batgrbproduct Analysis for Trigger=212206
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 14:31:58 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger212206/GCN5_download_cron
======================================================================
Trigger: 00212206 Segment: 000
BAT Trigger Time: 170486664 [s; MET]
Trigger Stop: 170486728 [s; MET]
UTC: 2006-05-28T05:24:22.779820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.618732813048 Dec: 16.4164387697234 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.49
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.49
Flight Position: [ source = BAT ]
RA: 268.618732813048 Dec: 16.4164387697234 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.573934058251 Dec: 16.4573115849564 [deg; J2000]
{ 17h 54m 17.7s , +16d 27' 26.3" }
+/- 4.29648776049114 [arcmin] (estimated 90% radius based on SNR)
+/- 3.74650749495531 [arcmin] (formal 1-sigma fit error)
SNR: 3.79027228671002
RA = 17h 54m 17.7s (268.573934 deg.)
Dec = 16d 27' 26" (16.457312 deg.)
Angular difference between Flight and Ground position is 3.558172 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.040456 0.035364 0.033470 0.003211
0.041416 0.036724 0.032447 0.029187 [error]
Peak 0.040456 0.035364 0.033470 0.003211
0.041416 0.036724 0.032447 0.029187 [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 1.98e-08 4.36e-10 2.41e-12 1.34e-14 2.02e-08 2.02e-08 erg/cm2
Error 2.37e-08 9.10e-09 3.59e-09 2.02e-09 3.06e-08 3.08e-08 erg/cm2
Peak flux Power-law 2.21e-02 2.91e-04 8.04e-07 2.23e-09 2.24e-02 2.24e-02 ph/cm2/s
Error 2.12e-02 5.28e-03 1.03e-03 2.53e-04 2.39e-02 2.34e-02 ph/cm2/s
Fluence Cutoff-PL 1.97e-08 4.34e-10 2.39e-12 1.32e-14 2.02e-08 2.02e-08 erg/cm2
Error 2.37e-08 9.10e-09 3.58e-09 2.00e-09 3.06e-08 3.08e-08 erg/cm2
Peak flux Cutoff-PL 2.22e-02 2.94e-04 7.81e-07 1.88e-09 2.25e-02 2.30e-02 ph/cm2/s
Error 2.12e-02 5.28e-03 1.02e-03 2.48e-04 2.79e-02 2.50e-02 ph/cm2/s
Fluence Band 2.09e-08 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 2.25e-02 3.17e-04 9.60e-07 2.89e-09 2.28e-02 2.33e-02 ph/cm2/s
Error 2.19e-02 5.28e-03 8.85e-07 7.75e-07 2.38e-02 1.94e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 8.421 0.000 - - 5.15e-07 5.97e-05 63.076 57
CPL 1.545 0.000 1.0 53.2 1.43e+00 1.82e+04 63.112 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 8.421 0.000 - - 5.15e-07 5.97e-05 63.076 57
CPL 1.545 0.000 1.0 53.2 1.43e+00 1.82e+04 63.112 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.5739 +16.4573 0.0505 38.7 -18.1 0.2854 3.8 TRIG_00212206
------------------------------------------
Foreground time interval of the image:
0.000 33.066 (delta_t = 33.066 [sec])
Background time interval of the image:
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 0.000 sec. to 33.066 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.42094 ( )
Norm@50keV : 5.145488E-07 ( -8.305565E-08 1.193337E-04) )
------------------------------------------------------------
Chi-Squared = 63.07565 using 59 PHA bins.
Reduced chi-squared = 1.106590 for 57 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 33.07 sec: 2.243829E-02 ( -0.0144034 0.033348 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02077e-08 ( -2.02077e-08 4.09162e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.066 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54477 ( )
Epeak [keV] : 1.03562 ( -0.927261 105.534 )
Norm@50keV : 1.43352 ( -3.12479 36489.1 )
------------------------------------------------------------
Chi-Squared = 63.11209 using 59 PHA bins.
but latest trial 186.297 gives Chi-Squared = 3.60772
Reduced chi-squared = 1.127002 for 56 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 33.07 sec: 2.248929E-02 ( -0.0224893 0.0332519 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01529e-08 ( -2.01529e-08 4.10243e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.066 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.03232 ( -0.967676 1.86432 )
beta : -9.06836 ( -0.931636 17.9627 )
Epeak [keV] : 265.066 ( -264.966 9734.93 )
Norm@50keV : 3.176682E-05 ( -3.176682E-05 1.622469E-02) )
------------------------------------------------------------
Chi-Squared = 63.03114 using 59 PHA bins.
Reduced chi-squared = 1.146021 for 55 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 33.07 sec: 2.283282E-02 ( -0.0146574 0.0329077 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.066 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.42094 ( )
Norm@50keV : 5.145488E-07 ( -8.305565E-08 1.193337E-04) )
------------------------------------------------------------
Chi-Squared = 63.07565 using 59 PHA bins.
Reduced chi-squared = 1.106590 for 57 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 33.07 sec: 2.243829E-02 ( -0.0144034 0.033348 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02077e-08 ( -2.02077e-08 4.09162e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.066 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54477 ( )
Epeak [keV] : 1.03562 ( -0.927261 105.534 )
Norm@50keV : 1.43352 ( -3.12479 36489.1 )
------------------------------------------------------------
Chi-Squared = 63.11209 using 59 PHA bins.
but latest trial 186.297 gives Chi-Squared = 3.60772
Reduced chi-squared = 1.127002 for 56 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 33.07 sec: 2.248929E-02 ( -0.0224893 0.0332519 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01529e-08 ( -2.01529e-08 4.10243e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.066 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.03232 ( -0.967676 1.86432 )
beta : -9.06836 ( -0.931636 5.82229 )
Epeak [keV] : 265.066 ( -264.966 9734.93 )
Norm@50keV : 3.176682E-05 ( -3.176682E-05 1.622469E-02) )
------------------------------------------------------------
Chi-Squared = 63.03114 using 59 PHA bins.
Reduced chi-squared = 1.146021 for 55 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 33.07 sec: 2.283282E-02 ( -0.0146574 0.0329077 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jan 1 14:39:22 EST 2008