batgrbproduct Analysis for Trigger=213486
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 1 15:23:57 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger213486/SDC
======================================================================
Trigger: 00213486 Segment: 000
BAT Trigger Time: 171137941.248 [s; MET]
Trigger Stop: 171137945.344 [s; MET]
UTC: 2006-06-04T18:19:00.012500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 337.242167553083 Dec: -10.9050195742294 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.78
Image Trigger?: NO
Rate S/N Ratio: 12.4899959967968 [ if not an image trigger ]
Image S/N Ratio: 6.78
Flight Position: [ source = BAT ]
RA: 337.242167553083 Dec: -10.9050195742294 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 337.263258627293 Dec: -10.9855689954724 [deg; J2000]
{ 22h 29m 03.2s , -10d 59' 08.0" }
+/- 3.1760014549802 [arcmin] (estimated 90% radius based on SNR)
+/- 1.85877243371789 [arcmin] (formal 1-sigma fit error)
SNR: 5.83641227016462
RA = 22h 29m 3.2s (337.263259 deg.)
Dec = -10d 59' 8" (-10.985569 deg.)
Angular difference between Flight and Ground position is 4.990112 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 80 +/- 17
Measured from: -54.2479999959469
to: 25.7520000040531 [s; relative to TRIGTIME]
T50: 45 +/- 15.2643375224737
Measured from: -40.2479999959469
to: 4.75200000405312 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -32.2479999959469
to: -31.2479999959469 [s; relative to TRIGTIME]
Total Fluence
Measured from: -56.2479999959469
to: 32.7520000040531 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.296541 0.246584 0.166989 0.044216
0.049820 0.049416 0.043589 0.038588 [error]
Peak 0.012682 0.014323 0.010764 0.004347
0.005397 0.005528 0.004696 0.004059 [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 9.12e-08 1.15e-07 1.06e-07 1.71e-07 3.70e-07 4.85e-07 erg/cm2
Error 2.43e-08 2.38e-08 4.18e-08 1.34e-07 9.45e-08 1.83e-07 erg/cm2
Peak flux Power-law 1.31e-01 1.14e-01 6.79e-02 6.08e-02 3.40e-01 3.74e-01 ph/cm2/s
Error 8.07e-02 4.49e-02 5.42e-02 8.36e-02 1.32e-01 1.49e-01 ph/cm2/s
Fluence Cutoff-PL 9.06e-08 1.17e-07 1.06e-07 1.43e-07 3.67e-07 4.22e-07 erg/cm2
Error 2.57e-08 2.87e-08 4.40e-08 1.27e-07 9.97e-08 2.09e-07 erg/cm2
Peak flux Cutoff-PL 1.31e-01 1.14e-01 6.80e-02 6.04e-02 3.39e-01 3.74e-01 ph/cm2/s
Error 8.07e-02 4.49e-02 5.42e-02 8.31e-02 1.32e-01 1.48e-01 ph/cm2/s
Fluence Band 8.98e-08 1.16e-07 1.05e-07 1.43e-07 3.67e-07 4.52e-07 erg/cm2
Error 2.55e-08 2.86e-08 4.41e-08 1.68e-07 9.97e-08 2.08e-07 erg/cm2
Peak flux Band 1.31e-01 1.14e-01 6.80e-02 6.04e-02 3.39e-01 3.74e-01 ph/cm2/s
Error 8.17e-02 4.48e-02 4.10e-02 8.31e-02 1.33e-01 1.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.120 0.420 - - 4.47e-04 1.28e-04 51.771 57
CPL 1.533 0.000 34.0 0.0 9.44e-04 2.10e-04 52.115 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.749 0.840 - - 2.51e-03 1.18e-03 53.214 57
CPL 1.650 0.000 177.4 0.0 2.83e-03 2.35e-02 53.245 0
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 89.000 -56.248 32.752
T90 80.000 -54.248 25.752
T50 45.000 -40.248 4.752
Peak 1.000 -32.248 -31.248
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
337.2633 -10.9856 0.0329 25.1 148.7 1.0888 5.8 TRIG_00213486
------------------------------------------
Foreground time interval of the image:
-56.248 32.752 (delta_t = 89.000 [sec])
Background time interval of the image:
-87.043 -56.248 (delta_t = 30.795 [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 -56.248 sec. to 32.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12014 ( -0.388860 0.450236 )
Norm@50keV : 4.470232E-04 ( -1.313802E-04 1.241222E-04) )
------------------------------------------------------------
Chi-Squared = 51.77056 using 59 PHA bins.
Reduced chi-squared = 0.9082555 for 57 degrees of freedom
Null hypothesis probability = 0.671
Photon flux (15-150 keV) in 89.00 sec: 7.103538E-02 ( -0.0139438 0.0139439 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7043e-07 ( -9.2034e-08 9.68845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -56.248 sec. to 32.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53329 ( )
Epeak [keV] : 34.0251 ( )
Norm@50keV : 9.439582E-04 ( -2.235996E-04 1.958295E-04) )
------------------------------------------------------------
Chi-Squared = 52.11532 using 59 PHA bins.
Reduced chi-squared = 0.9306307 for 56 degrees of freedom
Null hypothesis probability = 0.623
Photon flux (15-150 keV) in 89.00 sec: 7.084310E-02 ( -0.0139163 0.0140795 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67355e-07 ( -9.96293e-08 9.97361e-08 ) ergs/cm2
Band function
Time interval is from -56.248 sec. to 32.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61667 ( -5.80884 6.91070 )
beta : -9.08144 ( -0.450018 0.389347 )
Epeak [keV] : 32.8321 ( -32.7321 9967.17 )
Norm@50keV : 8.615614E-04 ( -1.785610E-02 1.687282E-02) )
------------------------------------------------------------
Chi-Squared = 51.99043 using 59 PHA bins.
Reduced chi-squared = 0.9452804 for 55 degrees of freedom
Null hypothesis probability = 0.590
Photon flux (15-150 keV) in 89.00 sec: 7.083448E-02 ( -0.0140156 0.0140693 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66832e-07 ( -9.98268e-08 9.95403e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -32.248 sec. to -31.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74875 ( -0.755381 0.924067 )
Norm@50keV : 2.512674E-03 ( -1.254527E-03 1.099183E-03) )
------------------------------------------------------------
Chi-Squared = 53.21420 using 59 PHA bins.
Reduced chi-squared = 0.9335824 for 57 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 1.000 sec: 0.339606 ( -0.132314 0.132616 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31784e-08 ( -1.07092e-08 1.12632e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -32.248 sec. to -31.248 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64971 ( )
Epeak [keV] : 177.401 ( )
Norm@50keV : 2.825880E-03 ( -1.363054E-03 4.568193E-02) )
------------------------------------------------------------
Chi-Squared = 53.24465 using 59 PHA bins.
but latest trial 4.702971E-02 gives Chi-Squared = 1.85320
Reduced chi-squared = 0.9507974 for 56 degrees of freedom
Null hypothesis probability = 0.580
Photon flux (15-150 keV) in 1.000 sec: 0.339491 ( -0.13228 0.132579 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31701e-08 ( -1.07005e-08 1.12792e-08 ) ergs/cm2
Band function
Time interval is from -32.248 sec. to -31.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75038 ( -2.47996 0.763021 )
beta : -9.30459 ( -0.695410 8.22271 )
Epeak [keV] : 9999.30 ( -9999.20 0.700195 )
Norm@50keV : 2.513523E-03 ( -1.086769E-03 1.108165E-03) )
------------------------------------------------------------
Chi-Squared = 53.21457 using 59 PHA bins.
Reduced chi-squared = 0.9675375 for 55 degrees of freedom
Null hypothesis probability = 0.543
Photon flux (15-150 keV) in 1.000 sec: 0.339492 ( -0.132486 0.132579 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31617e-08 ( -1.07396e-08 1.12562e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 15:49:01 EST 2008