batgrbproduct Analysis for Trigger=506070
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 23 13:05:55 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger506070/GCN5_download_cron
======================================================================
Trigger: 00506070 Segment: 000
BAT Trigger Time: 340992432.448 [s; MET]
Trigger Stop: 340992433.472 [s; MET]
UTC: 2011-10-22T16:07:04.954100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 275.871554015748 Dec: -23.667890214955 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.41
Image Trigger?: NO
Rate S/N Ratio: 18.6279360101972 [ if not an image trigger ]
Image S/N Ratio: 12.41
Flight Position: [ source = BAT ]
RA: 275.871554015748 Dec: -23.667890214955 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 275.870351739821 Dec: -23.6686086585439 [deg; J2000]
{ 18h 23m 28.9s , -23d 40' 07.0" }
+/- 0.917239815017922 [arcmin] (estimated 90% radius based on SNR)
+/- 0.343624836225045 [arcmin] (formal 1-sigma fit error)
SNR: 34.4123427517368
Angular difference between Flight and Ground position is 0.078888 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 24.7999998927116 +/- 4.23108733304294
Measured from: -14.2279998660088
to: 10.5720000267029 [s; relative to TRIGTIME]
T50: 7.68399995565414 +/- 0.974894839120032
Measured from: -4.66399991512299
to: 3.02000004053116 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.46399998664856
to: -0.46399998664856 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.6840000152588
to: 17.5920000076294 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.004072 1.413497 0.813642 0.196855
0.048595 0.047375 0.041777 0.039618 [error]
Peak 0.074833 0.118960 0.071478 0.007673
0.008841 0.008999 0.007814 0.006819 [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 3.55e-07 5.64e-07 6.76e-07 1.58e-06 2.05e-06 3.17e-06 erg/cm2
Error 2.61e-08 2.51e-08 4.24e-08 2.11e-07 9.93e-08 2.45e-07 erg/cm2
Peak flux Power-law 9.12e-01 8.12e-01 4.97e-01 4.61e-01 2.42e+00 2.68e+00 ph/cm2/s
Error 1.31e-01 7.58e-02 6.51e-02 1.18e-01 2.24e-01 2.50e-01 ph/cm2/s
Fluence Cutoff-PL 3.12e-07 6.06e-07 6.82e-07 5.20e-07 1.90e-06 2.12e-06 erg/cm2
Error 3.15e-08 3.19e-08 4.73e-08 2.43e-07 1.17e-07 2.69e-07 erg/cm2
Peak flux Cutoff-PL 8.08e-01 8.93e-01 5.09e-01 1.65e-01 2.33e+00 2.37e+00 ph/cm2/s
Error 1.52e-01 9.97e-02 7.46e-02 1.38e-01 2.33e-01 2.68e-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 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 1.738 0.081 - - 6.29e-03 2.92e-04 72.780 57
CPL 0.930 0.386 62.2 11.4 1.66e-02 8.05e-03 57.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.709 0.160 - - 1.81e-02 1.84e-03 67.560 57
CPL 0.792 0.759 59.5 28.7 5.73e-02 6.87e-02 62.130 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: 20.672000 sec.
T50 in the 50-300 keV band: 8.768000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 35.276 -17.684 17.592
T90 24.800 -14.228 10.572
T50 7.684 -4.664 3.020
Peak 1.000 -1.464 -0.464
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
275.8704 -23.6686 0.0056 26.8 145.9 3.4437 34.4 TRIG_00506070
------------------------------------------
Foreground time interval of the image:
-17.684 11.253 (delta_t = 28.937 [sec])
Background time interval of the image:
-91.147 -17.684 (delta_t = 73.463 [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 -17.684 sec. to 17.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73844 ( -0.0803584 0.0812493 )
Norm@50keV : 6.29250E-03 ( -0.000292857 0.000291482 )
------------------------------------------------------------
# Chi-Squared = 72.78 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 57 degrees of freedom
# Null hypothesis probability = 7.765529e-02
Photon flux (15-150 keV) in 35.28 sec: 0.847262 ( -0.0382305 0.0383034 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04987e-06 ( -9.90285e-08 9.96025e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.684 sec. to 17.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.929712 ( -0.404228 0.368544 )
Epeak [keV] : 62.2352 ( -7.71102 15.1734 )
Norm@50keV : 1.65966E-02 ( -0.00583966 0.0102519 )
------------------------------------------------------------
# Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.282991e-01
Photon flux (15-150 keV) in 35.28 sec: 0.806224 ( -0.041874 0.042007 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89978e-06 ( -1.16696e-07 1.18124e-07 ) ergs/cm2
Band function
Time interval is from -17.684 sec. to 17.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929675 ( -0.314906 0.375519 )
beta : -10.00000 ( 2.79566e+11 2.79566e+11 )
Epeak [keV] : 62.2234 ( -7.71074 15.1698 )
Norm@50keV : 1.65964E-02 ( -0.00584051 0.0102588 )
------------------------------------------------------------
# Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.914356e-01
Photon flux (15-150 keV) in 35.28 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] : 12.6308 ( )
R^2/D10^2 : 0.167117 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 121.82 using 59 PHA bins.
# Reduced chi-squared = 2.1371 for 57 degrees of freedom
# Null hypothesis probability = 1.315871e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.995e-07 1.535e-08
25- 50 6.657e-07 3.546e-08
50-150 6.599e-07 5.698e-08
15-150 1.525e-06 8.291e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 114.796 (-4.42076 40.5106)
Norm : 3.62390 (-0.215771 0.236795)
------------------------------------------------------------
# Chi-Squared = 59.70 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.776843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.335e-07 2.163e-08
25- 50 5.920e-07 2.769e-08
50-150 1.033e-06 1.282e-07
15-150 1.959e-06 1.436e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.79187 (-1.3156 1.27608)
R1^2/D10^2 : 0.641864 (-0.228751 0.476528)
kT2 [keV] : 23.4138 (-4.41108 7.67425)
R2^2/D10^2 : 1.14933E-02 (-0.00763654 0.0160845)
------------------------------------------------------------
# Chi-Squared = 57.25 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.917481e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.836e-07 4.523e-08
25- 50 6.259e-07 9.596e-08
50-150 9.933e-07 3.967e-07
15-150 1.903e-06 5.049e-07
Peak spectrum fit
Power-law model
Time interval is from -1.464 sec. to -0.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70861 ( -0.157889 0.162141 )
Norm@50keV : 1.81378E-02 ( -0.00185054 0.00182903 )
------------------------------------------------------------
# Chi-Squared = 67.56 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.598464e-01
Photon flux (15-150 keV) in 1 sec: 2.41618 ( -0.224075 0.224228 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67824e-07 ( -1.78265e-08 1.80683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.464 sec. to -0.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.791804 ( -0.82914 0.688825 )
Epeak [keV] : 59.5286 ( -11.8211 45.5738 )
Norm@50keV : 5.73093E-02 ( -0.0327091 0.104697 )
------------------------------------------------------------
# Chi-Squared = 62.13 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.671197e-01
Photon flux (15-150 keV) in 1 sec: 2.32868 ( -0.23287 0.23302 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5462e-07 ( -1.9686e-08 2.0365e-08 ) ergs/cm2
Band function
Time interval is from -1.464 sec. to -0.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.791697 ( -0.596156 1.24089 )
beta : -10.00000 ( 8.18924e+09 8.18924e+09 )
Epeak [keV] : 59.5161 ( -11.8189 45.567 )
Norm@50keV : 5.73155E-02 ( -0.0327435 0.104787 )
------------------------------------------------------------
# Chi-Squared = 62.13 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.372621e-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] : 12.1655 (-1.25251 1.42487)
R^2/D10^2 : 0.568332 (-0.19053 0.279943)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 77.51 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 57 degrees of freedom
# Null hypothesis probability = 3.673189e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.781e-08 3.085e-09
25- 50 5.695e-08 6.370e-09
50-150 5.114e-08 1.139e-08
15-150 1.259e-07 1.505e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.585 (-18.7998 82.6858)
Norm : 10.4181 (-1.16924 1.39633)
------------------------------------------------------------
# Chi-Squared = 63.42 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.605462e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.716e-08 3.485e-09
25- 50 4.835e-08 4.780e-09
50-150 8.506e-08 1.487e-08
15-150 1.606e-07 1.795e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.08476 (-2.41433 2.62154)
R1^2/D10^2 : 2.49057 (-1.4805 7.01749)
kT2 [keV] : 20.9988 (-5.8597 17.9992)
R2^2/D10^2 : 5.29407E-02 (-0.0478867 0.0788673)
------------------------------------------------------------
# Chi-Squared = 61.71 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.487848e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.474e-08 1.279e-08
25- 50 5.117e-08 2.326e-08
50-150 7.943e-08 4.271e-08
15-150 1.553e-07 7.633e-08
Plot creation:
Sun Oct 23 13:30:20 EDT 2011