batgrbproduct Analysis for Trigger=537921
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 9 11:12:01 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger537921/GCN5_download_cron
======================================================================
Trigger: 00537921 Segment: 000
BAT Trigger Time: 374089668.928 [s; MET]
Trigger Stop: 374089669.952 [s; MET]
UTC: 2012-11-08T17:47:39.076820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.1858158216827 Dec: 54.4907233392431 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.89
Image Trigger?: NO
Rate S/N Ratio: 12.9228479833201 [ if not an image trigger ]
Image S/N Ratio: 7.89
Flight Position: [ source = BAT ]
RA: 83.1858158216827 Dec: 54.4907233392431 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.2164200542205 Dec: 54.5197779966236 [deg; J2000]
{ 05h 32m 51.9s , +54d 31' 11.2" }
+/- 2.20988091535657 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09771820967861 [arcmin] (formal 1-sigma fit error)
SNR: 9.79857338393233
Angular difference between Flight and Ground position is 2.043469 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 89.5200000405312 +/- 47.5735213549265
Measured from: 0.952000141143799
to: 90.472000181675 [s; relative to TRIGTIME]
T50: 26.2239999771118 +/- 9.08814082072477
Measured from: 16.9680001735687
to: 43.1920001506805 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 43.1800000071526
to: 44.1800000071526 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.151999950408936
to: 137.976000010967 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.940700 0.822548 0.275099 -0.053971
0.067809 0.070037 0.062515 0.059383 [error]
Peak 0.063890 0.087198 0.040446 -0.001730
0.006718 0.007079 0.006059 0.005087 [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 2.70e-07 3.10e-07 2.55e-07 3.51e-07 9.62e-07 1.19e-06 erg/cm2
Error 3.28e-08 3.26e-08 5.16e-08 1.33e-07 1.19e-07 2.03e-07 erg/cm2
Peak flux Power-law 6.20e-01 5.26e-01 3.05e-01 2.63e-01 1.57e+00 1.71e+00 ph/cm2/s
Error 8.92e-02 5.36e-02 4.70e-02 7.61e-02 1.60e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 2.60e-07 3.51e-07 1.93e-07 8.34e-07 0.00e+00 0.00e+00 erg/cm2
Error 3.55e-08 4.47e-08 7.53e-08 1.28e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.51e-01 6.23e-01 2.92e-01 4.88e-02 1.51e+00 1.51e+00 ph/cm2/s
Error 1.00e-01 7.79e-02 6.14e-02 5.35e-02 1.61e-01 1.67e-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 2.282 0.197 - - 7.31e-04 1.08e-04 72.390 57
CPL 0.990 1.120 27.1 7.0 4.98e-03 1.78e-02 66.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.789 0.171 - - 1.14e-02 1.37e-03 69.670 57
CPL 0.357 0.933 46.9 10.8 7.88e-02 1.64e-01 59.730 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: 25.088000 sec.
T50 in the 50-300 keV band: 17.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 138.128 -0.152 137.976
T90 89.520 0.952 90.472
T50 26.224 16.968 43.192
Peak 1.000 43.180 44.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.2164 +54.5198 0.0197 11.7 72.7 0.3554 9.8 TRIG_00537921
------------------------------------------
Foreground time interval of the image:
-0.152 9.673 (delta_t = 9.825 [sec])
Background time interval of the image:
-239.928 -0.152 (delta_t = 239.776 [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 -0.152 sec. to 137.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28207 ( -0.191123 0.203283 )
Norm@50keV : 7.31261E-04 ( -0.000108733 0.000108035 )
------------------------------------------------------------
# Chi-Squared = 72.39 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.224500e-02
Photon flux (15-150 keV) in 138.1 sec: 0.126532 ( -0.0121855 0.0121873 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61927e-07 ( -1.1715e-07 1.21343e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.152 sec. to 137.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.990005 ( -1.28286 0.956393 )
Epeak [keV] : 27.0567 ( -8.41762 5.52852 )
Norm@50keV : 4.97625E-03 ( -0.00497813 0.0306574 )
------------------------------------------------------------
# Chi-Squared = 66.52 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 56 degrees of freedom
# Null hypothesis probability = 1.586763e-01
Photon flux (15-150 keV) in 138.1 sec: 0.121777 ( -0.012326 0.012436 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.34168e-07 ( -1.17505e-07 1.39303e-07 ) ergs/cm2
Band function
Time interval is from -0.152 sec. to 137.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98539 ( -142.707 -132.707 )
beta : -2.57353 ( -0.414178 0.27236 )
Epeak [keV] : 21.8427 ( -3.46739 3.26934 )
Norm@50keV : 383.205 ( -233.574 559.119 )
------------------------------------------------------------
# Chi-Squared = 65.37 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.597144e-01
Photon flux (15-150 keV) in 138.1 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] : 7.66273 (-0.782514 0.875114)
R^2/D10^2 : 0.166398 (-0.0591849 0.0922153)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 75.62 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 57 degrees of freedom
# Null hypothesis probability = 5.005270e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.359e-07 3.535e-08
25- 50 3.825e-07 4.896e-08
50-150 8.699e-08 2.819e-08
15-150 7.054e-07 9.798e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.5287 (-8.49088 12.1378)
Norm : 0.843382 (-0.148932 0.188376)
------------------------------------------------------------
# Chi-Squared = 66.77 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.765158e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.640e-07 3.425e-08
25- 50 3.417e-07 4.088e-08
50-150 2.536e-07 8.300e-08
15-150 8.592e-07 1.109e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.40670 (-1.86254 1.56237)
R1^2/D10^2 : 0.491569 (-0.278774 1.54333)
kT2 [keV] : 14.6652 (-5.29721 15.5947)
R2^2/D10^2 : 6.75090E-03 (-0.00631682 0.0134115)
------------------------------------------------------------
# Chi-Squared = 65.47 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 55 degrees of freedom
# Null hypothesis probability = 1.576941e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.656e-07 1.091e-07
25- 50 3.400e-07 1.565e-07
50-150 2.477e-07 1.556e-07
15-150 8.534e-07 4.306e-07
Peak spectrum fit
Power-law model
Time interval is from 43.180 sec. to 44.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78911 ( -0.168057 0.174305 )
Norm@50keV : 1.14073E-02 ( -0.00137502 0.00135577 )
------------------------------------------------------------
# Chi-Squared = 69.67 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.209712e-01
Photon flux (15-150 keV) in 1 sec: 1.56531 ( -0.159504 0.15951 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05058e-07 ( -1.28225e-08 1.30786e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.180 sec. to 44.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.356642 ( -1.0363 0.828999 )
Epeak [keV] : 46.9214 ( -7.40329 14.1098 )
Norm@50keV : 7.88194E-02 ( -0.0788203 0.249307 )
------------------------------------------------------------
# Chi-Squared = 59.73 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.417140e-01
Photon flux (15-150 keV) in 1 sec: 1.50650 ( -0.16073 0.16147 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37163e-08 ( -1.47829e-08 2.22317e-08 ) ergs/cm2
Band function
Time interval is from 43.180 sec. to 44.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96545 ( -67.2726 -57.2729 )
beta : -2.18175 ( -0.345218 0.260371 )
Epeak [keV] : 27.5169 ( -3.75223 3.60664 )
Norm@50keV : 884.578 ( -517.357 152.328 )
------------------------------------------------------------
# Chi-Squared = 57.35 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Null hypothesis probability = 3.880181e-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] : 10.6724 (-1.14606 1.30541)
R^2/D10^2 : 0.610098 (-0.214297 0.322087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.82 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.546208e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.442e-08 2.495e-09
25- 50 3.920e-08 4.875e-09
50-150 2.463e-08 6.760e-09
15-150 7.826e-08 1.058e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 88.0299 (-25.0269 44.6164)
Norm : 7.26611 (-0.970069 1.14549)
------------------------------------------------------------
# Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.660825e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.894e-08 2.785e-09
25- 50 3.189e-08 3.530e-09
50-150 4.789e-08 2.124e-08
15-150 9.872e-08 2.330e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.95450 (-2.07978 2.25658)
R1^2/D10^2 : 1.87111 (-1.01754 3.34649)
kT2 [keV] : 18.5337 (-14.2525 17.0263)
R2^2/D10^2 : 4.77955E-02 (-0.0441598 0.176262)
------------------------------------------------------------
# Chi-Squared = 57.71 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.755554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.770e-08 9.830e-09
25- 50 3.491e-08 1.598e-08
50-150 4.179e-08 2.373e-08
15-150 9.439e-08 4.882e-08
Plot creation:
Fri Nov 9 11:30:17 EST 2012