batgrbproduct Analysis for Trigger=274153
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): Thu Dec 13 16:58:26 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger274153/GCN5_download_hand
======================================================================
Trigger: 00274153 Segment: 000
BAT Trigger Time: 197513440.32 [s; MET]
Trigger Stop: 197513440.576 [s; MET]
UTC: 2007-04-06T00:50:39.189180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 198.964 Dec: 16.525 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.26
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.26
Flight Position: [ source = BAT ]
RA: 198.964 Dec: 16.525 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 198.988103723091 Dec: 16.5147694214311 [deg; J2000]
{ 13h 15m 57.1s , +16d 30' 53.2" }
+/- 3.44352807250653 [arcmin] (estimated 90% radius based on SNR)
+/- 2.40647059754012 [arcmin] (formal 1-sigma fit error)
SNR: 5.19960485092065
RA = 13h 15m 57.1s (198.988104 deg.)
Dec = 16d 30' 53" (16.514769 deg.)
Angular difference between Flight and Ground position is 1.516326 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 0.256000012159348 +/- 2.23606797749979
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
T50: 0.256000012159348 +/- 1
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.256000012159348 second)
Measured from: 1.49011611938477e-08
to: 0.256000027060509 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001499 0.007258 0.016044 0.004682
0.002769 0.002828 0.002525 0.002277 [error]
Peak 0.001499 0.007258 0.016044 0.004682
0.002769 0.002828 0.002525 0.002277 [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 1.01e-09 3.45e-09 9.74e-09 8.32e-08 2.68e-08 9.81e-08 erg/cm2
Error 6.48e-10 1.35e-09 2.21e-09 4.54e-08 6.11e-09 4.33e-08 erg/cm2
Peak flux Power-law 1.25e-01 2.29e-01 3.23e-01 9.54e-01 9.24e-01 1.63e+00 ph/cm2/s
Error 8.10e-02 9.26e-02 7.38e-02 4.69e-01 2.38e-01 4.48e-01 ph/cm2/s
Fluence Cutoff-PL 4.65e-10 3.20e-09 1.19e-08 2.12e-08 2.62e-08 3.77e-08 erg/cm2
Error 7.05e-10 1.55e-09 3.33e-09 5.42e-08 6.54e-09 5.02e-08 erg/cm2
Peak flux Cutoff-PL 5.39e-02 2.03e-01 3.94e-01 3.51e-01 8.66e-01 1.00e+00 ph/cm2/s
Error 7.90e-02 1.12e-01 1.11e-01 5.37e-01 2.36e-01 5.81e-01 ph/cm2/s
Fluence Band 4.50e-10 3.20e-09 1.18e-08 3.48e-08 2.60e-08 4.05e-08 erg/cm2
Error 6.85e-10 2.52e-09 3.02e-09 5.59e-08 6.58e-09 0.00e+00 erg/cm2
Peak flux Band 5.40e-02 2.03e-01 3.94e-01 3.52e-01 8.66e-01 1.00e+00 ph/cm2/s
Error 7.99e-02 1.19e-01 1.15e-01 5.19e-01 2.41e-01 6.02e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.506 0.456 - - 7.81e-03 2.34e-03 47.790 57
CPL -1.428 0.000 124.8 4957.1 3.48e-02 6.35e-02 45.835 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.506 0.456 - - 7.81e-03 2.34e-03 47.790 57
CPL -1.428 0.000 124.8 4957.1 3.48e-02 6.35e-02 45.835 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 0.256 0.000 0.256
T90 0.256 0.000 0.256
T50 0.256 0.000 0.256
Peak 0.256 0.000 0.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
198.9881 +16.5148 0.0369 23.6 177.7 0.0266 5.2 TRIG_00274153
------------------------------------------
Foreground time interval of the image:
0.000 0.256 (delta_t = 0.256 [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 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.506177 ( -0.494588 0.417753 )
Norm@50keV : 7.810020E-03 ( -2.403144E-03 2.279209E-03) )
------------------------------------------------------------
Chi-Squared = 47.78978 using 59 PHA bins.
Reduced chi-squared = 0.8384171 for 57 degrees of freedom
Null hypothesis probability = 0.803
Photon flux (15-150 keV) in 0.2560 sec: 0.924036 ( -0.234203 0.241384 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67825e-08 ( -6.1077e-09 6.11226e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42760 ( )
Epeak [keV] : 124.771 ( -38.9407 9875.20 )
Norm@50keV : 3.481806E-02 ( -3.542233E-02 9.157181E-02) )
------------------------------------------------------------
Chi-Squared = 45.83501 using 59 PHA bins.
but latest trial 0.126994 gives Chi-Squared = 3.04968
Reduced chi-squared = 0.8184824 for 56 degrees of freedom
Null hypothesis probability = 0.832
Photon flux (15-150 keV) in 0.2560 sec: 0.865888 ( -0.222519 0.249162 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61745e-08 ( -6.59515e-09 6.49216e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99282 ( -2.09536 1.81023 )
beta : -0.506093 ( -0.702618 9.04940 )
Epeak [keV] : 9993.01 ( -33.6954 9873.71 )
Norm@50keV : 7.807403E-03 ( -3.403415E-02 294.934 )
------------------------------------------------------------
Chi-Squared = 47.78979 using 59 PHA bins.
Reduced chi-squared = 0.8689052 for 55 degrees of freedom
Null hypothesis probability = 0.744
Photon flux (15-150 keV) in 0.2560 sec: 0.866096 ( -0.233558 0.248914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59569e-08 ( -6.46546e-09 6.68698e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.506177 ( -0.494588 0.417753 )
Norm@50keV : 7.810020E-03 ( -2.403144E-03 2.279209E-03) )
------------------------------------------------------------
Chi-Squared = 47.78978 using 59 PHA bins.
Reduced chi-squared = 0.8384171 for 57 degrees of freedom
Null hypothesis probability = 0.803
Photon flux (15-150 keV) in 0.2560 sec: 0.924036 ( -0.234203 0.241384 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67825e-08 ( -6.1077e-09 6.11226e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42760 ( )
Epeak [keV] : 124.771 ( -38.9407 9875.20 )
Norm@50keV : 3.481806E-02 ( -3.542233E-02 9.157181E-02) )
------------------------------------------------------------
Chi-Squared = 45.83501 using 59 PHA bins.
but latest trial 0.126994 gives Chi-Squared = 3.04968
Reduced chi-squared = 0.8184824 for 56 degrees of freedom
Null hypothesis probability = 0.832
Photon flux (15-150 keV) in 0.2560 sec: 0.865888 ( -0.222519 0.249162 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61745e-08 ( -6.59515e-09 6.49216e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99282 ( -2.09536 1.81023 )
beta : -0.506093 ( -0.702618 9.04957 )
Epeak [keV] : 9993.01 ( -33.6954 9873.71 )
Norm@50keV : 7.807403E-03 ( -3.403415E-02 294.934 )
------------------------------------------------------------
Chi-Squared = 47.78979 using 59 PHA bins.
Reduced chi-squared = 0.8689052 for 55 degrees of freedom
Null hypothesis probability = 0.744
Photon flux (15-150 keV) in 0.2560 sec: 0.866096 ( -0.233558 0.248914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59569e-08 ( -6.46546e-09 6.68698e-09 ) ergs/cm2
Plot creation:
Thu Dec 13 17:02:50 EST 2007