batgrbproduct Analysis for Trigger=537266
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): Fri Nov 2 15:48:49 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger537266/GCN5_download_cron
======================================================================
Trigger: 00537266 Segment: 000
BAT Trigger Time: 373516032.512 [s; MET]
Trigger Stop: 373516033.536 [s; MET]
UTC: 2012-11-02T02:27:02.685320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.902873735498 Dec: -16.9658028054735 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 14.8996644257513 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 270.902873735498 Dec: -16.9658028054735 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.896714518896 Dec: -16.9511108475022 [deg; J2000]
{ 18h 03m 35.2s , -16d 57' 04.0" }
+/- 0.735539805699496 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264280842805424 [arcmin] (formal 1-sigma fit error)
SNR: 47.1716403809175
Angular difference between Flight and Ground position is 0.949749 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 27.2079999446869 +/- 3.66699060026766
Measured from: 1.49200010299683
to: 28.7000000476837 [s; relative to TRIGTIME]
T50: 8.93999993801117 +/- 0.67029550704509
Measured from: 5.01600009202957
to: 13.9560000300407 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.67599999904633
to: 6.67599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 40.3479999899864 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.276769 1.396144 0.757463 0.074066
0.042761 0.040165 0.033314 0.027757 [error]
Peak 0.078539 0.119515 0.077117 0.013358
0.007374 0.007407 0.006096 0.004492 [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 3.80e-07 5.47e-07 5.84e-07 1.16e-06 1.87e-06 2.67e-06 erg/cm2
Error 2.47e-08 2.09e-08 3.32e-08 1.41e-07 7.59e-08 1.67e-07 erg/cm2
Peak flux Power-law 8.06e-01 7.68e-01 5.09e-01 5.25e-01 2.30e+00 2.61e+00 ph/cm2/s
Error 9.56e-02 5.81e-02 4.85e-02 9.90e-02 1.69e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 3.59e-07 5.64e-07 5.85e-07 6.57e-07 2.17e-06 0.00e+00 erg/cm2
Error 2.99e-08 2.52e-08 3.50e-08 3.01e-07 3.18e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.15e-01 8.32e-01 5.33e-01 2.26e-01 2.23e+00 2.31e+00 ph/cm2/s
Error 1.11e-01 7.29e-02 5.50e-02 1.24e-01 1.75e-01 2.11e-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 2.31e+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 1.905 0.074 - - 5.01e-03 2.05e-04 40.720 57
CPL 1.541 0.307 58.9 30.7 7.76e-03 2.90e-03 36.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.593 0.122 - - 1.79e-02 1.36e-03 67.080 57
CPL 0.813 0.535 72.5 29.9 4.61e-02 3.25e-02 59.630 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: 12.608000 sec.
T50 in the 50-300 keV band: 6.528000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 40.644 -0.296 40.348
T90 27.208 1.492 28.700
T50 8.940 5.016 13.956
Peak 1.000 5.676 6.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.8967 -16.9511 0.0041 6.0 -132.2 2.1737 47.2 TRIG_00537266
------------------------------------------
Foreground time interval of the image:
-0.296 10.889 (delta_t = 11.185 [sec])
Background time interval of the image:
-60.512 -0.296 (delta_t = 60.216 [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 -0.296 sec. to 40.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90473 ( -0.0738132 0.074581 )
Norm@50keV : 5.00631E-03 ( -0.00020537 0.000204262 )
------------------------------------------------------------
# Chi-Squared = 40.72 using 59 PHA bins.
# Reduced chi-squared = 0.7143 for 57 degrees of freedom
# Null hypothesis probability = 9.491244e-01
Photon flux (15-150 keV) in 40.64 sec: 0.719904 ( -0.0287804 0.0288717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8706e-06 ( -7.57542e-08 7.60817e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 40.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54094 ( -0.318035 0.295222 )
Epeak [keV] : 58.9401 ( -10.84 50.5681 )
Norm@50keV : 7.75506E-03 ( -0.00226727 0.00353937 )
------------------------------------------------------------
# Chi-Squared = 36.22 using 59 PHA bins.
# Reduced chi-squared = 0.6468 for 56 degrees of freedom
# Null hypothesis probability = 9.814395e-01
Photon flux (15-150 keV) in 40.64 sec: 0.701243 ( -0.032185 0.032263 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16503e-06 ( -2.49412e-07 3.85828e-07 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 40.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.891187 ( -0.670768 1.06452 )
beta : -2.04828 ( 2.05073 0.139263 )
Epeak [keV] : 38.6043 ( -13.9178 36.4439 )
Norm@50keV : 2.09396E-02 ( -0.0135327 487.688 )
------------------------------------------------------------
# Chi-Squared = 34.59 using 59 PHA bins.
# Reduced chi-squared = 0.6289 for 55 degrees of freedom
# Null hypothesis probability = 9.857949e-01
Photon flux (15-150 keV) in 40.64 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] : 11.8037 ( )
R^2/D10^2 : 0.170288 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 174.53 using 59 PHA bins.
# Reduced chi-squared = 3.0619 for 57 degrees of freedom
# Null hypothesis probability = 7.534996e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.036e-07 1.512e-08
25- 50 6.284e-07 2.703e-08
50-150 5.206e-07 4.389e-08
15-150 1.353e-06 5.547e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 86.5249 (-11.1813 14.0219)
Norm : 3.22655 (-0.200334 0.218691)
------------------------------------------------------------
# Chi-Squared = 37.64 using 59 PHA bins.
# Reduced chi-squared = 0.6604 for 57 degrees of freedom
# Null hypothesis probability = 9.776405e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.417e-07 2.091e-08
25- 50 5.728e-07 2.134e-08
50-150 8.511e-07 7.722e-08
15-150 1.766e-06 8.453e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.47294 (-0.789638 0.840019)
R1^2/D10^2 : 1.15757 (-0.400793 0.707915)
kT2 [keV] : 21.8735 (-2.88514 4.12697)
R2^2/D10^2 : 1.21606E-02 (-0.00593291 0.00938301)
------------------------------------------------------------
# Chi-Squared = 37.40 using 59 PHA bins.
# Reduced chi-squared = 0.6801 for 55 degrees of freedom
# Null hypothesis probability = 9.667039e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.337e-07 4.375e-08
25- 50 5.706e-07 5.791e-08
50-150 8.684e-07 1.577e-07
15-150 1.773e-06 1.888e-07
Peak spectrum fit
Power-law model
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59298 ( -0.121343 0.122629 )
Norm@50keV : 1.79124E-02 ( -0.00136113 0.00135408 )
------------------------------------------------------------
# Chi-Squared = 67.08 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.697247e-01
Photon flux (15-150 keV) in 1 sec: 2.29684 ( -0.169293 0.169456 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67664e-07 ( -1.36293e-08 1.37303e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.812991 ( -0.566725 0.502728 )
Epeak [keV] : 72.4689 ( -14.0296 45.7985 )
Norm@50keV : 4.60810E-02 ( -0.0206163 0.0443159 )
------------------------------------------------------------
# Chi-Squared = 59.63 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.450568e-01
Photon flux (15-150 keV) in 1 sec: 2.22964 ( -0.17446 0.17457 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81923e-07 ( -2.8407e-08 4.9219e-08 ) ergs/cm2
Band function
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.812747 ( -0.397301 0.442633 )
beta : -10.00000 ( 2.93389e+11 2.93389e+11 )
Epeak [keV] : 72.4504 ( -14.0236 45.7967 )
Norm@50keV : 4.60918E-02 ( -0.0206302 0.0443341 )
------------------------------------------------------------
# Chi-Squared = 59.63 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 55 degrees of freedom
# Null hypothesis probability = 3.110300e-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] : 13.6042 (-1.1952 1.32417)
R^2/D10^2 : 0.367572 (-0.104956 0.145026)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 91.05 using 59 PHA bins.
# Reduced chi-squared = 1.597 for 57 degrees of freedom
# Null hypothesis probability = 2.791048e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.440e-08 1.775e-09
25- 50 5.204e-08 4.975e-09
50-150 6.246e-08 9.510e-09
15-150 1.289e-07 1.160e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.600 (14.5709 -101.609)
Norm : 9.50551 (-0.745976 0.853432)
------------------------------------------------------------
# Chi-Squared = 61.77 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.097431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.420e-08 2.585e-09
25- 50 4.545e-08 3.850e-09
50-150 9.310e-08 1.298e-08
15-150 1.628e-07 1.395e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.29415 (-1.42417 1.62427)
R1^2/D10^2 : 2.09931 (-0.974066 2.14814)
kT2 [keV] : 23.5503 (-4.47642 7.99569)
R2^2/D10^2 : 3.72192E-02 (-0.0249073 0.0258264)
------------------------------------------------------------
# Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.436012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.239e-08 7.324e-09
25- 50 4.801e-08 1.369e-08
50-150 8.942e-08 4.286e-08
15-150 1.598e-07 5.392e-08
Plot creation:
Fri Nov 2 15:57:02 EDT 2012