batgrbproduct Analysis for Trigger=531223
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 Aug 17 19:48:12 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger531223/GCN5_download_cron
======================================================================
Trigger: 00531223 Segment: 000
BAT Trigger Time: 366837524.288 [s; MET]
Trigger Stop: 366837528.384 [s; MET]
UTC: 2012-08-16T19:18:34.743480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.126089347899 Dec: -6.9789643544855 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.94
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 6.94
Flight Position: [ source = BAT ]
RA: 282.126089347899 Dec: -6.9789643544855 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.133993324253 Dec: -6.98112027538595 [deg; J2000]
{ 18h 48m 32.2s , -06d 58' 52.0" }
+/- 2.51998069547305 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19798723251827 [arcmin] (formal 1-sigma fit error)
SNR: 8.12257609741014
Angular difference between Flight and Ground position is 0.488174 arcmin
Partial Coding Fraction: 0.09277344 [ including projection effects ]
Duration
T90: 7.63200002908707 +/- 3.11554551524619
Measured from: -1.53599989414215
to: 6.09600013494492 [s; relative to TRIGTIME]
T50: 2.04800003767014 +/- 1.31582369437348
Measured from: 1.77600014209747
to: 3.82400017976761 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.819999992847443
to: 1.81999999284744 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.98399996757507
to: 6.65600001811981 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.339397 0.346400 0.091668 0.019691
0.056792 0.056602 0.046981 0.040668 [error]
Peak 0.043558 0.112593 0.044494 0.010953
0.019457 0.019682 0.016976 0.014016 [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 1.47e-07 1.44e-07 9.83e-08 1.05e-07 4.32e-07 4.95e-07 erg/cm2
Error 3.38e-08 3.08e-08 4.03e-08 8.09e-08 9.87e-08 1.44e-07 erg/cm2
Peak flux Power-law 8.96e-01 6.90e-01 3.56e-01 2.64e-01 2.06e+00 2.21e+00 ph/cm2/s
Error 3.39e-01 1.77e-01 1.23e-01 1.75e-01 5.40e-01 5.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.36e-07 1.73e-07 7.87e-08 9.33e-09 3.97e-07 0.00e+00 erg/cm2
Error 3.84e-08 4.41e-08 4.88e-08 5.91e-08 1.10e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.95e-01 8.30e-01 3.76e-01 5.06e-02 1.94e+00 1.95e+00 ph/cm2/s
Error 4.17e-01 2.45e-01 1.70e-01 1.87e-01 5.69e-01 5.87e-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 2.551 0.398 - - 4.93e-03 1.51e-03 46.210 57
CPL 0.823 2.021 25.1 0.0 5.85e-02 0.00e+00 43.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.956 0.424 - - 1.40e-02 3.90e-03 58.670 57
CPL 0.124 3.182 46.1 0.0 1.39e-01 1.92e+01 56.900 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 8.640 -1.984 6.656
T90 7.632 -1.536 6.096
T50 2.048 1.776 3.824
Peak 1.000 0.820 1.820
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.1340 -6.9811 0.0238 46.7 141.6 0.9561 8.1 TRIG_00531223
------------------------------------------
Foreground time interval of the image:
-1.984 6.656 (delta_t = 8.640 [sec])
Background time interval of the image:
-60.288 -1.984 (delta_t = 58.304 [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 -1.984 sec. to 6.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55066 ( -0.363354 0.431975 )
Norm@50keV : 4.93124E-03 ( -0.0015196 0.00149426 )
------------------------------------------------------------
# Chi-Squared = 46.21 using 59 PHA bins.
# Reduced chi-squared = 0.8106 for 57 degrees of freedom
# Null hypothesis probability = 8.459777e-01
Photon flux (15-150 keV) in 8.64 sec: 0.999588 ( -0.188641 0.188641 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32112e-07 ( -9.65079e-08 1.00799e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.984 sec. to 6.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.823148 ( -2.55858 1.48256 )
Epeak [keV] : 25.1282 ( )
Norm@50keV : 5.85166E-02 ( )
------------------------------------------------------------
# Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7778 for 56 degrees of freedom
# Null hypothesis probability = 8.872939e-01
Photon flux (15-150 keV) in 8.64 sec: 0.969863 ( -0.189054 0.189667 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96994e-07 ( -8.75742e-08 1.32988e-07 ) ergs/cm2
Band function
Time interval is from -1.984 sec. to 6.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.824413 ( 0.824384 2.55914 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 25.1219 ( -12.79 10.9043 )
Norm@50keV : 5.83881E-02 ( -0.0584044 25520.5 )
------------------------------------------------------------
# Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7919 for 55 degrees of freedom
# Null hypothesis probability = 8.671432e-01
Photon flux (15-150 keV) in 8.64 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] : 7.89264 (-1.4782 1.70658)
R^2/D10^2 : 1.18180 (-0.656443 1.59793)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.09 using 59 PHA bins.
# Reduced chi-squared = 0.8086 for 57 degrees of freedom
# Null hypothesis probability = 8.489626e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.138e-07 4.069e-08
25- 50 1.946e-07 6.648e-08
50-150 4.887e-08 2.755e-08
15-150 3.573e-07 1.169e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.8398 (-10.6021 17.4807)
Norm : 7.75743 (-2.44958 3.88268)
------------------------------------------------------------
# Chi-Squared = 43.76 using 59 PHA bins.
# Reduced chi-squared = 0.7677 for 57 degrees of freedom
# Null hypothesis probability = 9.010977e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.405e-07 3.568e-08
25- 50 1.657e-07 4.959e-08
50-150 9.799e-08 5.925e-08
15-150 4.042e-07 1.235e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.42068 (-2.29571 4.53433)
R1^2/D10^2 : 145.946 (-181.976 -183.244)
kT2 [keV] : 9.31612 (-2.09527 6.4963)
R2^2/D10^2 : 0.526942 (-0.530895 1.14214)
------------------------------------------------------------
# Chi-Squared = 42.50 using 59 PHA bins.
# Reduced chi-squared = 0.7727 for 55 degrees of freedom
# Null hypothesis probability = 8.909890e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.328e-07 6.467e-08
25- 50 1.789e-07 9.850e-08
50-150 7.428e-08 5.072e-08
15-150 3.859e-07 2.023e-07
Peak spectrum fit
Power-law model
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95558 ( -0.405071 0.44315 )
Norm@50keV : 1.40369E-02 ( -0.00395614 0.00383892 )
------------------------------------------------------------
# Chi-Squared = 58.67 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.140606e-01
Photon flux (15-150 keV) in 1 sec: 2.06366 ( -0.53846 0.541381 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29201e-07 ( -3.47711e-08 3.5218e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.123865 ( -4.31092 2.05367 )
Epeak [keV] : 46.1262 ( -46.0504 -46.0504 )
Norm@50keV : 0.139029 ( -0.14646 38.3292 )
------------------------------------------------------------
# Chi-Squared = 56.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 56 degrees of freedom
# Null hypothesis probability = 4.412570e-01
Photon flux (15-150 keV) in 1 sec: 1.94435 ( -0.56925 0.56876 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18917e-07 ( -3.75259e-08 1.03051e-07 ) ergs/cm2
Band function
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.121974 ( -0.172493 -0.172493 )
beta : -2.95968 ( 2.93534 1.15937 )
Epeak [keV] : 43.7784 ( -43.2567 20.0061 )
Norm@50keV : 0.201970 ( -0.260309 145.821 )
------------------------------------------------------------
# Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.145545e-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] : 11.3719 (-2.531 3.27437)
R^2/D10^2 : 0.631865 (-0.399214 1.03018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.543660e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.717e-08 9.293e-09
25- 50 5.065e-08 2.630e-08
50-150 3.793e-08 2.229e-08
15-150 1.058e-07 4.311e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.3780 (-34.8699 114.523)
Norm : 10.1194 (-3.38112 4.81751)
------------------------------------------------------------
# Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.553119e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.611e-08 8.920e-09
25- 50 4.222e-08 1.497e-08
50-150 5.667e-08 4.267e-08
15-150 1.250e-07 5.474e-08
Double BB
R1^2/D10^2 : 6.22144E+14 ( )
kT2 [keV] : 11.8800 (-2.6356 3.46263)
R2^2/D10^2 : 0.520022 (-0.331059 0.815711)
------------------------------------------------------------
# Chi-Squared = 53.85 using 59 PHA bins.
# Chi-Squared = 53.36 using 59 PHA bins.
# Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9791 for 55 degrees of freedom
# Reduced chi-squared = 0.9702 for 55 degrees of freedom
# Reduced chi-squared = 0.9700 for 55 degrees of freedom
# Null hypothesis probability = 5.186770e-01
# Null hypothesis probability = 5.375329e-01
# Null hypothesis probability = 5.379884e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.953e-08 8.740e-09
25- 50 4.729e-08 2.445e-08
50-150 4.166e-08 2.485e-08
15-150 1.085e-07 6.106e-08
Plot creation:
Fri Aug 17 19:55:34 EDT 2012