batgrbproduct Analysis for Trigger=502415
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): Mon Sep 5 19:47:36 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger502415/GCN5_download_cron
======================================================================
Trigger: 00502415 Segment: 000
BAT Trigger Time: 336894528 [s; MET]
Trigger Stop: 336896128 [s; MET]
UTC: 2011-09-05T05:48:40.667280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.954169934877 Dec: -19.3179806799542 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.29
Flight Position: [ source = BAT ]
RA: 278.954169934877 Dec: -19.3179806799542 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.95772681511 Dec: -19.2687509498355 [deg; J2000]
{ 18h 35m 49.9s , -19d 16' 07.5" }
+/- 3.13524694512937 [arcmin] (estimated 90% radius based on SNR)
+/- 1.38360903669331 [arcmin] (formal 1-sigma fit error)
SNR: 5.94509408948367
Angular difference between Flight and Ground position is 2.960644 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1600 +/-
Measured from: 0
to: 1600 [s; relative to TRIGTIME]
T50: 1600 +/-
Measured from: 0
to: 1600 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1600 second)
Measured from: 0
to: 1600 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1600 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.467614 0.543960 0.324390 0.150678
0.105047 0.097868 0.085471 0.077516 [error]
Peak 0.467614 0.543960 0.324390 0.150678
0.105047 0.097868 0.085471 0.077516 [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 1.08e-07 1.95e-07 2.71e-07 7.87e-07 7.80e-07 1.36e-06 erg/cm2
Error 3.84e-08 4.31e-08 8.15e-08 5.19e-07 1.95e-07 5.84e-07 erg/cm2
Peak flux Power-law 9.53e-03 9.45e-03 6.57e-03 7.21e-03 2.84e-02 3.28e-02 ph/cm2/s
Error 3.46e-03 2.13e-03 1.91e-03 4.37e-03 6.16e-03 7.25e-03 ph/cm2/s
Fluence Cutoff-PL 1.06e-07 2.00e-07 2.72e-07 5.54e-07 7.63e-07 1.10e-06 erg/cm2
Error 4.11e-08 5.27e-08 8.60e-08 4.93e-07 2.25e-07 7.42e-07 erg/cm2
Peak flux Cutoff-PL 9.31e-03 9.66e-03 6.61e-03 5.47e-03 2.82e-02 3.10e-02 ph/cm2/s
Error 3.73e-03 2.50e-03 2.03e-03 6.15e-03 6.37e-03 8.82e-03 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 3.07e-02 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 1.525 0.392 - - 2.26e-04 5.12e-05 62.960 57
CPL 1.337 1.570 159.8 0.0 2.87e-04 1.67e-03 62.900 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.525 0.392 - - 2.26e-04 5.12e-05 62.960 57
CPL 1.337 1.570 159.8 0.0 2.87e-04 1.67e-03 62.900 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 1600.000 0.000 1600.000
T90 1600.000 0.000 1600.000
T50 1600.000 0.000 1600.000
Peak 1600.000 0.000 1600.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.9577 -19.2688 0.0323 10.5 165.1 1.4318 5.9 TRIG_00502415
------------------------------------------
Foreground time interval of the image:
592.000 603.065 (delta_t = 11.064 [sec])
609.000 963.075 (delta_t = 354.075 [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
592.000000 603.064500
609.000000 963.074800
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52506 ( -0.390433 0.39401 )
Norm@50keV : 2.26105E-04 ( -5.1755e-05 5.07353e-05 )
------------------------------------------------------------
# Chi-Squared = 62.96 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.737039e-01
Photon flux (15-150 keV) in 365.1 sec: 2.84213E-02 ( -0.00615185 0.00616376 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80018e-07 ( -1.91964e-07 1.98897e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
592.000000 603.064500
609.000000 963.074800
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33742 ( -1.85914 1.28157 )
Epeak [keV] : 159.833 ( -160.932 -160.932 )
Norm@50keV : 2.86563E-04 ( -0.000286161 0.00304396 )
------------------------------------------------------------
# Chi-Squared = 62.90 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.452600e-01
Photon flux (15-150 keV) in 365.1 sec: 2.81691E-02 ( -0.006408 0.0063384 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62665e-07 ( -2.35347e-07 2.13795e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
592.000000 603.064500
609.000000 963.074800
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98643 ( -142.765 -142.765 )
beta : -1.81756 ( -0.674829 0.517359 )
Epeak [keV] : 28.8383 ( -28.8419 8.96027 )
Norm@50keV : 10.7221 ( -10.7019 67.9058 )
------------------------------------------------------------
# Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.618708e-01
Photon flux (15-150 keV) in 365.1 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] : 11.6485 (-2.83753 4.79738)
R^2/D10^2 : 7.65742E-03 (-0.00542027 0.0137953)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.69 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.570612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.999e-08 4.287e-08
25- 50 2.430e-07 1.026e-07
50-150 1.942e-07 1.063e-07
15-150 5.172e-07 2.279e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.955 -199.955)
Norm : 0.115758 (-0.0247525 0.0325512)
------------------------------------------------------------
# Chi-Squared = 62.88 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.758494e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-07 6.083e-08
25- 50 2.024e-07 1.146e-07
50-150 4.440e-07 2.536e-07
15-150 7.517e-07 4.255e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.20380 (-2.58114 3.33929)
R1^2/D10^2 : 2.20346E-02 (-0.0154227 0.059865)
kT2 [keV] : 46.2196 (-25.8204 -45.2793)
R2^2/D10^2 : 5.87250E-05 (-6.02922e-05 0.000861946)
------------------------------------------------------------
# Chi-Squared = 60.51 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.837128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-07 6.433e-08
25- 50 2.199e-07 1.244e-07
50-150 4.769e-07 2.718e-07
15-150 8.018e-07 3.896e-07
Peak spectrum fit
Power-law model
Time interval is from 609.000 sec. to 963.075 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52506 ( -0.390433 0.39401 )
Norm@50keV : 2.26105E-04 ( -5.1755e-05 5.07353e-05 )
------------------------------------------------------------
# Chi-Squared = 62.96 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.737039e-01
Photon flux (15-150 keV) in 365.1 sec: 2.84213E-02 ( -0.00615185 0.00616376 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80018e-07 ( -1.91964e-07 1.98897e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 609.000 sec. to 963.075 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33742 ( -1.85914 1.28157 )
Epeak [keV] : 159.833 ( -160.932 -160.932 )
Norm@50keV : 2.86563E-04 ( -0.000286161 0.00304396 )
------------------------------------------------------------
# Chi-Squared = 62.90 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.452600e-01
Photon flux (15-150 keV) in 365.1 sec: 2.81691E-02 ( -0.006408 0.0063384 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62665e-07 ( -2.35347e-07 2.13317e-07 ) ergs/cm2
Band function
Time interval is from 609.000 sec. to 963.075 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98643 ( -142.765 -142.765 )
beta : -1.81756 ( -0.674829 0.517359 )
Epeak [keV] : 28.8383 ( -28.8419 8.96027 )
Norm@50keV : 10.7221 ( -10.7019 47.6666 )
------------------------------------------------------------
# Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.618708e-01
Photon flux (15-150 keV) in 365.1 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] : 11.6485 (-2.83753 4.79738)
R^2/D10^2 : 7.65742E-03 (-0.00542027 0.0137953)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.69 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.570612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.999e-08 3.362e-08
25- 50 2.430e-07 1.082e-07
50-150 1.942e-07 1.090e-07
15-150 5.172e-07 2.011e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.955 -199.955)
Norm : 0.115758 (-0.0247525 0.0325512)
------------------------------------------------------------
# Chi-Squared = 62.88 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.758494e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-07 5.947e-08
25- 50 2.024e-07 1.156e-07
50-150 4.440e-07 2.494e-07
15-150 7.517e-07 4.268e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.20380 (-2.58114 3.33929)
R1^2/D10^2 : 2.20346E-02 (-0.0154227 0.059865)
kT2 [keV] : 46.2196 (-25.8204 -45.2793)
R2^2/D10^2 : 5.87250E-05 (-6.02922e-05 0.000861946)
------------------------------------------------------------
# Chi-Squared = 60.51 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.837128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-07 6.320e-08
25- 50 2.199e-07 1.242e-07
50-150 4.769e-07 2.643e-07
15-150 8.018e-07 4.012e-07
Plot creation:
Mon Sep 5 19:53:39 EDT 2011