batgrbproduct Analysis for Trigger=504215
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 Sep 28 10:20:56 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger504215/GCN5_download_cron
======================================================================
Trigger: 00504215 Segment: 000
BAT Trigger Time: 338867499.2 [s; MET]
Trigger Stop: 338867507.392 [s; MET]
UTC: 2011-09-28T01:51:31.789800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.754544715356 Dec: 36.5702621705059 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.03
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 7.03
Flight Position: [ source = BAT ]
RA: 257.754544715356 Dec: 36.5702621705059 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 257.756524718619 Dec: 36.5523269183905 [deg; J2000]
{ 17h 11m 01.6s , +36d 33' 08.4" }
+/- 2.17178995343163 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05636915622408 [arcmin] (formal 1-sigma fit error)
SNR: 10.0450028897027
Angular difference between Flight and Ground position is 1.080338 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 26.7599999308586 +/- 4.45298279703134
Measured from: -0.0159998536109924
to: 26.7440000772476 [s; relative to TRIGTIME]
T50: 9.40799993276596 +/- 6.48839484463679
Measured from: 3.75200015306473
to: 13.1600000858307 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.8400000333786
to: 7.8400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.09200000762939
to: 27.8600000143051 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.143858 0.273178 0.356292 0.154922
0.055060 0.052719 0.044806 0.037678 [error]
Peak 0.018647 0.039411 0.032272 0.019555
0.010202 0.009712 0.008367 0.007200 [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 5.42e-08 1.33e-07 2.59e-07 1.25e-06 6.99e-07 1.69e-06 erg/cm2
Error 2.08e-08 3.04e-08 4.18e-08 4.90e-07 1.11e-07 4.95e-07 erg/cm2
Peak flux Power-law 2.92e-01 2.90e-01 2.03e-01 2.24e-01 8.74e-01 1.01e+00 ph/cm2/s
Error 1.47e-01 9.30e-02 6.63e-02 1.50e-01 2.64e-01 2.84e-01 ph/cm2/s
Fluence Cutoff-PL 5.15e-08 1.33e-07 2.64e-07 1.05e-06 6.97e-07 1.50e-06 erg/cm2
Error 2.52e-08 3.12e-08 5.10e-08 8.88e-07 1.13e-07 7.21e-07 erg/cm2
Peak flux Cutoff-PL 2.07e-01 3.26e-01 2.28e-01 6.06e-02 8.09e-01 8.21e-01 ph/cm2/s
Error 1.71e-01 1.16e-01 8.40e-02 2.77e-01 2.37e-01 0.00e+00 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 8.62e-01 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 1.035 0.301 - - 2.26e-03 3.95e-04 55.480 57
CPL 2.056 0.000 19.6 0.0 2.01e-04 0.00e+00 54.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.518 0.475 - - 6.97e-03 1.97e-03 62.310 57
CPL -0.149 3.129 65.7 -22.4 4.56e-02 2.56e+00 60.810 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: 19.328000 sec.
T50 in the 50-300 keV band: 11.904000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.952 -1.092 27.860
T90 26.760 -0.016 26.744
T50 9.408 3.752 13.160
Peak 1.000 6.840 7.840
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.7565 +36.5523 0.0192 45.3 -21.6 1.0285 10.0 TRIG_00504215
------------------------------------------
Foreground time interval of the image:
-1.092 27.860 (delta_t = 28.952 [sec])
Background time interval of the image:
-239.200 -1.092 (delta_t = 238.108 [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 -1.092 sec. to 27.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03531 ( -0.313251 0.289528 )
Norm@50keV : 2.26178E-03 ( -0.000401266 0.000389242 )
------------------------------------------------------------
# Chi-Squared = 55.48 using 59 PHA bins.
# Reduced chi-squared = 0.9733 for 57 degrees of freedom
# Null hypothesis probability = 5.323740e-01
Photon flux (15-150 keV) in 28.95 sec: 0.260937 ( -0.0474368 0.0484266 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.99409e-07 ( -1.11053e-07 1.11226e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.092 sec. to 27.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05588 ( )
Epeak [keV] : 19.5937 ( )
Norm@50keV : 2.00594E-04 ( )
------------------------------------------------------------
# Chi-Squared = 54.89 using 59 PHA bins.
# Reduced chi-squared = 0.9801 for 56 degrees of freedom
# Null hypothesis probability = 5.171023e-01
Photon flux (15-150 keV) in 28.95 sec: 0.258494 ( -0.050342 0.050266 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.97047e-07 ( -1.1358e-07 1.12818e-07 ) ergs/cm2
Band function
Time interval is from -1.092 sec. to 27.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.877937 ( 0.877937 0.410092 )
beta : 10.00000 ( -2.04127e+12 -2.04127e+12 )
Epeak [keV] : 421.817 ( -421.817 -421.817 )
Norm@50keV : 5.55467E-22 ( -9.30055e-23 -5.55467e-22 )
------------------------------------------------------------
# Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.662909e-01
Photon flux (15-150 keV) in 28.95 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] : 25.2508 (-4.94336 7.16067)
R^2/D10^2 : 5.89582E-03 (-0.00319612 0.00610591)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.34 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.232501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.881e-08 7.164e-09
25- 50 1.072e-07 3.651e-08
50-150 5.062e-07 1.580e-07
15-150 6.322e-07 1.738e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 1.16836 (-1.16836 -1.16836)
------------------------------------------------------------
# Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.059733e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.423e-08 4.552e-08
25- 50 1.620e-07 8.770e-08
50-150 3.554e-07 1.954e-07
15-150 6.016e-07 3.310e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.33804 (-4.79464 8.98317)
R1^2/D10^2 : 0.107998 (-0.0946979 2.96032)
kT2 [keV] : 36.0619 (-11.4487 -36.0641)
R2^2/D10^2 : 1.72631E-03 (-0.0016859 0.00436508)
------------------------------------------------------------
# Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.678309e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.948e-08 2.954e-08
25- 50 1.356e-07 7.352e-08
50-150 5.205e-07 2.826e-07
15-150 7.055e-07 3.664e-07
Peak spectrum fit
Power-law model
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51782 ( -0.47774 0.472064 )
Norm@50keV : 6.96657E-03 ( -0.00196693 0.0019647 )
------------------------------------------------------------
# Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.930774e-01
Photon flux (15-150 keV) in 1 sec: 0.873901 ( -0.261331 0.265912 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.59027e-08 ( -1.93172e-08 1.9546e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.148654 ( -4.35787 1.90099 )
Epeak [keV] : 65.6509 ( -20.8345 -65.65 )
Norm@50keV : 4.55614E-02 ( -0.0455655 5.06461 )
------------------------------------------------------------
# Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.069414e-01
Photon flux (15-150 keV) in 1 sec: 0.808939 ( -0.273496 0.281421 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98245e-08 ( -2.03048e-08 2.16467e-08 ) ergs/cm2
Band function
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.146028 ( 0.499522 2.48782 )
beta : -10.00000 ( 9.83487e+08 9.83487e+08 )
Epeak [keV] : 65.6738 ( -20.8659 -65.6359 )
Norm@50keV : 4.54227E-02 ( -0.0455905 5.13421 )
------------------------------------------------------------
# Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.747615e-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] : 15.1491 (-3.79046 5.60212)
R^2/D10^2 : 0.100009 (-0.0687371 0.184759)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.30 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.244599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.797e-09 3.028e-09
25- 50 1.923e-08 1.111e-08
50-150 3.017e-08 1.946e-08
15-150 5.421e-08 2.818e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-199.723 -199.723)
Norm : 3.62086 (-1.01163 1.4307)
------------------------------------------------------------
# Chi-Squared = 61.75 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.102051e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.016e-09 5.190e-09
25- 50 1.734e-08 1.045e-08
50-150 3.804e-08 2.191e-08
15-150 6.440e-08 3.650e-08
Double BB
------------------------------------------------------------
# Chi-Squared = 60.63 using 59 PHA bins.
# Chi-Squared = 60.62 using 59 PHA bins.
# Chi-Squared = 60.37 using 59 PHA bins.
# Chi-Squared = 60.16 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.799316e-01
# Null hypothesis probability = 2.804601e-01
# Null hypothesis probability = 2.879857e-01
# Null hypothesis probability = 2.943059e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.902e-09 4.442e-09
25- 50 1.958e-08 1.557e-08
50-150 3.503e-08 2.492e-08
15-150 6.051e-08 4.190e-08
Plot creation:
Wed Sep 28 10:57:37 EDT 2011