batgrbproduct Analysis for Trigger=154406
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 8 20:24:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger154406/GCN5_download_cron
======================================================================
Trigger: 00154406 Segment: 000
BAT Trigger Time: 148021624 [s; MET]
Trigger Stop: 148021688 [s; MET]
UTC: 2005-09-10T05:07:04.279280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.080743210929 Dec: -29.7748760183504 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33284
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33284
Flight Position: [ source = BAT ]
RA: 266.080743210929 Dec: -29.7748760183504 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.093880989468 Dec: -29.8776644511615 [deg; J2000]
{ 17h 44m 22.5s , -29d 52' 39.6" }
+/- 5.53470443570224 [arcmin] (estimated 90% radius based on SNR)
+/- 4.52256769129384 [arcmin] (formal 1-sigma fit error)
SNR: 2.63970201149488
RA = 17h 44m 22.5s (266.093881 deg.)
Dec = -29d 52' 40" (-29.877664 deg.)
Angular difference between Flight and Ground position is 6.205104 arcmin
Partial Coding Fraction: 0.8828125 [ 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 0.076412 0.063784 -0.028202 -0.016829
0.032092 0.029674 0.025246 0.022034 [error]
Peak 0.076412 0.063784 -0.028202 -0.016829
0.032092 0.029674 0.025246 0.022034 [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 1.58e-08 1.50e-08 9.83e-09 1.00e-08 4.47e-08 5.11e-08 erg/cm2
Error 1.32e-08 1.42e-08 1.38e-08 3.43e-08 4.09e-08 5.99e-08 erg/cm2
Peak flux Power-law 1.58e-02 8.36e-03 2.75e-03 1.16e-03 2.76e-02 2.81e-02 ph/cm2/s
Error 1.35e-02 7.83e-03 3.74e-03 3.50e-03 2.19e-02 2.25e-02 ph/cm2/s
Fluence Cutoff-PL 1.54e-08 2.54e-08 4.45e-09 1.98e-11 4.53e-08 4.54e-08 erg/cm2
Error 1.57e-08 1.95e-08 1.24e-08 9.72e-09 2.39e-08 3.17e-08 erg/cm2
Peak flux Cutoff-PL 1.46e-02 1.43e-02 1.45e-03 3.54e-06 3.04e-02 3.04e-02 ph/cm2/s
Error 1.54e-02 1.06e-02 3.58e-03 1.37e-03 2.00e-02 2.00e-02 ph/cm2/s
Fluence Band 1.61e-08 2.20e-08 8.52e-09 5.90e-10 4.76e-08 4.73e-08 erg/cm2
Error 1.39e-08 1.63e-08 1.33e-08 1.88e-08 3.23e-08 0.00e+00 erg/cm2
Peak flux Band 1.58e-02 1.31e-02 2.24e-03 4.18e-05 3.12e-02 3.12e-02 ph/cm2/s
Error 1.28e-02 9.14e-03 3.88e-03 1.46e-04 2.04e-02 2.04e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.596 1.621 - - 1.32e-04 1.47e-04 65.969 57
CPL -2.409 6.399 29.7 25.7 2.64e-01 3.76e-01 63.738 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.596 1.621 - - 1.32e-04 1.47e-04 65.969 57
CPL -2.409 6.464 29.7 25.7 2.64e-01 3.76e-01 63.738 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
266.0939 -29.8777 0.0728 18.9 32.7 0.1487 2.6 TRIG_00154406
------------------------------------------
Foreground time interval of the image:
0.000 33.012 (delta_t = 33.012 [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 33.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59640 ( -1.20516 2.03630 )
Norm@50keV : 1.323667E-04 ( -1.323667E-04 1.618187E-04) )
------------------------------------------------------------
Chi-Squared = 65.96857 using 59 PHA bins.
Reduced chi-squared = 1.157343 for 57 degrees of freedom
Null hypothesis probability = 0.195
Photon flux (15-150 keV) in 33.01 sec: 2.760321E-02 ( -0.0218578 0.0219431 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47272e-08 ( -3.66348e-08 4.5154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.012 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.40893 ( -0.591072 12.2069 )
Epeak [keV] : 29.7193 ( -29.7093 21.6109 )
Norm@50keV : 0.264475 ( -0.264475 0.487337 )
------------------------------------------------------------
Chi-Squared = 63.73784 using 59 PHA bins.
but latest trial 0.751769 gives Chi-Squared = 13.3430
Reduced chi-squared = 1.138176 for 56 degrees of freedom
Null hypothesis probability = 0.223
Photon flux (15-150 keV) in 33.01 sec: 3.040773E-02 ( -0.0195811 0.0204724 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52683e-08 ( -2.98938e-08 1.79112e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18493 ( -8.81507 6.18493 )
beta : -9.31432 ( -0.685681 19.3143 )
Epeak [keV] : 16.5656 ( -16.4656 9983.43 )
Norm@50keV : 1.519534E-03 ( -8.437912E-02 67.5318 )
------------------------------------------------------------
Chi-Squared = 64.75755 using 59 PHA bins.
Reduced chi-squared = 1.177410 for 55 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 33.01 sec: 3.115457E-02 ( -0.020436 0.020436 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75773e-08 ( -3.26593e-08 3.19187e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59640 ( -1.20516 2.03630 )
Norm@50keV : 1.323667E-04 ( -1.323667E-04 1.618187E-04) )
------------------------------------------------------------
Chi-Squared = 65.96857 using 59 PHA bins.
Reduced chi-squared = 1.157343 for 57 degrees of freedom
Null hypothesis probability = 0.195
Photon flux (15-150 keV) in 33.01 sec: 2.760321E-02 ( -0.0218578 0.0219431 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47272e-08 ( -3.66348e-08 4.5154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.012 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.40893 ( -0.591072 12.3362 )
Epeak [keV] : 29.7193 ( -29.7093 21.6109 )
Norm@50keV : 0.264475 ( -0.264475 0.487337 )
------------------------------------------------------------
Chi-Squared = 63.73784 using 59 PHA bins.
but latest trial 0.751769 gives Chi-Squared = 13.3430
Reduced chi-squared = 1.138176 for 56 degrees of freedom
Null hypothesis probability = 0.223
Photon flux (15-150 keV) in 33.01 sec: 3.040773E-02 ( -0.0195811 0.0204724 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52683e-08 ( -2.98938e-08 1.79112e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18493 ( -8.81507 6.18493 )
beta : -9.31432 ( -0.685681 19.3143 )
Epeak [keV] : 16.5656 ( -16.4656 9983.43 )
Norm@50keV : 1.519534E-03 ( -8.437912E-02 67.5318 )
------------------------------------------------------------
Chi-Squared = 64.75755 using 59 PHA bins.
Reduced chi-squared = 1.177410 for 55 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 33.01 sec: 3.115457E-02 ( -0.020436 0.020436 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75773e-08 ( -3.26593e-08 3.19187e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 20:40:17 EST 2008