batgrbproduct Analysis for Trigger=505054
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): Sun Oct 9 14:45:15 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger505054/GCN5_download_cron
======================================================================
Trigger: 00505054 Segment: 000
BAT Trigger Time: 339804785.728 [s; MET]
Trigger Stop: 339804786.752 [s; MET]
UTC: 2011-10-08T22:12:58.280940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 60.4541236181108 Dec: -32.688648181568 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 36.2353418639869 [ if not an image trigger ]
Image S/N Ratio: 9.07
Flight Position: [ source = BAT ]
RA: 60.4541236181108 Dec: -32.688648181568 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 60.4389516112749 Dec: -32.708122469487 [deg; J2000]
{ 04h 01m 45.3s , -32d 42' 29.2" }
+/- 1.22295862679132 [arcmin] (estimated 90% radius based on SNR)
+/- 0.504592135329186 [arcmin] (formal 1-sigma fit error)
SNR: 22.81625857898
Angular difference between Flight and Ground position is 1.397189 arcmin
Partial Coding Fraction: 0.09667969 [ including projection effects ]
Duration
T90: 63.3919999599457 +/- 2.36485690984517
Measured from: -1.63599985837936
to: 61.7560001015663 [s; relative to TRIGTIME]
T50: 29.9839999079704 +/- 1.63381882274816
Measured from: 1.2480001449585
to: 31.2320000529289 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0440000295639038
to: 1.0440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.63599997758865
to: 72.4639999866486 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.530463 3.332553 2.075449 0.637152
0.115196 0.122612 0.110401 0.093310 [error]
Peak 0.149036 0.294503 0.253683 0.111353
0.024465 0.028084 0.027880 0.022010 [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 1.04e-06 1.54e-06 1.70e-06 3.52e-06 5.35e-06 7.79e-06 erg/cm2
Error 8.03e-08 7.16e-08 1.13e-07 4.95e-07 2.63e-07 5.87e-07 erg/cm2
Peak flux Power-law 1.77e+00 2.06e+00 1.72e+00 2.42e+00 6.42e+00 7.97e+00 ph/cm2/s
Error 3.64e-01 2.63e-01 2.16e-01 6.29e-01 7.31e-01 9.04e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-06 1.56e-06 1.71e-06 2.84e-06 5.29e-06 7.12e-06 erg/cm2
Error 9.53e-08 6.49e-08 1.17e-07 1.11e-06 2.95e-07 1.17e-06 erg/cm2
Peak flux Cutoff-PL 1.69e+00 2.11e+00 1.77e+00 1.84e+00 6.38e+00 7.40e+00 ph/cm2/s
Error 4.18e-01 3.68e-01 2.54e-01 7.40e-01 1.30e+00 0.00e+00 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 1.860 0.086 - - 7.74e-03 3.79e-04 46.940 57
CPL 1.725 0.338 98.7 0.0 9.09e-03 0.00e+00 46.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.259 0.184 - - 5.42e-02 5.94e-03 68.250 57
CPL 1.011 0.539 212.3 0.0 7.16e-02 5.69e-02 67.820 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: 39.936000 sec.
T50 in the 50-300 keV band: 9.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 75.100 -2.636 72.464
T90 63.392 -1.636 61.756
T50 29.984 1.248 31.232
Peak 1.000 0.044 1.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
60.4390 -32.7081 0.0085 45.7 139.4 5.0342 22.8 TRIG_00505054
------------------------------------------
Foreground time interval of the image:
-2.636 11.773 (delta_t = 14.409 [sec])
Background time interval of the image:
-239.728 -172.168 (delta_t = 67.560 [sec])
-169.728 -165.678 (delta_t = 4.050 [sec])
-160.728 -125.318 (delta_t = 35.410 [sec])
-123.728 -2.636 (delta_t = 121.092 [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 -2.636 sec. to 72.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85988 ( -0.0851067 0.0863678 )
Norm@50keV : 7.74417E-03 ( -0.000379879 0.000377562 )
------------------------------------------------------------
# Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8235 for 57 degrees of freedom
# Null hypothesis probability = 8.265118e-01
Photon flux (15-150 keV) in 75.1 sec: 1.09292 ( -0.0526001 0.0527389 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34699e-06 ( -2.62549e-07 2.63506e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.636 sec. to 72.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72465 ( -0.342161 0.334402 )
Epeak [keV] : 98.6564 ( )
Norm@50keV : 9.09361E-03 ( )
------------------------------------------------------------
# Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8292 for 56 degrees of freedom
# Null hypothesis probability = 8.151617e-01
Photon flux (15-150 keV) in 75.1 sec: 1.08396 ( -0.05635 0.02833 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29211e-06 ( -2.9699e-07 2.92447e-07 ) ergs/cm2
Band function
Time interval is from -2.636 sec. to 72.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.615079 ( -1.21203 3.81197 )
beta : -1.96284 ( -0.152428 0.127279 )
Epeak [keV] : 35.8069 ( -10.4497 38.7961 )
Norm@50keV : 4.94655E-02 ( -0.0663162 48.5374 )
------------------------------------------------------------
# Chi-Squared = 43.13 using 59 PHA bins.
# Reduced chi-squared = 0.7843 for 55 degrees of freedom
# Null hypothesis probability = 8.769498e-01
Photon flux (15-150 keV) in 75.1 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] : 11.9963 ( )
R^2/D10^2 : 0.248899 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 173.51 using 59 PHA bins.
# Reduced chi-squared = 3.0440 for 57 degrees of freedom
# Null hypothesis probability = 1.072084e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.690e-07 4.758e-08
25- 50 1.790e-06 9.876e-08
50-150 1.549e-06 1.596e-07
15-150 3.907e-06 2.122e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.2120 (-15.5048 20.5976)
Norm : 4.76120 (-0.330144 0.36424)
------------------------------------------------------------
# Chi-Squared = 50.39 using 59 PHA bins.
# Reduced chi-squared = 0.8841 for 57 degrees of freedom
# Null hypothesis probability = 7.194757e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.345e-07 8.486e-08
25- 50 1.610e-06 8.749e-08
50-150 2.582e-06 7.029e-07
15-150 5.127e-06 7.262e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.01332 (-0.785743 0.832134)
R1^2/D10^2 : 1.41106 (-0.459207 0.754662)
kT2 [keV] : 26.9017 (-4.33257 6.70377)
R2^2/D10^2 : 8.93074E-03 (-0.00482172 0.0083661)
------------------------------------------------------------
# Chi-Squared = 43.30 using 59 PHA bins.
# Reduced chi-squared = 0.7874 for 55 degrees of freedom
# Null hypothesis probability = 8.730292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.200e-07 1.154e-07
25- 50 1.630e-06 1.802e-07
50-150 2.713e-06 6.083e-07
15-150 5.262e-06 7.758e-07
Peak spectrum fit
Power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25887 ( -0.184915 0.18252 )
Norm@50keV : 5.42162E-02 ( -0.00594394 0.00594393 )
------------------------------------------------------------
# Chi-Squared = 68.25 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.462615e-01
Photon flux (15-150 keV) in 1 sec: 6.42167 ( -0.730277 0.731886 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41336e-07 ( -6.44034e-08 6.47387e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01102 ( -0.730344 0.346887 )
Epeak [keV] : 212.327 ( -212.378 -212.378 )
Norm@50keV : 7.16007E-02 ( -0.0266825 0.0870208 )
------------------------------------------------------------
# Chi-Squared = 67.82 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 56 degrees of freedom
# Null hypothesis probability = 1.337956e-01
Photon flux (15-150 keV) in 1 sec: 6.37550 ( -0.73909 0.74063 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98394 ( -130.93 -120.93 )
beta : -1.49557 ( -0.266131 0.242716 )
Epeak [keV] : 31.8701 ( -6.67022 6.02897 )
Norm@50keV : 1145.46 ( -1145.46 2046.61 )
------------------------------------------------------------
# Chi-Squared = 61.94 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.424772e-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] : 17.3962 (-2.81588 3.4315)
R^2/D10^2 : 0.459581 (-0.205816 0.373827)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 88.59 using 59 PHA bins.
# Reduced chi-squared = 1.554 for 57 degrees of freedom
# Null hypothesis probability = 4.648225e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.814e-08 6.380e-09
25- 50 1.268e-07 2.091e-08
50-150 2.759e-07 5.830e-08
15-150 4.309e-07 6.990e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.997 ( )
Norm : 26.8153 (-26.8153 -26.8153)
------------------------------------------------------------
# Chi-Squared = 74.66 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.828643e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.675e-08 3.544e-08
25- 50 1.284e-07 6.960e-08
50-150 2.816e-07 1.509e-07
15-150 4.768e-07 2.526e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.29279 (-1.98534 1.8775)
R1^2/D10^2 : 2.78824 (-1.46186 2.49909)
kT2 [keV] : 45.2284 (-16.2998 134.582)
R2^2/D10^2 : 1.65893E-02 (-0.0157088 0.050152)
------------------------------------------------------------
# Chi-Squared = 62.01 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.403722e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.162e-08 2.430e-08
25- 50 1.345e-07 5.810e-08
50-150 3.557e-07 1.794e-07
15-150 5.419e-07 2.484e-07
Plot creation:
Sun Oct 9 15:09:41 EDT 2011