batgrbproduct Analysis for Trigger=152451
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 18:42:56 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152451/SDC
======================================================================
Trigger: 00152451 Segment: 000
BAT Trigger Time: 146934576.32 [s; MET]
Trigger Stop: 146934578.368 [s; MET]
UTC: 2005-08-28T15:09:36.621260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.045642383103 Dec: -24.9248579946582 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33487
Image Trigger?: NO
Rate S/N Ratio: 11.4017542509914 [ if not an image trigger ]
Image S/N Ratio: 33487
Flight Position: [ source = BAT ]
RA: 285.045642383103 Dec: -24.9248579946582 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.064643936565 Dec: -24.9659057260806 [deg; J2000]
{ 19h 00m 15.5s , -24d 57' 57.3" }
+/- 5.45315328630901 [arcmin] (estimated 90% radius based on SNR)
+/- 3.50904846177839 [arcmin] (formal 1-sigma fit error)
SNR: 2.69627704708075
RA = 19h 0m 15.5s (285.064644 deg.)
Dec = -24d 57' 57" (-24.965906 deg.)
Angular difference between Flight and Ground position is 2.671012 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
T50: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800000786781 second)
Measured from: -1.49011611938477e-08
to: 2.04799999296665 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105399 -0.014333 -0.009935 -0.018036
0.015225 0.011860 0.009885 0.008513 [error]
Peak 0.105399 -0.014333 -0.009935 -0.018036
0.015225 0.011860 0.009885 0.008513 [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 3.18e-08 4.47e-09 2.81e-10 1.88e-11 3.65e-08 3.65e-08 erg/cm2
Error 8.53e-09 3.48e-09 5.56e-10 8.20e-11 1.14e-08 1.14e-08 erg/cm2
Peak flux Power-law 5.47e-01 4.49e-02 1.42e-03 4.59e-05 5.94e-01 5.92e-01 ph/cm2/s
Error 1.44e-01 3.36e-02 2.72e-03 1.90e-04 1.66e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 3.18e-08 4.45e-09 2.80e-10 1.86e-11 3.65e-08 3.65e-08 erg/cm2
Error 8.54e-09 3.48e-09 5.55e-10 8.13e-11 1.14e-08 1.14e-08 erg/cm2
Peak flux Cutoff-PL 5.47e-01 4.49e-02 1.41e-03 4.56e-05 5.93e-01 5.93e-01 ph/cm2/s
Error 1.43e-01 3.36e-02 2.71e-03 1.88e-04 1.66e-01 1.66e-01 ph/cm2/s
Fluence Band 1.04e-08 2.92e-09 1.26e-10 2.11e-12 3.90e-08 3.59e-08 erg/cm2
Error 1.08e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.47e-01 4.49e-02 1.41e-03 4.56e-05 5.93e-01 5.93e-01 ph/cm2/s
Error 1.43e-01 3.35e-02 2.71e-03 1.88e-04 1.66e-01 1.66e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.700 1.299 - - 2.00e-04 2.36e-04 72.734 57
CPL -0.880 0.000 8.2 6.5 1.06e+02 1.87e+04 69.699 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.700 1.299 - - 2.00e-04 2.36e-04 72.734 57
CPL -0.880 0.000 8.2 6.5 1.06e+02 1.87e+04 69.699 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 -0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.0646 -24.9659 0.0717 28.4 85.0 0.0899 2.7 TRIG_00152451
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-10.320 -8.320 (delta_t = 2.000 [sec])
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 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.69981 ( -0.816398 1.78199 )
Norm@50keV : 1.996819E-04 ( -1.996819E-04 2.721347E-04) )
------------------------------------------------------------
Chi-Squared = 72.73378 using 59 PHA bins.
Reduced chi-squared = 1.276031 for 57 degrees of freedom
Null hypothesis probability = 7.816E-02
Photon flux (15-150 keV) in 2.048 sec: 0.593643 ( -0.165959 0.166958 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65414e-08 ( -1.11165e-08 1.16394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.879790 ( )
Epeak [keV] : 8.23909 ( -10.7052 2.32135 )
Norm@50keV : 105.679 ( -7134.35 30275.3 )
------------------------------------------------------------
Chi-Squared = 69.69935 using 59 PHA bins.
Reduced chi-squared = 1.244631 for 56 degrees of freedom
Null hypothesis probability = 0.103
Photon flux (15-150 keV) in 2.048 sec: 0.592932 ( -0.165894 0.166906 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65179e-08 ( -1.11174e-08 1.16433e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.43122 ( -1.56878 13.4312 )
beta : -5.99934 ( -1.42920 1.08561 )
Epeak [keV] : 9997.50 ( -9997.40 2.50000 )
Norm@50keV : 1.960732E-02 ( -1.960732E-02 4.265863E-02) )
------------------------------------------------------------
Chi-Squared = 72.56900 using 59 PHA bins.
Reduced chi-squared = 1.319436 for 55 degrees of freedom
Null hypothesis probability = 5.635E-02
Photon flux (15-150 keV) in 2.048 sec: 0.592924 ( -0.165888 0.166911 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9024e-08 ( -1.03305e-08 1.12878e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.69981 ( -0.816398 1.78199 )
Norm@50keV : 1.996819E-04 ( -1.996819E-04 2.721347E-04) )
------------------------------------------------------------
Chi-Squared = 72.73378 using 59 PHA bins.
Reduced chi-squared = 1.276031 for 57 degrees of freedom
Null hypothesis probability = 7.816E-02
Photon flux (15-150 keV) in 2.048 sec: 0.593643 ( -0.165959 0.166958 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65414e-08 ( -1.11165e-08 1.16394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.879790 ( )
Epeak [keV] : 8.23909 ( -10.7052 2.32135 )
Norm@50keV : 105.679 ( -7134.35 30275.3 )
------------------------------------------------------------
Chi-Squared = 69.69935 using 59 PHA bins.
Reduced chi-squared = 1.244631 for 56 degrees of freedom
Null hypothesis probability = 0.103
Photon flux (15-150 keV) in 2.048 sec: 0.592932 ( -0.165894 0.166906 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65179e-08 ( -1.11174e-08 1.16433e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.43122 ( -1.56878 13.4312 )
beta : -5.99934 ( -1.42920 1.08561 )
Epeak [keV] : 9997.50 ( -9997.40 2.50000 )
Norm@50keV : 1.960732E-02 ( -1.960732E-02 4.265863E-02) )
------------------------------------------------------------
Chi-Squared = 72.56900 using 59 PHA bins.
Reduced chi-squared = 1.319436 for 55 degrees of freedom
Null hypothesis probability = 5.635E-02
Photon flux (15-150 keV) in 2.048 sec: 0.592924 ( -0.165888 0.166911 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9024e-08 ( -1.03305e-08 1.12878e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 18:47:36 EST 2008