batgrbproduct analysis for trigger=820513
batgrbproduct Analysis for Trigger=820513
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 Apr 1 13:06:26 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger820513/GCN5_download_cron
======================================================================
Trigger: 00820513 Segment: 000
BAT Trigger Time: 544203540.032 [s; MET]
Trigger Stop: 544203542.08 [s; MET]
UTC: 2018-03-31T15:38:39.320160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 196.819900496289 Dec: 61.7250399854159 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.48
Image Trigger?: NO
Rate S/N Ratio: 21.6794833886788 [ if not an image trigger ]
Image S/N Ratio: 9.48
Flight Position: [ source = BAT ]
RA: 196.819900496289 Dec: 61.7250399854159 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 196.781468306283 Dec: 61.734959852366 [deg; J2000]
{ 13h 07m 07.6s , +61d 44' 05.9" }
+/- 1.95114365152107 [arcmin] (estimated 90% radius based on SNR)
+/- 0.726786978983352 [arcmin] (formal 1-sigma fit error)
SNR: 11.7062948411511
Angular difference between Flight and Ground position is 1.243804 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 147 +/- 33.0605505096331
Measured from: -21.0319998264313
to: 125.968000173569 [s; relative to TRIGTIME]
T50: 62 +/- 40.7921561087423
Measured from: -7.03199982643127
to: 54.9680001735687 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.968000054359436
to: 1.96800005435944 [s; relative to TRIGTIME]
Total Fluence
Measured from: -22.0319999456406
to: 142.968000054359 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.866799 1.392360 0.647471 0.027130
0.123724 0.127308 0.110259 0.095675 [error]
Peak 0.120145 0.124274 0.067013 0.000542
0.012366 0.012531 0.010245 0.007674 [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 6.23e-07 6.35e-07 4.56e-07 5.23e-07 1.92e-06 2.24e-06 erg/cm2
Error 8.00e-08 6.74e-08 1.01e-07 2.21e-07 2.27e-07 3.54e-07 erg/cm2
Peak flux Power-law 1.27e+00 9.19e-01 4.40e-01 2.97e-01 2.77e+00 2.93e+00 ph/cm2/s
Error 2.00e-01 1.05e-01 8.11e-02 1.01e-01 3.18e-01 3.35e-01 ph/cm2/s
Fluence Cutoff-PL 6.21e-07 6.39e-07 4.53e-07 4.63e-07 1.91e-06 2.18e-06 erg/cm2
Error 8.39e-08 7.80e-08 1.10e-07 3.89e-07 2.49e-07 4.54e-07 erg/cm2
Peak flux Cutoff-PL 1.14e+00 1.06e+00 4.30e-01 7.24e-02 2.69e+00 2.71e+00 ph/cm2/s
Error 2.27e-01 1.50e-01 1.01e-01 1.01e-01 3.23e-01 3.32e-01 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 2.478 0.224 - - 1.17e-03 1.86e-04 37.810 57
CPL 1.993 0.243 0.6 0.4 2.26e-03 0.00e+00 38.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.063 0.200 - - 1.79e-02 2.55e-03 68.910 57
CPL 0.837 1.031 39.0 12.0 9.34e-02 2.27e-01 63.240 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: 5.312000 sec.
T50 in the 50-300 keV band: 2.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 165.000 -22.032 142.968
T90 147.000 -21.032 125.968
T50 62.000 -7.032 54.968
Peak 1.000 0.968 1.968
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
196.7815 +61.7350 0.0164 34.4 -67.6 4.0068 11.7 TRIG_00820513
------------------------------------------
Foreground time interval of the image:
-22.032 142.968 (delta_t = 165.000 [sec])
Background time interval of the image:
-169.831 -22.032 (delta_t = 147.799 [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 -22.032 sec. to 142.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47809 ( -0.214804 0.234169 )
Norm@50keV : 1.16917E-03 ( -0.000188043 0.00018452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.81 using 59 PHA bins.
# Reduced chi-squared = 0.6634 for 57 degrees of freedom
# Null hypothesis probability = 9.764909e-01
Photon flux (15-150 keV) in 165 sec: 0.226631 ( -0.0216636 0.0216713 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91793e-06 ( -2.23367e-07 2.29667e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.032 sec. to 142.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99291 ( -0.482844 0.00399682 )
Epeak [keV] : 0.578918 ( -0.214786 0.569712 )
Norm@50keV : 2.26396E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.57 using 59 PHA bins.
# Reduced chi-squared = 0.6887 for 56 degrees of freedom
# Null hypothesis probability = 9.635226e-01
Photon flux (15-150 keV) in 165 sec: 0.226049 ( -0.022718 0.022075 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90715e-06 ( -2.62324e-07 2.35356e-07 ) ergs/cm2
Band function
Time interval is from -22.032 sec. to 142.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.61173 ( 2.61173 2.61173 )
beta : -2.47809 ( -0.234169 0.215064 )
Epeak [keV] : 19.6324 ( -19.6324 -19.6324 )
Norm@50keV : 0.158907 ( -0.0255576 0.0250788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.81 using 59 PHA bins.
# Reduced chi-squared = 0.6875 for 55 degrees of freedom
# Null hypothesis probability = 9.627711e-01
Photon flux (15-150 keV) in 165 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] : 7.55521 (-0.973704 1.09351)
R^2/D10^2 : 0.292201 (-0.123441 0.227689)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.516229e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.753e-07 7.986e-08
25- 50 7.514e-07 1.096e-07
50-150 1.629e-07 5.725e-08
15-150 1.390e-06 1.869e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.1477 (-8.1727 11.442)
Norm : 1.56695 (-0.31207 0.424024)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.97 using 59 PHA bins.
# Reduced chi-squared = 0.7362 for 57 degrees of freedom
# Null hypothesis probability = 9.320645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.658e-07 7.095e-08
25- 50 7.017e-07 8.555e-08
50-150 4.684e-07 1.584e-07
15-150 1.736e-06 2.257e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.60837 (-0.885388 1.07493)
R1^2/D10^2 : 5.61107 (-3.93972 13.2602)
kT2 [keV] : 13.2354 (-2.7493 4.26974)
R2^2/D10^2 : 2.25261E-02 (-0.0157236 0.0221431)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.99 using 59 PHA bins.
# Reduced chi-squared = 0.6725 for 55 degrees of freedom
# Null hypothesis probability = 9.703400e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.376e-07 2.989e-07
25- 50 6.177e-07 2.897e-07
50-150 5.431e-07 2.867e-07
15-150 1.799e-06 7.385e-07
Peak spectrum fit
Power-law model
Time interval is from 0.968 sec. to 1.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06334 ( -0.194175 0.206432 )
Norm@50keV : 1.79431E-02 ( -0.00257657 0.00252331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.91 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.339652e-01
Photon flux (15-150 keV) in 1 sec: 2.77291 ( -0.317927 0.318029 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66167e-07 ( -2.19208e-08 2.22761e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.968 sec. to 1.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.836796 ( -1.15452 0.907877 )
Epeak [keV] : 39.0170 ( -12.7496 11.199 )
Norm@50keV : 9.34384E-02 ( -0.0934384 0.360305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 56 degrees of freedom
# Null hypothesis probability = 2.361573e-01
Photon flux (15-150 keV) in 1 sec: 2.69335 ( -0.32232 0.32277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52129e-07 ( -2.2273e-08 2.3847e-08 ) ergs/cm2
Band function
Time interval is from 0.968 sec. to 1.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836675 ( -0.663684 1.46217 )
beta : -10.00000 ( 10 3.09769e-07 )
Epeak [keV] : 39.0086 ( -7.56887 11.1836 )
Norm@50keV : 9.34538E-02 ( -0.0934538 0.360831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.083847e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6122e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.80040 (-1.13968 1.29807)
R^2/D10^2 : 1.44505 (-0.560276 0.898291)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.59 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 57 degrees of freedom
# Null hypothesis probability = 7.982850e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.806e-08 5.270e-09
25- 50 6.780e-08 9.315e-09
50-150 3.337e-08 9.790e-09
15-150 1.292e-07 1.775e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.8518 (-15.4093 23.9509)
Norm : 14.8893 (-2.59658 3.03336)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.92 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.466267e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.730e-08 5.555e-09
25- 50 5.643e-08 7.600e-09
50-150 6.318e-08 1.792e-08
15-150 1.569e-07 2.295e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.56304 (-2.23576 2.56567)
R1^2/D10^2 : 7.45871 (-5.07319 44.046)
kT2 [keV] : 15.1843 (-4.04367 10.9483)
R2^2/D10^2 : 0.181328 (-0.166208 0.576553)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.89 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.172492e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.602e-08 1.908e-08
25- 50 5.807e-08 2.903e-08
50-150 5.690e-08 3.401e-08
15-150 1.510e-07 7.720e-08
Plot creation:
Sun Apr 1 13:11:07 EDT 2018