batgrbproduct Analysis for Trigger=505516
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): Sat Oct 15 14:51:54 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger505516/GCN5_download_cron
======================================================================
Trigger: 00505516 Segment: 000
BAT Trigger Time: 340333968 [s; MET]
Trigger Stop: 340334032 [s; MET]
UTC: 2011-10-15T01:12:40.532120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.215496981894 Dec: -28.0913859568875 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 265.215496981894 Dec: -28.0913859568875 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.208760041102 Dec: -28.0904924263295 [deg; J2000]
{ 17h 40m 50.1s , -28d 05' 25.8" }
+/- 3.24819606002415 [arcmin] (estimated 90% radius based on SNR)
+/- 1.59700325059743 [arcmin] (formal 1-sigma fit error)
SNR: 5.65198370507143
Angular difference between Flight and Ground position is 0.360608 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 890.432000041008 +/- 53.2668908660368
Measured from: 34.4080001115799
to: 924.840000152588 [s; relative to TRIGTIME]
T50: 861.37600004673 +/- 661.777730508391
Measured from: 38.3120000958443
to: 899.688000142574 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -29.8040000200272
to: -28.8040000200272 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.783999979496
to: 933.480000019073 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.167881 1.101908 0.558923 0.123978
0.192682 0.172888 0.147708 0.131507 [error]
Peak 0.012763 0.023200 0.003621 0.008773
0.006524 0.005725 0.004835 0.004453 [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 1.58e-07 3.10e-07 4.72e-07 1.57e-06 1.32e-06 2.49e-06 erg/cm2
Error 6.09e-08 7.93e-08 1.34e-07 9.10e-07 3.41e-07 1.02e-06 erg/cm2
Peak flux Power-law 2.05e-01 1.12e-01 3.85e-02 1.72e-02 3.65e-01 3.72e-01 ph/cm2/s
Error 9.85e-02 5.10e-02 3.35e-02 3.15e-02 1.41e-01 1.46e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-07 4.79e-07 3.44e-07 1.42e-08 9.37e-07 9.36e-07 erg/cm2
Error 6.34e-08 1.34e-07 2.94e-07 1.05e-07 3.06e-07 3.18e-07 erg/cm2
Peak flux Cutoff-PL 1.81e-01 1.38e-01 2.25e-02 4.20e-04 3.43e-01 3.45e-01 ph/cm2/s
Error 1.50e-01 1.15e-01 3.71e-02 2.89e-02 1.57e-01 1.66e-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 3.73e-01 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 1.398 0.358 - - 1.42e-04 3.42e-05 95.810 57
CPL -2.845 2.799 47.7 12.7 3.55e-02 5.92e+01 84.610 56
The chi2 of BB fit is 85.65 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 2.543 0.999 - - 1.81e-03 1.22e-03 46.740 57
CPL 0.672 0.000 24.1 0.0 2.91e-02 0.00e+00 46.450 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 963.264 -29.784 933.480
T90 890.432 34.408 924.840
T50 861.376 38.312 899.688
Peak 1.000 -29.804 -28.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.2088 -28.0905 0.0340 20.7 19.9 0.7676 5.7 TRIG_00505516
------------------------------------------
Foreground time interval of the image:
-29.784 72.901 (delta_t = 102.685 [sec])
Background time interval of the image:
-239.000 -29.784 (delta_t = 209.216 [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
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39841 ( -0.359493 0.35678 )
Norm@50keV : 1.42163E-04 ( -3.42493e-05 3.42411e-05 )
------------------------------------------------------------
# Chi-Squared = 95.81 using 59 PHA bins.
# Reduced chi-squared = 1.681 for 57 degrees of freedom
# Null hypothesis probability = 9.865871e-04
Photon flux (15-150 keV) in 962.2 sec: 1.72911E-02 ( -0.00422141 0.00426556 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32405e-06 ( -3.36946e-07 3.45799e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.84498 ( -3.03688 2.5617 )
Epeak [keV] : 47.6627 ( -9.47324 15.9221 )
Norm@50keV : 3.54867E-02 ( -0.0418639 118.419 )
------------------------------------------------------------
# Chi-Squared = 84.61 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 56 degrees of freedom
# Null hypothesis probability = 8.068343e-03
Photon flux (15-150 keV) in 962.2 sec: 1.53483E-02 ( -0.003886 0.0041563 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37354e-07 ( -2.61538e-07 3.50454e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99975 ( -7714.38 -7699.39 )
beta : -2.72612 ( 2.72562 0.970395 )
Epeak [keV] : 40.1589 ( -8.58969 8.93898 )
Norm@50keV : 1.07994 ( -1.08045 3.55156 )
------------------------------------------------------------
# Chi-Squared = 82.32 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 55 degrees of freedom
# Null hypothesis probability = 9.941048e-03
Photon flux (15-150 keV) in 962.2 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] : 13.2036 (-2.50758 3.44358)
R^2/D10^2 : 3.49277E-03 (-0.0020076 0.0040648)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 85.65 using 59 PHA bins.
# Reduced chi-squared = 1.503 for 57 degrees of freedom
# Null hypothesis probability = 8.379581e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 6.021e-08
25- 50 4.350e-07 1.734e-07
50-150 4.838e-07 2.501e-07
15-150 1.043e-06 4.088e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-117.845 -199.993)
Norm : 7.29851E-02 (-0.0172061 0.019516)
------------------------------------------------------------
# Chi-Squared = 94.20 using 59 PHA bins.
# Reduced chi-squared = 1.653 for 57 degrees of freedom
# Null hypothesis probability = 1.412322e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.749e-07 1.005e-07
25- 50 3.364e-07 1.891e-07
50-150 7.378e-07 4.282e-07
15-150 1.249e-06 7.231e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.00000E-04 ( )
R1^2/D10^2 : 3.47526E-07 (-3.47526e-07 -3.47526e-07)
kT2 [keV] : 13.2033 (-2.50729 3.44387)
R2^2/D10^2 : 3.49304E-03 (-0.00200787 0.00406453)
------------------------------------------------------------
# Chi-Squared = 85.77 using 59 PHA bins.
# Chi-Squared = 85.65 using 59 PHA bins.
# Reduced chi-squared = 1.559 for 55 degrees of freedom
# Reduced chi-squared = 1.557 for 55 degrees of freedom
# Null hypothesis probability = 4.980631e-03
# Null hypothesis probability = 5.107929e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.339e-07 8.453e-08
25- 50 4.459e-07 2.611e-07
50-150 4.403e-07 3.051e-07
15-150 1.020e-06 5.999e-07
Peak spectrum fit
Power-law model
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54326 ( -0.795053 1.20223 )
Norm@50keV : 1.80712E-03 ( -0.00121713 0.00121593 )
------------------------------------------------------------
# Chi-Squared = 46.74 using 59 PHA bins.
# Reduced chi-squared = 0.8200 for 57 degrees of freedom
# Null hypothesis probability = 8.320626e-01
Photon flux (15-150 keV) in 1 sec: 0.364621 ( -0.141277 0.141366 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82892e-08 ( -8.54216e-09 9.69947e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.672377 ( )
Epeak [keV] : 24.0934 ( )
Norm@50keV : 2.90785E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8294 for 56 degrees of freedom
# Null hypothesis probability = 8.148124e-01
Photon flux (15-150 keV) in 1 sec: 0.342957 ( -0.162926 0.151117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54333e-08 ( -7.44944e-09 1.1866e-08 ) ergs/cm2
Band function
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.59949 ( -1.59171 -1.59171 )
beta : -3.73962 ( 3.73899 1.94015 )
Epeak [keV] : 27.6119 ( -27.6009 16.3254 )
Norm@50keV : 1.01493 ( -0.968807 120.948 )
------------------------------------------------------------
# Chi-Squared = 46.39 using 59 PHA bins.
# Reduced chi-squared = 0.8435 for 55 degrees of freedom
# Null hypothesis probability = 7.890599e-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] : 7.31317 (-2.26147 3.32483)
R^2/D10^2 : 0.589484 (-0.589484 2.19966)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.42 using 59 PHA bins.
# Reduced chi-squared = 0.8144 for 57 degrees of freedom
# Null hypothesis probability = 8.405071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.288e-09 3.430e-09
25- 50 7.872e-09 4.937e-09
50-150 1.524e-09 1.299e-09
15-150 1.468e-08 9.390e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.9389 (-17.4461 71.2729)
Norm : 2.94325 (-1.68377 4.83119)
------------------------------------------------------------
# Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8157 for 57 degrees of freedom
# Null hypothesis probability = 8.384543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.984e-09 3.807e-09
25- 50 6.830e-09 4.476e-09
50-150 3.730e-09 3.362e-09
15-150 1.654e-08 1.100e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.884511 (-1.09282 1.2796)
R1^2/D10^2 : 3.11315E+06 ( )
kT2 [keV] : 8.22715 (-2.56845 4.47881)
R2^2/D10^2 : 0.327804 (-0.274347 0.473235)
------------------------------------------------------------
# Chi-Squared = 42.97 using 59 PHA bins.
# Chi-Squared = 42.79 using 59 PHA bins.
# Reduced chi-squared = 0.7813 for 55 degrees of freedom
# Reduced chi-squared = 0.7780 for 55 degrees of freedom
# Null hypothesis probability = 8.806146e-01
# Null hypothesis probability = 8.846277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.297e-09 2.661e-09
25- 50 7.438e-09 4.749e-09
50-150 2.239e-09 1.695e-09
15-150 1.498e-08 9.025e-09
Plot creation:
Sat Oct 15 15:08:48 EDT 2011