batgrbproduct Analysis for Trigger=505801
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): Wed Oct 19 10:12:34 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger505801/GCN5_download_cron
======================================================================
Trigger: 00505801 Segment: 000
BAT Trigger Time: 340651592 [s; MET]
Trigger Stop: 340651656 [s; MET]
UTC: 2011-10-18T17:26:24.519600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.500387190674 Dec: -3.8713557158467 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.53
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.53
Flight Position: [ source = BAT ]
RA: 271.500387190674 Dec: -3.8713557158467 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.481558798215 Dec: -3.88013472698288 [deg; J2000]
{ 18h 05m 55.6s , -03d 52' 48.5" }
+/- 2.04955105827082 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23674613636685 [arcmin] (formal 1-sigma fit error)
SNR: 10.9116796137211
Angular difference between Flight and Ground position is 1.244128 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 36.5359999537468 +/- 4.21558724832551
Measured from: -0.583999872207642
to: 35.9520000815392 [s; relative to TRIGTIME]
T50: 24.4319999814034 +/- 14.0117672229288
Measured from: 4.28000009059906
to: 28.7120000720024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.7120000123978
to: 22.7120000123978 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.0799999833107
to: 37.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.309583 0.359287 0.124180 0.018191
0.040323 0.039111 0.033198 0.028692 [error]
Peak 0.014295 0.028636 0.008238 0.005292
0.006361 0.006236 0.005113 0.004423 [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 1.03e-07 1.26e-07 1.12e-07 1.71e-07 4.01e-07 5.12e-07 erg/cm2
Error 1.84e-08 1.81e-08 2.98e-08 8.75e-08 6.87e-08 1.25e-07 erg/cm2
Peak flux Power-law 1.77e-01 1.51e-01 8.82e-02 7.70e-02 4.49e-01 4.93e-01 ph/cm2/s
Error 8.26e-02 4.82e-02 4.12e-02 7.24e-02 1.43e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 9.96e-08 1.39e-07 9.85e-08 3.59e-08 3.63e-07 3.73e-07 erg/cm2
Error 1.99e-08 2.59e-08 4.07e-08 1.18e-07 8.03e-08 1.56e-07 erg/cm2
Peak flux Cutoff-PL 1.55e-01 1.94e-01 6.23e-02 2.93e-03 4.15e-01 4.15e-01 ph/cm2/s
Error 1.27e-01 7.98e-02 5.96e-02 7.85e-02 1.86e-01 1.86e-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 4.27e-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 2.175 0.271 - - 1.03e-03 2.01e-04 52.420 57
CPL 1.314 1.253 29.5 0.0 3.55e-03 0.00e+00 51.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.776 0.576 - - 3.29e-03 1.21e-03 51.010 57
CPL 0.016 1.268 41.6 0.0 4.11e-02 0.00e+00 50.570 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 41.376 -4.080 37.296
T90 36.536 -0.584 35.952
T50 24.432 4.280 28.712
Peak 1.000 21.712 22.712
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.4816 -3.8801 0.0176 16.9 -88.7 0.8462 10.9 TRIG_00505801
------------------------------------------
Foreground time interval of the image:
-4.080 37.296 (delta_t = 41.376 [sec])
Background time interval of the image:
-239.000 -4.080 (delta_t = 234.920 [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 -4.080 sec. to 37.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17529 ( -0.259324 0.282504 )
Norm@50keV : 1.03420E-03 ( -0.000203799 0.000199049 )
------------------------------------------------------------
# Chi-Squared = 52.42 using 59 PHA bins.
# Reduced chi-squared = 0.9197 for 57 degrees of freedom
# Null hypothesis probability = 6.472794e-01
Photon flux (15-150 keV) in 41.38 sec: 0.169021 ( -0.0229435 0.0229435 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01021e-07 ( -6.74142e-08 7.00294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.080 sec. to 37.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31447 ( -1.72527 0.780921 )
Epeak [keV] : 29.4855 ( )
Norm@50keV : 3.54950E-03 ( )
------------------------------------------------------------
# Chi-Squared = 51.03 using 59 PHA bins.
# Reduced chi-squared = 0.9112 for 56 degrees of freedom
# Null hypothesis probability = 6.630680e-01
Photon flux (15-150 keV) in 41.38 sec: 0.164348 ( -0.023637 0.023792 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6305e-07 ( -7.32753e-08 8.73544e-08 ) ergs/cm2
Band function
Time interval is from -4.080 sec. to 37.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.619384 ( 0.599664 0.599664 )
beta : -2.58234 ( 2.57716 0.536828 )
Epeak [keV] : 28.2296 ( -28.1145 13.7775 )
Norm@50keV : 1.13357E-02 ( -0.0128146 275.222 )
------------------------------------------------------------
# Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.507628e-01
Photon flux (15-150 keV) in 41.38 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] : 8.26601 (-1.17698 1.39036)
R^2/D10^2 : 0.164259 (-0.0759512 0.139116)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.23 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.663931e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.595e-08 2.158e-08
25- 50 1.591e-07 3.248e-08
50-150 4.647e-08 1.964e-08
15-150 2.915e-07 6.157e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.2312 (-14.2229 25.2311)
Norm : 1.00382 (-0.222725 0.310455)
------------------------------------------------------------
# Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.8949 for 57 degrees of freedom
# Null hypothesis probability = 6.980464e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.962e-08 1.738e-08
25- 50 1.390e-07 2.443e-08
50-150 1.251e-07 4.895e-08
15-150 3.637e-07 7.171e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18400 (-3.2524 2.13322)
R1^2/D10^2 : 0.406122 (-0.2534 5.28414)
kT2 [keV] : 19.2895 (-13.5952 -19.4544)
R2^2/D10^2 : 3.08068E-03 (-0.0029696 0.0714779)
------------------------------------------------------------
# Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.9235 for 55 degrees of freedom
# Null hypothesis probability = 6.360454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.834e-08 5.504e-08
25- 50 1.399e-07 7.409e-08
50-150 1.334e-07 8.288e-08
15-150 3.716e-07 1.880e-07
Peak spectrum fit
Power-law model
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77588 ( -0.556621 0.595998 )
Norm@50keV : 3.29120E-03 ( -0.00123596 0.00117844 )
------------------------------------------------------------
# Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.8950 for 57 degrees of freedom
# Null hypothesis probability = 6.979586e-01
Photon flux (15-150 keV) in 1 sec: 0.449350 ( -0.143344 0.143437 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03286e-08 ( -1.10924e-08 1.16805e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60974E-02 ( 0.0387997 2.57468 )
Epeak [keV] : 41.5828 ( )
Norm@50keV : 4.10681E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.57 using 59 PHA bins.
# Reduced chi-squared = 0.9031 for 56 degrees of freedom
# Null hypothesis probability = 6.797281e-01
Photon flux (15-150 keV) in 1 sec: 0.414588 ( -0.14851 0.224343 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27471e-08 ( -9.0227e-09 1.8015e-08 ) ergs/cm2
Band function
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.75699 ( -1.10064 -1.10064 )
beta : -2.62872 ( 2.53672 1.14934 )
Epeak [keV] : 34.3713 ( -36.4123 34.8459 )
Norm@50keV : 2.95546 ( -2.89708 46.6941 )
------------------------------------------------------------
# Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.9013 for 55 degrees of freedom
# Null hypothesis probability = 6.813547e-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] : 9.79391 (-2.577 3.87227)
R^2/D10^2 : 0.242075 (-0.242074 0.531514)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.8876 for 57 degrees of freedom
# Null hypothesis probability = 7.126155e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.694e-09 2.864e-09
25- 50 1.133e-08 6.855e-09
50-150 5.565e-09 3.809e-09
15-150 2.159e-08 1.405e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.3475 (-54.677 -87.3491)
Norm : 2.07719 (-0.790022 1.40261)
------------------------------------------------------------
# Chi-Squared = 50.85 using 59 PHA bins.
# Reduced chi-squared = 0.8921 for 57 degrees of freedom
# Null hypothesis probability = 7.037376e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.414e-09 3.341e-09
25- 50 9.097e-09 5.730e-09
50-150 1.360e-08 1.177e-08
15-150 2.811e-08 1.864e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.361 ( )
R1^2/D10^2 : 5.18800E-05 (-2.60791e-05 0.010358)
kT2 [keV] : 8.60878 (-1.77598 3.23757)
R2^2/D10^2 : 0.359678 (-0.259485 0.838682)
------------------------------------------------------------
# Chi-Squared = 50.55 using 59 PHA bins.
# Chi-Squared = 47.47 using 59 PHA bins.
# Reduced chi-squared = 0.9192 for 55 degrees of freedom
# Reduced chi-squared = 0.8632 for 55 degrees of freedom
# Null hypothesis probability = 6.450085e-01
# Null hypothesis probability = 7.545148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.719e-09 3.930e-06
25- 50 1.092e-08 3.243e-05
50-150 5.992e-09 8.025e-04
15-150 2.163e-08 8.060e-04
Plot creation:
Wed Oct 19 10:31:38 EDT 2011