batgrbproduct Analysis for Trigger=511866
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): Thu Jan 19 10:13:40 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger511866/batgroup_hand_proc
======================================================================
Trigger: 00511866 Segment: 000
BAT Trigger Time: 348429995.84 [s; MET]
Trigger Stop: 348429996.864 [s; MET]
UTC: 2012-01-16T18:06:28.050200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.2483801033247 Dec: 33.9290006973161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.37
Image Trigger?: NO
Rate S/N Ratio: 55.1996376799703 [ if not an image trigger ]
Image S/N Ratio: 20.37
Flight Position: [ source = BAT ]
RA: 16.2483801033247 Dec: 33.9290006973161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.2452198009155 Dec: 33.925437687902 [deg; J2000]
{ 01h 04m 58.9s , +33d 55' 31.6" }
+/- 0.726491600860825 [arcmin] (estimated 90% radius based on SNR)
+/- 0.282372836159712 [arcmin] (formal 1-sigma fit error)
SNR: 48.0131703003447
Angular difference between Flight and Ground position is 0.265436 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 38.0959998965263 +/- 4.13373632343684
Measured from: -17.9439998269081
to: 20.1520000696182 [s; relative to TRIGTIME]
T50: 11.3879999518394 +/- 0.529694205024167
Measured from: 0.38400012254715
to: 11.7720000743866 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -33.4399999976158
to: 26.5680000185966 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.129098 2.749788 0.717994 0.098124
0.052935 0.053153 0.043300 0.037188 [error]
Peak 0.188610 0.182368 0.064590 0.008007
0.008621 0.009048 0.006615 0.004943 [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 1.22e-06 1.09e-06 6.73e-07 6.31e-07 3.25e-06 3.61e-06 erg/cm2
Error 6.10e-08 3.43e-08 4.04e-08 7.55e-08 1.03e-07 1.29e-07 erg/cm2
Peak flux Power-law 2.13e+00 1.30e+00 5.09e-01 2.67e-01 4.08e+00 4.21e+00 ph/cm2/s
Error 1.82e-01 7.95e-02 5.41e-02 5.25e-02 2.53e-01 2.57e-01 ph/cm2/s
Fluence Cutoff-PL 1.04e-06 1.20e-06 5.67e-07 9.45e-08 2.89e-06 2.90e-06 erg/cm2
Error 7.47e-08 4.43e-08 5.55e-08 4.64e-08 1.27e-07 1.37e-07 erg/cm2
Peak flux Cutoff-PL 1.89e+00 1.49e+00 4.75e-01 3.90e+00 3.91e+00 0.00e+00 ph/cm2/s
Error 2.10e-01 1.13e-01 6.87e-02 2.63e-01 2.67e-01 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 2.697 0.070 - - 5.09e-03 2.17e-04 101.160 57
CPL 1.312 0.411 19.3 6.3 3.27e-02 1.96e-02 55.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.355 0.116 - - 2.27e-02 1.83e-03 50.740 57
CPL 1.045 0.633 29.0 7.3 1.35e-01 0.00e+00 34.070 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: 18.560000 sec.
T50 in the 50-300 keV band: 11.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.008 -33.440 26.568
T90 38.096 -17.944 20.152
T50 11.388 0.384 11.772
Peak 1.000 0.000 1.000
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
16.2452 33.9254 0.0040 28.6021 -158.4357 4.6832486 48.013 TRIG_00511866
Foreground time interval of the image:
-33.440 9.761 (delta_t = 43.201 [sec])
Background time interval of the image:
-239.840 -33.440 (delta_t = 206.400 [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 -33.440 sec. to 26.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69659 ( -0.069824 0.0709794 )
Norm@50keV : 5.09188E-03 ( -0.000217183 0.000216195 )
------------------------------------------------------------
# Chi-Squared = 101.16 using 59 PHA bins.
# Reduced chi-squared = 1.7747 for 57 degrees of freedom
# Null hypothesis probability = 2.860480e-04
Photon flux (15-150 keV) in 60.01 sec: 1.13387 ( -0.0408311 0.0410919 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24678e-06 ( -1.02854e-07 1.02921e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.440 sec. to 26.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31166 ( -0.430457 0.392104 )
Epeak [keV] : 19.3483 ( -7.82143 4.79546 )
Norm@50keV : 3.26801E-02 ( -0.0133625 0.0258835 )
------------------------------------------------------------
# Chi-Squared = 55.27 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 56 degrees of freedom
# Null hypothesis probability = 5.023994e-01
Photon flux (15-150 keV) in 60.01 sec: 1.03034 ( -0.047415 0.04784 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88585e-06 ( -1.25865e-07 1.28901e-07 ) ergs/cm2
Band function
Time interval is from -33.440 sec. to 26.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.404099 ( -1.09727 1.19534 )
beta : -3.27205 ( 3.26381 0.228819 )
Epeak [keV] : 24.2304 ( -7.28922 2.2018 )
Norm@50keV : 0.133708 ( -0.133098 0.882577 )
------------------------------------------------------------
# Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9564 for 55 degrees of freedom
# Null hypothesis probability = 5.666934e-01
Photon flux (15-150 keV) in 60.01 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] : 8.00260 ( )
R^2/D10^2 : 1.07257 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 138.39 using 59 PHA bins.
# Reduced chi-squared = 2.4279 for 57 degrees of freedom
# Null hypothesis probability = 1.013806e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.456e-07 3.931e-08
25- 50 1.306e-06 4.111e-08
50-150 3.432e-07 3.586e-08
15-150 2.394e-06 7.561e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.0279 (-1.99157 2.18527)
Norm : 8.55268 (-0.659378 0.722354)
------------------------------------------------------------
# Chi-Squared = 55.13 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 57 degrees of freedom
# Null hypothesis probability = 5.455138e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.045e-06 5.311e-08
25- 50 1.195e-06 3.991e-08
50-150 6.551e-07 6.307e-08
15-150 2.895e-06 8.791e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.58729 (-0.653907 0.612367)
R1^2/D10^2 : 3.74845 (-1.17421 2.18339)
kT2 [keV] : 13.9210 (-1.99273 2.83841)
R2^2/D10^2 : 5.36849E-02 (-0.0326229 0.0677371)
------------------------------------------------------------
# Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9564 for 55 degrees of freedom
# Null hypothesis probability = 5.668584e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.681e-07 1.185e-07
25- 50 1.199e-06 1.593e-07
50-150 6.691e-07 2.604e-07
15-150 2.836e-06 4.162e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.35469 ( -0.113636 0.118369 )
Norm@50keV : 2.26578E-02 ( -0.00184277 0.00182086 )
------------------------------------------------------------
# Chi-Squared = 50.74 using 59 PHA bins.
# Reduced chi-squared = 0.8902 for 57 degrees of freedom
# Null hypothesis probability = 7.074260e-01
Photon flux (15-150 keV) in 1 sec: 4.08377 ( -0.253035 0.253293 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18852e-07 ( -1.46956e-08 1.48034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04525 ( -0.67681 0.589401 )
Epeak [keV] : 28.9506 ( -9.4945 5.11844 )
Norm@50keV : 0.134656 ( )
------------------------------------------------------------
# Chi-Squared = 34.07 using 59 PHA bins.
# Reduced chi-squared = 0.6083 for 56 degrees of freedom
# Null hypothesis probability = 9.909502e-01
Photon flux (15-150 keV) in 1 sec: 3.90268 ( -0.26245 0.26341 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.941637 ( -0.609768 2.30216 )
beta : -3.54968 ( 3.54899 0.921399 )
Epeak [keV] : 29.2010 ( -9.1405 4.55402 )
Norm@50keV : 0.157660 ( -0.0504543 6.95424 )
------------------------------------------------------------
# Chi-Squared = 33.86 using 59 PHA bins.
# Reduced chi-squared = 0.6156 for 55 degrees of freedom
# Null hypothesis probability = 9.889268e-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] : 8.72726 (-0.55395 0.584652)
R^2/D10^2 : 3.14341 (-0.73605 0.968297)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 63.31 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.635865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.584e-08 4.390e-09
25- 50 9.279e-08 6.245e-09
50-150 3.219e-08 5.610e-09
15-150 1.708e-07 1.190e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.9212 (-5.36309 6.46917)
Norm : 26.0042 (-2.92233 3.32597)
------------------------------------------------------------
# Chi-Squared = 34.62 using 59 PHA bins.
# Reduced chi-squared = 0.6075 for 57 degrees of freedom
# Null hypothesis probability = 9.916317e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.016e-08 4.770e-09
25- 50 7.993e-08 4.560e-09
50-150 6.338e-08 1.098e-08
15-150 2.035e-07 1.575e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.59616 (-1.32386 1.27456)
R1^2/D10^2 : 12.4544 (-6.01945 19.7443)
kT2 [keV] : 14.3079 (-2.89369 5.50736)
R2^2/D10^2 : 0.253101 (-0.201048 0.544415)
------------------------------------------------------------
# Chi-Squared = 34.05 using 59 PHA bins.
# Reduced chi-squared = 0.6190 for 55 degrees of freedom
# Null hypothesis probability = 9.881903e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.748e-08 1.601e-08
25- 50 8.123e-08 2.266e-08
50-150 5.925e-08 2.888e-08
15-150 1.980e-07 6.256e-08
Plot creation:
Thu Jan 19 10:35:06 EST 2012