batgrbproduct Analysis for Trigger=503434
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 19 00:29:53 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger503434/GCN5_download_cron
======================================================================
Trigger: 00503434 Segment: 000
BAT Trigger Time: 338033256 [s; MET]
Trigger Stop: 338033320 [s; MET]
UTC: 2011-09-18T10:07:28.622600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.894207240101 Dec: -2.63191211929983 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.72
Flight Position: [ source = BAT ]
RA: 283.894207240101 Dec: -2.63191211929983 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.831314729932 Dec: -2.65169494067602 [deg; J2000]
{ 18h 55m 19.5s , -02d 39' 06.1" }
+/- 3.05600209765632 [arcmin] (estimated 90% radius based on SNR)
+/- 1.5531781299941 [arcmin] (formal 1-sigma fit error)
SNR: 6.16654265563652
Angular difference between Flight and Ground position is 3.952003 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 797.527999997139 +/- 85.564158584063
Measured from: -6.45199990272522
to: 791.076000094414 [s; relative to TRIGTIME]
T50: 470.863999962807 +/- 73.9994154505753
Measured from: 99.8760001063347
to: 570.740000069141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 46.6639999747276
to: 47.6639999747276 [s; relative to TRIGTIME]
Total Fluence
Measured from: -65.6840000152588
to: 825.124000012875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.857667 3.646772 0.788188 0.282496
0.166169 0.152911 0.130081 0.115352 [error]
Peak 0.007001 0.018920 0.011162 0.012288
0.005496 0.005175 0.004440 0.004016 [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 1.24e-06 1.27e-06 9.10e-07 1.04e-06 3.83e-06 4.46e-06 erg/cm2
Error 9.58e-08 7.62e-08 1.06e-07 2.30e-07 2.49e-07 3.74e-07 erg/cm2
Peak flux Power-law 9.76e-02 9.83e-02 6.96e-02 7.84e-02 2.96e-01 3.44e-01 ph/cm2/s
Error 6.07e-02 4.01e-02 3.41e-02 9.22e-02 1.16e-01 1.35e-01 ph/cm2/s
Fluence Cutoff-PL 1.09e-06 1.51e-06 5.63e-07 3.31e-08 3.19e-06 3.20e-06 erg/cm2
Error 1.11e-07 1.05e-07 1.49e-07 4.63e-08 2.42e-07 2.45e-07 erg/cm2
Peak flux Cutoff-PL 6.78e-02 1.23e-01 6.85e-02 7.24e-03 2.66e-01 2.67e-01 ph/cm2/s
Error 7.38e-02 6.07e-02 5.66e-02 7.46e-02 1.22e-01 1.49e-01 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 2.478 0.119 - - 4.33e-04 3.66e-05 103.200 57
CPL 0.104 0.867 27.8 3.3 1.37e-02 2.73e-02 67.370 56
The chi2 of BB fit is 76.31 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 1.498 0.678 - - 2.37e-03 9.51e-04 57.100 57
CPL -0.974 0.995 53.4 0.0 5.10e-02 0.00e+00 55.900 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 890.808 -65.684 825.124
T90 797.528 -6.452 791.076
T50 470.864 99.876 570.740
Peak 1.000 46.664 47.664
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.8313 -2.6517 0.0311 8.0 36.2 4.8897 6.2 TRIG_00503434
------------------------------------------
Foreground time interval of the image:
-65.684 -65.530 (delta_t = 0.154 [sec])
-65.000 -56.734 (delta_t = 8.266 [sec])
-56.000 825.124 (delta_t = 881.124 [sec])
Background time interval of the image:
-209.799 -65.684 (delta_t = 144.115 [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
Multiple GTIs in the spectrum
tstart tstop
-65.684000 -65.530000
-65.000000 -56.733600
-56.000000 825.124000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47845 ( -0.117119 0.12108 )
Norm@50keV : 4.32807E-04 ( -3.66121e-05 3.65222e-05 )
------------------------------------------------------------
# Chi-Squared = 103.20 using 59 PHA bins.
# Reduced chi-squared = 1.8106 for 57 degrees of freedom
# Null hypothesis probability = 1.747247e-04
Photon flux (15-150 keV) in 889.5 sec: 8.39139E-02 ( -0.00485809 0.00486266 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82771e-06 ( -2.47631e-07 2.51015e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-65.684000 -65.530000
-65.000000 -56.733600
-56.000000 825.124000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.104481 ( -0.934072 0.799324 )
Epeak [keV] : 27.8347 ( -3.94907 2.72655 )
Norm@50keV : 1.36579E-02 ( -0.0136593 0.0410211 )
------------------------------------------------------------
# Chi-Squared = 67.37 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 56 degrees of freedom
# Null hypothesis probability = 1.420798e-01
Photon flux (15-150 keV) in 889.5 sec: 7.70609E-02 ( -0.0051243 0.0051488 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19418e-06 ( -2.33716e-07 2.50857e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-65.684000 -65.530000
-65.000000 -56.733600
-56.000000 825.124000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.248757 ( -0.760468 0.724 )
beta : -3.90598 ( 10 19.9996 )
Epeak [keV] : 27.8884 ( -3.90734 2.76378 )
Norm@50keV : 2.41964E-02 ( -0.0240504 0.705949 )
------------------------------------------------------------
# Chi-Squared = 67.11 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Null hypothesis probability = 1.267381e-01
Photon flux (15-150 keV) in 889.5 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] : 7.70323 (-0.429571 0.456025)
R^2/D10^2 : 0.104943 (-0.0228832 0.0293202)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 76.31 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 57 degrees of freedom
# Null hypothesis probability = 4.478655e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.725e-07 9.535e-08
25- 50 1.592e-06 1.045e-07
50-150 3.686e-07 8.054e-08
15-150 2.933e-06 1.846e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.2458 (-3.88566 4.64501)
Norm : 0.631767 (-0.0746191 0.0860861)
------------------------------------------------------------
# Chi-Squared = 74.40 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.068669e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.185e-06 9.251e-08
25- 50 1.407e-06 8.895e-08
50-150 8.453e-07 1.606e-07
15-150 3.437e-06 2.202e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.56847 (-2.12301 1.51067)
R1^2/D10^2 : 0.245406 (-0.106977 0.683882)
kT2 [keV] : 11.1747 (-8.1251 12.2016)
R2^2/D10^2 : 1.22101E-02 (-0.0088459 0.0174126)
------------------------------------------------------------
# Chi-Squared = 66.70 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 55 degrees of freedom
# Null hypothesis probability = 1.340425e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.086e-06 4.677e-07
25- 50 1.496e-06 6.743e-07
50-150 6.305e-07 3.393e-07
15-150 3.213e-06 1.361e-06
Peak spectrum fit
Power-law model
Time interval is from 46.664 sec. to 47.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49816 ( -0.670876 0.684608 )
Norm@50keV : 2.37497E-03 ( -0.000960913 0.000941453 )
------------------------------------------------------------
# Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.714147e-01
Photon flux (15-150 keV) in 1 sec: 0.296343 ( -0.115409 0.116017 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25371e-08 ( -9.55094e-09 1.00513e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 46.664 sec. to 47.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.973755 ( 1.05132 3.04122 )
Epeak [keV] : 53.3546 ( )
Norm@50keV : 5.10419E-02 ( )
------------------------------------------------------------
# Chi-Squared = 55.90 using 59 PHA bins.
# Reduced chi-squared = 0.9982 for 56 degrees of freedom
# Null hypothesis probability = 4.787093e-01
Photon flux (15-150 keV) in 1 sec: 0.266109 ( -0.118505 0.125416 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78395e-08 ( -8.52297e-09 1.2186e-08 ) ergs/cm2
Band function
Time interval is from 46.664 sec. to 47.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99829 ( -1122 -1122 )
beta : -2.40477 ( 2.40439 1.54903 )
Epeak [keV] : 39.6061 ( -39.5956 17.9885 )
Norm@50keV : 17.8107 ( -17.8406 1.81243e+06 )
------------------------------------------------------------
# Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.594568e-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] : 13.1530 (-4.14882 7.31043)
R^2/D10^2 : 5.63809E-02 (-0.0563809 0.164861)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.93 using 59 PHA bins.
# Reduced chi-squared = 0.9813 for 57 degrees of freedom
# Null hypothesis probability = 5.151028e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.068e-09 1.314e-09
25- 50 7.213e-09 4.392e-09
50-150 7.943e-09 5.570e-09
15-150 1.723e-08 1.095e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.118 (-118.619 -163.624)
Norm : 1.22154 (-0.466605 0.728006)
------------------------------------------------------------
# Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 0.9963 for 57 degrees of freedom
# Null hypothesis probability = 4.828560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.042e-09 1.848e-09
25- 50 5.851e-09 3.657e-09
50-150 1.283e-08 8.125e-09
15-150 2.172e-08 1.313e-08
Double BB
------------------------------------------------------------
# Chi-Squared = 55.93 using 59 PHA bins.
# Chi-Squared = 55.92 using 59 PHA bins.
# Chi-Squared = 55.79 using 59 PHA bins.
# Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.395546e-01
# Null hypothesis probability = 4.402650e-01
# Null hypothesis probability = 4.449973e-01
# Null hypothesis probability = 4.455509e-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:
Mon Sep 19 00:49:05 EDT 2011