batgrbproduct analysis for trigger=930285
batgrbproduct Analysis for Trigger=930285
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): Sun Oct 20 16:54:25 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger930285/GCN5_download_cron
======================================================================
Trigger: 00930285 Segment: 000
BAT Trigger Time: 593190777.408 [s; MET]
Trigger Stop: 593190777.664 [s; MET]
UTC: 2019-10-19T15:12:33.632500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 340.038362226781 Dec: -17.3332351323859 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.94
Image Trigger?: NO
Rate S/N Ratio: 24.1867732448956 [ if not an image trigger ]
Image S/N Ratio: 10.94
Flight Position: [ source = BAT ]
RA: 340.038362226781 Dec: -17.3332351323859 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 340.034686274198 Dec: -17.3399772067488 [deg; J2000]
{ 22h 40m 08.3s , -17d 20' 23.9" }
+/- 0.638619253186371 [arcmin] (estimated 90% radius based on SNR)
+/- 0.19885171739305 [arcmin] (formal 1-sigma fit error)
SNR: 57.7223605818087
Angular difference between Flight and Ground position is 0.456033 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 64.3479999303818 +/- 4.44569583084912
Measured from: 1.34000015258789
to: 65.6880000829697 [s; relative to TRIGTIME]
T50: 30.4719998836517 +/- 1.03064250738057
Measured from: 10.2080001831055
to: 40.6800000667572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.136000037193298
to: 0.863999962806702 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.827999949455261
to: 84.2840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.164388 7.309929 3.428293 0.747444
0.111672 0.115043 0.098038 0.088393 [error]
Peak 0.184273 0.248431 0.163178 0.004639
0.014426 0.015550 0.013349 0.010271 [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 2.87e-06 3.34e-06 2.80e-06 3.97e-06 1.04e-05 1.30e-05 erg/cm2
Error 1.34e-07 8.69e-08 1.06e-07 3.27e-07 2.59e-07 4.09e-07 erg/cm2
Peak flux Power-law 2.37e+00 1.91e+00 1.04e+00 8.32e-01 5.70e+00 6.16e+00 ph/cm2/s
Error 2.69e-01 1.42e-01 1.08e-01 1.66e-01 4.29e-01 4.51e-01 ph/cm2/s
Fluence Cutoff-PL 2.74e-06 3.39e-06 2.81e-06 2.87e-06 1.02e-05 1.18e-05 erg/cm2
Error 1.73e-07 9.76e-08 1.10e-07 8.54e-07 3.25e-07 9.30e-07 erg/cm2
Peak flux Cutoff-PL 1.99e+00 2.12e+00 1.12e+00 3.12e-01 5.47e+00 5.55e+00 ph/cm2/s
Error 3.22e-01 1.82e-01 1.28e-01 1.65e-01 4.44e-01 4.76e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.05e+00 2.10e+00 1.13e+00 3.70e-01 5.53e+00 5.64e+00 ph/cm2/s
Error 3.19e-01 1.89e-01 -------- 1.54e-01 4.52e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.254 0.053 - - 1.29e-02 3.50e-04 57.850 57
CPL 1.990 -0.902 1.8 10.2 1.75e-02 9.20e-04 54.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.876 0.125 - - 4.01e-02 3.25e-03 48.550 57
CPL 0.805 0.598 53.5 9.6 1.45e-01 1.17e-01 36.780 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: 52.672000 sec.
T50 in the 50-300 keV band: 28.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 85.112 -0.828 84.284
T90 64.348 1.340 65.688
T50 30.472 10.208 40.680
Peak 1.000 -0.136 0.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
340.0347 -17.3400 0.0033 44.5 -170.5 18.9047 57.7 TRIG_00930285
------------------------------------------
Foreground time interval of the image:
-0.828 84.284 (delta_t = 85.112 [sec])
Background time interval of the image:
-239.408 -0.828 (delta_t = 238.580 [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 -0.828 sec. to 84.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25424 ( -0.0525001 0.052976 )
Norm@50keV : 1.29409E-02 ( -0.000350417 0.000349117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.436176e-01
Photon flux (15-150 keV) in 85.11 sec: 2.20538 ( -0.0668554 0.0673626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04415e-05 ( -2.5932e-07 2.5937e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.828 sec. to 84.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99028 ( -0.187012 -1.99028 )
Epeak [keV] : 1.79055 ( -0.315167 20.0543 )
Norm@50keV : 1.75342E-02 ( -0.000836579 0.00100267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
# Reduced chi-squared = 0.9731 for 56 degrees of freedom
# Null hypothesis probability = 5.320447e-01
Photon flux (15-150 keV) in 85.11 sec: 2.15533 ( -0.07948 0.08021 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0227e-05 ( -3.25376e-07 3.24439e-07 ) ergs/cm2
Band function
Time interval is from -0.828 sec. to 84.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59315 ( -0.336716 1.5911 )
beta : -2.36597 ( -0.130164 0.110337 )
Epeak [keV] : 23.5993 ( -13.4052 6.67903 )
Norm@50keV : 3.11781E-02 ( -0.0116343 2002.05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.67 using 59 PHA bins.
# Reduced chi-squared = 0.9394 for 55 degrees of freedom
# Null hypothesis probability = 6.027912e-01
Photon flux (15-150 keV) in 85.11 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] : 10.8816 ( )
R^2/D10^2 : 0.628038 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 406.30 using 59 PHA bins.
# Reduced chi-squared = 7.1281 for 57 degrees of freedom
# Null hypothesis probability = 3.482030e-54
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.319e-06 6.596e-08
25- 50 3.679e-06 1.055e-07
50-150 2.440e-06 1.506e-07
15-150 7.439e-06 2.051e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3949 (-3.91166 4.31014)
Norm : 11.0399 (-0.587525 0.499483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.34 using 59 PHA bins.
# Reduced chi-squared = 1.374 for 57 degrees of freedom
# Null hypothesis probability = 3.191730e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.336e-06 9.830e-08
25- 50 3.487e-06 1.017e-07
50-150 3.764e-06 1.732e-07
15-150 9.587e-06 2.511e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.35557 (-0.495695 0.507424)
R1^2/D10^2 : 4.23444 (-1.08532 1.62186)
kT2 [keV] : 21.2276 (-2.03228 2.5426)
R2^2/D10^2 : 2.99204E-02 (-0.0111042 0.015942)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 55 degrees of freedom
# Null hypothesis probability = 1.446205e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.307e-06 2.102e-07
25- 50 3.475e-06 1.664e-07
50-150 4.025e-06 3.813e-07
15-150 9.807e-06 4.894e-07
Peak spectrum fit
Power-law model
Time interval is from -0.136 sec. to 0.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87551 ( -0.123274 0.127377 )
Norm@50keV : 4.01326E-02 ( -0.00326711 0.00323521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.55 using 59 PHA bins.
# Reduced chi-squared = 0.8517 for 57 degrees of freedom
# Null hypothesis probability = 7.796717e-01
Photon flux (15-150 keV) in 1 sec: 5.70049 ( -0.429028 0.429659 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6894e-07 ( -2.98258e-08 2.99991e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.136 sec. to 0.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.805429 ( -0.636209 0.559366 )
Epeak [keV] : 53.5423 ( -7.37717 11.8561 )
Norm@50keV : 0.145281 ( -0.0700998 0.164788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.78 using 59 PHA bins.
# Reduced chi-squared = 0.6567 for 56 degrees of freedom
# Null hypothesis probability = 9.780139e-01
Photon flux (15-150 keV) in 1 sec: 5.46751 ( -0.44337 0.44461 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49075e-07 ( -3.1357e-08 3.1737e-08 ) ergs/cm2
Band function
Time interval is from -0.136 sec. to 0.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.805371 ( -0.405215 0.94156 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 53.5316 ( -7.37795 13.9747 )
Norm@50keV : 0.145289 ( -0.070143 0.164955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.78 using 59 PHA bins.
# Reduced chi-squared = 0.6687 for 55 degrees of freedom
# Null hypothesis probability = 9.720872e-01
Photon flux (15-150 keV) in 1 sec: 5.53335 ( 1.46665 -0.50426 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49381e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3579 (-0.996287 1.07804)
R^2/D10^2 : 1.25201 (-0.338317 0.462379)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.78 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.788113e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.052e-08 5.415e-09
25- 50 1.319e-07 1.200e-08
50-150 1.235e-07 1.865e-08
15-150 2.959e-07 2.535e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.3992 (-18.2083 26.2998)
Norm : 26.0920 (-2.54662 3.01081)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.94 using 59 PHA bins.
# Reduced chi-squared = 0.6831 for 57 degrees of freedom
# Null hypothesis probability = 9.677677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.807e-08 7.705e-09
25- 50 1.149e-07 8.850e-09
50-150 1.743e-07 5.745e-08
15-150 3.574e-07 5.975e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.07139 (-1.93625 2.00422)
R1^2/D10^2 : 9.33758 (-5.57685 31.1126)
kT2 [keV] : 17.8674 (-2.99054 4.91708)
R2^2/D10^2 : 0.237259 (-0.15918 0.216302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.72 using 59 PHA bins.
# Reduced chi-squared = 0.6676 for 55 degrees of freedom
# Null hypothesis probability = 9.725551e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.171e-08 2.740e-08
25- 50 1.175e-07 4.650e-08
50-150 1.663e-07 7.065e-08
15-150 3.455e-07 1.354e-07
Plot creation:
Sun Oct 20 17:01:46 EDT 2019