batgrbproduct Analysis for Trigger=653978
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 Sep 1 12:19:45 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger653978/GCN5_download_cron
======================================================================
Trigger: 00653978 Segment: 000
BAT Trigger Time: 462752382.336 [s; MET]
Trigger Stop: 462752383.36 [s; MET]
UTC: 2015-08-31T22:19:27.264720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.021331292747 Dec: -27.2521426009604 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.54
Image Trigger?: NO
Rate S/N Ratio: 16.1864140562386 [ if not an image trigger ]
Image S/N Ratio: 8.54
Flight Position: [ source = BAT ]
RA: 271.021331292747 Dec: -27.2521426009604 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.030184816306 Dec: -27.2428874446872 [deg; J2000]
{ 18h 04m 07.2s , -27d 14' 34.4" }
+/- 1.969041516803 [arcmin] (estimated 90% radius based on SNR)
+/- 0.814850082294598 [arcmin] (formal 1-sigma fit error)
SNR: 11.5545829672116
Angular difference between Flight and Ground position is 0.728975 arcmin
Partial Coding Fraction: 0.0703125 [ including projection effects ]
Duration
T90: 6.19200003147125 +/- 1.00993469991815
Measured from: -0.311999917030334
to: 5.88000011444092 [s; relative to TRIGTIME]
T50: 3.20000004768372 +/- 0.634577021043141
Measured from: 0.392000079154968
to: 3.59200012683868 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.148000001907349
to: 0.851999998092651 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.584000051021576
to: 6.83999997377396 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.570898 0.869497 0.500841 0.188875
0.079162 0.085156 0.075075 0.063742 [error]
Peak 0.157233 0.230359 0.202601 0.058001
0.032865 0.037534 0.033900 0.025734 [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 2.73e-07 4.01e-07 4.40e-07 9.04e-07 1.39e-06 2.02e-06 erg/cm2
Error 4.93e-08 4.78e-08 7.18e-08 2.96e-07 1.76e-07 3.67e-07 erg/cm2
Peak flux Power-law 2.42e+00 2.06e+00 1.20e+00 1.04e+00 6.13e+00 6.71e+00 ph/cm2/s
Error 6.45e-01 3.63e-01 2.52e-01 4.16e-01 1.08e+00 1.13e+00 ph/cm2/s
Fluence Cutoff-PL 2.29e-07 4.60e-07 4.62e-07 2.14e-07 1.30e-06 1.36e-06 erg/cm2
Error 5.94e-08 6.84e-08 8.85e-08 2.77e-07 1.93e-07 3.30e-07 erg/cm2
Peak flux Cutoff-PL 2.02e+00 2.24e+00 1.35e+00 5.37e-01 5.97e+00 6.15e+00 ph/cm2/s
Error 7.81e-01 4.39e-01 3.29e-01 5.21e-01 1.10e+00 1.21e+00 ph/cm2/s
Fluence Band 2.04e-07 4.89e-07 4.31e-07 4.53e-07 1.31e-06 1.58e-06 erg/cm2
Error -------- 7.56e-08 8.63e-08 -------- 1.84e-07 -------- erg/cm2
Peak flux Band 2.08e+00 2.21e+00 1.33e+00 5.96e-01 6.01e+00 6.22e+00 ph/cm2/s
Error 7.75e-01 4.39e-01 -------- -------- 1.06e+00 1.21e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.868 0.195 - - 2.04e-02 2.57e-03 64.970 57
CPL 0.608 1.164 52.1 17.5 9.44e-02 2.53e-01 59.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.783 0.266 - - 4.48e-02 7.77e-03 64.890 57
CPL 0.896 1.175 67.0 -23.4 1.21e-01 2.49e-01 62.940 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: 1.472000 sec.
T50 in the 50-300 keV band: 0.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.424 -0.584 6.840
T90 6.192 -0.312 5.880
T50 3.200 0.392 3.592
Peak 1.000 -0.148 0.852
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.0302 -27.2429 0.0166 57.1 -4.9 2.0847 11.6 TRIG_00653978
------------------------------------------
Foreground time interval of the image:
-0.584 6.840 (delta_t = 7.424 [sec])
Background time interval of the image:
-48.035 -0.584 (delta_t = 47.451 [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 -0.584 sec. to 6.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86835 ( -0.190756 0.199065 )
Norm@50keV : 2.03789E-02 ( -0.00258225 0.0025517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.189381e-01
Photon flux (15-150 keV) in 7.424 sec: 2.88607 ( -0.3519 0.353052 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39089e-06 ( -1.74967e-07 1.76039e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.584 sec. to 6.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.608055 ( -1.35532 0.971719 )
Epeak [keV] : 52.1101 ( -9.79309 25.172 )
Norm@50keV : 9.44041E-02 ( -0.0944315 0.411439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.409988e-01
Photon flux (15-150 keV) in 7.424 sec: 2.75961 ( -0.36786 0.36665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30149e-06 ( -1.93752e-07 1.93135e-07 ) ergs/cm2
Band function
Time interval is from -0.584 sec. to 6.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.333756 ( -1.5098 3.58631 )
beta : -2.56723 ( 2.56872 0.539739 )
Epeak [keV] : 44.2619 ( -10.0797 11.8731 )
Norm@50keV : 0.351348 ( -0.392316 57.5797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.72 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.749226e-01
Photon flux (15-150 keV) in 7.424 sec: 2.75280 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31084e-06 ( -1.31079e-06 -1.84405e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9032 (-1.37335 1.56598)
R^2/D10^2 : 0.742314 (-0.280145 0.438194)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.54 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 57 degrees of freedom
# Null hypothesis probability = 2.047130e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.650e-07 3.415e-08
25- 50 5.144e-07 8.192e-08
50-150 4.359e-07 1.010e-07
15-150 1.115e-06 1.611e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.6750 (-26.3497 47.5548)
Norm : 13.2611 (-2.24444 2.5717)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.347753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.569e-07 4.599e-08
25- 50 4.341e-07 5.308e-08
50-150 6.595e-07 2.773e-07
15-150 1.350e-06 2.906e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.61511 (-2.28902 1.94113)
R1^2/D10^2 : 1.38066 (-0.574041 1.42193)
kT2 [keV] : 34.5742 (-19.9427 -38.5132)
R2^2/D10^2 : 6.06598E-03 (-0.00446366 0.075617)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Null hypothesis probability = 2.177313e-01
# Null hypothesis probability = 3.932375e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.190e-07 9.191e-08
25- 50 4.716e-07 1.914e-07
50-150 4.998e-07 1.967e-07
15-150 1.190e-06 3.542e-07
Peak spectrum fit
Power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78325 ( -0.258355 0.27349 )
Norm@50keV : 4.47519E-02 ( -0.00781006 0.00772997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.89 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.210153e-01
Photon flux (15-150 keV) in 1 sec: 6.12717 ( -1.07851 1.08297 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12255e-07 ( -7.26685e-08 7.28904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.895611 ( -1.32531 1.02454 )
Epeak [keV] : 66.9943 ( -20.2909 -66.996 )
Norm@50keV : 0.120763 ( -0.120756 0.377947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.94 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 56 degrees of freedom
# Null hypothesis probability = 2.442611e-01
Photon flux (15-150 keV) in 1 sec: 5.97396 ( -1.09493 1.09953 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09383e-07 ( -7.3531e-08 7.3671e-08 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.895635 ( -6.83344 1.44761 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 66.9691 ( -19.3363 275.73 )
Norm@50keV : 0.120775 ( -0.120775 0.377912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.94 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.159160e-01
Photon flux (15-150 keV) in 1 sec: 6.00654 ( 0.99346 -1.06147 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09434e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1271 (-2.59505 2.93221)
R^2/D10^2 : 0.678261 (-0.332476 0.667015)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.11 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.138824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.245e-08 1.033e-08
25- 50 1.299e-07 3.295e-08
50-150 2.031e-07 6.370e-08
15-150 3.655e-07 8.610e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 124.018 (-50.8131 -122.006)
Norm : 25.9116 (-5.17969 6.86942)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.33 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.631186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.739e-08 2.080e-08
25- 50 1.213e-07 4.482e-08
50-150 2.199e-07 1.412e-07
15-150 4.085e-07 1.765e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.65341 (-2.93764 3.73424)
R1^2/D10^2 : 13.4259 (-11.2571 410)
kT2 [keV] : 20.0853 (-4.57358 9.12087)
R2^2/D10^2 : 0.190711 (-0.152194 0.267072)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.441822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.689e-08 3.910e-08
25- 50 1.195e-07 6.325e-08
50-150 2.246e-07 1.334e-07
15-150 4.109e-07 2.005e-07
Plot creation:
Tue Sep 1 12:27:19 EDT 2015