batgrbproduct Analysis for Trigger=173321
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): Wed Jan 9 20:11:31 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger173321/GCN5_download_cron
======================================================================
Trigger: 00173321 Segment: 000
BAT Trigger Time: 156625608 [s; MET]
Trigger Stop: 156625672 [s; MET]
UTC: 2005-12-18T19:06:48.096320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 246.657378485672 Dec: -51.93739381185 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33590
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33590
Flight Position: [ source = BAT ]
RA: 246.657378485672 Dec: -51.93739381185 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 246.62903314658 Dec: -51.9396614157793 [deg; J2000]
{ 16h 26m 31.0s , -51d 56' 22.8" }
+/- 2.59604462428728 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79288806650324 [arcmin] (formal 1-sigma fit error)
SNR: 7.78473574827235
RA = 16h 26m 31.0s (246.629033 deg.)
Dec = -51d 56' 23" (-51.939661 deg.)
Angular difference between Flight and Ground position is 1.057296 arcmin
Partial Coding Fraction: 0.296875 [ 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 0.560398 0.348418 -0.004888 0.099612
0.079445 0.073687 0.063875 0.056128 [error]
Peak 0.560398 0.348418 -0.004888 0.099612
0.079445 0.073687 0.063875 0.056128 [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 2.21e-07 1.39e-07 5.58e-08 3.04e-08 4.31e-07 4.46e-07 erg/cm2
Error 4.89e-08 4.40e-08 3.74e-08 4.23e-08 1.10e-07 1.26e-07 erg/cm2
Peak flux Power-law 1.16e-01 4.10e-02 8.26e-03 1.97e-03 1.66e-01 1.67e-01 ph/cm2/s
Error 2.62e-02 1.24e-02 5.36e-03 2.59e-03 3.41e-02 3.43e-02 ph/cm2/s
Fluence Cutoff-PL 2.22e-07 1.49e-07 2.51e-08 6.69e-10 3.97e-07 3.97e-07 erg/cm2
Error 5.18e-08 5.40e-08 4.29e-08 3.20e-08 1.03e-07 1.17e-07 erg/cm2
Peak flux Cutoff-PL 1.16e-01 4.10e-02 8.25e-03 1.95e-03 1.66e-01 1.67e-01 ph/cm2/s
Error 2.61e-02 1.24e-02 5.36e-03 2.57e-03 3.40e-02 3.43e-02 ph/cm2/s
Fluence Band 2.19e-07 1.38e-07 5.60e-08 3.12e-08 4.37e-07 4.45e-07 erg/cm2
Error 4.46e-08 3.24e-08 4.08e-08 9.76e-08 1.13e-07 0.00e+00 erg/cm2
Peak flux Band 1.14e-01 4.22e-02 8.75e-03 2.12e-03 1.68e-01 1.74e-01 ph/cm2/s
Error 2.32e-02 1.34e-02 4.38e-03 1.31e-03 3.46e-02 3.47e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.312 0.590 - - 4.78e-04 2.43e-04 53.801 57
CPL 1.379 3.821 9.0 11.0 1.17e-02 5.47e+00 52.459 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.312 0.590 - - 4.78e-04 2.43e-04 53.801 57
CPL 1.379 3.371 9.0 11.0 1.17e-02 5.47e+00 52.459 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
246.6290 -51.9397 0.0247 41.3 -45.4 1.1686 7.8 TRIG_00173321
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.31153 ( -0.525262 0.654711 )
Norm@50keV : 4.781588E-04 ( -2.241413E-04 2.611908E-04) )
------------------------------------------------------------
Chi-Squared = 53.80140 using 59 PHA bins.
Reduced chi-squared = 0.9438841 for 57 degrees of freedom
Null hypothesis probability = 0.596
Photon flux (15-150 keV) in 64.00 sec: 0.166445 ( -0.034033 0.034075 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31256e-07 ( -1.05422e-07 1.13886e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.37910 ( -4.23050 3.41136 )
Epeak [keV] : 9.03184 ( -9.02184 12.8958 )
Norm@50keV : 1.166872E-02 ( -1.166872E-02 10.9364 )
------------------------------------------------------------
Chi-Squared = 52.45891 using 59 PHA bins.
but latest trial -6.20593 gives Chi-Squared = 2.52340
but latest trial 21.9276 gives Chi-Squared = 4.19870
Reduced chi-squared = 0.9367662 for 56 degrees of freedom
Null hypothesis probability = 0.610
Photon flux (15-150 keV) in 64.00 sec: 0.166373 ( -0.034021 0.03406 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97195e-07 ( -9.17018e-08 1.14938e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43488 ( -8.56512 0.920099 )
beta : -9.11101 ( -0.888988 6.12801 )
Epeak [keV] : 10.3756 ( -10.2756 13.0821 )
Norm@50keV : 7.877296E-03 ( -1.592774E-03 992612. )
------------------------------------------------------------
Chi-Squared = 53.06627 using 59 PHA bins.
Reduced chi-squared = 0.9648412 for 55 degrees of freedom
Null hypothesis probability = 0.549
Photon flux (15-150 keV) in 64.00 sec: 0.168261 ( -0.034706 0.034449 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36605e-07 ( -1.03324e-07 9.1975e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.31153 ( -0.525262 0.654711 )
Norm@50keV : 4.781588E-04 ( -2.241413E-04 2.611908E-04) )
------------------------------------------------------------
Chi-Squared = 53.80140 using 59 PHA bins.
Reduced chi-squared = 0.9438841 for 57 degrees of freedom
Null hypothesis probability = 0.596
Photon flux (15-150 keV) in 64.00 sec: 0.166445 ( -0.034033 0.034075 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31256e-07 ( -1.05422e-07 1.13886e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.37910 ( -4.23050 2.51183 )
Epeak [keV] : 9.03184 ( -9.02184 12.8958 )
Norm@50keV : 1.166872E-02 ( -1.166872E-02 10.9364 )
------------------------------------------------------------
Chi-Squared = 52.45891 using 59 PHA bins.
but latest trial -6.20593 gives Chi-Squared = 2.52340
but latest trial 21.9276 gives Chi-Squared = 4.19870
Reduced chi-squared = 0.9367662 for 56 degrees of freedom
Null hypothesis probability = 0.610
Photon flux (15-150 keV) in 64.00 sec: 0.166373 ( -0.034021 0.03406 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97195e-07 ( -9.17018e-08 1.14938e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43488 ( -8.56512 0.920099 )
beta : -9.11101 ( -0.888988 9.08948 )
Epeak [keV] : 10.3756 ( -10.2756 13.0821 )
Norm@50keV : 7.877296E-03 ( -1.592774E-03 992612. )
------------------------------------------------------------
Chi-Squared = 53.06627 using 59 PHA bins.
Reduced chi-squared = 0.9648412 for 55 degrees of freedom
Null hypothesis probability = 0.549
Photon flux (15-150 keV) in 64.00 sec: 0.168261 ( -0.034706 0.034449 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36605e-07 ( -1.03324e-07 9.1975e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 20:18:44 EST 2008