batgrbproduct Analysis for Trigger=361128
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Sat Aug 29 12:12:13 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361128/GCN5_download_cron
======================================================================
Trigger: 00361128 Segment: 000
BAT Trigger Time: 273192712 [s; MET]
Trigger Stop: 273193032 [s; MET]
UTC: 2009-08-28T22:51:46.962220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 130.251873646219 Dec: -45.051615934863 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.62
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.62
Flight Position: [ source = BAT ]
RA: 130.251873646219 Dec: -45.051615934863 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 130.29568235297 Dec: -45.0751004459761 [deg; J2000]
{ 08h 41m 11.0s , -45d 04' 30.4" }
+/- 4.18163264151845 [arcmin] (estimated 90% radius based on SNR)
+/- 2.04391512151435 [arcmin] (formal 1-sigma fit error)
SNR: 3.9398656502109
Angular difference between Flight and Ground position is 2.330752 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 0.0239999294281006 +/- 0.0113137314268704
Measured from: 91.4160001277924
to: 91.4400000572205 [s; relative to TRIGTIME]
T50: 0.0159999132156372 +/- 0.01442223432929
Measured from: 91.4200001358986
to: 91.4360000491142 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 90.9319999814034
to: 91.9319999814034 [s; relative to TRIGTIME]
Total Fluence
Measured from: 91.4160000085831
to: 91.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002604 0.002172 0.001240 0.002129
0.000957 0.001003 0.000937 0.000908 [error]
Peak 0.002766 0.002110 0.001076 0.001837
0.001006 0.001046 0.000993 0.000982 [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 7.65e-10 2.36e-10 4.00e-11 7.85e-12 1.05e-09 1.05e-09 erg/cm2
Error 5.85e-10 2.56e-10 9.24e-11 5.00e-11 7.06e-10 7.16e-10 erg/cm2
Peak flux Power-law 8.04e-01 1.54e-01 1.45e-02 1.48e-03 9.74e-01 9.76e-01 ph/cm2/s
Error 6.28e-01 1.58e-01 2.96e-02 7.56e-03 7.75e-01 7.76e-01 ph/cm2/s
Fluence Cutoff-PL 7.65e-10 2.36e-10 4.00e-11 7.79e-12 1.05e-09 1.05e-09 erg/cm2
Error 5.85e-10 2.56e-10 9.23e-11 4.96e-11 7.07e-10 7.16e-10 erg/cm2
Peak flux Cutoff-PL 8.04e-01 1.54e-01 1.45e-02 1.47e-03 9.74e-01 9.74e-01 ph/cm2/s
Error 6.28e-01 1.58e-01 2.96e-02 7.51e-03 7.75e-01 7.76e-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 4.559 2.968 - - 1.10e-03 1.86e-03 48.460 57
CPL 1.000 0.000 50.0 0.0 4.46e-03 0.00e+00 57.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.441 2.885 - - 1.07e-03 1.72e-03 51.770 57
CPL 1.000 0.000 50.0 0.0 4.05e-03 0.00e+00 59.510 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.028 91.416 91.444
T90 0.024 91.416 91.440
T50 0.016 91.420 91.436
Peak 1.000 90.932 91.932
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
130.2957 -45.0751 0.0488 31.1 -0.4 0.0076 3.9 TRIG_00361128
------------------------------------------
Foreground time interval of the image:
91.416 91.444 (delta_t = 0.028 [sec])
Background time interval of the image:
-239.000 91.416 (delta_t = 330.416 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 91.416 sec. to 91.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.55884 ( -1.31729 4.61901 )
Norm@50keV : 1.09882E-03 ( -0.00109882 0.00261249 )
------------------------------------------------------------
# Chi-Squared = 48.46 using 59 PHA bins.
# Reduced chi-squared = 0.8502 for 57 degrees of freedom
# Null hypothesis probability = 7.823347e-01
Photon flux (15-150 keV) in 0.028 sec: 1.12027 ( -1.12026 0.633308 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04576e-09 ( -7.11248e-10 7.01742e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 91.416 sec. to 91.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.46353E-03 ( )
------------------------------------------------------------
# Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 56 degrees of freedom
# Null hypothesis probability = 4.188541e-01
Photon flux (15-150 keV) in 0.028 sec: 1.11961 ( -1.11961 0.6331 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04575e-09 ( -7.11732e-10 7.01896e-10 ) ergs/cm2
Band function
Time interval is from 91.416 sec. to 91.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.38977 ( 4.5074 4.5074 )
beta : -4.56230 ( -4.62472 1.31711 )
Epeak [keV] : 0.833464 ( -0.833464 -0.833464 )
Norm@50keV : 0.148794 ( -0.149376 0.354913 )
------------------------------------------------------------
# Chi-Squared = 48.46 using 59 PHA bins.
# Reduced chi-squared = 0.8811 for 55 degrees of freedom
# Null hypothesis probability = 7.209270e-01
Photon flux (15-150 keV) in 0.028 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] : 4.50640 (-2.86072 1.73317)
R^2/D10^2 : 19.4471 (-19.4461 11674.9)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.05 using 59 PHA bins.
# Reduced chi-squared = 0.8429 for 57 degrees of freedom
# Null hypothesis probability = 7.949050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.573e-10 5.226e-10
25- 50 4.294e-10 3.315e-10
50-150 1.028e-11 1.141e-11
15-150 1.297e-09 8.513e-10
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.17774 (-6.55763 7.77207)
Norm : 53.1335 (-39.1747 3366.28)
------------------------------------------------------------
# Chi-Squared = 47.92 using 59 PHA bins.
# Reduced chi-squared = 0.8406 for 57 degrees of freedom
# Null hypothesis probability = 7.987815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.545e-10 5.599e-10
25- 50 3.266e-10 2.436e-10
50-150 1.759e-11 2.058e-11
15-150 1.199e-09 7.984e-10
Double BB
R1^2/D10^2 : 8.23391 (-16.2848 11643.3)
kT2 [keV] : 1.25395 ( )
R2^2/D10^2 : 8.99909E+04 ( )
------------------------------------------------------------
# Chi-Squared = 48.05 using 59 PHA bins.
# Chi-Squared = 47.21 using 59 PHA bins.
# Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8736 for 55 degrees of freedom
# Reduced chi-squared = 0.8584 for 55 degrees of freedom
# Reduced chi-squared = 0.8565 for 55 degrees of freedom
# Null hypothesis probability = 7.352546e-01
# Null hypothesis probability = 7.631168e-01
# Null hypothesis probability = 7.664551e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 91.416 sec. to 91.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.44129 ( -1.31069 4.45837 )
Norm@50keV : 1.07227E-03 ( -0.00108385 0.00235419 )
------------------------------------------------------------
# Chi-Squared = 51.77 using 59 PHA bins.
# Reduced chi-squared = 0.9082 for 57 degrees of freedom
# Null hypothesis probability = 6.710269e-01
Photon flux (15-150 keV) in 0.032 sec: 0.974345 ( -0.974345 0.576136 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05583e-09 ( -7.32445e-10 7.25462e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 91.416 sec. to 91.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.04651E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.51 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.490825e-01
Photon flux (15-150 keV) in 0.032 sec: 0.973820 ( -0.97382 0.57611 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05588e-09 ( -7.32899e-10 7.2559e-10 ) ergs/cm2
Band function
Time interval is from 91.416 sec. to 91.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.66879 ( 3.28998 6.24742 )
beta : -4.40649 ( -4.46912 1.29337 )
Epeak [keV] : 937.866 ( -937.866 -937.866 )
Norm@50keV : 0.149451 ( -0.148256 0.318914 )
------------------------------------------------------------
# Chi-Squared = 51.77 using 59 PHA bins.
# Reduced chi-squared = 0.9412 for 55 degrees of freedom
# Null hypothesis probability = 5.988927e-01
Photon flux (15-150 keV) in 0.032 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] : 4.53173 (-2.5731 1.76304)
R^2/D10^2 : 16.6631 (-16.6563 2309.19)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.8948 for 57 degrees of freedom
# Null hypothesis probability = 6.982505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.603e-10 5.349e-10
25- 50 4.373e-10 3.147e-10
50-150 1.079e-11 1.295e-11
15-150 1.308e-09 8.752e-10
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.41957 (-6.42736 8.30433)
Norm : 43.8753 (-32.9731 1346.37)
------------------------------------------------------------
# Chi-Squared = 51.09 using 59 PHA bins.
# Reduced chi-squared = 0.8964 for 57 degrees of freedom
# Null hypothesis probability = 6.951127e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.472e-10 5.394e-10
25- 50 3.360e-10 3.018e-10
50-150 1.951e-11 2.885e-11
15-150 1.203e-09 8.515e-10
Double BB
R1^2/D10^2 : 8.84024 ( )
kT2 [keV] : 1.13814 (-1.61293 5.32709)
R2^2/D10^2 : 1.80300E+05 ( )
------------------------------------------------------------
# Chi-Squared = 50.56 using 59 PHA bins.
# Chi-Squared = 50.54 using 59 PHA bins.
# Chi-Squared = 50.45 using 59 PHA bins.
# Reduced chi-squared = 0.9193 for 55 degrees of freedom
# Reduced chi-squared = 0.9188 for 55 degrees of freedom
# Reduced chi-squared = 0.9174 for 55 degrees of freedom
# Null hypothesis probability = 6.447523e-01
# Null hypothesis probability = 6.456751e-01
# Null hypothesis probability = 6.487207e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.239e-10 5.411e-10
25- 50 4.218e-10 3.093e-10
50-150 1.661e-11 1.383e-11
15-150 1.262e-09 1.004e-09
Plot creation:
Sat Aug 29 12:24:40 EDT 2009