batgrbproduct Analysis for Trigger=609878
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Tue Aug 19 07:01:26 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger609878/GCN5_download_cron
======================================================================
Trigger: 00609878 Segment: 000
BAT Trigger Time: 430074616 [s; MET]
Trigger Stop: 430074952 [s; MET]
UTC: 2014-08-18T17:10:03.587900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.160760473972 Dec: -37.6565644153551 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.68
Flight Position: [ source = BAT ]
RA: 258.160760473972 Dec: -37.6565644153551 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.11698576869 Dec: -37.6665817758277 [deg; J2000]
{ 17h 12m 28.1s , -37d 39' 59.7" }
+/- 2.25717962875222 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23253590371199 [arcmin] (formal 1-sigma fit error)
SNR: 9.50657152106955
Angular difference between Flight and Ground position is 2.164341 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 8.84799998998642 +/- 2.43286822237248
Measured from: 129.160000145435
to: 138.008000135422 [s; relative to TRIGTIME]
T50: 3.7600000500679 +/- 2.55939992813286
Measured from: 131.432000100613
to: 135.192000150681 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 133.403999984264
to: 134.403999984264 [s; relative to TRIGTIME]
Total Fluence
Measured from: 128.663999974728
to: 138.487999975681 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.265888 0.026214 -0.001212 0.016456
0.020559 0.017838 0.014535 0.012348 [error]
Peak 0.044068 0.010505 -0.001155 0.006220
0.006589 0.005768 0.004582 0.003878 [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 7.81e-08 2.00e-08 2.70e-09 4.10e-10 1.01e-07 1.01e-07 erg/cm2
Error 1.24e-08 7.97e-09 2.42e-09 7.28e-10 1.85e-08 1.86e-08 erg/cm2
Peak flux Power-law 3.96e-01 1.09e-01 1.60e-02 2.66e-03 5.23e-01 5.23e-01 ph/cm2/s
Error 1.05e-01 5.22e-02 1.86e-02 5.44e-03 1.42e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 8.32e-08 1.34e-08 5.30e-11 3.56e-16 9.67e-08 9.67e-08 erg/cm2
Error 1.38e-08 9.91e-09 9.77e-10 3.24e-10 1.64e-08 1.64e-08 erg/cm2
Peak flux Cutoff-PL 4.13e-01 1.10e-01 3.64e-03 6.47e-06 5.26e-01 5.26e-01 ph/cm2/s
Error 8.72e-02 8.86e-02 1.59e-02 4.13e-03 1.39e-01 1.39e-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 4.890 0.691 - - 2.29e-04 1.62e-04 67.410 57
CPL -0.474 0.000 9.5 0.0 6.45e+00 0.00e+00 64.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.768 0.879 - - 1.03e-03 8.41e-04 62.220 57
CPL 1.534 0.000 5.2 0.0 5.38e-02 0.00e+00 61.180 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 9.824 128.664 138.488
T90 8.848 129.160 138.008
T50 3.760 131.432 135.192
Peak 1.000 133.404 134.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.1170 -37.6666 0.0201 21.1 -138.7 0.3245 9.5 TRIG_00609878
------------------------------------------
Foreground time interval of the image:
128.664 138.488 (delta_t = 9.824 [sec])
Background time interval of the image:
-239.000 128.664 (delta_t = 367.664 [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 128.664 sec. to 138.488 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.89018 ( -0.638633 0.74267 )
Norm@50keV : 2.29132E-04 ( -0.000125161 0.000198788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.628732e-01
Photon flux (15-150 keV) in 9.824 sec: 0.318502 ( -0.0513639 0.0514694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01085e-07 ( -1.8131e-08 1.88738e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 128.664 sec. to 138.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.473757 ( )
Epeak [keV] : 9.54528 ( )
Norm@50keV : 6.44879 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.91 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 56 degrees of freedom
# Null hypothesis probability = 1.940175e-01
Photon flux (15-150 keV) in 9.824 sec: 0.319633 ( -0.049941 0.050135 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66803e-08 ( -1.60182e-08 1.68173e-08 ) ergs/cm2
Band function
Time interval is from 128.664 sec. to 138.488 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.44439 ( 5.987 8.44439 )
beta : -4.89062 ( -0.741754 0.638935 )
Epeak [keV] : 309.622 ( -309.622 -309.622 )
Norm@50keV : 3.11287E-02 ( -0.0169997 0.0270265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.216506e-01
Photon flux (15-150 keV) in 9.824 sec: 0.166053 ( 6.83395 -0.166053 ) 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] : 2.98016 (-0.4248 0.499691)
R^2/D10^2 : 47.6596 (-29.6418 85.7363)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.01 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.177576e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.399e-08 4.712e-08
25- 50 1.196e-08 5.931e-09
50-150 1.825e-11 1.854e-11
15-150 9.596e-08 5.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.02291 (-1.30884 1.79671)
Norm : 39.8236 (-20.8208 50.0741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.10 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.155486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.207e-08 3.516e-08
25- 50 1.538e-08 8.132e-09
50-150 1.884e-10 1.817e-10
15-150 9.764e-08 3.434e-08
Double BB
R1^2/D10^2 : 21.9729 (-29.6386 85.7396)
kT2 [keV] : 2.04305 ( )
R2^2/D10^2 : 152.244 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.01 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.94 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 55 degrees of freedom
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.672746e-01
# Null hypothesis probability = 1.689055e-01
# Null hypothesis probability = 1.697522e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 133.404 sec. to 134.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.76826 ( -0.735667 1.02146 )
Norm@50keV : 1.03434E-03 ( -0.000687499 0.000993932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.22 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.957807e-01
Photon flux (15-150 keV) in 1 sec: 0.522606 ( -0.141744 0.142886 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93589e-08 ( -6.25386e-09 7.04378e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 133.404 sec. to 134.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53375 ( )
Epeak [keV] : 5.15936 ( )
Norm@50keV : 5.37546E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.18 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 56 degrees of freedom
# Null hypothesis probability = 2.952384e-01
Photon flux (15-150 keV) in 1 sec: 0.526185 ( -0.138148 0.139372 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81922e-08 ( -5.5582e-09 6.6969e-09 ) ergs/cm2
Band function
Time interval is from 133.404 sec. to 134.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60592 ( -6.82757 1.6059 )
beta : -9.37167 ( 9.37167 19.37 )
Epeak [keV] : 4.59355 ( -4.77612 14.6895 )
Norm@50keV : 4.57471E-02 ( -0.0473047 1.16283e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.19 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.634263e-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] : 3.96337 (-0.964539 1.2522)
R^2/D10^2 : 14.6925 (-14.6926 53.2815)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.194290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.278e-08 7.555e-09
25- 50 4.494e-09 2.898e-09
50-150 5.166e-11 5.390e-11
15-150 1.732e-08 9.880e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.4194 (-4.08084 7.33189)
Norm : 17.0419 (-9.77273 33.9558)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.285550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.230e-08 7.163e-09
25- 50 5.591e-09 3.482e-09
50-150 4.280e-10 4.480e-10
15-150 1.832e-08 1.086e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.32591 (-3.31319 1.78202)
R1^2/D10^2 : 29.3999 (-30.2168 -30.2168)
kT2 [keV] : 7.15127 (-7.06206 -7.06206)
R2^2/D10^2 : 0.282144 (-0.338296 58.8567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.03 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.680659e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 7.585e-09
25- 50 5.471e-09 3.377e-09
50-150 6.122e-10 6.460e-10
15-150 1.860e-08 1.248e-08
Plot creation:
Tue Aug 19 07:03:54 EDT 2014