batgrbproduct Analysis for Trigger=575905
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): Sat Oct 26 18:29:29 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger575905/GCN5_download_cron
======================================================================
Trigger: 00575905 Segment: 000
BAT Trigger Time: 404462384 [s; MET]
Trigger Stop: 404462448 [s; MET]
UTC: 2013-10-26T06:39:32.803900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 15.5467628551536 Dec: 32.4869557018026 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 15.5467628551536 Dec: 32.4869557018026 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 15.5264462668451 Dec: 32.4750551324588 [deg; J2000]
{ 01h 02m 06.3s , +32d 28' 30.2" }
+/- 4.44495927591399 [arcmin] (estimated 90% radius based on SNR)
+/- 2.61162881547332 [arcmin] (formal 1-sigma fit error)
SNR: 3.61071301054591
Angular difference between Flight and Ground position is 1.251903 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.108391 0.169383 0.023065 0.027520
0.039116 0.040225 0.035288 0.031327 [error]
Peak 0.108391 0.169383 0.023065 0.027520
0.039116 0.040225 0.035288 0.031327 [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 3.21e-08 4.54e-08 4.75e-08 9.17e-08 1.54e-07 2.18e-07 erg/cm2
Error 1.41e-08 1.68e-08 2.78e-08 1.17e-07 6.83e-08 1.41e-07 erg/cm2
Peak flux Power-law 1.67e-02 1.30e-02 6.82e-03 5.17e-03 3.89e-02 4.17e-02 ph/cm2/s
Error 7.45e-03 4.76e-03 3.87e-03 6.19e-03 1.41e-02 1.54e-02 ph/cm2/s
Fluence Cutoff-PL 2.27e-08 7.97e-08 1.73e-08 3.12e-11 1.20e-07 1.20e-07 erg/cm2
Error 1.67e-08 2.82e-08 2.61e-08 3.17e-09 4.41e-08 4.41e-08 erg/cm2
Peak flux Cutoff-PL 1.10e-02 2.28e-02 2.96e-03 2.92e-06 3.68e-02 3.68e-02 ph/cm2/s
Error 8.54e-03 7.95e-03 4.06e-03 2.68e-04 1.31e-02 1.31e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.941 0.595 - - 2.66e-04 1.21e-04 58.540 57
CPL -6.533 0.000 35.7 5.2 4.87e+01 0.00e+00 51.250 56
The chi2 of BB fit is 52.37 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.941 0.595 - - 2.66e-04 1.21e-04 58.540 57
CPL -6.533 0.000 35.7 5.2 4.87e+01 0.00e+00 51.250 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
15.5264 +32.4751 0.0533 9.5 114.6 0.2867 3.6 TRIG_00575905
------------------------------------------
Foreground time interval of the image:
0.000 12.640 (delta_t = 12.640 [sec])
14.000 64.000 (delta_t = 50.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.640000
14.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94137 ( -0.544107 0.646783 )
Norm@50keV : 2.66048E-04 ( -0.000120637 0.000121064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185640e-01
Photon flux (15-150 keV) in 62.64 sec: 3.88845E-02 ( -0.014023 0.0140818 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53904e-07 ( -6.49057e-08 7.17541e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.640000
14.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.53252 ( )
Epeak [keV] : 35.7391 ( -6.04937 4.4215 )
Norm@50keV : 48.7049 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.9151 for 56 degrees of freedom
# Null hypothesis probability = 6.550285e-01
Photon flux (15-150 keV) in 62.64 sec: 3.67956E-02 ( -0.0129207 0.0132603 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19722e-07 ( -4.09334e-08 4.73189e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 12.640000
14.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.67365 -4.83028 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 35.9689 ( -6.28852 7.52233 )
Norm@50keV : 5.69273 ( -1.76518 14.4046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.9311 for 55 degrees of freedom
# Null hypothesis probability = 6.202449e-01
Photon flux (15-150 keV) in 62.64 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] : 9.45628 (-2.1916 2.93541)
R^2/D10^2 : 2.69162E-02 (-0.0269352 0.0457077)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9187 for 57 degrees of freedom
# Null hypothesis probability = 6.492667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.005e-08 1.838e-08
25- 50 6.889e-08 4.341e-08
50-150 3.051e-08 2.303e-08
15-150 1.294e-07 8.190e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3928 (-30.2497 -56.1872)
Norm : 0.218680 (-0.0929943 0.14732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 0.9939 for 57 degrees of freedom
# Null hypothesis probability = 4.880526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.406e-08 2.163e-08
25- 50 5.083e-08 3.220e-08
50-150 5.487e-08 4.626e-08
15-150 1.398e-07 9.330e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.33919E-02 (-0.0833919 -0.0833919)
R1^2/D10^2 : 3.79162E-06 (-3.79164e-06 -3.79164e-06)
kT2 [keV] : 9.45419 (-2.1921 2.93491)
R2^2/D10^2 : 2.69381E-02 (-0.0269382 0.0457048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9521 for 55 degrees of freedom
# Null hypothesis probability = 5.758509e-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 14.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94137 ( -0.544107 0.646783 )
Norm@50keV : 2.66048E-04 ( -0.000120637 0.000121064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185640e-01
Photon flux (15-150 keV) in 62.64 sec: 3.88845E-02 ( -0.014023 0.0140818 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53904e-07 ( -6.49057e-08 7.17541e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.53252 ( )
Epeak [keV] : 35.7391 ( -6.04937 4.4215 )
Norm@50keV : 48.7049 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.9151 for 56 degrees of freedom
# Null hypothesis probability = 6.550285e-01
Photon flux (15-150 keV) in 62.64 sec: 3.67956E-02 ( -0.0129207 0.0132603 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19722e-07 ( -4.09334e-08 4.73189e-08 ) ergs/cm2
Band function
Time interval is from 14.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.67365 -4.83028 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 35.9689 ( -6.28852 7.52233 )
Norm@50keV : 5.69273 ( -1.76518 14.4046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.9311 for 55 degrees of freedom
# Null hypothesis probability = 6.202449e-01
Photon flux (15-150 keV) in 62.64 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] : 9.45628 (-2.1916 2.93541)
R^2/D10^2 : 2.69162E-02 (-0.0269352 0.0457077)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9187 for 57 degrees of freedom
# Null hypothesis probability = 6.492667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.005e-08 1.852e-08
25- 50 6.889e-08 4.225e-08
50-150 3.051e-08 2.217e-08
15-150 1.294e-07 8.409e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3928 (-30.2497 -56.1872)
Norm : 0.218680 (-0.0929943 0.14732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 0.9939 for 57 degrees of freedom
# Null hypothesis probability = 4.880526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.406e-08 2.194e-08
25- 50 5.083e-08 3.279e-08
50-150 5.487e-08 4.617e-08
15-150 1.398e-07 9.396e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.33919E-02 (-0.0833919 -0.0833919)
R1^2/D10^2 : 3.79162E-06 (-3.79164e-06 -3.79164e-06)
kT2 [keV] : 9.45419 (-2.1921 2.93491)
R2^2/D10^2 : 2.69381E-02 (-0.0269382 0.0457048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9521 for 55 degrees of freedom
# Null hypothesis probability = 5.758509e-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:
Sat Oct 26 18:56:22 EDT 2013