batgrbproduct Analysis for Trigger=333320
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 v2.41
Process Start Time (local time): Sat Nov 1 23:29:41 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger333320/GCN5_download_cron
======================================================================
Trigger: 00333320 Segment: 000
BAT Trigger Time: 247232795.2 [s; MET]
Trigger Stop: 247232795.456 [s; MET]
UTC: 2008-11-01T11:46:31.979160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 95.8265748344563 Dec: -0.0822079532699427 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.53
Image Trigger?: NO
Rate S/N Ratio: 28.1780056072107 [ if not an image trigger ]
Image S/N Ratio: 11.53
Flight Position: [ source = BAT ]
RA: 95.8265748344563 Dec: -0.0822079532699427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 95.8362329112208 Dec: -0.111573631268488 [deg; J2000]
{ 06h 23m 20.7s , -00d 06' 41.7" }
+/- 1.68806894665316 [arcmin] (estimated 90% radius based on SNR)
+/- 0.643912212828193 [arcmin] (formal 1-sigma fit error)
SNR: 14.397108069176
Angular difference between Flight and Ground position is 1.854787 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 0.171999990940094 +/- 0.0368781685195268
Measured from: 0.0240001082420349
to: 0.196000099182129 [s; relative to TRIGTIME]
T50: 0.0879999995231628 +/- 0.0200000166893085
Measured from: 0.072000116109848
to: 0.160000115633011 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.383999973535538
to: 0.616000026464462 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.219999998807907 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.023468 0.035562 0.039150 0.010195
0.003833 0.004665 0.004566 0.003280 [error]
Peak 0.023698 0.035281 0.039205 0.008969
0.003844 0.004687 0.004594 0.003330 [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 6.64e-09 1.42e-08 2.39e-08 9.21e-08 6.58e-08 1.25e-07 erg/cm2
Error 1.42e-09 2.01e-09 3.88e-09 3.01e-08 9.89e-09 0.00e+00 erg/cm2
Peak flux Power-law 9.94e-01 1.15e+00 9.55e-01 1.34e+00 3.58e+00 4.43e+00 ph/cm2/s
Error 2.16e-01 1.66e-01 1.54e-01 4.14e-01 4.86e-01 6.40e-01 ph/cm2/s
Fluence Cutoff-PL 5.18e-09 1.68e-08 2.75e-08 1.98e-08 6.23e-08 6.94e-08 erg/cm2
Error 1.71e-09 2.74e-09 4.97e-09 2.06e-08 1.03e-08 2.09e-08 erg/cm2
Peak flux Cutoff-PL 7.48e-01 1.34e+00 1.13e+00 3.92e-01 3.51e+00 3.61e+00 ph/cm2/s
Error 2.61e-01 2.18e-01 2.05e-01 3.21e-01 4.90e-01 5.62e-01 ph/cm2/s
Fluence Band 5.07e-09 1.68e-08 2.72e-08 3.27e-08 6.26e-08 5.87e-08 erg/cm2
Error 1.71e-09 2.82e-09 5.25e-09 3.81e-08 9.62e-09 0.00e+00 erg/cm2
Peak flux Band 7.46e-01 1.34e+00 1.12e+00 5.17e-01 3.51e+00 3.72e+00 ph/cm2/s
Error 2.65e-01 2.16e-01 2.12e-01 2.24e-01 4.88e-01 6.69e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.250 0.200 - - 3.10e-02 4.17e-03 69.935 57
CPL -0.236 1.118 78.3 34.3 1.69e-01 2.99e-01 62.677 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.267 0.202 - - 3.02e-02 4.12e-03 70.347 57
CPL -0.290 1.146 76.4 30.7 1.78e-01 3.27e-01 62.669 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.212 0.008 0.220
T90 0.172 0.024 0.196
T50 0.088 0.072 0.160
Peak 1.000 -0.384 0.616
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.8362 -0.1116 0.0134 26.2 66.1 0.1143 14.4 TRIG_00333320
------------------------------------------
Foreground time interval of the image:
0.008 0.220 (delta_t = 0.212 [sec])
Background time interval of the image:
-239.200 0.008 (delta_t = 239.208 [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 0.008 sec. to 0.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24953 ( -0.198818 0.200863 )
Norm@50keV : 3.100619E-02 ( -4.176220E-03 4.168589E-03) )
------------------------------------------------------------
Chi-Squared = 69.93503 using 59 PHA bins.
Reduced chi-squared = 1.226930 for 57 degrees of freedom
Null hypothesis probability = 0.117
Photon flux (15-150 keV) in 0.2120 sec: 3.66696 ( -0.49223 0.49239 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5791e-08 ( -9.84549e-09 9.93072e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.235707 ( -1.25379 0.983019 )
Epeak [keV] : 78.2845 ( -15.9514 52.6611 )
Norm@50keV : 0.168598 ( -0.112046 0.485813 )
------------------------------------------------------------
Chi-Squared = 62.67673 using 59 PHA bins.
Reduced chi-squared = 1.119227 for 56 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 0.2120 sec: 3.60124 ( -0.49401 0.49651 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23299e-08 ( -1.01866e-08 1.04041e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.287471 ( -1.01491 1.30986 )
beta : -2.59259 ( -7.40741 1.07471 )
Epeak [keV] : 76.3147 ( -27.6479 51.9880 )
Norm@50keV : 0.181298 ( -0.123450 1.74451 )
------------------------------------------------------------
Chi-Squared = 62.55724 using 59 PHA bins.
Reduced chi-squared = 1.137404 for 55 degrees of freedom
Null hypothesis probability = 0.226
Photon flux (15-150 keV) in 0.2120 sec: 3.60453 ( -0.49672 0.49049 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25934e-08 ( -9.04032e-09 1.02055e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2448 -2.2025 2.5661
R^2/D10^2 : 0.303068 -0.114148 0.174459
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 65.10628 using 59 PHA bins.
Reduced chi-squared = 1.142215 for 57 degrees of freedom
Null hypothesis probability = 0.215
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.876e-09 9.542e-10
25- 50 1.734e-08 3.111e-09
50-150 3.699e-08 8.592e-09
15-150 5.821e-08 1.065e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 14.9923 -14.9923 1e+24
------------------------------------------------------------
Chi-Squared = 73.29309 using 59 PHA bins.
Reduced chi-squared = 1.285844 for 57 degrees of freedom
Null hypothesis probability = 7.187E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.911e-09 3.451e-09
25- 50 1.522e-08 7.749e-09
50-150 3.342e-08 1.702e-08
15-150 5.656e-08 2.875e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70165 -3.6666 194.298
R1^2/D10^2 : 3.15276 -3.11853 19.9438
kT2 [keV] : 19.6936 -3.4915 180.306
R2^2/D10^2 : 0.175412 -0.175402 1e+24
------------------------------------------------------------
Chi-Squared = 62.26266 using 59 PHA bins.
but latest trial 23.0861 gives Chi-Squared = 1.25821
Reduced chi-squared = 1.132048 for 55 degrees of freedom
Null hypothesis probability = 0.234
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.470e-09 1.987e-09
25- 50 1.617e-08 3.436e-09
50-150 3.974e-08 1.391e-08
15-150 6.138e-08 1.589e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.008 sec. to 0.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26711 ( -0.200822 0.203397 )
Norm@50keV : 3.018718E-02 ( -4.129780E-03 4.119257E-03) )
------------------------------------------------------------
Chi-Squared = 70.34715 using 59 PHA bins.
Reduced chi-squared = 1.234160 for 57 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 0.2160 sec: 3.58054 ( -0.48579 0.48592 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49631e-08 ( -9.89129e-09 9.98158e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.290361 ( -1.28661 1.00607 )
Epeak [keV] : 76.4350 ( -14.9844 46.4649 )
Norm@50keV : 0.178042 ( -0.119713 0.534820 )
------------------------------------------------------------
Chi-Squared = 62.66860 using 59 PHA bins.
Reduced chi-squared = 1.119082 for 56 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 0.2160 sec: 3.51171 ( -0.49065 0.49007 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1501e-08 ( -1.00637e-08 1.04069e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.285765 ( -1.00132 0.819736 )
beta : -9.26331 ( -7.13577 1.27554 )
Epeak [keV] : 76.4991 ( -23.2747 46.5959 )
Norm@50keV : 0.177154 ( -0.126223 1.05621 )
------------------------------------------------------------
Chi-Squared = 62.66877 using 59 PHA bins.
Reduced chi-squared = 1.139432 for 55 degrees of freedom
Null hypothesis probability = 0.223
Photon flux (15-150 keV) in 0.2160 sec: 3.51311 ( -0.49029 0.48547 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15179e-08 ( -8.38577e-09 1.03788e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1355 -2.1808 2.5319
R^2/D10^2 : 0.302602 -0.113706 0.173467
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 64.73465 using 59 PHA bins.
Reduced chi-squared = 1.135696 for 57 degrees of freedom
Null hypothesis probability = 0.225
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.900e-09 9.453e-10
25- 50 1.737e-08 3.410e-09
50-150 3.650e-08 8.335e-09
15-150 5.776e-08 1.032e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 14.6571 -14.6571 1e+24
------------------------------------------------------------
Chi-Squared = 72.86657 using 59 PHA bins.
Reduced chi-squared = 1.278361 for 57 degrees of freedom
Null hypothesis probability = 7.663E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.876e-09 3.687e-09
25- 50 1.516e-08 7.524e-09
50-150 3.328e-08 1.709e-08
15-150 5.631e-08 2.835e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.28143 -3.47688 194.719
R1^2/D10^2 : 3.98794 -3.96551 213.827
kT2 [keV] : 19.2848 -3.1894 180.715
R2^2/D10^2 : 0.185902 -0.185893 1e+24
------------------------------------------------------------
Chi-Squared = 61.94755 using 59 PHA bins.
Reduced chi-squared = 1.126319 for 55 degrees of freedom
Null hypothesis probability = 0.242
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.514e-09 1.998e-09
25- 50 1.612e-08 3.833e-09
50-150 3.899e-08 1.379e-08
15-150 6.063e-08 1.809e-08
Plot creation:
Sat Nov 1 23:42:25 EDT 2008