batgrbproduct Analysis for Trigger=652603
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): Wed Aug 19 15:42:46 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger652603/GCN5_download_cron
======================================================================
Trigger: 00652603 Segment: 000
BAT Trigger Time: 461590607.936 [s; MET]
Trigger Stop: 461590608.96 [s; MET]
UTC: 2015-08-18T11:36:32.925720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 230.446048357731 Dec: 68.3422608837458 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.04
Image Trigger?: NO
Rate S/N Ratio: 12.9228479833201 [ if not an image trigger ]
Image S/N Ratio: 8.04
Flight Position: [ source = BAT ]
RA: 230.446048357731 Dec: 68.3422608837458 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 230.348408872635 Dec: 68.3415484183389 [deg; J2000]
{ 15h 21m 23.6s , +68d 20' 29.6" }
+/- 1.04397831279502 [arcmin] (estimated 90% radius based on SNR)
+/- 0.359015801193477 [arcmin] (formal 1-sigma fit error)
SNR: 28.6033084961073
Angular difference between Flight and Ground position is 2.162554 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 118.967999994755 +/- 22.1347496117046
Measured from: -3.4799998998642
to: 115.488000094891 [s; relative to TRIGTIME]
T50: 41.0119999647141 +/- 6.65706396738856
Measured from: 3.48000013828278
to: 44.4920001029968 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.56800001859665
to: 2.56800001859665 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.91200000047684
to: 176.019999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.388568 2.578449 1.468425 0.406450
0.093618 0.094625 0.083413 0.073951 [error]
Peak 0.095903 0.096160 0.061176 0.003256
0.012018 0.012085 0.010670 0.008403 [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 8.91e-07 1.22e-06 1.24e-06 2.29e-06 4.09e-06 5.64e-06 erg/cm2
Error 6.93e-08 5.59e-08 8.75e-08 3.44e-07 1.99e-07 4.14e-07 erg/cm2
Peak flux Power-law 1.04e+00 7.90e-01 4.02e-01 2.94e-01 2.37e+00 2.52e+00 ph/cm2/s
Error 2.22e-01 1.10e-01 9.10e-02 1.30e-01 3.35e-01 3.52e-01 ph/cm2/s
Fluence Cutoff-PL 8.88e-07 1.22e-06 1.24e-06 2.11e-06 4.08e-06 5.47e-06 erg/cm2
Error 6.90e-08 5.53e-08 6.67e-08 4.37e-07 1.96e-07 5.78e-07 erg/cm2
Peak flux Cutoff-PL 1.03e+00 7.96e-01 4.03e-01 2.68e-01 2.36e+00 2.50e+00 ph/cm2/s
Error 2.40e-01 1.27e-01 9.32e-02 2.18e-01 3.42e-01 4.02e-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 1.980 0.091 - - 2.41e-03 1.21e-04 50.870 57
CPL 2.030 0.092 21.5 0.0 2.24e-03 0.00e+00 50.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.975 0.270 - - 1.60e-02 2.71e-03 60.130 57
CPL 1.910 0.675 61.9 0.0 1.73e-02 0.00e+00 60.110 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: 130.176000 sec.
T50 in the 50-300 keV band: 31.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 183.932 -7.912 176.020
T90 118.968 -3.480 115.488
T50 41.012 3.480 44.492
Peak 1.000 1.568 2.568
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
230.3484 +68.3415 0.0068 43.9 -149.5 3.2810 28.6 TRIG_00652603
------------------------------------------
Foreground time interval of the image:
-7.912 11.665 (delta_t = 19.577 [sec])
Background time interval of the image:
-65.735 -7.912 (delta_t = 57.823 [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 -7.912 sec. to 176.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98025 ( -0.0905839 0.0920798 )
Norm@50keV : 2.41321E-03 ( -0.000121986 0.000120888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.8925 for 57 degrees of freedom
# Null hypothesis probability = 7.028247e-01
Photon flux (15-150 keV) in 183.9 sec: 0.358734 ( -0.0173564 0.0174492 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08867e-06 ( -1.98338e-07 1.99188e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.912 sec. to 176.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02972 ( -0.0908773 0.0925498 )
Epeak [keV] : 21.4846 ( )
Norm@50keV : 2.23925E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.35 using 59 PHA bins.
# Reduced chi-squared = 0.8990 for 56 degrees of freedom
# Null hypothesis probability = 6.878818e-01
Photon flux (15-150 keV) in 183.9 sec: 0.358555 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07949e-06 ( -1.90097e-07 2.01665e-07 ) ergs/cm2
Band function
Time interval is from -7.912 sec. to 176.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95679 ( -4.95679 -4.95679 )
beta : -2.00047 ( -0.102684 0.0945483 )
Epeak [keV] : 19.3140 ( -19.314 3.31246 )
Norm@50keV : 1898.06 ( -85.0385 2.77557e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.20 using 59 PHA bins.
# Reduced chi-squared = 0.9128 for 55 degrees of freedom
# Null hypothesis probability = 6.580519e-01
Photon flux (15-150 keV) in 183.9 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] : 11.2039 ( )
R^2/D10^2 : 9.98746E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 212.58 using 59 PHA bins.
# Reduced chi-squared = 3.7295 for 57 degrees of freedom
# Null hypothesis probability = 8.652119e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.834e-07 4.285e-08
25- 50 1.399e-06 7.200e-08
50-150 1.006e-06 1.155e-07
15-150 2.889e-06 1.545e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.2434 (-12.3224 15.9979)
Norm : 1.61663 (-0.126632 0.1416)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.10 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.692607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.722e-07 5.195e-08
25- 50 1.276e-06 5.885e-08
50-150 1.820e-06 1.887e-07
15-150 3.868e-06 2.198e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.08229 (-0.701056 0.755487)
R1^2/D10^2 : 0.845306 (-0.308838 0.541603)
kT2 [keV] : 25.2671 (-3.836 5.54034)
R2^2/D10^2 : 3.57350E-03 (-0.00179585 0.00304128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9729 for 55 degrees of freedom
# Null hypothesis probability = 5.318249e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.515e-07 1.178e-07
25- 50 1.214e-06 1.120e-07
50-150 2.031e-06 3.159e-07
15-150 4.096e-06 4.542e-07
Peak spectrum fit
Power-law model
Time interval is from 1.568 sec. to 2.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97524 ( -0.261015 0.279824 )
Norm@50keV : 1.59592E-02 ( -0.00276283 0.00266576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.631244e-01
Photon flux (15-150 keV) in 1 sec: 2.36704 ( -0.334243 0.334774 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47002e-07 ( -2.37839e-08 2.42547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.568 sec. to 2.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90970 ( -1.04104 0.308879 )
Epeak [keV] : 61.9324 ( )
Norm@50keV : 1.73475E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.11 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.291546e-01
Photon flux (15-150 keV) in 1 sec: 2.36021 ( -0.34444 0.33943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46241e-07 ( -2.6248e-08 2.4817e-08 ) ergs/cm2
Band function
Time interval is from 1.568 sec. to 2.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.980491 ( 0.97362 0.97362 )
beta : -1.98380 ( 1.98479 0.269191 )
Epeak [keV] : 20.6122 ( -20.1718 -20.1718 )
Norm@50keV : 0.107626 ( -0.11625 5.22661e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.10 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.962985e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46964e-07 ( -1.46957e-07 -2.4828e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5103 (-1.76951 2.20751)
R^2/D10^2 : 0.883494 (-0.457671 0.915423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.12 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.614203e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.018e-08 5.340e-09
25- 50 5.374e-08 1.111e-08
50-150 3.234e-08 1.105e-08
15-150 1.063e-07 2.094e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.9706 (-28.0046 60.2845)
Norm : 11.1756 (-2.2262 3.03438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.15 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.293664e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.889e-08 5.575e-09
25- 50 4.696e-08 7.565e-09
50-150 6.398e-08 3.485e-08
15-150 1.398e-07 3.656e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.73642 (-1.76851 2.74843)
R1^2/D10^2 : 14.1907 (-11.6121 112.261)
kT2 [keV] : 19.2004 (-6.04252 14.0786)
R2^2/D10^2 : 7.16064E-02 (-0.0619073 0.245895)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.74 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 55 degrees of freedom
# Null hypothesis probability = 2.769029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.282e-08 1.792e-08
25- 50 4.081e-08 1.929e-08
50-150 6.848e-08 4.099e-08
15-150 1.421e-07 7.083e-08
Plot creation:
Wed Aug 19 15:50:21 EDT 2015