batgrbproduct Analysis for Trigger=509018
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 Dec 5 08:17:53 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger509018/GCN5_download_cron
======================================================================
Trigger: 00509018 Segment: 000
BAT Trigger Time: 344698656 [s; MET]
Trigger Stop: 344698720 [s; MET]
UTC: 2011-12-04T13:37:28.359180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.641463053206 Dec: -31.3949607281387 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 336.641463053206 Dec: -31.3949607281387 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.651133989742 Dec: -31.4139848623171 [deg; J2000]
{ 22h 26m 36.3s , -31d 24' 50.3" }
+/- 2.17662534906349 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21796159634654 [arcmin] (formal 1-sigma fit error)
SNR: 10.0131393896176
Angular difference between Flight and Ground position is 1.244259 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: 33.0000001192093
to: 81.0000001192093 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 33.0000001192093
to: 65.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 56.5
to: 57.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 33
to: 81 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.269991 0.307550 0.180567 0.030418
0.042419 0.044352 0.039712 0.035963 [error]
Peak 0.011697 0.015280 0.004035 -0.001983
0.006173 0.006634 0.005749 0.005416 [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 8.88e-08 1.33e-07 1.49e-07 3.16e-07 4.66e-07 6.86e-07 erg/cm2
Error 2.02e-08 2.07e-08 3.92e-08 1.69e-07 9.01e-08 2.09e-07 erg/cm2
Peak flux Power-law 1.28e-01 8.79e-02 3.94e-02 2.45e-02 2.68e-01 2.80e-01 ph/cm2/s
Error 9.17e-02 7.07e-02 4.30e-02 5.78e-02 1.57e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 8.82e-08 1.33e-07 1.49e-07 3.13e-07 4.67e-07 6.14e-07 erg/cm2
Error 2.08e-08 2.40e-08 4.00e-08 2.56e-07 7.39e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.21e-01 1.21e-01 6.22e-03 1.50e-06 2.48e-01 2.48e-01 ph/cm2/s
Error 1.01e-01 1.04e-01 3.91e-02 2.34e-02 1.47e-01 1.47e-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 1.837 0.297 - - 1.05e-03 2.01e-04 54.200 57
CPL 2.010 0.000 4.7 0.0 8.42e-04 0.00e+00 54.190 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.158 1.336 - - 1.65e-03 1.35e-03 62.570 57
CPL -1.825 0.000 29.5 0.0 8.99e-01 0.00e+00 61.780 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: 9.472000 sec.
T50 in the 50-300 keV band: 5.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 33.000 81.000
T90 48.000 33.000 81.000
T50 32.000 33.000 65.000
Peak 1.000 56.500 57.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.6511 -31.4140 0.0193 31.5 -155.3 0.7593 10.0 TRIG_00509018
------------------------------------------
Foreground time interval of the image:
33.000 70.601 (delta_t = 37.601 [sec])
Background time interval of the image:
-239.000 33.000 (delta_t = 272.000 [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 33.000 sec. to 81.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83711 ( -0.286709 0.307629 )
Norm@50keV : 1.05496E-03 ( -0.000205315 0.000197538 )
------------------------------------------------------------
# Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 57 degrees of freedom
# Null hypothesis probability = 5.806927e-01
Photon flux (15-150 keV) in 48 sec: 0.147515 ( -0.0229171 0.0229198 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65704e-07 ( -8.86882e-08 9.14669e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.000 sec. to 81.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01039 ( )
Epeak [keV] : 4.66777 ( )
Norm@50keV : 8.41881E-04 ( )
------------------------------------------------------------
# Chi-Squared = 54.19 using 59 PHA bins.
# Reduced chi-squared = 0.9678 for 56 degrees of freedom
# Null hypothesis probability = 5.434955e-01
Photon flux (15-150 keV) in 48 sec: 0.147482 ( -0.022892 0.022887 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67275e-07 ( -1.02217e-07 4.54997e-08 ) ergs/cm2
Band function
Time interval is from 33.000 sec. to 81.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.56278 ( 0.910953 5.81699 )
beta : -1.90532 ( 1.90769 0.347862 )
Epeak [keV] : 23.2248 ( -27.3876 344.259 )
Norm@50keV : 0.531578 ( -0.526142 180.719 )
------------------------------------------------------------
# Chi-Squared = 53.99 using 59 PHA bins.
# Reduced chi-squared = 0.9816 for 55 degrees of freedom
# Null hypothesis probability = 5.133349e-01
Photon flux (15-150 keV) in 48 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] : 9.81272 (-1.86999 2.48578)
R^2/D10^2 : 7.26603E-02 (-0.0412781 0.0891013)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.786408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.793e-08 2.291e-08
25- 50 1.644e-07 4.553e-08
50-150 8.122e-08 3.641e-08
15-150 3.136e-07 7.589e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.9924 (-41.1089 -92.9924)
Norm : 0.661587 (-0.134412 0.190631)
------------------------------------------------------------
# Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9638 for 57 degrees of freedom
# Null hypothesis probability = 5.527879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.293e-08 1.925e-08
25- 50 1.413e-07 2.938e-08
50-150 2.194e-07 1.390e-07
15-150 4.436e-07 1.616e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.39013 (-1.90776 2.13372)
R1^2/D10^2 : 0.290387 (-0.188766 0.82161)
kT2 [keV] : 29.2513 (-11.9754 42.2339)
R2^2/D10^2 : 1.02036E-03 (-0.000934632 0.00572558)
------------------------------------------------------------
# Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9656 for 55 degrees of freedom
# Null hypothesis probability = 5.473482e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.900e-08 5.129e-08
25- 50 1.345e-07 7.081e-08
50-150 2.590e-07 1.502e-07
15-150 4.825e-07 2.518e-07
Peak spectrum fit
Power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15833 ( -1.08272 1.58866 )
Norm@50keV : 1.65194E-03 ( -0.00132764 0.00136261 )
------------------------------------------------------------
# Chi-Squared = 62.57 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.851400e-01
Photon flux (15-150 keV) in 1 sec: 0.267637 ( -0.156305 0.157138 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54483e-08 ( -1.03404e-08 1.26054e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.82524 ( )
Epeak [keV] : 29.4894 ( )
Norm@50keV : 0.899000 ( )
------------------------------------------------------------
# Chi-Squared = 61.78 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.771963e-01
Photon flux (15-150 keV) in 1 sec: 0.248298 ( -0.142899 0.151093 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08335e-08 ( -6.51602e-09 1.47477e-08 ) ergs/cm2
Band function
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99415 ( -328.227 -328.227 )
beta : -3.50136 ( 3.50269 2.08242 )
Epeak [keV] : 27.3501 ( -27.3535 14.5566 )
Norm@50keV : 212.850 ( -211.76 3576.54 )
------------------------------------------------------------
# Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.559480e-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] : 7.52297 (-3.24185 6.05405)
R^2/D10^2 : 0.409726 (-0.409726 3.50507)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.81 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.084431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.990e-09 2.572e-09
25- 50 6.259e-09 4.479e-09
50-150 1.337e-09 1.302e-09
15-150 1.159e-08 8.045e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.0845 (-40.0843 -40.0843)
Norm : 1.76153 (-1.76157 4.75614)
------------------------------------------------------------
# Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.935998e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.048e-09 2.821e-09
25- 50 5.330e-09 3.881e-09
50-150 4.133e-09 4.261e-09
15-150 1.351e-08 1.085e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.291 ( )
R1^2/D10^2 : 1.88922E-05 (-1.88993e-05 -1.88993e-05)
kT2 [keV] : 7.15154 (-7.15156 5.78761)
R2^2/D10^2 : 0.482710 (-0.482835 4.59418)
------------------------------------------------------------
# Chi-Squared = 61.81 using 59 PHA bins.
# Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.460223e-01
# Null hypothesis probability = 2.549998e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.981e-09 2.419e-05
25- 50 6.206e-09 2.121e-04
50-150 1.392e-09 4.898e-03
15-150 1.158e-08 4.875e-03
Plot creation:
Mon Dec 5 08:39:47 EST 2011