batgrbproduct analysis for trigger=946344
batgrbproduct Analysis for Trigger=946344
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): Sat Dec 28 17:58:31 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger946344/GCN5_download_cron
======================================================================
Trigger: 00946344 Segment: 000
BAT Trigger Time: 599103601.728 [s; MET]
Trigger Stop: 599103602.752 [s; MET]
UTC: 2019-12-27T01:39:37.570780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.169545066939 Dec: -16.7044309198896 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.65
Image Trigger?: NO
Rate S/N Ratio: 76.4983659956211 [ if not an image trigger ]
Image S/N Ratio: 16.65
Flight Position: [ source = BAT ]
RA: 319.169545066939 Dec: -16.7044309198896 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 319.168639169992 Dec: -16.7174994543576 [deg; J2000]
{ 21h 16m 40.5s , -16d 43' 03.0" }
+/- 1.04834639882309 [arcmin] (estimated 90% radius based on SNR)
+/- 0.432988177748961 [arcmin] (formal 1-sigma fit error)
SNR: 28.4332037766717
Angular difference between Flight and Ground position is 0.785838 arcmin
Partial Coding Fraction: 0.1328125 [ including projection effects ]
Duration
T90: 55.9680000543594 +/- 16.2803145247545
Measured from: -13.9839999675751
to: 41.9840000867844 [s; relative to TRIGTIME]
T50: 9.79200005531311 +/- 0.63356769549929
Measured from: 1.45600008964539
to: 11.2480001449585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.26800000667572
to: 6.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.5600000619888
to: 105.919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.797941 11.261466 11.114004 4.662574
0.265387 0.288672 0.274391 0.241789 [error]
Peak 0.435902 0.808902 0.982591 0.401296
0.037186 0.047014 0.052149 0.041255 [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 2.66e-06 5.54e-06 9.02e-06 3.31e-05 2.49e-05 5.03e-05 erg/cm2
Error 1.63e-07 1.99e-07 2.81e-07 2.43e-06 7.19e-07 2.53e-06 erg/cm2
Peak flux Power-law 5.24e+00 6.70e+00 6.24e+00 1.02e+01 2.16e+01 2.84e+01 ph/cm2/s
Error 6.14e-01 4.82e-01 4.03e-01 1.40e+00 1.32e+00 1.78e+00 ph/cm2/s
Fluence Cutoff-PL 2.66e-06 5.54e-06 9.03e-06 3.28e-05 2.49e-05 5.00e-05 erg/cm2
Error 1.81e-07 1.92e-07 2.79e-07 4.39e-06 7.12e-07 3.79e-06 erg/cm2
Peak flux Cutoff-PL 4.87e+00 6.79e+00 6.48e+00 8.02e+00 2.14e+01 2.62e+01 ph/cm2/s
Error 7.73e-01 5.11e-01 5.20e-01 2.43e+00 1.34e+00 3.72e+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 1.296 0.052 - - 1.85e-02 5.28e-04 52.180 57
CPL 1.292 0.110 9998.5 0.0 1.85e-02 1.94e-03 52.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.101 0.100 - - 1.87e-01 1.10e-02 63.280 57
CPL 0.831 0.357 258.7 0.0 2.44e-01 8.93e-02 61.740 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: 35.968000 sec.
T50 in the 50-300 keV band: 8.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 136.480 -30.560 105.920
T90 55.968 -13.984 41.984
T50 9.792 1.456 11.248
Peak 1.000 5.268 6.268
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.1686 -16.7175 0.0067 49.8 -142.0 35.1900 28.4 TRIG_00946344
------------------------------------------
Foreground time interval of the image:
-30.560 105.920 (delta_t = 136.480 [sec])
Background time interval of the image:
-239.728 -35.962 (delta_t = 203.766 [sec])
-34.728 -30.560 (delta_t = 4.168 [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 -30.560 sec. to 105.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29580 ( -0.0525306 0.0522863 )
Norm@50keV : 1.84637E-02 ( -0.000528451 0.000527346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.18 using 59 PHA bins.
# Reduced chi-squared = 0.9155 for 57 degrees of freedom
# Null hypothesis probability = 6.559676e-01
Photon flux (15-150 keV) in 136.5 sec: 2.20107 ( -0.0701989 0.0705553 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49308e-05 ( -7.18267e-07 7.18819e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.560 sec. to 105.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29156 ( -0.145217 0.0747137 )
Epeak [keV] : 9998.51 ( -9998.57 -9998.57 )
Norm@50keV : 1.85414E-02 ( -0.000522566 0.0033567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9321 for 56 degrees of freedom
# Null hypothesis probability = 6.194782e-01
Photon flux (15-150 keV) in 136.5 sec: 2.20155 ( -0.07172 0.06895 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49331e-05 ( -7.05159e-07 7.18399e-07 ) ergs/cm2
Band function
Time interval is from -30.560 sec. to 105.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64052 ( -4.64052 -4.64052 )
beta : -1.30250 ( -0.053476 0.0533938 )
Epeak [keV] : 21.6676 ( -21.6676 4.46526 )
Norm@50keV : 1963.70 ( -54.9086 4.85976e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.80 using 59 PHA bins.
# Reduced chi-squared = 0.9419 for 55 degrees of freedom
# Null hypothesis probability = 5.975693e-01
Photon flux (15-150 keV) in 136.5 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] : 20.5282 ( )
R^2/D10^2 : 8.79915E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 341.97 using 59 PHA bins.
# Reduced chi-squared = 5.9994 for 57 degrees of freedom
# Null hypothesis probability = 2.925528e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.655e-07 5.760e-08
25- 50 4.892e-06 2.198e-07
50-150 1.533e-05 6.484e-07
15-150 2.119e-05 6.961e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 9.45828 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 148.62 using 59 PHA bins.
# Reduced chi-squared = 2.6074 for 57 degrees of freedom
# Null hypothesis probability = 4.150297e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.215e-06 1.037e-07
25- 50 6.184e-06 1.972e-07
50-150 1.356e-05 4.464e-07
15-150 2.296e-05 7.712e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.23800 (-0.847842 0.923631)
R1^2/D10^2 : 1.19498 (-0.352325 0.541887)
kT2 [keV] : 35.0153 (-3.51068 4.78715)
R2^2/D10^2 : 1.27805E-02 (-0.00427627 0.00537356)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.13 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.321854e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.347e-06 2.744e-07
25- 50 5.742e-06 3.815e-07
50-150 1.697e-05 1.317e-06
15-150 2.506e-05 1.829e-06
Peak spectrum fit
Power-law model
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10116 ( -0.100053 0.0995377 )
Norm@50keV : 0.186530 ( -0.0110107 0.0109946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.28 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.642829e-01
Photon flux (15-150 keV) in 1 sec: 21.6385 ( -1.31608 1.31795 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94951e-06 ( -1.23898e-07 1.24109e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.831491 ( -0.400972 0.312418 )
Epeak [keV] : 258.703 ( -258.703 -258.703 )
Norm@50keV : 0.244377 ( -0.0640445 0.114612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.785277e-01
Photon flux (15-150 keV) in 1 sec: 21.4459 ( -1.3401 1.3425 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94042e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92464 ( -4.92464 -4.92464 )
beta : -1.13657 ( -0.108795 0.106054 )
Epeak [keV] : 25.4314 ( -25.4314 4.55201 )
Norm@50keV : 1.09494E+04 ( -640.414 3.42778e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.584599e-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] : 22.3374 ( )
R^2/D10^2 : 0.733599 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.44 using 59 PHA bins.
# Reduced chi-squared = 2.0252 for 57 degrees of freedom
# Null hypothesis probability = 7.587497e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.727e-08 8.275e-09
25- 50 3.589e-07 3.090e-08
50-150 1.338e-06 1.255e-07
15-150 1.764e-06 1.370e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 89.1915 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.46 using 59 PHA bins.
# Reduced chi-squared = 2.0959 for 57 degrees of freedom
# Null hypothesis probability = 2.531390e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.221e-07 1.520e-08
25- 50 4.272e-07 3.135e-08
50-150 9.370e-07 1.946e-07
15-150 1.586e-06 2.565e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.90222 (-1.45789 1.85366)
R1^2/D10^2 : 16.8636 (-9.26052 23.5468)
kT2 [keV] : 31.0725 (-3.88945 5.74463)
R2^2/D10^2 : 0.226905 (-0.0971509 0.127616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.04 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.640603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.607e-07 4.677e-08
25- 50 3.792e-07 7.455e-08
50-150 1.437e-06 2.410e-07
15-150 1.977e-06 3.085e-07
Plot creation:
Sat Dec 28 18:04:40 EST 2019