batgrbproduct Analysis for Trigger=531428
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 Aug 20 19:49:19 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger531428/GCN5_download_cron
======================================================================
Trigger: 00531428 Segment: 000
BAT Trigger Time: 367074624 [s; MET]
Trigger Stop: 367074696 [s; MET]
UTC: 2012-08-19T13:10:14.445520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.887635135529 Dec: -7.30488686709695 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 235.887635135529 Dec: -7.30488686709695 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.886570244931 Dec: -7.30375202857007 [deg; J2000]
{ 15h 43m 32.8s , -07d 18' 13.5" }
+/- 2.93821057210376 [arcmin] (estimated 90% radius based on SNR)
+/- 1.50558263659601 [arcmin] (formal 1-sigma fit error)
SNR: 6.52271643232368
Angular difference between Flight and Ground position is 0.093020 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 71.0519999265671 +/- 20.7585596945888
Measured from: 5.56800013780594
to: 76.620000064373 [s; relative to TRIGTIME]
T50: 17.4839999079704 +/- 17.1465292044637
Measured from: 14.1000001430511
to: 31.5840000510216 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.19599997997284
to: 7.19599997997284 [s; relative to TRIGTIME]
Total Fluence
Measured from: 4.4200000166893
to: 82.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.433564 0.797035 0.591896 0.226112
0.107003 0.096720 0.082522 0.074071 [error]
Peak 0.020375 0.021140 0.041304 0.022410
0.012480 0.011546 0.010347 0.009224 [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 1.86e-07 3.44e-07 4.91e-07 1.48e-06 1.40e-06 2.50e-06 erg/cm2
Error 4.37e-08 4.94e-08 8.09e-08 5.31e-07 1.99e-07 5.87e-07 erg/cm2
Peak flux Power-law 1.38e-01 2.13e-01 2.47e-01 5.53e-01 7.61e-01 1.15e+00 ph/cm2/s
Error 1.20e-01 1.12e-01 7.95e-02 4.36e-01 2.81e-01 4.18e-01 ph/cm2/s
Fluence Cutoff-PL 3.06e-07 6.06e-07 9.15e-07 2.75e-06 4.58e-06 0.00e+00 erg/cm2
Error 8.63e-08 9.32e-08 1.52e-07 2.07e-06 1.68e-06 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.17e-01 2.08e-01 2.58e-01 4.24e-01 7.42e-01 1.01e+00 ph/cm2/s
Error 1.40e-01 1.64e-01 1.05e-01 5.42e-01 3.05e-01 4.55e-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 1.52e-01 2.25e-01 1.14e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.52e-01 5.32e-01 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 1.486 0.228 - - 1.88e-03 2.49e-04 48.670 57
CPL 0.487 1.271 74.7 -27.2 5.99e-03 1.65e-02 46.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.784 0.688 - - 6.62e-03 2.59e-03 61.210 57
CPL 0.409 2.398 296.9 0.0 8.92e-03 3.42e-01 61.160 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: 41.216000 sec.
T50 in the 50-300 keV band: 21.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 78.460 4.420 82.880
T90 71.052 5.568 76.620
T50 17.484 14.100 31.584
Peak 1.000 6.196 7.196
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.8866 -7.3038 0.0296 36.0 -63.7 1.7258 6.5 TRIG_00531428
------------------------------------------
Foreground time interval of the image:
4.420 81.501 (delta_t = 77.081 [sec])
Background time interval of the image:
-60.000 -22.760 (delta_t = 37.240 [sec])
-22.000 4.420 (delta_t = 26.420 [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 4.420 sec. to 82.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48594 ( -0.228953 0.227676 )
Norm@50keV : 1.87741E-03 ( -0.000248872 0.000248436 )
------------------------------------------------------------
# Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8538 for 57 degrees of freedom
# Null hypothesis probability = 7.759484e-01
Photon flux (15-150 keV) in 78.46 sec: 0.233500 ( -0.0322143 0.0323989 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40064e-06 ( -1.98212e-07 2.00176e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.420 sec. to 82.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.487379 ( -1.48302 1.05953 )
Epeak [keV] : 74.7156 ( -20.3983 -74.7024 )
Norm@50keV : 5.99044E-03 ( -0.00599373 0.0269737 )
------------------------------------------------------------
# Chi-Squared = 46.18 using 59 PHA bins.
# Reduced chi-squared = 0.8247 for 56 degrees of freedom
# Null hypothesis probability = 8.223153e-01
Photon flux (15-150 keV) in 78.46 sec: 0.221938 ( -0.034934 0.034814 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57637e-06 ( -1.92571e-06 1.439e-06 ) ergs/cm2
Band function
Time interval is from 4.420 sec. to 82.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.29032E-02 ( -1.40255 3.01381 )
beta : -2.07967 ( 2.07943 0.609573 )
Epeak [keV] : 59.8890 ( -32.2216 79.0064 )
Norm@50keV : 1.25857E-02 ( -0.0140925 24.8083 )
------------------------------------------------------------
# Chi-Squared = 44.99 using 59 PHA bins.
# Reduced chi-squared = 0.8179 for 55 degrees of freedom
# Null hypothesis probability = 8.302342e-01
Photon flux (15-150 keV) in 78.46 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] : 14.6354 (-2.00373 2.46686)
R^2/D10^2 : 2.93010E-02 (-0.0126312 0.0207134)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 50.66 using 59 PHA bins.
# Reduced chi-squared = 0.8888 for 57 degrees of freedom
# Null hypothesis probability = 7.102988e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.035e-07 2.892e-08
25- 50 4.018e-07 8.293e-08
50-150 5.792e-07 1.506e-07
15-150 1.084e-06 2.001e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.9361 -199.992)
Norm : 0.963730 (-0.12622 0.126346)
------------------------------------------------------------
# Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 57 degrees of freedom
# Null hypothesis probability = 8.096709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.883e-07 1.013e-07
25- 50 3.622e-07 1.951e-07
50-150 7.943e-07 4.268e-07
15-150 1.345e-06 7.363e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.1099 (-4.28207 2.39368)
R1^2/D10^2 : 5.08699E-02 (-0.023292 0.0437281)
kT2 [keV] : 194.100 (-125.478 -125.478)
R2^2/D10^2 : 2.07349E-05 (-1.16e-05 0.00635461)
------------------------------------------------------------
# Chi-Squared = 44.09 using 59 PHA bins.
# Reduced chi-squared = 0.8017 for 55 degrees of freedom
# Null hypothesis probability = 8.538796e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-07 5.519e-08
25- 50 4.112e-07 1.738e-07
50-150 7.654e-07 2.430e-07
15-150 1.303e-06 4.112e-07
Peak spectrum fit
Power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.783989 ( -0.753074 0.622856 )
Norm@50keV : 6.61813E-03 ( -0.00270398 0.00247128 )
------------------------------------------------------------
# Chi-Squared = 61.21 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.274303e-01
Photon flux (15-150 keV) in 1 sec: 0.761143 ( -0.274254 0.287378 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78641e-08 ( -2.53963e-08 2.55039e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.408839 ( -5.20405 -0.408472 )
Epeak [keV] : 296.921 ( -296.72 -296.72 )
Norm@50keV : 8.92022E-03 ( -0.00481682 0.679818 )
------------------------------------------------------------
# Chi-Squared = 61.16 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.960774e-01
Photon flux (15-150 keV) in 1 sec: 0.742228 ( -0.3104 0.298702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74049e-07 ( -1.74049e-07 2.52621e-07 ) ergs/cm2
Band function
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.798630 ( 0.799734 0.799734 )
beta : -0.783989 ( -0.623094 0.753093 )
Epeak [keV] : 14.9477 ( -14.9418 -14.9418 )
Norm@50keV : 9.82175E-03 ( -0.00567115 0 )
------------------------------------------------------------
# Chi-Squared = 61.21 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.629975e-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] : 30.0668 (-10.4012 27.4743)
R^2/D10^2 : 1.12157E-02 (-0.0112157 0.0299598)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.143467e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.584e-09 1.026e-09
25- 50 9.780e-09 5.950e-09
50-150 6.240e-08 3.903e-08
15-150 7.377e-08 4.657e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.999 ( )
Norm : 3.35978 (-3.35978 -3.35978)
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.010534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.366e-09 4.922e-09
25- 50 1.609e-08 9.625e-09
50-150 3.529e-08 2.175e-08
15-150 5.975e-08 3.578e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.01802 (-4.81701 55.9058)
R1^2/D10^2 : 1.76744 (-1.91312 25.6265)
kT2 [keV] : 34.2399 (-13.0306 -34.2358)
R2^2/D10^2 : 7.36833E-03 (-0.00735747 0.0221356)
------------------------------------------------------------
# Chi-Squared = 60.37 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Null hypothesis probability = 2.879664e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.602e-09 3.802e-09
25- 50 1.093e-08 5.875e-09
50-150 6.272e-08 3.704e-08
15-150 7.925e-08 4.478e-08
Plot creation:
Mon Aug 20 19:58:56 EDT 2012