batgrbproduct Analysis for Trigger=519874
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 Apr 11 17:50:52 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger519874/GCN5_download_cron
======================================================================
Trigger: 00519874 Segment: 000
BAT Trigger Time: 355799807.124 [s; MET]
Trigger Stop: 355799807.188 [s; MET]
UTC: 2012-04-11T01:16:39.035760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 35.5498644098699 Dec: 59.7460747017891 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.51
Image Trigger?: NO
Rate S/N Ratio: 8.24621125123532 [ if not an image trigger ]
Image S/N Ratio: 6.51
Flight Position: [ source = BAT ]
RA: 35.5498644098699 Dec: 59.7460747017891 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 35.4756050320715 Dec: 59.7043954891285 [deg; J2000]
{ 02h 21m 54.1s , +59d 42' 15.8" }
+/- 4.97348853771839 [arcmin] (estimated 90% radius based on SNR)
+/- 3.59037669821794 [arcmin] (formal 1-sigma fit error)
SNR: 3.07530508682544
Angular difference between Flight and Ground position is 3.361465 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.003065 0.000451 0.004964 0.006846
0.001391 0.001411 0.001439 0.001623 [error]
Peak -0.003065 0.000451 0.004964 0.006846
0.001391 0.001411 0.001439 0.001623 [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 2.94e-12 2.23e-11 1.42e-10 4.67e-09 4.99e-10 0.00e+00 erg/cm2
Error 1.32e-10 2.04e-10 4.68e-10 2.01e-08 1.35e-09 0.00e+00 erg/cm2
Peak flux Power-law 0.00e+00 0.00e+00 0.00e+00 0.00e+00 1.98e-01 5.08e-02 ph/cm2/s
Error 7.29e-02 5.78e-02 6.33e-02 1.80e-01 7.98e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 7.29e-02 1.11e-01 5.04e-02 1.86e-01 2.60e+00 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 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 1.500 0.000 - - 0.00e+00 1.61e-03 76.890 57
CPL 2.645 0.000 50.2 0.0 2.98e-34 0.00e+00 76.870 56
The chi2 of BB fit is 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 1.500 0.000 - - 0.00e+00 1.61e-03 76.890 57
CPL 2.645 0.000 50.2 0.0 2.98e-34 0.00e+00 76.870 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
35.4756 +59.7044 0.0624 29.9 -164.0 0.0089 3.1 TRIG_00519874
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.124 -7.124 (delta_t = 53.000 [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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.003229 )
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
Photon flux (15-150 keV) in 0.064 sec: 5.07886E-02 ( -0.0508131 0.309733 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9918e-10 ( -4.9918e-10 2.19772e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64499 ( )
Epeak [keV] : 50.1615 ( )
Norm@50keV : 2.97788E-34 ( )
------------------------------------------------------------
# Chi-Squared = 76.87 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 56 degrees of freedom
# Null hypothesis probability = 3.357714e-02
Photon flux (15-150 keV) in 0.064 sec: 0.0 ( 0 0.372335 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38491 ( -1.18275 -1.18275 )
beta : -9.31756 ( 9.88904 9.88904 )
Epeak [keV] : 131.707 ( -132.002 -132.002 )
Norm@50keV : 5.03619E-03 ( -0.00496413 0.0719927 )
------------------------------------------------------------
# Chi-Squared = 76.62 using 59 PHA bins.
# Reduced chi-squared = 1.393 for 55 degrees of freedom
# Null hypothesis probability = 2.861244e-02
Photon flux (15-150 keV) in 0.064 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
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
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
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
Double BB
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Chi-Squared = 76.78 using 59 PHA bins.
# Chi-Squared = 76.75 using 59 PHA bins.
# Chi-Squared = 76.71 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 55 degrees of freedom
# Reduced chi-squared = 1.396 for 55 degrees of freedom
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Null hypothesis probability = 2.727034e-02
# Null hypothesis probability = 2.782391e-02
# Null hypothesis probability = 2.796792e-02
# Null hypothesis probability = 2.815070e-02
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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.003229 )
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
Photon flux (15-150 keV) in 0.064 sec: 5.07886E-02 ( -0.0508131 0.309733 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9918e-10 ( -4.9918e-10 2.19772e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64499 ( )
Epeak [keV] : 50.1615 ( )
Norm@50keV : 2.97788E-34 ( )
------------------------------------------------------------
# Chi-Squared = 76.87 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 56 degrees of freedom
# Null hypothesis probability = 3.357714e-02
Photon flux (15-150 keV) in 0.064 sec: 0.0 ( 0 0.372335 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38491 ( -1.18275 -1.18275 )
beta : -9.31756 ( 9.88904 9.88904 )
Epeak [keV] : 131.707 ( -132.002 -132.002 )
Norm@50keV : 5.03619E-03 ( -0.00496413 0.0719927 )
------------------------------------------------------------
# Chi-Squared = 76.62 using 59 PHA bins.
# Reduced chi-squared = 1.393 for 55 degrees of freedom
# Null hypothesis probability = 2.861244e-02
Photon flux (15-150 keV) in 0.064 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
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
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.069973e-02
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
Double BB
------------------------------------------------------------
# Chi-Squared = 76.89 using 59 PHA bins.
# Chi-Squared = 76.78 using 59 PHA bins.
# Chi-Squared = 76.75 using 59 PHA bins.
# Chi-Squared = 76.71 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 55 degrees of freedom
# Reduced chi-squared = 1.396 for 55 degrees of freedom
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Null hypothesis probability = 2.727034e-02
# Null hypothesis probability = 2.782391e-02
# Null hypothesis probability = 2.796792e-02
# Null hypothesis probability = 2.815070e-02
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:
Wed Apr 11 18:07:25 EDT 2012