batgrbproduct analysis for trigger=945344
batgrbproduct Analysis for Trigger=945344
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 21 17:55:12 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger945344/GCN5_download_cron
======================================================================
Trigger: 00945344 Segment: 000
BAT Trigger Time: 598541401.92 [s; MET]
Trigger Stop: 598541418.304 [s; MET]
UTC: 2019-12-20T13:29:37.799160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 281.390866815625 Dec: 26.6672230199831 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.8
Image Trigger?: NO
Rate S/N Ratio: 8.88819441731559 [ if not an image trigger ]
Image S/N Ratio: 7.8
Flight Position: [ source = BAT ]
RA: 281.390866815625 Dec: 26.6672230199831 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 281.33467574612 Dec: 26.6786275626128 [deg; J2000]
{ 18h 45m 20.3s , +26d 40' 43.1" }
+/- 3.02463860671725 [arcmin] (estimated 90% radius based on SNR)
+/- 1.48125188078937 [arcmin] (formal 1-sigma fit error)
SNR: 6.25809229605352
Angular difference between Flight and Ground position is 3.089417 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 175.552000045776 +/- 125.925491508835
Measured from: -0.383999824523926
to: 175.168000221252 [s; relative to TRIGTIME]
T50: 39.9360001087189 +/- 101.243982493585
Measured from: 7.29600012302399
to: 47.2320002317429 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.69200003147125
to: 7.69200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.46399998664856
to: 248.416000008583 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.811574 0.879986 0.255512 0.193157
0.155676 0.158411 0.135431 0.119866 [error]
Peak 0.059611 0.022792 0.053676 0.018483
0.014918 0.016030 0.013716 0.010973 [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 2.71e-07 3.42e-07 3.14e-07 5.05e-07 1.10e-06 1.43e-06 erg/cm2
Error 7.48e-08 7.56e-08 1.21e-07 3.77e-07 2.87e-07 5.30e-07 erg/cm2
Peak flux Power-law 4.45e-01 3.80e-01 2.22e-01 1.93e-01 1.13e+00 1.24e+00 ph/cm2/s
Error 3.55e-01 1.31e-01 1.18e-01 2.25e-01 3.83e-01 4.15e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-07 4.40e-07 1.88e-07 9.76e-09 8.81e-07 8.81e-07 erg/cm2
Error 8.76e-08 1.23e-07 1.70e-07 2.49e-07 2.85e-07 4.04e-07 erg/cm2
Peak flux Cutoff-PL 4.77e-01 3.82e-01 2.06e-01 1.62e-01 1.14e+00 1.23e+00 ph/cm2/s
Error 2.43e-01 1.27e-01 1.19e-01 2.48e-01 3.87e-01 4.20e-01 ph/cm2/s
Fluence Band 2.39e-07 4.37e-07 2.21e-07 1.15e-07 9.60e-07 1.02e-06 erg/cm2
Error -------- -------- -------- -------- 2.98e-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 2.122 0.397 - - 4.71e-04 1.35e-04 57.150 57
CPL -0.183 3.450 33.7 11.3 1.35e-02 1.23e+01 54.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.776 0.777 - - 8.28e-03 3.35e-03 67.610 57
CPL 3.355 1.273 372.1 0.0 1.54e-03 0.00e+00 66.150 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 250.880 -2.464 248.416
T90 175.552 -0.384 175.168
T50 39.936 7.296 47.232
Peak 1.000 6.692 7.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
281.3347 +26.6786 0.0308 37.6 -105.2 1.7493 6.3 TRIG_00945344
------------------------------------------
Foreground time interval of the image:
-2.464 61.581 (delta_t = 64.045 [sec])
Background time interval of the image:
-239.920 -26.990 (delta_t = 212.930 [sec])
-25.920 -2.464 (delta_t = 23.456 [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 -2.464 sec. to 248.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12158 ( -0.372487 0.421193 )
Norm@50keV : 4.70525E-04 ( -0.000137048 0.000132891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.696767e-01
Photon flux (15-150 keV) in 250.9 sec: 7.48240E-02 ( -0.0159754 0.0159756 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09931e-06 ( -2.79784e-07 2.933e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.464 sec. to 248.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.182920 ( -5.00366 1.89731 )
Epeak [keV] : 33.7065 ( -4.62933 17.9007 )
Norm@50keV : 1.35115E-02 ( -0.0156012 24.589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.38 using 59 PHA bins.
# Reduced chi-squared = 0.9710 for 56 degrees of freedom
# Null hypothesis probability = 5.364721e-01
Photon flux (15-150 keV) in 250.9 sec: 7.02657E-02 ( -0.0155351 0.0164269 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.80712e-07 ( -2.27371e-07 3.43214e-07 ) ergs/cm2
Band function
Time interval is from -2.464 sec. to 248.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.32221 ( -11.6396 -3.93614 )
beta : -3.38008 ( 2.90447 0.913862 )
Epeak [keV] : 32.5752 ( -11.7471 10.4408 )
Norm@50keV : 7.88172E-02 ( -0.0774784 20.7483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 55 degrees of freedom
# Null hypothesis probability = 5.244979e-01
Photon flux (15-150 keV) in 250.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.60448e-07 ( -9.58691e-07 -2.78326e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.59303 (-1.57732 1.95675)
R^2/D10^2 : 6.59938E-02 (-0.0370612 0.0811435)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.50 using 59 PHA bins.
# Reduced chi-squared = 0.9561 for 57 degrees of freedom
# Null hypothesis probability = 5.694659e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.320e-07 9.357e-08
25- 50 4.579e-07 1.820e-07
50-150 1.513e-07 9.129e-08
15-150 8.412e-07 3.420e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.2175 (-19.7539 47.3054)
Norm : 0.440460 (-0.137686 0.211489)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 57 degrees of freedom
# Null hypothesis probability = 5.350476e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.679e-07 8.087e-08
25- 50 3.797e-07 1.266e-07
50-150 3.561e-07 2.208e-07
15-150 1.004e-06 3.392e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 44.2690 (-45.2296 -45.2296)
R1^2/D10^2 : 5.72108E-05 (-5.18263e-05 0.117188)
kT2 [keV] : 7.94403 (-7.97698 2.10862)
R2^2/D10^2 : 8.40856E-02 (-0.0486698 -0.0825255)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9857 for 55 degrees of freedom
# Reduced chi-squared = 0.9673 for 55 degrees of freedom
# Null hypothesis probability = 5.046003e-01
# Null hypothesis probability = 5.436927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.426e-07 4.470e-07
25- 50 4.396e-07 1.265e-06
50-150 2.110e-07 1.879e-06
15-150 8.932e-07 3.052e-06
Peak spectrum fit
Power-law model
Time interval is from 6.692 sec. to 7.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77617 ( -0.722308 0.831786 )
Norm@50keV : 8.27930E-03 ( -0.00364837 0.00305709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.61 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.587019e-01
Photon flux (15-150 keV) in 1 sec: 1.13063 ( -0.383596 0.381632 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6263e-08 ( -3.07246e-08 3.08014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.692 sec. to 7.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.35506 ( -2.12461 0.421675 )
Epeak [keV] : 372.126 ( )
Norm@50keV : 1.53946E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.15 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 56 degrees of freedom
# Null hypothesis probability = 1.662597e-01
Photon flux (15-150 keV) in 1 sec: 1.13797 ( -0.39536 0.37767 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45026e-08 ( -2.87965e-08 3.26924e-08 ) ergs/cm2
Band function
Time interval is from 6.692 sec. to 7.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36141 ( 1.36409 1.36409 )
beta : -1.77703 ( 1.77761 0.723296 )
Epeak [keV] : 23.9819 ( -23.5278 -23.5278 )
Norm@50keV : 2.03501E-02 ( -0.0203863 2.10819e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.61 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 55 degrees of freedom
# Null hypothesis probability = 1.182532e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66897e-08 ( -6.66827e-08 -2.30778e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.35237 (-1.67039 3.13772)
R^2/D10^2 : 5.93378 (-5.93378 26.9977)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.59 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 57 degrees of freedom
# Null hypothesis probability = 6.870773e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.881e-08 1.176e-08
25- 50 1.448e-08 9.825e-09
50-150 8.099e-10 8.030e-10
15-150 3.409e-08 2.238e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.929 (-162.63 -199.063)
Norm : 4.37936 (-1.48537 1.67642)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.82 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.357283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-08 6.815e-09
25- 50 2.098e-08 1.305e-08
50-150 4.597e-08 2.852e-08
15-150 7.786e-08 4.785e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.59028 (-1.60057 1.89042)
R1^2/D10^2 : 10.2300 (-8.15398 57.6152)
kT2 [keV] : 43.4873 (-22.3887 -44.4907)
R2^2/D10^2 : 3.24181E-03 (-0.00300987 0.0168972)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 55 degrees of freedom
# Null hypothesis probability = 2.218559e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.819e-08 1.125e-08
25- 50 1.437e-08 9.305e-09
50-150 5.507e-08 3.456e-08
15-150 8.763e-08 4.573e-08
Plot creation:
Sat Dec 21 17:58:29 EST 2019