batgrbproduct Analysis for Trigger=609879
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 06:58:09 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger609879/GCN5_download_cron
======================================================================
Trigger: 00609879 Segment: 000
BAT Trigger Time: 430075032 [s; MET]
Trigger Stop: 430075352 [s; MET]
UTC: 2014-08-18T17:16:59.587880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.159734706471 Dec: -37.6496738949224 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.75
Flight Position: [ source = BAT ]
RA: 258.159734706471 Dec: -37.6496738949224 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.259142914925 Dec: -37.6585603883429 [deg; J2000]
{ 17h 13m 02.2s , -37d 39' 30.8" }
+/- 3.69617586218883 [arcmin] (estimated 90% radius based on SNR)
+/- 2.47183684355036 [arcmin] (formal 1-sigma fit error)
SNR: 4.69940851215689
Angular difference between Flight and Ground position is 4.752172 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0800000429153442 +/- 0.0357770535203468
Measured from: 293.272000133991
to: 293.352000176907 [s; relative to TRIGTIME]
T50: 0.0480000376701355 +/- 0.0576888050663296
Measured from: 293.288000106812
to: 293.336000144482 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 292.82800000906
to: 293.82800000906 [s; relative to TRIGTIME]
Total Fluence
Measured from: 293.272000014782
to: 293.367999970913 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.007756 0.002326 0.002930 0.003523
0.002071 0.001581 0.001455 0.001189 [error]
Peak 0.030494 0.006855 -0.003039 0.001218
0.006293 0.005250 0.004517 0.003743 [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 1.57e-09 2.02e-09 1.89e-09 3.12e-09 6.53e-09 8.60e-09 erg/cm2
Error 1.25e-09 6.95e-10 1.56e-09 5.05e-09 2.66e-09 5.84e-09 erg/cm2
Peak flux Power-law 2.57e-01 5.43e-02 5.78e-03 6.75e-04 3.17e-01 3.17e-01 ph/cm2/s
Error 9.01e-02 4.14e-02 1.07e-02 2.88e-03 1.22e-01 1.22e-01 ph/cm2/s
Fluence Cutoff-PL 1.63e-09 2.01e-09 1.80e-09 2.76e-09 6.41e-09 8.20e-09 erg/cm2
Error 6.40e-10 6.96e-10 1.56e-09 5.03e-09 2.66e-09 5.87e-09 erg/cm2
Peak flux Cutoff-PL 3.06e-01 2.30e-02 4.12e-07 3.72e-19 3.29e-01 3.29e-01 ph/cm2/s
Error 1.04e-01 4.28e-02 6.18e-03 0.00e+00 1.12e-01 1.12e-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 2.093 0.882 - - 7.33e-03 3.43e-03 61.820 57
CPL 2.110 0.000 47.1 0.0 6.14e-03 0.00e+00 61.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.233 1.405 - - 4.18e-04 5.99e-04 62.310 57
CPL 1.000 0.000 50.0 0.0 4.31e-03 0.00e+00 77.180 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 0.096 293.272 293.368
T90 0.080 293.272 293.352
T50 0.048 293.288 293.336
Peak 1.000 292.828 293.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.2591 -37.6586 0.0409 0.1 107.2 0.0145 4.7 TRIG_00609879
------------------------------------------
Foreground time interval of the image:
293.272 293.368 (delta_t = 0.096 [sec])
Background time interval of the image:
181.000 293.272 (delta_t = 112.272 [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 293.272 sec. to 293.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09321 ( -0.791028 0.972891 )
Norm@50keV : 7.32842E-03 ( -0.00375744 0.00309765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.079527e-01
Photon flux (15-150 keV) in 0.096 sec: 1.14924 ( -0.406146 0.404794 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53048e-09 ( -2.6171e-09 2.6955e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 293.272 sec. to 293.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11005 ( )
Epeak [keV] : 47.0584 ( )
Norm@50keV : 6.13676E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.54 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.845893e-01
Photon flux (15-150 keV) in 0.096 sec: 1.14862 ( -0.391683 0.40505 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4131e-09 ( -2.49502e-09 2.81913e-09 ) ergs/cm2
Band function
Time interval is from 293.272 sec. to 293.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59949 ( 1.60191 1.60191 )
beta : -2.08886 ( 2.09243 0.78981 )
Epeak [keV] : 11.2177 ( -10.6405 -10.6405 )
Norm@50keV : 2.25484E-02 ( -0.0229996 3393.23 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Null hypothesis probability = 2.455737e-01
Photon flux (15-150 keV) in 0.096 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] : 5.32728 (-2.3239 25.4821)
R^2/D10^2 : 6.33723 (-6.11424 100.481)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.80 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.360486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.894e-09 1.187e-09
25- 50 1.442e-09 1.008e-09
50-150 7.896e-11 8.261e-11
15-150 3.415e-09 2.155e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.8239 (-98.818 -98.818)
Norm : 4.70153 (-1.98456 8.91199)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.599768e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.180e-09 7.229e-10
25- 50 2.031e-09 1.321e-09
50-150 3.249e-09 2.538e-09
15-150 6.460e-09 4.450e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.69970 (-1.50594 2.56744)
R1^2/D10^2 : 31.7740 (-29.2241 161.921)
kT2 [keV] : 27.4929 (-13.0138 -27.4929)
R2^2/D10^2 : 1.07387E-02 (-0.0105423 0.0478389)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.226405e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.005e-09 1.262e-09
25- 50 1.302e-09 7.018e-10
50-150 4.196e-09 2.935e-09
15-150 7.503e-09 4.152e-09
Peak spectrum fit
Power-law model
Time interval is from 292.828 sec. to 293.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.23323 ( -1.11091 1.69814 )
Norm@50keV : 4.18431E-04 ( -0.000417955 0.00077913 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.929198e-01
Photon flux (15-150 keV) in 1 sec: 0.317125 ( -0.120402 0.122995 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0973e-08 ( -4.77809e-09 5.72669e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 292.828 sec. to 293.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.30971E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.18 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 56 degrees of freedom
# Null hypothesis probability = 3.185142e-02
Photon flux (15-150 keV) in 1 sec: 0.328656 ( -0.112102 0.112595 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01003e-08 ( -3.60795e-09 3.8184e-09 ) ergs/cm2
Band function
Time interval is from 292.828 sec. to 293.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.24559 ( 1.59327 1.59327 )
beta : -10.0000 ( 9.99875 0.0162208 )
Epeak [keV] : 15.0972 ( -3.86671 14.756 )
Norm@50keV : 5064.58 ( -1715.67 51343.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.65 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.795472e-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] : 3.32173 (-0.92908 1.2399)
R^2/D10^2 : 24.8390 (-24.8385 160.295)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.91 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.371185e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.510e-09 4.876e-09
25- 50 1.747e-09 1.254e-09
50-150 6.170e-12 7.235e-12
15-150 1.026e-08 6.540e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.43638 (-3.22017 6.88579)
Norm : 22.0786 (-22.1028 94.273)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.195611e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.084e-09 4.873e-09
25- 50 2.227e-09 1.604e-09
50-150 6.129e-11 7.030e-11
15-150 1.037e-08 6.250e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.32174 (-0.929078 1.23991)
R1^2/D10^2 : 24.8386 (-24.8386 160.296)
kT2 [keV] : 0.119111 (-0.119111 -0.119111)
R2^2/D10^2 : 5.65098E-04 (-0.000565098 -0.000565098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.91 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.717243e-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
Plot creation:
Tue Aug 19 07:00:34 EDT 2014