batgrbproduct Analysis for Trigger=511611
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 Jan 13 00:39:04 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger511611/GCN5_download_cron
======================================================================
Trigger: 00511611 Segment: 000
BAT Trigger Time: 348066586.432 [s; MET]
Trigger Stop: 348066586.496 [s; MET]
UTC: 2012-01-12T13:09:38.656740 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 26.6212981897003 Dec: 61.7632397690641 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.52
Image Trigger?: NO
Rate S/N Ratio: 11.6189500386223 [ if not an image trigger ]
Image S/N Ratio: 6.52
Flight Position: [ source = BAT ]
RA: 26.6212981897003 Dec: 61.7632397690641 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 26.6877418483462 Dec: 61.7981693477776 [deg; J2000]
{ 01h 46m 45.1s , +61d 47' 53.4" }
+/- 2.97358644097033 [arcmin] (estimated 90% radius based on SNR)
+/- 2.07214270249446 [arcmin] (formal 1-sigma fit error)
SNR: 6.41214423975584
Angular difference between Flight and Ground position is 2.818818 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 0.0239999294281006 +/- 0.00894429003608426
Measured from: 0.00800013542175293
to: 0.0320000648498535 [s; relative to TRIGTIME]
T50: 0.0159999132156372 +/- 0.00565686571343518
Measured from: 0.0120001435279846
to: 0.0280000567436218 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.476000010967255
to: 0.523999989032745 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.0360000133514404 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006318 0.006693 0.003965 0.001665
0.001492 0.001314 0.001354 0.000831 [error]
Peak 0.009173 0.022522 0.010533 -0.006405
0.006129 0.006211 0.005467 0.004757 [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 1.95e-09 2.19e-09 1.76e-09 2.35e-09 6.77e-09 8.26e-09 erg/cm2
Error 6.32e-10 6.09e-10 8.77e-10 2.74e-09 2.13e-09 3.54e-09 erg/cm2
Peak flux Power-law 1.62e-01 1.31e-01 7.14e-02 5.72e-02 3.89e-01 4.21e-01 ph/cm2/s
Error 8.02e-02 4.98e-02 4.04e-02 6.82e-02 1.48e-01 1.63e-01 ph/cm2/s
Fluence Cutoff-PL 2.02e-09 2.78e-09 8.74e-11 1.36e-15 4.88e-09 4.88e-09 erg/cm2
Error 7.66e-10 9.38e-10 4.08e-10 1.01e-11 1.34e-09 1.34e-09 erg/cm2
Peak flux Cutoff-PL 1.12e-01 1.80e-01 7.52e-02 4.57e-03 3.71e-01 3.71e-01 ph/cm2/s
Error 9.21e-02 7.24e-02 5.48e-02 2.80e-02 1.44e-01 1.46e-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 1.17e-01 1.77e-01 7.67e-02 5.64e-03 3.78e-01 3.76e-01 ph/cm2/s
Error 9.01e-02 7.23e-02 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 2.315 0.500 - - 2.52e-02 9.38e-03 42.380 57
CPL -6.182 0.000 27.1 4.0 2.90e+04 0.00e+00 35.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.867 0.635 - - 2.75e-03 1.25e-03 59.300 57
CPL -1.036 4.658 45.7 31.9 1.13e-01 2.70e+02 56.120 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 0.028 0.008 0.036
T90 0.024 0.008 0.032
T50 0.016 0.012 0.028
Peak 1.000 -0.476 0.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
26.6877 +61.7982 0.0300 26.7 -149.9 0.0173 6.4 TRIG_00511611
------------------------------------------
Foreground time interval of the image:
0.008 0.036 (delta_t = 0.028 [sec])
Background time interval of the image:
-239.432 0.008 (delta_t = 239.440 [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 0.008 sec. to 0.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31540 ( -0.479339 0.521428 )
Norm@50keV : 2.52255E-02 ( -0.00930745 0.00944304 )
------------------------------------------------------------
# Chi-Squared = 42.38 using 59 PHA bins.
# Reduced chi-squared = 0.7436 for 57 degrees of freedom
# Null hypothesis probability = 9.255401e-01
Photon flux (15-150 keV) in 0.028 sec: 4.44646 ( -1.15878 1.15881 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.76869e-09 ( -2.04677e-09 2.20738e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.18206 ( )
Epeak [keV] : 27.0528 ( -3.72766 4.35207 )
Norm@50keV : 2.90019E+04 ( )
------------------------------------------------------------
# Chi-Squared = 35.23 using 59 PHA bins.
# Reduced chi-squared = 0.6291 for 56 degrees of freedom
# Null hypothesis probability = 9.865096e-01
Photon flux (15-150 keV) in 0.028 sec: 4.20793 ( -1.10984 1.12047 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87981e-09 ( -1.277e-09 1.40608e-09 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98835 ( -175.958 -165.958 )
beta : -4.40110 ( 4.41076 1.68933 )
Epeak [keV] : 26.7144 ( -4.74735 4.25677 )
Norm@50keV : 4395.18 ( -4387.09 3839.7 )
------------------------------------------------------------
# Chi-Squared = 34.65 using 59 PHA bins.
# Reduced chi-squared = 0.6300 for 55 degrees of freedom
# Null hypothesis probability = 9.855253e-01
Photon flux (15-150 keV) in 0.028 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] : 6.85351 (-1.24787 1.6181)
R^2/D10^2 : 10.1641 (-6.15208 13.9573)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 36.82 using 59 PHA bins.
# Reduced chi-squared = 0.6459 for 57 degrees of freedom
# Null hypothesis probability = 9.826003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.100e-09 1.114e-09
25- 50 2.759e-09 1.443e-09
50-150 4.233e-10 3.442e-10
15-150 5.282e-09 2.828e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.1869 (-12.4145 30.9155)
Norm : 35.5423 (-14.9501 24.7664)
------------------------------------------------------------
# Chi-Squared = 40.36 using 59 PHA bins.
# Reduced chi-squared = 0.7080 for 57 degrees of freedom
# Null hypothesis probability = 9.534142e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.065e-09 8.572e-10
25- 50 2.410e-09 1.073e-09
50-150 1.388e-09 1.035e-09
15-150 5.863e-09 2.588e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48283 (-1.25605 1.63135)
R1^2/D10^2 : 12.3053 (-6.15208 13.9571)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 4.00821E-04 (-0.000400589 0.000489795)
------------------------------------------------------------
# Chi-Squared = 36.86 using 59 PHA bins.
# Chi-Squared = 35.06 using 59 PHA bins.
# Reduced chi-squared = 0.6702 for 55 degrees of freedom
# Reduced chi-squared = 0.6374 for 55 degrees of freedom
# Null hypothesis probability = 9.714008e-01
# Null hypothesis probability = 9.834496e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.040e-09 1.199e-09
25- 50 2.822e-09 1.516e-09
50-150 4.764e-10 3.736e-10
15-150 5.338e-09 3.137e-09
Peak spectrum fit
Power-law model
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86745 ( -0.575 0.69479 )
Norm@50keV : 2.75082E-03 ( -0.00126945 0.00122817 )
------------------------------------------------------------
# Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.916663e-01
Photon flux (15-150 keV) in 1 sec: 0.389422 ( -0.148181 0.148182 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52486e-08 ( -1.09863e-08 1.18314e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.03574 ( -6.47054 2.84495 )
Epeak [keV] : 45.7164 ( -9.59034 54.147 )
Norm@50keV : 0.113120 ( -0.145089 540.157 )
------------------------------------------------------------
# Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.702257e-01
Photon flux (15-150 keV) in 1 sec: 0.370887 ( -0.141056 0.14674 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24561e-08 ( -9.086e-09 1.11261e-08 ) ergs/cm2
Band function
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.12547 ( -1.85738 -0.024198 )
beta : -10.00000 ( 9.20066e+06 9.20067e+06 )
Epeak [keV] : 45.5940 ( -17.9594 55.2437 )
Norm@50keV : 0.127000 ( -0.148861 11.9964 )
------------------------------------------------------------
# Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.327443e-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] : 11.6547 (-3.45469 4.7201)
R^2/D10^2 : 0.119225 (-0.119225 0.305408)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 0.9844 for 57 degrees of freedom
# Null hypothesis probability = 5.084748e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.415e-09 2.204e-09
25- 50 1.038e-08 6.460e-09
50-150 8.309e-09 6.255e-09
15-150 2.210e-08 1.450e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.8546 (-44.1399 -74.6138)
Norm : 1.93554 (-0.788562 1.30128)
------------------------------------------------------------
# Chi-Squared = 57.93 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.407205e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.003e-09 3.175e-09
25- 50 8.129e-09 5.310e-09
50-150 1.106e-08 9.695e-09
15-150 2.419e-08 1.603e-08
Double BB
R1^2/D10^2 : 2739.12 ( )
kT2 [keV] : 11.9241 (-3.64392 -11.889)
R2^2/D10^2 : 0.107647 ( )
------------------------------------------------------------
# Chi-Squared = 56.07 using 59 PHA bins.
# Chi-Squared = 56.04 using 59 PHA bins.
# Chi-Squared = 55.89 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.343969e-01
# Null hypothesis probability = 4.356768e-01
# Null hypothesis probability = 4.413229e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.635e-09 2.424e-09
25- 50 1.006e-08 9.565e-09
50-150 8.730e-09 1.010e-08
15-150 2.242e-08 1.670e-08
Plot creation:
Fri Jan 13 01:11:44 EST 2012