batgrbproduct analysis for trigger=742866
batgrbproduct Analysis for Trigger=742866
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): Fri Mar 17 23:17:32 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger742866/GCN5_download_cron
======================================================================
Trigger: 00742866 Segment: 000
BAT Trigger Time: 511436777.856 [s; MET]
Trigger Stop: 511436778.88 [s; MET]
UTC: 2017-03-17T09:45:59.089020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 93.0878746012199 Dec: 50.5203503865234 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 93.0878746012199 Dec: 50.5203503865234 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 93.087293198964 Dec: 50.5001501163684 [deg; J2000]
{ 06h 12m 21.0s , +50d 30' 00.5" }
+/- 0.976158237697783 [arcmin] (estimated 90% radius based on SNR)
+/- 0.347955597367222 [arcmin] (formal 1-sigma fit error)
SNR: 31.4839699443792
Angular difference between Flight and Ground position is 1.212219 arcmin
Partial Coding Fraction: 0.4609375 [ including projection effects ]
Duration
T90: 11.9360000491142 +/- 4.87496131951583
Measured from: 0.43200010061264
to: 12.3680001497269 [s; relative to TRIGTIME]
T50: 4.2720000743866 +/- 0.745160363581561
Measured from: 1.98400008678436
to: 6.25600016117096 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.283999979496
to: 2.283999979496 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.287999987602234
to: 18.2879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.657193 0.968923 0.592492 0.114680
0.045878 0.047837 0.040575 0.033118 [error]
Peak 0.108625 0.151580 0.121284 0.039233
0.011789 0.013504 0.011348 0.008645 [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 2.57e-07 3.99e-07 4.67e-07 1.05e-06 1.43e-06 2.17e-06 erg/cm2
Error 2.46e-08 2.45e-08 3.98e-08 1.84e-07 9.52e-08 2.20e-07 erg/cm2
Peak flux Power-law 1.19e+00 1.17e+00 8.14e-01 8.91e-01 3.53e+00 4.07e+00 ph/cm2/s
Error 1.85e-01 1.16e-01 9.29e-02 2.03e-01 3.33e-01 3.75e-01 ph/cm2/s
Fluence Cutoff-PL 2.22e-07 4.41e-07 4.83e-07 3.13e-07 1.34e-06 1.46e-06 erg/cm2
Error 2.92e-08 3.17e-08 4.55e-08 -------- 1.03e-07 1.95e-07 erg/cm2
Peak flux Cutoff-PL 1.12e+00 1.21e+00 8.42e-01 6.39e-01 3.50e+00 3.82e+00 ph/cm2/s
Error 2.14e-01 1.35e-01 1.07e-01 3.36e-01 3.38e-01 4.97e-01 ph/cm2/s
Fluence Band 2.20e-07 4.39e-07 4.82e-07 3.15e-07 1.34e-06 1.46e-06 erg/cm2
Error 2.10e-08 -------- 4.14e-08 -------- 9.84e-08 1.91e-07 erg/cm2
Peak flux Band 1.11e+00 1.21e+00 8.49e-01 6.27e-01 3.49e+00 3.79e+00 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 1.776 0.104 - - 8.36e-03 5.40e-04 89.590 57
CPL 0.804 0.489 58.8 10.5 2.68e-02 1.69e-02 75.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.529 0.152 - - 2.80e-02 2.62e-03 63.050 57
CPL 1.220 0.492 130.3 -35.9 4.01e-02 2.55e-02 62.080 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: 11.200000 sec.
T50 in the 50-300 keV band: 3.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 18.576 -0.288 18.288
T90 11.936 0.432 12.368
T50 4.272 1.984 6.256
Peak 1.000 1.284 2.284
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
93.0873 +50.5002 0.0061 37.6 23.7 2.2594 31.5 TRIG_00742866
------------------------------------------
Foreground time interval of the image:
-0.288 10.545 (delta_t = 10.833 [sec])
Background time interval of the image:
-239.856 -0.288 (delta_t = 239.568 [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 -0.288 sec. to 18.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77610 ( -0.103262 0.105039 )
Norm@50keV : 8.36089E-03 ( -0.00054199 0.000538749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.59 using 59 PHA bins.
# Reduced chi-squared = 1.572 for 57 degrees of freedom
# Null hypothesis probability = 3.789729e-03
Photon flux (15-150 keV) in 18.58 sec: 1.14161 ( -0.0709657 0.0710792 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43151e-06 ( -9.49222e-08 9.5443e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 18.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.803642 ( -0.516639 0.462135 )
Epeak [keV] : 58.7520 ( -7.49873 13.5778 )
Norm@50keV : 2.68322E-02 ( -0.0112313 0.0225832 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.18 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 56 degrees of freedom
# Null hypothesis probability = 4.453580e-02
Photon flux (15-150 keV) in 18.58 sec: 1.09198 ( -0.07427 0.0744 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33995e-06 ( -1.02498e-07 1.03786e-07 ) ergs/cm2
Band function
Time interval is from -0.288 sec. to 18.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.803535 ( -0.42572 0.57177 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 58.7396 ( -7.49783 13.5796 )
Norm@50keV : 2.68350E-02 ( -0.0112337 0.0225999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.18 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 55 degrees of freedom
# Null hypothesis probability = 3.665559e-02
Photon flux (15-150 keV) in 18.58 sec: 1.10162 ( 5.89838 -0.08497 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33988e-06 ( -1.33975e-06 -1.0266e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8254 (-0.869941 0.936169)
R^2/D10^2 : 0.218335 (-0.0505265 0.0653473)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.84 using 59 PHA bins.
# Reduced chi-squared = 1.9797 for 57 degrees of freedom
# Null hypothesis probability = 1.514747e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.415e-07 1.563e-08
25- 50 4.803e-07 3.289e-08
50-150 4.955e-07 6.633e-08
15-150 1.117e-06 7.460e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 102.597 (-18.7996 32.7607)
Norm : 5.08527 (-0.438004 0.427307)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.35 using 59 PHA bins.
# Reduced chi-squared = 1.375 for 57 degrees of freedom
# Null hypothesis probability = 3.186801e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.469e-07 2.462e-08
25- 50 4.292e-07 2.991e-08
50-150 7.056e-07 2.058e-07
15-150 1.382e-06 2.349e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50058 (-1.59754 1.74695)
R1^2/D10^2 : 1.45697 (-0.757142 2.38445)
kT2 [keV] : 19.2085 (-3.03298 5.07001)
R2^2/D10^2 : 3.66086E-02 (-0.0234251 0.0231113)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.08 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 55 degrees of freedom
# Null hypothesis probability = 3.729890e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.182e-07 6.640e-08
25- 50 4.379e-07 1.239e-07
50-150 6.722e-07 2.447e-07
15-150 1.328e-06 3.643e-07
Peak spectrum fit
Power-law model
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52871 ( -0.151291 0.152697 )
Norm@50keV : 2.80480E-02 ( -0.00262701 0.00261726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.05 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.709411e-01
Photon flux (15-150 keV) in 1 sec: 3.52922 ( -0.333084 0.333483 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64876e-07 ( -2.66007e-08 2.67204e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21981 ( -0.593597 0.389505 )
Epeak [keV] : 130.324 ( -58.4251 -130.325 )
Norm@50keV : 4.00657E-02 ( -0.0133833 0.0375823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.08 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.684155e-01
Photon flux (15-150 keV) in 1 sec: 3.49732 ( -0.33789 0.33797 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61328e-07 ( -2.7634e-08 2.7578e-08 ) ergs/cm2
Band function
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21969 ( -0.498091 0.500418 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 130.269 ( -54.1724 -130.269 )
Norm@50keV : 4.00667E-02 ( -0.0140578 0.0375875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.08 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.384747e-01
Photon flux (15-150 keV) in 1 sec: 3.48852 ( ) 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] : 15.7550 (-1.92003 2.20174)
R^2/D10^2 : 0.338092 (-0.124339 0.197097)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.06 using 59 PHA bins.
# Reduced chi-squared = 1.703 for 57 degrees of freedom
# Null hypothesis probability = 7.439793e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.741e-08 3.210e-09
25- 50 7.229e-08 9.410e-09
50-150 1.247e-07 2.055e-08
15-150 2.144e-07 2.690e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-60.3636 -199.363)
Norm : 14.5089 (-1.32589 1.32616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.28 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.939237e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.613e-08 4.310e-09
25- 50 6.950e-08 1.321e-08
50-150 1.524e-07 4.670e-08
15-150 2.581e-07 7.925e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50879 (-1.2942 1.55891)
R1^2/D10^2 : 4.96465 (-2.63853 6.3098)
kT2 [keV] : 26.2948 (-4.81452 7.69798)
R2^2/D10^2 : 4.52331E-02 (-0.0266187 0.0492007)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.76 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.736712e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.642e-08 1.332e-08
25- 50 6.762e-08 1.982e-08
50-150 1.609e-07 6.460e-08
15-150 2.650e-07 9.149e-08
Plot creation:
Fri Mar 17 23:44:18 EDT 2017