batgrbproduct Analysis for Trigger=508161
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): Tue Nov 22 06:22:11 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger508161/GCN5_download_cron
======================================================================
Trigger: 00508161 Segment: 000
BAT Trigger Time: 343585592.232 [s; MET]
Trigger Stop: 343585592.296 [s; MET]
UTC: 2011-11-21T16:26:24.635300 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 154.75137632177 Dec: -46.6373700839271 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 143.013985330107 [ if not an image trigger ]
Image S/N Ratio: 10.2
Flight Position: [ source = BAT ]
RA: 154.75137632177 Dec: -46.6373700839271 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.748323948744 Dec: -46.6698989542299 [deg; J2000]
{ 10h 18m 59.6s , -46d 40' 11.6" }
+/- 1.01685925880654 [arcmin] (estimated 90% radius based on SNR)
+/- 0.397575932045076 [arcmin] (formal 1-sigma fit error)
SNR: 29.6992676945798
Angular difference between Flight and Ground position is 1.955776 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 117.755999922752 +/- 21.4402925626757
Measured from: -0.0239998698234558
to: 117.732000052929 [s; relative to TRIGTIME]
T50: 50.851999938488 +/- 4.22512719223048
Measured from: 0.556000113487244
to: 51.4080000519753 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.263999998569489
to: 0.736000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.335999965667725
to: 141.083999991417 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.035254 1.314994 0.956158 0.316143
0.071322 0.072279 0.063831 0.056244 [error]
Peak 0.146608 0.273383 0.355815 0.148912
0.010256 0.012881 0.014336 0.013485 [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 3.53e-07 5.87e-07 7.41e-07 1.86e-06 2.20e-06 3.55e-06 erg/cm2
Error 3.81e-08 3.76e-08 6.38e-08 3.48e-07 1.50e-07 3.95e-07 erg/cm2
Peak flux Power-law 1.51e+00 2.12e+00 2.19e+00 4.17e+00 7.14e+00 9.99e+00 ph/cm2/s
Error 1.46e-01 1.23e-01 1.12e-01 4.67e-01 3.37e-01 5.37e-01 ph/cm2/s
Fluence Cutoff-PL 3.54e-07 5.88e-07 7.41e-07 1.85e-06 2.20e-06 3.40e-06 erg/cm2
Error 4.09e-08 3.76e-08 6.38e-08 3.43e-07 1.53e-07 6.33e-07 erg/cm2
Peak flux Cutoff-PL 1.37e+00 2.15e+00 2.29e+00 2.96e+00 7.04e+00 8.77e+00 ph/cm2/s
Error 1.88e-01 1.32e-01 1.43e-01 9.49e-01 3.49e-01 1.01e+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 1.665 0.115 - - 1.68e-03 1.08e-04 72.600 57
CPL 1.667 0.116 9999.4 0.0 1.68e-03 0.00e+00 72.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.949 0.082 - - 6.21e-02 2.91e-03 39.580 57
CPL 0.599 0.336 233.8 843.3 8.85e-02 2.97e-02 36.180 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: 47.488000 sec.
T50 in the 50-300 keV band: 29.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 141.420 -0.336 141.084
T90 117.756 -0.024 117.732
T50 50.852 0.556 51.408
Peak 1.000 -0.264 0.736
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.7483 -46.6699 0.0065 38.6 -166.4 1.5507 29.7 TRIG_00508161
------------------------------------------
Foreground time interval of the image:
-0.336 8.969 (delta_t = 9.305 [sec])
Background time interval of the image:
-239.232 -0.336 (delta_t = 238.896 [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 -0.336 sec. to 141.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66524 ( -0.114415 0.1157 )
Norm@50keV : 1.67657E-03 ( -0.000107862 0.000107242 )
------------------------------------------------------------
# Chi-Squared = 72.60 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 57 degrees of freedom
# Null hypothesis probability = 7.978274e-02
Photon flux (15-150 keV) in 141.4 sec: 0.220031 ( -0.0140978 0.0141435 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20154e-06 ( -1.49569e-07 1.5043e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.336 sec. to 141.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66651 ( -0.116879 0.114617 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 1.67818E-03 ( )
------------------------------------------------------------
# Chi-Squared = 72.60 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 56 degrees of freedom
# Null hypothesis probability = 6.715977e-02
Photon flux (15-150 keV) in 141.4 sec: 0.219961 ( -0.014091 0.014045 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20016e-06 ( -1.4765e-07 1.58934e-07 ) ergs/cm2
Band function
Time interval is from -0.336 sec. to 141.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20713 ( 1.19808 1.19808 )
beta : -1.67657 ( 1.67736 0.124829 )
Epeak [keV] : 44.3518 ( -44.9999 -44.9999 )
Norm@50keV : 3.63268E-03 ( -0.00216783 0 )
------------------------------------------------------------
# Chi-Squared = 72.52 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 55 degrees of freedom
# Null hypothesis probability = 5.682454e-02
Photon flux (15-150 keV) in 141.4 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] : 13.9165 ( )
R^2/D10^2 : 3.02216E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 153.17 using 59 PHA bins.
# Reduced chi-squared = 2.6871 for 57 degrees of freedom
# Null hypothesis probability = 9.633954e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.749e-07 2.093e-08
25- 50 6.467e-07 5.345e-08
50-150 8.221e-07 1.061e-07
15-150 1.644e-06 1.251e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 156.785 (14.9315 -101.24)
Norm : 0.896220 (-0.0653779 0.0720962)
------------------------------------------------------------
# Chi-Squared = 75.17 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 57 degrees of freedom
# Null hypothesis probability = 5.376070e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.242e-07 3.231e-08
25- 50 6.048e-07 4.171e-08
50-150 1.215e-06 1.573e-07
15-150 2.144e-06 1.782e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40069 (-1.07949 1.22334)
R1^2/D10^2 : 0.359646 (-0.167051 0.366518)
kT2 [keV] : 26.3526 (-4.54721 7.28337)
R2^2/D10^2 : 2.49068E-03 (-0.00140566 0.00246826)
------------------------------------------------------------
# Chi-Squared = 73.05 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 55 degrees of freedom
# Null hypothesis probability = 5.216870e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.433e-07 8.541e-08
25- 50 5.860e-07 1.100e-07
50-150 1.267e-06 3.439e-07
15-150 2.197e-06 4.129e-07
Peak spectrum fit
Power-law model
Time interval is from -0.264 sec. to 0.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.948607 ( -0.0824735 0.0818028 )
Norm@50keV : 6.21382E-02 ( -0.00291313 0.00290817 )
------------------------------------------------------------
# Chi-Squared = 39.58 using 59 PHA bins.
# Reduced chi-squared = 0.6943 for 57 degrees of freedom
# Null hypothesis probability = 9.617973e-01
Photon flux (15-150 keV) in 1 sec: 7.13876 ( -0.337068 0.33732 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84598e-07 ( -3.55754e-08 3.56881e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.264 sec. to 0.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.598605 ( -0.351895 0.319631 )
Epeak [keV] : 233.840 ( -88.2442 1598.42 )
Norm@50keV : 8.85081E-02 ( -0.0232807 0.0362106 )
------------------------------------------------------------
# Chi-Squared = 36.18 using 59 PHA bins.
# Reduced chi-squared = 0.6461 for 56 degrees of freedom
# Null hypothesis probability = 9.816800e-01
Photon flux (15-150 keV) in 1 sec: 7.04306 ( -0.34874 0.34842 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74702e-07 ( -3.7549e-08 3.7355e-08 ) ergs/cm2
Band function
Time interval is from -0.264 sec. to 0.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99998 ( -89326.5 -89326.5 )
beta : -0.981115 ( -0.102729 0.0966929 )
Epeak [keV] : 26.4819 ( -26.4453 5.61147 )
Norm@50keV : 2856.71 ( -2881.56 7.04419e+06 )
------------------------------------------------------------
# Chi-Squared = 38.16 using 59 PHA bins.
# Reduced chi-squared = 0.6938 for 55 degrees of freedom
# Null hypothesis probability = 9.592414e-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] : 22.7974 (-1.41168 1.54915)
R^2/D10^2 : 0.233955 (-0.0426828 0.0509906)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 93.19 using 59 PHA bins.
# Reduced chi-squared = 1.635 for 57 degrees of freedom
# Null hypothesis probability = 1.762012e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.213e-08 2.165e-09
25- 50 1.195e-07 9.000e-09
50-150 4.639e-07 3.585e-08
15-150 6.055e-07 3.790e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 28.2019 ( )
------------------------------------------------------------
# Chi-Squared = 177.27 using 59 PHA bins.
# Reduced chi-squared = 3.1100 for 57 degrees of freedom
# Null hypothesis probability = 2.918970e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.022e-08 3.647e-08
25- 50 1.351e-07 7.005e-08
50-150 2.963e-07 1.531e-07
15-150 5.016e-07 2.598e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91997 (-1.44187 1.92872)
R1^2/D10^2 : 4.38810 (-2.3754 5.71652)
kT2 [keV] : 30.7747 (-3.47404 5.20945)
R2^2/D10^2 : 8.35652E-02 (-0.032954 0.03948)
------------------------------------------------------------
# Chi-Squared = 33.67 using 59 PHA bins.
# Reduced chi-squared = 0.6123 for 55 degrees of freedom
# Null hypothesis probability = 9.896264e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.554e-08 1.253e-08
25- 50 1.206e-07 2.379e-08
50-150 5.100e-07 6.050e-08
15-150 6.762e-07 9.430e-08
Plot creation:
Tue Nov 22 06:43:26 EST 2011