batgrbproduct Analysis for Trigger=510922
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): Mon Jan 2 18:00:40 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger510922/GCN5_download_cron
======================================================================
Trigger: 00510922 Segment: 000
BAT Trigger Time: 347163362.752 [s; MET]
Trigger Stop: 347163366.848 [s; MET]
UTC: 2012-01-02T02:15:55.012820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.200903597835 Dec: 24.7316362946046 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.2
Image Trigger?: NO
Rate S/N Ratio: 12.2882057274445 [ if not an image trigger ]
Image S/N Ratio: 9.2
Flight Position: [ source = BAT ]
RA: 276.200903597835 Dec: 24.7316362946046 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.22410544708 Dec: 24.7129863638609 [deg; J2000]
{ 18h 24m 53.8s , +24d 42' 46.8" }
+/- 0.628940637259293 [arcmin] (estimated 90% radius based on SNR)
+/- 0.231604742003811 [arcmin] (formal 1-sigma fit error)
SNR: 58.9954979163077
Angular difference between Flight and Ground position is 1.688537 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 38.7319999933243 +/- 3.47558575518052
Measured from: 6.52800011634827
to: 45.2600001096725 [s; relative to TRIGTIME]
T50: 4.87199991941452 +/- 0.4040792083472
Measured from: 30.8200001716614
to: 35.6920000910759 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.7520000338554
to: 33.7520000338554 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.76800000667572
to: 53.9399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.958119 2.657911 1.835817 0.519698
0.052999 0.054782 0.047959 0.037756 [error]
Peak 0.274212 0.442805 0.407422 0.136358
0.011151 0.013261 0.012796 0.009330 [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 6.45e-07 1.12e-06 1.49e-06 4.04e-06 4.34e-06 7.30e-06 erg/cm2
Error 3.48e-08 3.44e-08 5.06e-08 3.16e-07 1.22e-07 3.42e-07 erg/cm2
Peak flux Power-law 2.75e+00 3.27e+00 2.80e+00 4.09e+00 1.03e+01 1.29e+01 ph/cm2/s
Error 1.90e-01 1.34e-01 1.07e-01 3.44e-01 3.62e-01 4.47e-01 ph/cm2/s
Fluence Cutoff-PL 6.45e-07 1.12e-06 1.49e-06 4.01e-06 4.34e-06 7.00e-06 erg/cm2
Error 3.72e-08 3.44e-08 5.07e-08 5.68e-07 1.22e-07 6.34e-07 erg/cm2
Peak flux Cutoff-PL 2.75e+00 3.27e+00 2.80e+00 4.06e+00 1.03e+01 1.29e+01 ph/cm2/s
Error 2.03e-01 1.34e-01 1.12e-01 5.42e-01 3.59e-01 4.43e-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 1.590 0.052 - - 8.73e-03 2.34e-04 55.700 57
CPL 1.589 0.055 9999.4 0.0 8.74e-03 9.22e-04 55.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.222 0.061 - - 8.72e-02 2.91e-03 63.880 57
CPL 1.219 0.125 9930.5 0.0 8.75e-02 1.05e-02 63.910 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: 14.016000 sec.
T50 in the 50-300 keV band: 3.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 53.172 0.768 53.940
T90 38.732 6.528 45.260
T50 4.872 30.820 35.692
Peak 1.000 32.752 33.752
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.2241 +24.7130 0.0033 29.5 -27.3 5.7468 59.0 TRIG_00510922
------------------------------------------
Foreground time interval of the image:
0.768 35.749 (delta_t = 34.981 [sec])
Background time interval of the image:
-171.251 0.768 (delta_t = 172.019 [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 0.768 sec. to 53.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59039 ( -0.0520962 0.0521427 )
Norm@50keV : 8.72598E-03 ( -0.000233972 0.000233904 )
------------------------------------------------------------
# Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 57 degrees of freedom
# Null hypothesis probability = 5.238742e-01
Photon flux (15-150 keV) in 53.17 sec: 1.11801 ( -0.0335954 0.033773 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.34418e-06 ( -1.21921e-07 1.22168e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.768 sec. to 53.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58913 ( -0.0589034 0.0517989 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 8.74486E-03 ( -0.000234293 0.00160944 )
------------------------------------------------------------
# Chi-Squared = 55.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 56 degrees of freedom
# Null hypothesis probability = 4.856055e-01
Photon flux (15-150 keV) in 53.17 sec: 1.11716 ( -0.01781 0.03384 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.34403e-06 ( -1.21472e-07 1.22328e-07 ) ergs/cm2
Band function
Time interval is from 0.768 sec. to 53.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.10175 ( -2.48476 -1.31682 )
beta : -1.62514 ( -0.0651154 0.061633 )
Epeak [keV] : 29.4143 ( -6.82161 88.8497 )
Norm@50keV : 0.812093 ( -0.810903 383.899 )
------------------------------------------------------------
# Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 55 degrees of freedom
# Null hypothesis probability = 5.882412e-01
Photon flux (15-150 keV) in 53.17 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] : 15.7265 ( )
R^2/D10^2 : 9.90570E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 429.43 using 59 PHA bins.
# Reduced chi-squared = 7.5339 for 57 degrees of freedom
# Null hypothesis probability = 1.500701e-58
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.703e-07 1.486e-08
25- 50 1.121e-06 3.881e-08
50-150 1.924e-06 9.916e-08
15-150 3.315e-06 1.090e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.988 ( )
Norm : 4.47841 (-4.47841 -4.47841)
------------------------------------------------------------
# Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.260381e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.931e-07 2.999e-07
25- 50 1.141e-06 5.764e-07
50-150 2.502e-06 1.269e-06
15-150 4.236e-06 2.155e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.54765 (-0.567008 0.598156)
R1^2/D10^2 : 0.983180 (-0.231801 0.321531)
kT2 [keV] : 31.2897 (-3.01094 3.89083)
R2^2/D10^2 : 7.19778E-03 (-0.00230814 0.00300041)
------------------------------------------------------------
# Chi-Squared = 46.01 using 59 PHA bins.
# Reduced chi-squared = 0.8366 for 55 degrees of freedom
# Null hypothesis probability = 8.006727e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.710e-07 4.809e-08
25- 50 1.169e-06 5.955e-08
50-150 2.609e-06 1.938e-07
15-150 4.349e-06 2.550e-07
Peak spectrum fit
Power-law model
Time interval is from 32.752 sec. to 33.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22201 ( -0.0615702 0.0613971 )
Norm@50keV : 8.71684E-02 ( -0.00291442 0.00291369 )
------------------------------------------------------------
# Chi-Squared = 63.88 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.476841e-01
Photon flux (15-150 keV) in 1 sec: 10.2646 ( -0.361487 0.362236 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.78959e-07 ( -3.20161e-08 3.21046e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.752 sec. to 33.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21892 ( -0.188338 0.0609471 )
Epeak [keV] : 9930.45 ( -1087.81 -1087.81 )
Norm@50keV : 8.74515E-02 ( -0.0029219 0.0180222 )
------------------------------------------------------------
# Chi-Squared = 63.91 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.185757e-01
Photon flux (15-150 keV) in 1 sec: 10.2614 ( -0.36216 0.3554 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.79e-07 ( -3.1885e-08 3.2151e-08 ) ergs/cm2
Band function
Time interval is from 32.752 sec. to 33.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.86885 ( -3.48592 -3.48592 )
beta : -1.23802 ( -0.0695742 0.0672803 )
Epeak [keV] : 23.9619 ( -23.9634 160.773 )
Norm@50keV : 1259.95 ( -1257.43 7009.67 )
------------------------------------------------------------
# Chi-Squared = 62.77 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 55 degrees of freedom
# Null hypothesis probability = 2.201751e-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] : 19.6982 ( )
R^2/D10^2 : 0.484813 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 276.36 using 59 PHA bins.
# Reduced chi-squared = 4.8485 for 57 degrees of freedom
# Null hypothesis probability = 1.540230e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.648e-08 2.510e-09
25- 50 1.799e-07 8.650e-09
50-150 5.163e-07 2.925e-08
15-150 7.326e-07 3.205e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 42.9803 ( )
------------------------------------------------------------
# Chi-Squared = 155.37 using 59 PHA bins.
# Reduced chi-squared = 2.7258 for 57 degrees of freedom
# Null hypothesis probability = 4.702822e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-07 5.455e-08
25- 50 2.059e-07 1.053e-07
50-150 4.515e-07 2.313e-07
15-150 7.644e-07 3.902e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.06363 (-1.01337 1.13286)
R1^2/D10^2 : 5.78313 (-1.94697 3.25571)
kT2 [keV] : 35.5009 (-4.45571 6.70406)
R2^2/D10^2 : 6.13401E-02 (-0.0251806 0.0332568)
------------------------------------------------------------
# Chi-Squared = 67.54 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 55 degrees of freedom
# Null hypothesis probability = 1.195275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.924e-08 8.450e-09
25- 50 1.926e-07 1.530e-08
50-150 6.152e-07 6.475e-08
15-150 8.871e-07 7.220e-08
Plot creation:
Mon Jan 2 18:24:30 EST 2012