batgrbproduct Analysis for Trigger=163844
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 v2.45
Process Start Time (local time): Wed Sep 30 05:28:30 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger163844/GCN_download_hand
======================================================================
Trigger: 00163844 Segment: 000
BAT Trigger Time: 153634289.2 [s; MET]
Trigger Stop: 153634291.2 [s; MET]
UTC: 2005-11-14T04:11:28.239700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 226.2668 Dec: 60.1564 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 0
Image Trigger?: NO
Rate S/N Ratio: 6.7082 [ if not an image trigger ]
Image S/N Ratio: 0
Flight Position: [ source = BAT ]
RA: 226.2668 Dec: 60.1564 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 226.25569392553 Dec: 60.1607298064905 [deg; J2000]
{ 15h 05m 01.4s , +60d 09' 38.6" }
+/- 2.24893268106027 [arcmin] (estimated 90% radius based on SNR)
+/- 1.08576400825044 [arcmin] (formal 1-sigma fit error)
SNR: 9.55641215521594
Angular difference between Flight and Ground position is 0.421234 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 2 +/- 2.23606797749979
Measured from: 0
to: 2 [s; relative to TRIGTIME]
T50: 2 +/- 1
Measured from: 0
to: 2 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2 second)
Measured from: 0
to: 2 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.033335 0.053000 0.049185 0.007750
0.008275 0.008582 0.008254 0.007333 [error]
Peak 0.033335 0.053000 0.049185 0.007750
0.008275 0.008582 0.008254 0.007333 [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 9.87e-09 2.12e-08 3.59e-08 1.39e-07 9.85e-08 2.06e-07 erg/cm2
Error 3.11e-09 4.08e-09 7.90e-09 6.80e-08 1.99e-08 7.35e-08 erg/cm2
Peak flux Power-law 1.58e-01 1.85e-01 1.57e-01 2.24e-01 5.80e-01 7.24e-01 ph/cm2/s
Error 5.08e-02 3.66e-02 3.34e-02 1.01e-01 1.03e-01 1.37e-01 ph/cm2/s
Fluence Cutoff-PL 8.73e-09 2.25e-08 3.76e-08 5.80e-08 9.38e-08 1.27e-07 erg/cm2
Error 3.77e-09 4.96e-09 8.96e-09 1.01e-07 2.19e-08 9.84e-08 erg/cm2
Peak flux Cutoff-PL 1.39e-01 1.95e-01 1.66e-01 1.14e-01 5.64e-01 6.14e-01 ph/cm2/s
Error 6.20e-02 4.28e-02 3.89e-02 1.28e-01 1.09e-01 1.86e-01 ph/cm2/s
Fluence Band 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.308 - - 4.91e-03 8.69e-04 47.310 57
CPL 0.598 1.270 112.8 0.0 1.01e-02 0.00e+00 46.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.308 - - 4.91e-03 8.69e-04 47.310 57
CPL 0.598 1.270 112.8 0.0 1.01e-02 0.00e+00 46.530 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.000 0.000 2.000
T90 2.000 0.000 2.000
T50 2.000 0.000 2.000
Peak 2.000 0.000 2.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
226.2557 +60.1607 0.0201 26.7 151.5 0.1502 9.6 TRIG_00163844
------------------------------------------
Foreground time interval of the image:
0.000 2.000 (delta_t = 2.000 [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.
- 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 0.000 sec. to 2.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24333 ( -0.309332 0.306671 )
Norm@50keV : 4.91273E-03 ( -0.000870187 0.000867498 )
------------------------------------------------------------
# Chi-Squared = 47.31 using 59 PHA bins.
# Reduced chi-squared = 0.8300 for 57 degrees of freedom
# Null hypothesis probability = 8.163445e-01
Photon flux (15-150 keV) in 2 sec: 0.580415 ( -0.10334 0.103528 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85056e-08 ( -1.9663e-08 2.00602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.597579 ( -1.63756 0.901775 )
Epeak [keV] : 112.797 ( )
Norm@50keV : 1.01441E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8309 for 56 degrees of freedom
# Null hypothesis probability = 8.123758e-01
Photon flux (15-150 keV) in 2 sec: 0.563807 ( -0.109162 0.108273 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3833e-08 ( -2.17674e-08 2.19756e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.597749 ( 0.712891 1.13918 )
beta : -10.00000 ( 7.17496e+10 7.17496e+10 )
Epeak [keV] : 112.800 ( -49.9961 -112.791 )
Norm@50keV : 1.01419E-02 ( -0.010143 0.0495546 )
------------------------------------------------------------
# Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 55 degrees of freedom
# Null hypothesis probability = 7.847939e-01
Photon flux (15-150 keV) in 2 sec: ( ) 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 2.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24333 ( -0.309332 0.306671 )
Norm@50keV : 4.91273E-03 ( -0.000870187 0.000867498 )
------------------------------------------------------------
# Chi-Squared = 47.31 using 59 PHA bins.
# Reduced chi-squared = 0.8300 for 57 degrees of freedom
# Null hypothesis probability = 8.163445e-01
Photon flux (15-150 keV) in 2 sec: 0.580415 ( -0.10334 0.103528 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85056e-08 ( -1.9663e-08 2.00602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.597579 ( -1.63756 0.901775 )
Epeak [keV] : 112.797 ( )
Norm@50keV : 1.01441E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8309 for 56 degrees of freedom
# Null hypothesis probability = 8.123758e-01
Photon flux (15-150 keV) in 2 sec: 0.563807 ( -0.109162 0.108273 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3833e-08 ( -2.17674e-08 2.19756e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.597749 ( 0.712891 1.13918 )
beta : -10.00000 ( 7.17496e+10 7.17496e+10 )
Epeak [keV] : 112.800 ( -49.9961 -112.791 )
Norm@50keV : 1.01419E-02 ( -0.010143 0.0495546 )
------------------------------------------------------------
# Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 55 degrees of freedom
# Null hypothesis probability = 7.847939e-01
Photon flux (15-150 keV) in 2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Sep 30 05:47:10 EDT 2009