batgrbproduct analysis for trigger=824451
batgrbproduct Analysis for Trigger=824451
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 Apr 12 17:15:37 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger824451/GCN5_download_cron
======================================================================
Trigger: 00824451 Segment: 000
BAT Trigger Time: 545142484.48 [s; MET]
Trigger Stop: 545142485.504 [s; MET]
UTC: 2018-04-11T12:27:43.711420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 356.82917852822 Dec: 66.7906613390428 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.13
Image Trigger?: NO
Rate S/N Ratio: 41.3037528561268 [ if not an image trigger ]
Image S/N Ratio: 18.13
Flight Position: [ source = BAT ]
RA: 356.82917852822 Dec: 66.7906613390428 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 356.84020968834 Dec: 66.7902341676739 [deg; J2000]
{ 23h 47m 21.7s , +66d 47' 24.8" }
+/- 0.583120297660089 [arcmin] (estimated 90% radius based on SNR)
+/- 0.135588906165772 [arcmin] (formal 1-sigma fit error)
SNR: 65.7278734704215
Angular difference between Flight and Ground position is 0.262096 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 77.9559998512268 +/- 1.00409571383667
Measured from: -1.19599986076355
to: 76.7599999904633 [s; relative to TRIGTIME]
T50: 47.3880000114441 +/- 1.01256908864099
Measured from: 14.7560000419617
to: 62.1440000534058 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 51.7400000095367
to: 52.7400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.92000007629395
to: 100.832000017166 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.202371 7.225753 5.708333 1.479869
0.064020 0.068467 0.061156 0.048154 [error]
Peak 0.167704 0.266310 0.265057 0.088745
0.007792 0.009385 0.009316 0.006843 [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 1.59e-06 3.00e-06 4.38e-06 1.37e-05 1.24e-05 2.26e-05 erg/cm2
Error 5.63e-08 6.14e-08 7.52e-08 5.66e-07 1.93e-07 5.83e-07 erg/cm2
Peak flux Power-law 1.49e+00 1.89e+00 1.74e+00 2.83e+00 6.08e+00 7.95e+00 ph/cm2/s
Error 1.15e-01 8.72e-02 7.54e-02 2.68e-01 2.37e-01 3.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.53e-06 3.01e-06 4.44e-06 1.18e-05 1.23e-05 2.08e-05 erg/cm2
Error 7.82e-08 6.25e-08 9.20e-08 1.30e-06 2.09e-07 1.51e-06 erg/cm2
Peak flux Cutoff-PL 1.43e+00 1.90e+00 1.78e+00 2.40e+00 6.04e+00 7.51e+00 ph/cm2/s
Error 1.48e-01 9.20e-02 9.15e-02 5.31e-01 2.48e-01 6.37e-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 1.454 0.030 - - 1.20e-02 1.91e-04 39.810 57
CPL 1.330 0.094 326.1 2935.4 1.36e-02 1.55e-03 36.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.114 0.069 - - 5.24e-02 1.98e-03 58.870 57
CPL 0.959 0.237 385.9 0.0 6.14e-02 1.52e-02 57.840 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: 75.840000 sec.
T50 in the 50-300 keV band: 47.168000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 107.752 -6.920 100.832
T90 77.956 -1.196 76.760
T50 47.388 14.756 62.144
Peak 1.000 51.740 52.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.8402 +66.7902 0.0029 19.5 17.9 4.3945 65.7 TRIG_00824451
------------------------------------------
Foreground time interval of the image:
-6.920 10.221 (delta_t = 17.141 [sec])
Background time interval of the image:
-122.379 -6.920 (delta_t = 115.459 [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 -6.920 sec. to 100.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45361 ( -0.0302944 0.0302341 )
Norm@50keV : 1.20466E-02 ( -0.000190852 0.000190693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.81 using 59 PHA bins.
# Reduced chi-squared = 0.6984 for 57 degrees of freedom
# Null hypothesis probability = 9.594218e-01
Photon flux (15-150 keV) in 107.8 sec: 1.48592 ( -0.0282279 0.0283437 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24187e-05 ( -1.9293e-07 1.92944e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.920 sec. to 100.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32978 ( -0.125324 0.0621825 )
Epeak [keV] : 326.101 ( -132.567 5738.21 )
Norm@50keV : 1.35599E-02 ( -0.00141458 0.00168139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.84 using 59 PHA bins.
# Reduced chi-squared = 0.6578 for 56 degrees of freedom
# Null hypothesis probability = 9.776069e-01
Photon flux (15-150 keV) in 107.8 sec: 1.46834 ( -0.03253 0.03277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23418e-05 ( -2.09671e-07 2.09132e-07 ) ergs/cm2
Band function
Time interval is from -6.920 sec. to 100.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.935027 ( -0.434018 3.93143 )
beta : -1.49256 ( 1.49265 0.0464552 )
Epeak [keV] : 81.3652 ( -47.2286 704.378 )
Norm@50keV : 2.34001E-02 ( -0.00975803 0.0890494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.56 using 59 PHA bins.
# Reduced chi-squared = 0.6465 for 55 degrees of freedom
# Null hypothesis probability = 9.806274e-01
Photon flux (15-150 keV) in 107.8 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] : 19.1601 ( )
R^2/D10^2 : 6.97781E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 831.05 using 59 PHA bins.
# Reduced chi-squared = 14.580 for 57 degrees of freedom
# Null hypothesis probability = 6.641117e-138
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.411e-07 1.919e-08
25- 50 2.618e-06 6.522e-08
50-150 7.075e-06 1.709e-07
15-150 1.023e-05 1.757e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.24012 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.61 using 59 PHA bins.
# Reduced chi-squared = 2.0985 for 57 degrees of freedom
# Null hypothesis probability = 2.428889e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.675e-06 3.126e-08
25- 50 3.222e-06 6.199e-08
50-150 7.067e-06 1.315e-07
15-150 1.196e-05 2.156e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.32666 (-0.531702 0.557776)
R1^2/D10^2 : 0.790251 (-0.15323 0.201491)
kT2 [keV] : 31.5732 (-1.92503 2.32632)
R2^2/D10^2 : 1.02138E-02 (-0.0022427 0.00257098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.26 using 59 PHA bins.
# Reduced chi-squared = 0.9501 for 55 degrees of freedom
# Null hypothesis probability = 5.801395e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.265e-06 7.869e-08
25- 50 3.106e-06 1.003e-07
50-150 7.830e-06 2.415e-07
15-150 1.220e-05 2.965e-07
Peak spectrum fit
Power-law model
Time interval is from 51.740 sec. to 52.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11355 ( -0.0687272 0.0685071 )
Norm@50keV : 5.23515E-02 ( -0.00198269 0.00198208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.067245e-01
Photon flux (15-150 keV) in 1 sec: 6.08062 ( -0.236862 0.237091 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45004e-07 ( -2.30216e-08 2.3083e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 51.740 sec. to 52.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.959335 ( -0.27167 0.201906 )
Epeak [keV] : 385.857 ( -385.857 -385.857 )
Norm@50keV : 6.13754E-02 ( -0.0113326 0.0191427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.84 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 56 degrees of freedom
# Null hypothesis probability = 4.072512e-01
Photon flux (15-150 keV) in 1 sec: 6.03577 ( -0.24766 0.24761 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41094e-07 ( -2.4284e-08 2.4175e-08 ) ergs/cm2
Band function
Time interval is from 51.740 sec. to 52.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.959419 ( 0.71142 0.71142 )
beta : -9.86282 ( 8.37556 18.3756 )
Epeak [keV] : 385.995 ( -121.109 -385.995 )
Norm@50keV : 6.13646E-02 ( -0.00231774 0.0154624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.84 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.709418e-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] : 20.7380 ( )
R^2/D10^2 : 0.253790 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 184.25 using 59 PHA bins.
# Reduced chi-squared = 3.2325 for 57 degrees of freedom
# Null hypothesis probability = 2.532198e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.073e-08 1.780e-09
25- 50 1.057e-07 5.535e-09
50-150 3.385e-07 2.365e-08
15-150 4.649e-07 2.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 24.9756 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 171.20 using 59 PHA bins.
# Reduced chi-squared = 3.0035 for 57 degrees of freedom
# Null hypothesis probability = 2.364263e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.219e-08 2.455e-09
25- 50 1.196e-07 5.000e-09
50-150 2.624e-07 1.240e-08
15-150 4.442e-07 1.875e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.69906 (-1.28666 1.47936)
R1^2/D10^2 : 3.36286 (-1.40323 2.84355)
kT2 [keV] : 32.4536 (-3.91345 5.8799)
R2^2/D10^2 : 5.27134E-02 (-0.0218269 0.0280529)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.53 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.143856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.325e-08 7.125e-09
25- 50 1.098e-07 1.238e-08
50-150 3.910e-07 5.025e-08
15-150 5.441e-07 6.075e-08
Plot creation:
Thu Apr 12 17:24:59 EDT 2018