to: 2.87999999523163 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.120000004768372
to: 11.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.581864 0.746125 0.351132 0.043155
0.040983 0.043995 0.037338 0.032849 [error]
Peak 0.085939 0.149514 0.058818 0.009383
0.011848 0.014851 0.012221 0.009636 [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 2.26e-07 3.02e-07 2.97e-07 5.23e-07 9.96e-07 1.35e-06 erg/cm2
Error 2.37e-08 2.21e-08 3.62e-08 1.25e-07 8.44e-08 1.65e-07 erg/cm2
Peak flux Power-law 1.12e+00 8.89e-01 4.75e-01 3.69e-01 2.65e+00 2.85e+00 ph/cm2/s
Error 2.01e-01 1.18e-01 9.66e-02 1.38e-01 3.51e-01 3.85e-01 ph/cm2/s
Fluence Cutoff-PL 2.03e-07 3.46e-07 2.76e-07 9.08e-08 8.93e-07 9.15e-07 erg/cm2
Error 2.73e-08 3.30e-08 4.73e-08 9.35e-08 9.54e-08 1.33e-07 erg/cm2
Peak flux Cutoff-PL 9.25e-01 1.14e+00 4.66e-01 4.42e-02 2.57e+00 2.58e+00 ph/cm2/s
Error 2.38e-01 1.98e-01 1.37e-01 7.80e-02 3.55e-01 3.59e-01 ph/cm2/s
Fluence Band 1.96e-07 3.53e-07 2.64e-07 2.29e-07 9.15e-07 1.05e-06 erg/cm2
Error 2.91e-08 2.55e-08 4.42e-08 -------- 9.79e-08 -------- erg/cm2
Peak flux Band 8.79e-01 1.19e+00 4.38e-01 1.24e-01 2.58e+00 2.63e+00 ph/cm2/s
Error 2.49e-01 2.07e-01 1.25e-01 1.45e-01 3.54e-01 2.89e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.026 0.134 - - 8.99e-03 8.04e-04 70.000 57
CPL 0.794 0.773 40.3 6.7 4.64e-02 6.38e-02 59.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.905 0.218 - - 1.84e-02 2.94e-03 68.480 57
CPL -0.235 1.643 43.5 8.6 3.20e-01 2.41e+00 59.210 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: 4.032000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.000 -0.120 11.880
T90 10.000 -0.120 9.880
T50 4.000 0.880 4.880
Peak 1.000 1.880 2.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.1282 -76.6694 0.0089 38.2 -143.4 1.6806 21.8 TRIG_00889785
------------------------------------------
Foreground time interval of the image:
-0.120 9.181 (delta_t = 9.301 [sec])
Background time interval of the image:
-239.120 -0.120 (delta_t = 239.000 [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 -0.120 sec. to 11.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02616 ( -0.131364 0.136358 )
Norm@50keV : 8.98834E-03 ( -0.000809615 0.00079869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.00 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.156292e-01
Photon flux (15-150 keV) in 12 sec: 1.36473 ( -0.10086 0.100925 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96199e-07 ( -8.39509e-08 8.49254e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 11.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.793826 ( -0.846903 0.699644 )
Epeak [keV] : 40.2935 ( -6.30733 7.11859 )
Norm@50keV : 4.63656E-02 ( -0.027958 0.0995819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.401814e-01
Photon flux (15-150 keV) in 12 sec: 1.30301 ( -0.10561 0.10604 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.9321e-07 ( -9.25716e-08 9.81792e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 11.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.250511 ( -0.969553 4.18787 )
beta : -2.78644 ( 2.78285 0.566245 )
Epeak [keV] : 37.6314 ( -9.54873 6.35587 )
Norm@50keV : 0.104216 ( -0.104167 117.887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.67 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.767810e-01
Photon flux (15-150 keV) in 12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.14996e-07 ( -9.14912e-07 -9.2154e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.90391 (-0.747145 0.811385)
R^2/D10^2 : 0.669535 (-0.177446 0.239583)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.78 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 57 degrees of freedom
# Null hypothesis probability = 4.873351e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.600e-07 1.872e-08
25- 50 3.923e-07 3.432e-08
50-150 1.991e-07 4.110e-08
15-150 7.513e-07 6.198e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.2172 (-12.008 16.1975)
Norm : 7.07000 (-0.832609 0.900045)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.14 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.297168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.144e-07 2.280e-08
25- 50 3.300e-07 2.484e-08
50-150 3.868e-07 7.350e-08
15-150 9.312e-07 8.838e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.79135 (-1.96231 1.33669)
R1^2/D10^2 : 1.36588 (-0.524081 1.58236)
kT2 [keV] : 24.8107 (-10.9396 51.3536)
R2^2/D10^2 : 9.06125E-03 (-0.00780392 0.0472438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.600410e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.880e-07 4.345e-08
25- 50 3.606e-07 8.544e-08
50-150 3.723e-07 1.721e-07
15-150 9.208e-07 2.812e-07
Peak spectrum fit
Power-law model
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90457 ( -0.20988 0.225401 )
Norm@50keV : 1.84479E-02 ( -0.00296874 0.00290436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.48 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.418894e-01
Photon flux (15-150 keV) in 1 sec: 2.65263 ( -0.351488 0.351501 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69609e-07 ( -2.64855e-08 2.69683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.235174 ( -1.96701 1.31907 )
Epeak [keV] : 43.4716 ( -6.45745 10.7512 )
Norm@50keV : 0.319877 ( -0.322685 4.50225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 56 degrees of freedom
# Null hypothesis probability = 3.592902e-01
Photon flux (15-150 keV) in 1 sec: 2.57204 ( -0.35434 0.35485 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5022e-07 ( -2.5616e-08 2.8016e-08 ) ergs/cm2
Band function
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.25161 ( -2.3565 -1.52228 )
beta : -3.09992 ( 3.06718 0.805865 )
Epeak [keV] : 39.6195 ( -6.90911 12.1445 )
Norm@50keV : 1.43304 ( -1.38487 183.922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.586152e-01
Photon flux (15-150 keV) in 1 sec: 2.58368 ( 4.41632 -0.35419 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56142e-07 ( -1.56135e-07 -2.6868e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6162 (-1.24964 1.41693)
R^2/D10^2 : 1.10740 (-0.4199 0.656339)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.70 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.441442e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.587e-08 5.355e-09
25- 50 6.983e-08 1.176e-08
50-150 4.322e-08 1.296e-08
15-150 1.389e-07 2.455e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.4476 (-22.9751 40.6733)
Norm : 13.1364 (-2.29644 2.7656)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.12 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.689720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.390e-08 6.105e-09
25- 50 5.482e-08 7.590e-09
50-150 7.363e-08 3.815e-08
15-150 1.624e-07 3.410e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.15309 (-9.18826 2.08087)
R1^2/D10^2 : 1.62223 (-1.61637 -1.61637)
kT2 [keV] : 25.3256 (-25.7131 -25.7131)
R2^2/D10^2 : 1.31581E-02 (-0.0127455 0.192347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.22 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.267170e-01
# Null hypothesis probability = 3.575952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.779e-08 8.460e-09
25- 50 6.731e-08 1.653e-08
50-150 4.636e-08 1.587e-08
15-150 1.415e-07 3.244e-08
Plot creation:
Thu Feb 21 05:09:34 EST 2019