batgrbproduct Analysis for Trigger=536502
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): Tue Oct 23 16:06:46 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger536502/GCN5_download_cron
======================================================================
Trigger: 00536502 Segment: 000
BAT Trigger Time: 372622096 [s; MET]
Trigger Stop: 372622160 [s; MET]
UTC: 2012-10-22T18:08:06.211480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.514964409207 Dec: -17.0953412624424 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.81
Flight Position: [ source = BAT ]
RA: 274.514964409207 Dec: -17.0953412624424 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.422089830933 Dec: -17.1418618426101 [deg; J2000]
{ 18h 17m 41.3s , -17d 08' 30.7" }
+/- 4.01870184773982 [arcmin] (estimated 90% radius based on SNR)
+/- 2.34848995147156 [arcmin] (formal 1-sigma fit error)
SNR: 4.17002525200181
Angular difference between Flight and Ground position is 6.012737 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 160 +/- 35.7770876399966
Measured from: -70.9999998807907
to: 89.0000001192093 [s; relative to TRIGTIME]
T50: 96 +/- 35.7770876399966
Measured from: -54.9999998807907
to: 41.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -63.5
to: -62.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71
to: 105 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.500635 1.042675 0.220547 0.111701
0.110186 0.107020 0.093623 0.086108 [error]
Peak 0.002471 -0.000033 0.003630 0.013744
0.008655 0.008733 0.007571 0.007283 [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 1.93e-07 2.85e-07 3.14e-07 6.52e-07 9.91e-07 1.45e-06 erg/cm2
Error 4.23e-08 4.70e-08 8.08e-08 3.23e-07 1.95e-07 4.17e-07 erg/cm2
Peak flux Power-law 3.73e-04 2.83e-03 1.90e-02 6.74e-01 6.78e-02 6.95e-01 ph/cm2/s
Error 7.81e-02 4.14e-02 4.44e-02 7.41e-01 1.28e-01 7.67e-01 ph/cm2/s
Fluence Cutoff-PL 1.16e-07 4.63e-07 1.57e-07 9.68e-10 7.37e-07 0.00e+00 erg/cm2
Error 5.40e-08 7.82e-08 8.87e-08 6.09e-09 1.34e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.59e-05 3.72e-04 8.01e-03 1.88e+00 4.96e-02 8.53e-01 ph/cm2/s
Error 5.65e-02 3.73e-02 4.16e-02 1.96e+00 1.17e-01 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.000 0.000 0.0 0.0 0.00e+00 0.00e+00 0.000 0
The chi2 of BB fit is 67.68 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.000 0.000 0.0 0.0 0.00e+00 0.00e+00 0.000 0
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 176.000 -71.000 105.000
T90 160.000 -71.000 89.000
T50 96.000 -55.000 41.000
Peak 1.000 -63.500 -62.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.4221 -17.1419 0.0460 16.1 58.3 1.9224 4.2 TRIG_00536502
------------------------------------------
Foreground time interval of the image:
-71.000 -56.963 (delta_t = 14.037 [sec])
-56.000 52.360 (delta_t = 108.360 [sec])
53.000 105.000 (delta_t = 52.000 [sec])
Background time interval of the image:
-119.000 -71.000 (delta_t = 48.000 [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
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -56.963300
-56.000000 52.360000
53.000000 105.000000
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in sec: 8.72673E-02 ( -0.0143294 0.0143302 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -56.963300
-56.000000 52.360000
53.000000 105.000000
XSPEC: quit
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in sec: 7.64082E-02 ( -0.0137925 0.0140751 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -56.963300
-56.000000 52.360000
53.000000 105.000000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 10.2357 (-1.213 1.40599)
R^2/D10^2 : 4.27601E-02 (-0.016865 0.0264276)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.68 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.573467e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.603e-07 4.301e-08
25- 50 4.118e-07 8.589e-08
50-150 2.298e-07 9.247e-08
15-150 8.019e-07 1.745e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.1477 (-23.2858 48.8564)
Norm : 0.449385 (-0.0970655 0.119072)
------------------------------------------------------------
# Chi-Squared = 82.96 using 59 PHA bins.
# Reduced chi-squared = 1.455 for 57 degrees of freedom
# Null hypothesis probability = 1.398584e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.001e-07 4.510e-08
25- 50 3.148e-07 7.028e-08
50-150 3.918e-07 2.194e-07
15-150 9.067e-07 2.602e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.141191 (-0.141191 -0.141191)
R1^2/D10^2 : 3.30031E-02 (-0.0330031 -0.0330031)
kT2 [keV] : 10.2353 (-1.21306 1.40594)
R2^2/D10^2 : 4.27657E-02 (-0.016864 0.0264286)
------------------------------------------------------------
# Chi-Squared = 67.68 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.171504e-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
Peak spectrum fit
Power-law model
Time interval is from -63.500 sec. to -62.500 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in sec: 6.78496E-02 ( -0.0678496 0.18887 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -63.500 sec. to -62.500 sec.
XSPEC: quit
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in sec: 4.95876E-02 ( -0.0495876 0.184703 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58742e-13 ( 0 0 ) ergs/cm2
Band function
Time interval is from -63.500 sec. to -62.500 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 0.673389 (-0.814148 2.27862)
R^2/D10^2 : 3.73958E+08 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 53.76 using 59 PHA bins.
# Reduced chi-squared = 0.9431 for 57 degrees of freedom
# Null hypothesis probability = 5.974763e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.799e-10 6.220e-11
25- 50 1.509e-14 3.911e-17
50-150 0.000e+00 0.000e+00
15-150 6.799e-10 6.210e-11
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 0.775687 ( )
Norm : 1.19628E+08 ( )
------------------------------------------------------------
# Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9424 for 57 degrees of freedom
# Null hypothesis probability = 5.991249e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.477e-10 7.660e-11
25- 50 2.389e-14 2.317e-15
50-150 1.117e-25 0.000e+00
15-150 6.477e-10 4.945e-11
Double BB
R1^2/D10^2 : 4.33543E+15 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 5.30387E-05 (-5.30388e-05 7.01407e-05)
------------------------------------------------------------
# Chi-Squared = 55.52 using 59 PHA bins.
# Chi-Squared = 52.05 using 59 PHA bins.
# Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Reduced chi-squared = 0.9463 for 55 degrees of freedom
# Reduced chi-squared = 0.9426 for 55 degrees of freedom
# Null hypothesis probability = 4.551880e-01
# Null hypothesis probability = 5.881618e-01
# Null hypothesis probability = 5.960338e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.905e-11 7.765e+09
25- 50 5.866e-10 6.895e+10
50-150 1.428e-08 1.598e+12
15-150 1.493e-08 1.482e+12
Plot creation:
Tue Oct 23 16:26:52 EDT 2012