batgrbproduct Analysis for Trigger=519850
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 14:18:30 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger519850/GCN5_download_cron
======================================================================
Trigger: 00519850 Segment: 000
BAT Trigger Time: 355773600 [s; MET]
Trigger Stop: 355773664 [s; MET]
UTC: 2012-04-10T17:59:51.912820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.936516196583 Dec: -61.9721359286726 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.67
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.67
Flight Position: [ source = BAT ]
RA: 176.936516196583 Dec: -61.9721359286726 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 176.90658368963 Dec: -62.0213418179208 [deg; J2000]
{ 11h 47m 37.6s , -62d 01' 16.8" }
+/- 3.75258904130132 [arcmin] (estimated 90% radius based on SNR)
+/- 2.7190860260347 [arcmin] (formal 1-sigma fit error)
SNR: 4.59881050059493
Angular difference between Flight and Ground position is 3.070414 arcmin
Partial Coding Fraction: 0.9375 [ 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 0.168619 0.242788 0.053950 0.018198
0.046911 0.045010 0.038500 0.034007 [error]
Peak 0.168619 0.242788 0.053950 0.018198
0.046911 0.045010 0.038500 0.034007 [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 6.67e-08 8.24e-08 7.40e-08 1.15e-07 2.63e-07 3.38e-07 erg/cm2
Error 2.07e-08 2.09e-08 3.45e-08 1.07e-07 8.00e-08 1.50e-07 erg/cm2
Peak flux Power-law 3.41e-02 2.33e-02 1.05e-02 6.53e-03 7.11e-02 7.44e-02 ph/cm2/s
Error 1.08e-02 5.78e-03 4.73e-03 5.60e-03 1.70e-02 1.81e-02 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 3.26e-02 2.58e-02 9.30e-03 6.91e-02 6.94e-02 0.00e+00 ph/cm2/s
Error 1.20e-02 8.56e-03 7.57e-03 1.74e-02 1.98e-02 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 2.156 0.486 - - 4.39e-04 1.51e-04 44.970 57
CPL 1.251 2.367 30.1 0.0 1.63e-03 0.00e+00 44.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.156 0.486 - - 4.39e-04 1.51e-04 44.970 57
CPL 1.251 2.368 30.1 0.0 1.63e-03 0.00e+00 44.610 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
176.9066 -62.0213 0.0418 23.2 -6.3 0.4220 4.6 TRIG_00519850
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15590 ( -0.448907 0.524065 )
Norm@50keV : 4.39408E-04 ( -0.000153972 0.000147878 )
------------------------------------------------------------
# Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.7890 for 57 degrees of freedom
# Null hypothesis probability = 8.756923e-01
Photon flux (15-150 keV) in 64 sec: 7.11001E-02 ( -0.0169759 0.0169773 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62886e-07 ( -7.74214e-08 8.26208e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25149 ( -3.88027 0.853103 )
Epeak [keV] : 30.1062 ( )
Norm@50keV : 1.62970E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7967 for 56 degrees of freedom
# Null hypothesis probability = 8.632140e-01
Photon flux (15-150 keV) in 64 sec: 6.90604E-02 ( -0.0174188 0.0173196 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13802 ( 1.11445 1.11445 )
beta : -2.70481 ( 2.69541 0.940008 )
Epeak [keV] : 29.4627 ( -30.3716 43.7556 )
Norm@50keV : 1.97817E-03 ( -0.00139269 212.718 )
------------------------------------------------------------
# Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.8075 for 55 degrees of freedom
# Null hypothesis probability = 8.456130e-01
Photon flux (15-150 keV) in 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] : 8.47876 (-1.97509 2.52492)
R^2/D10^2 : 6.33193E-02 (-0.0409542 0.117765)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8118 for 57 degrees of freedom
# Null hypothesis probability = 8.442598e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.482e-08 2.462e-08
25- 50 1.059e-07 5.286e-08
50-150 3.354e-08 2.248e-08
15-150 1.942e-07 9.525e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.5519 (-21.7461 64.3207)
Norm : 0.421235 (-0.15093 0.262212)
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7826 for 57 degrees of freedom
# Null hypothesis probability = 8.836639e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.477e-08 2.516e-08
25- 50 9.062e-08 3.532e-08
50-150 8.211e-08 6.078e-08
15-150 2.375e-07 1.054e-07
Double BB
------------------------------------------------------------
# Chi-Squared = 44.77 using 59 PHA bins.
# Chi-Squared = 44.48 using 59 PHA bins.
# Chi-Squared = 44.44 using 59 PHA bins.
# Chi-Squared = 44.43 using 59 PHA bins.
# Reduced chi-squared = 0.8141 for 55 degrees of freedom
# Reduced chi-squared = 0.8088 for 55 degrees of freedom
# Reduced chi-squared = 0.8080 for 55 degrees of freedom
# Reduced chi-squared = 0.8078 for 55 degrees of freedom
# Null hypothesis probability = 8.360685e-01
# Null hypothesis probability = 8.438456e-01
# Null hypothesis probability = 8.448982e-01
# Null hypothesis probability = 8.452480e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.243e-08 3.086e-08
25- 50 9.696e-08 5.843e-08
50-150 5.038e-08 3.571e-08
15-150 2.098e-07 1.179e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15590 ( -0.448907 0.524065 )
Norm@50keV : 4.39408E-04 ( -0.000153972 0.000147878 )
------------------------------------------------------------
# Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.7890 for 57 degrees of freedom
# Null hypothesis probability = 8.756923e-01
Photon flux (15-150 keV) in 64 sec: 7.11001E-02 ( -0.0169759 0.0169773 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62886e-07 ( -7.74214e-08 8.26208e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25149 ( -3.88027 0.855236 )
Epeak [keV] : 30.1062 ( )
Norm@50keV : 1.62970E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7967 for 56 degrees of freedom
# Null hypothesis probability = 8.632140e-01
Photon flux (15-150 keV) in 64 sec: 6.90604E-02 ( -0.0174188 0.017319 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13802 ( 1.11445 1.11445 )
beta : -2.70481 ( 2.69541 0.940008 )
Epeak [keV] : 29.4627 ( -30.3716 43.7549 )
Norm@50keV : 1.97817E-03 ( -0.00139269 212.718 )
------------------------------------------------------------
# Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.8075 for 55 degrees of freedom
# Null hypothesis probability = 8.456130e-01
Photon flux (15-150 keV) in 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] : 8.47876 (-1.97509 2.52492)
R^2/D10^2 : 6.33193E-02 (-0.0409542 0.117765)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8118 for 57 degrees of freedom
# Null hypothesis probability = 8.442598e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.482e-08 2.724e-08
25- 50 1.059e-07 4.813e-08
50-150 3.354e-08 2.335e-08
15-150 1.942e-07 9.717e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.5519 (-21.7461 64.3207)
Norm : 0.421235 (-0.15093 0.262212)
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7826 for 57 degrees of freedom
# Null hypothesis probability = 8.836639e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.477e-08 2.352e-08
25- 50 9.062e-08 3.778e-08
50-150 8.211e-08 5.647e-08
15-150 2.375e-07 1.072e-07
Double BB
------------------------------------------------------------
# Chi-Squared = 44.77 using 59 PHA bins.
# Chi-Squared = 44.48 using 59 PHA bins.
# Chi-Squared = 44.44 using 59 PHA bins.
# Chi-Squared = 44.43 using 59 PHA bins.
# Reduced chi-squared = 0.8141 for 55 degrees of freedom
# Reduced chi-squared = 0.8088 for 55 degrees of freedom
# Reduced chi-squared = 0.8080 for 55 degrees of freedom
# Reduced chi-squared = 0.8078 for 55 degrees of freedom
# Null hypothesis probability = 8.360685e-01
# Null hypothesis probability = 8.438456e-01
# Null hypothesis probability = 8.448982e-01
# Null hypothesis probability = 8.452480e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.243e-08 2.759e-08
25- 50 9.696e-08 5.718e-08
50-150 5.038e-08 3.472e-08
15-150 2.098e-07 1.165e-07
Plot creation:
Wed Apr 11 14:36:05 EDT 2012