batgrbproduct Analysis for Trigger=152113
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): Tue Jan 8 18:17:40 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152113/SDC
======================================================================
Trigger: 00152113 Segment: 000
BAT Trigger Time: 146729889.984 [s; MET]
Trigger Stop: 146729898.176 [s; MET]
UTC: 2005-08-26T06:18:10.289400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 87.7286242278895 Dec: -2.67982454693241 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 12.4498995979887 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 87.7286242278895 Dec: -2.67982454693241 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 87.7584708983138 Dec: -2.64781236904476 [deg; J2000]
{ 05h 51m 02.0s , -02d 38' 52.1" }
+/- 1.98723771273115 [arcmin] (estimated 90% radius based on SNR)
+/- 1.13698186583937 [arcmin] (formal 1-sigma fit error)
SNR: 11.4037373997926
RA = 5h 51m 2.0s (87.758471 deg.)
Dec = -2d 38' 52" (-2.647812 deg.)
Angular difference between Flight and Ground position is 2.624737 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 35.1519999802113 +/- 5.86506950125527
Measured from: 0.495999991893768
to: 35.647999972105 [s; relative to TRIGTIME]
T50: 15.8559999763966 +/- 10.4284288245749
Measured from: 4.08000001311302
to: 19.9359999895096 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.203999996185303
to: 0.796000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.208000004291534
to: 38.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.125170 0.223202 0.191434 0.088839
0.032844 0.033203 0.028706 0.024651 [error]
Peak 0.015152 0.012357 0.018707 0.007745
0.005467 0.005363 0.004734 0.004058 [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 3.69e-08 8.45e-08 1.53e-07 6.61e-07 4.17e-07 9.29e-07 erg/cm2
Error 1.24e-08 1.64e-08 2.80e-08 2.97e-07 7.14e-08 3.08e-07 erg/cm2
Peak flux Power-law 1.05e-01 1.24e-01 1.05e-01 1.51e-01 3.88e-01 4.85e-01 ph/cm2/s
Error 7.07e-02 4.83e-02 3.97e-02 1.41e-01 1.26e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 3.68e-08 8.47e-08 1.53e-07 6.56e-07 4.17e-07 9.21e-07 erg/cm2
Error 1.24e-08 1.64e-08 2.80e-08 2.94e-07 7.14e-08 3.06e-07 erg/cm2
Peak flux Cutoff-PL 1.05e-01 1.24e-01 1.05e-01 1.50e-01 3.87e-01 4.84e-01 ph/cm2/s
Error 7.07e-02 4.83e-02 3.98e-02 1.41e-01 1.26e-01 1.59e-01 ph/cm2/s
Fluence Band 3.65e-08 8.43e-08 1.53e-07 6.55e-07 4.17e-07 9.27e-07 erg/cm2
Error 1.25e-08 1.63e-08 2.80e-08 3.52e-07 7.14e-08 3.19e-07 erg/cm2
Peak flux Band 1.05e-01 1.24e-01 1.05e-01 1.50e-01 3.87e-01 4.84e-01 ph/cm2/s
Error 7.07e-02 4.83e-02 4.03e-02 1.22e-01 1.26e-01 1.59e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.141 0.306 - - 1.03e-03 1.62e-04 58.574 57
CPL 1.136 0.309 9984.2 5000.0 1.04e-03 1.22e-04 58.586 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.238 0.685 - - 3.28e-03 1.01e-03 36.077 57
CPL 1.234 0.690 9996.0 5000.0 3.30e-03 1.01e-03 36.084 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: 7.808000 sec.
T50 in the 50-300 keV band: 4.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 39.152 -0.208 38.944
T90 35.152 0.496 35.648
T50 15.856 4.080 19.936
Peak 1.000 -0.204 0.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
87.7585 -2.6478 0.0169 17.6 52.2 0.7483 11.4 TRIG_00152113
------------------------------------------
Foreground time interval of the image:
-0.208 38.944 (delta_t = 39.152 [sec])
Background time interval of the image:
-231.883 -0.208 (delta_t = 231.675 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.208 sec. to 38.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14108 ( -0.313028 0.299725 )
Norm@50keV : 1.032353E-03 ( -1.621455E-04 1.613935E-04) )
------------------------------------------------------------
Chi-Squared = 58.57429 using 59 PHA bins.
Reduced chi-squared = 1.027619 for 57 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 39.15 sec: 0.120267 ( -0.019757 0.019881 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17132e-07 ( -7.10146e-08 7.17306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 38.944 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13642 ( -0.315420 0.301705 )
Epeak [keV] : 9984.16 ( -9984.15 15.8369 )
Norm@50keV : 1.037682E-03 ( -8.180790E-05 1.620550E-04) )
------------------------------------------------------------
Chi-Squared = 58.58629 using 59 PHA bins.
but latest trial 8.749821E-04 gives Chi-Squared = 2.75579
Reduced chi-squared = 1.046184 for 56 degrees of freedom
Null hypothesis probability = 0.381
Photon flux (15-150 keV) in 39.15 sec: 0.120224 ( -0.019752 0.019874 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17296e-07 ( -7.11285e-08 7.16876e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 38.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.939932 ( -9.06007 5.93953 )
beta : -1.14108 ( -8.85892 0.313028 )
Epeak [keV] : 55.9433 ( -55.8433 9944.06 )
Norm@50keV : 1.724200E-03 ( -8.514207E-04 33.5052 )
------------------------------------------------------------
Chi-Squared = 58.57428 using 59 PHA bins.
Reduced chi-squared = 1.064987 for 55 degrees of freedom
Null hypothesis probability = 0.346
Photon flux (15-150 keV) in 39.15 sec: 0.120070 ( -0.018655 0.018654 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.16959e-07 ( -7.10843e-08 7.1668e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23783 ( -0.703234 0.666877 )
Norm@50keV : 3.283126E-03 ( -1.009748E-03 1.009682E-03) )
------------------------------------------------------------
Chi-Squared = 36.07698 using 59 PHA bins.
Reduced chi-squared = 0.6329295 for 57 degrees of freedom
Null hypothesis probability = 0.986
Photon flux (15-150 keV) in 1.008 sec: 0.387539 ( -0.125478 0.125879 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32321e-08 ( -1.15701e-08 1.17146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23395 ( -0.709383 0.671177 )
Epeak [keV] : 9996.04 ( -9996.03 3.96289 )
Norm@50keV : 3.297889E-03 ( -1.014415E-03 1.014340E-03) )
------------------------------------------------------------
Chi-Squared = 36.08402 using 59 PHA bins.
Reduced chi-squared = 0.6443575 for 56 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 1.008 sec: 0.387343 ( -0.12544 0.125846 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32438e-08 ( -1.15795e-08 1.1718e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.957664 ( -9.04234 5.95344 )
beta : -1.23921 ( -8.76079 0.704598 )
Epeak [keV] : 63.2938 ( -63.1938 9936.71 )
Norm@50keV : 5.880579E-03 ( -5.880579E-03 37.9352 )
------------------------------------------------------------
Chi-Squared = 36.07544 using 59 PHA bins.
Reduced chi-squared = 0.6559171 for 55 degrees of freedom
Null hypothesis probability = 0.977
Photon flux (15-150 keV) in 1.008 sec: 0.387335 ( -0.125428 0.12585 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31929e-08 ( -1.1551e-08 1.175e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 18:30:06 EST 2008