batgrbproduct Analysis for Trigger=221627
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 21:35:15 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger221627/GCN5_download_cron
======================================================================
Trigger: 00221627 Segment: 000
BAT Trigger Time: 175818272 [s; MET]
Trigger Stop: 175818336 [s; MET]
UTC: 2006-07-28T22:24:30.654180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.6935998159746 Dec: -41.3863114891152 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 16.6935998159746 Dec: -41.3863114891152 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.6515105792564 Dec: -41.3828299194623 [deg; J2000]
{ 01h 06m 36.4s , -41d 22' 58.2" }
+/- 3.16203182733705 [arcmin] (estimated 90% radius based on SNR)
+/- 2.06075001033222 [arcmin] (formal 1-sigma fit error)
SNR: 5.87328260839048
RA = 1h 6m 36.4s (16.651511 deg.)
Dec = -41d 22' 58" (-41.382830 deg.)
Angular difference between Flight and Ground position is 1.906226 arcmin
Partial Coding Fraction: 1.03125 [ 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 0.132017 0.149040 0.127329 -0.002241
0.034684 0.034971 0.030962 0.027812 [error]
Peak 0.132017 0.149040 0.127329 -0.002241
0.034684 0.034971 0.030962 0.027812 [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 2.91e-08 5.52e-08 8.12e-08 2.55e-07 2.30e-07 4.24e-07 erg/cm2
Error 1.23e-08 1.53e-08 2.83e-08 1.91e-07 7.01e-08 2.14e-07 erg/cm2
Peak flux Power-law 1.46e-02 1.52e-02 1.12e-02 1.32e-02 4.60e-02 5.42e-02 ph/cm2/s
Error 6.30e-03 4.28e-03 3.79e-03 9.06e-03 1.24e-02 1.50e-02 ph/cm2/s
Fluence Cutoff-PL 2.58e-08 6.28e-08 8.36e-08 6.22e-08 2.10e-07 2.24e-07 erg/cm2
Error 1.35e-08 1.99e-08 3.64e-08 2.03e-07 5.63e-08 2.24e-07 erg/cm2
Peak flux Cutoff-PL 1.28e-02 1.71e-02 1.18e-02 4.33e-03 4.47e-02 4.60e-02 ph/cm2/s
Error 6.89e-03 5.47e-03 4.70e-03 1.02e-02 1.24e-02 1.60e-02 ph/cm2/s
Fluence Band 2.55e-08 6.26e-08 8.34e-08 6.11e-08 2.10e-07 2.42e-07 erg/cm2
Error 1.34e-08 1.99e-08 3.61e-08 2.03e-07 7.50e-08 0.00e+00 erg/cm2
Peak flux Band 1.28e-02 1.71e-02 1.18e-02 4.26e-03 4.47e-02 4.59e-02 ph/cm2/s
Error 6.89e-03 5.46e-03 5.62e-03 1.02e-02 1.24e-02 1.60e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.444 0.444 - - 3.74e-04 1.04e-04 72.909 57
CPL 0.444 1.765 72.3 4976.8 1.30e-03 1.33e-02 71.528 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.444 0.444 - - 3.74e-04 1.04e-04 72.909 57
CPL 0.444 1.765 72.3 4976.8 1.30e-03 1.33e-02 71.528 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
16.6515 -41.3828 0.0328 7.1 158.2 0.3793 5.9 TRIG_00221627
------------------------------------------
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: 1.44427 ( -0.443613 0.445145 )
Norm@50keV : 3.741051E-04 ( -1.040290E-04 1.029746E-04) )
------------------------------------------------------------
Chi-Squared = 72.90945 using 59 PHA bins.
Reduced chi-squared = 1.279113 for 57 degrees of freedom
Null hypothesis probability = 7.614E-02
Photon flux (15-150 keV) in 64.00 sec: 4.604644E-02 ( -0.0123943 0.0124225 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29502e-07 ( -6.8768e-08 7.13536e-08 ) 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: 0.443841 ( -2.22552 1.30356 )
Epeak [keV] : 72.3372 ( -25.9494 9927.66 )
Norm@50keV : 1.295823E-03 ( -1.295823E-03 2.535451E-02) )
------------------------------------------------------------
Chi-Squared = 71.52765 using 59 PHA bins.
but latest trial 30.3011 gives Chi-Squared = 7.29523
Reduced chi-squared = 1.277279 for 56 degrees of freedom
Null hypothesis probability = 7.901E-02
Photon flux (15-150 keV) in 64.00 sec: 4.471765E-02 ( -0.0123616 0.0125008 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10042e-07 ( -7.30624e-08 3.95814e-08 ) 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 : -0.524593 ( -9.47541 2.05769 )
beta : -8.36447 ( -8.14297 0.679289 )
Epeak [keV] : 74.8105 ( -42.5710 9957.33 )
Norm@50keV : 1.173273E-03 ( -4.63844 2.02462 )
------------------------------------------------------------
Chi-Squared = 71.53919 using 59 PHA bins.
Reduced chi-squared = 1.300713 for 55 degrees of freedom
Null hypothesis probability = 6.629E-02
Photon flux (15-150 keV) in 64.00 sec: 4.467520E-02 ( -0.012327 0.0125452 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0953e-07 ( -7.25357e-08 7.75258e-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: 1.44427 ( -0.443613 0.445145 )
Norm@50keV : 3.741051E-04 ( -1.040290E-04 1.029746E-04) )
------------------------------------------------------------
Chi-Squared = 72.90945 using 59 PHA bins.
Reduced chi-squared = 1.279113 for 57 degrees of freedom
Null hypothesis probability = 7.614E-02
Photon flux (15-150 keV) in 64.00 sec: 4.604644E-02 ( -0.0123943 0.0124225 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29502e-07 ( -6.8768e-08 7.13536e-08 ) 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: 0.443841 ( -2.22552 1.30356 )
Epeak [keV] : 72.3372 ( -25.9494 9927.66 )
Norm@50keV : 1.295823E-03 ( -1.295823E-03 2.535451E-02) )
------------------------------------------------------------
Chi-Squared = 71.52765 using 59 PHA bins.
but latest trial 30.3011 gives Chi-Squared = 7.29523
Reduced chi-squared = 1.277279 for 56 degrees of freedom
Null hypothesis probability = 7.901E-02
Photon flux (15-150 keV) in 64.00 sec: 4.471765E-02 ( -0.0123616 0.0125008 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10042e-07 ( -7.30624e-08 3.95814e-08 ) 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 : -0.524593 ( -9.47541 2.05769 )
beta : -8.36447 ( -8.14297 0.679289 )
Epeak [keV] : 74.8105 ( -42.5710 9957.33 )
Norm@50keV : 1.173273E-03 ( -4.63844 2.02462 )
------------------------------------------------------------
Chi-Squared = 71.53919 using 59 PHA bins.
Reduced chi-squared = 1.300713 for 55 degrees of freedom
Null hypothesis probability = 6.629E-02
Photon flux (15-150 keV) in 64.00 sec: 4.467520E-02 ( -0.012327 0.0125452 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0953e-07 ( -7.25357e-08 7.75258e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 21:53:06 EST 2008