batgrbproduct Analysis for Trigger=302454
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 Feb 5 00:23:44 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger302454/GCN5_download_cron
======================================================================
Trigger: 00302454 Segment: 000
BAT Trigger Time: 223807480 [s; MET]
Trigger Stop: 223807800 [s; MET]
UTC: 2008-02-04T08:44:37.449920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.301432208749 Dec: -26.6290428753778 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.5
Flight Position: [ source = BAT ]
RA: 267.301432208749 Dec: -26.6290428753778 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.328496182972 Dec: -26.6476820377467 [deg; J2000]
{ 17h 49m 18.8s , -26d 38' 51.7" }
+/- 3.31187825524826 [arcmin] (estimated 90% radius based on SNR)
+/- 2.29947373041398 [arcmin] (formal 1-sigma fit error)
SNR: 5.49737044471536
RA = 17h 49m 18.8s (267.328496 deg.)
Dec = -26d 38' 52" (-26.647682 deg.)
Angular difference between Flight and Ground position is 1.832344 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.992197 0.334001 -0.056894 -0.040344
0.114428 0.104918 0.093642 0.086259 [error]
Peak 0.992197 0.334001 -0.056894 -0.040344
0.114428 0.104918 0.093642 0.086259 [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 3.28e-07 1.47e-07 3.97e-08 1.32e-08 5.23e-07 5.28e-07 erg/cm2
Error 6.28e-08 5.52e-08 3.21e-08 2.02e-08 1.25e-07 1.32e-07 erg/cm2
Peak flux Power-law 3.50e-02 8.95e-03 1.21e-03 1.83e-04 4.52e-02 4.53e-02 ph/cm2/s
Error 6.78e-03 3.19e-03 1.19e-03 2.83e-04 8.78e-03 8.81e-03 ph/cm2/s
Fluence Cutoff-PL 3.63e-07 1.05e-07 6.42e-10 3.15e-15 4.69e-07 4.70e-07 erg/cm2
Error 7.04e-08 6.38e-08 1.77e-08 2.47e-09 9.85e-08 9.85e-08 erg/cm2
Peak flux Cutoff-PL 3.80e-02 6.93e-03 2.27e-05 5.56e-11 4.50e-02 4.50e-02 ph/cm2/s
Error 7.50e-03 3.77e-03 5.52e-04 3.88e-05 8.31e-03 8.33e-03 ph/cm2/s
Fluence Band 3.21e-07 1.59e-07 4.68e-08 1.68e-08 5.28e-07 5.79e-07 erg/cm2
Error 6.04e-08 3.54e-08 1.11e-07 1.22e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.59e-02 8.90e-03 5.01e-04 9.89e-06 4.53e-02 4.53e-02 ph/cm2/s
Error 6.82e-03 3.67e-03 8.32e-04 1.84e-04 8.53e-03 8.45e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.904 0.650 - - 7.96e-05 6.93e-05 53.396 57
CPL -0.330 0.000 12.4 9.2 1.94e-01 2.83e+01 50.453 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.904 0.650 - - 7.96e-05 6.93e-05 53.396 57
CPL -0.330 0.000 12.4 9.2 1.94e-01 2.83e+01 50.453 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.3285 -26.6477 0.0345 26.8 -16.4 1.6699 5.5 TRIG_00302454
------------------------------------------
Foreground time interval of the image:
0.000 127.470 (delta_t = 127.470 [sec])
129.000 320.000 (delta_t = 191.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 127.470000
129.000000 320.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.90430 ( -0.602718 0.697921 )
Norm@50keV : 7.964416E-05 ( -7.964416E-05 5.903347E-05) )
------------------------------------------------------------
Chi-Squared = 53.39557 using 59 PHA bins.
Reduced chi-squared = 0.9367643 for 57 degrees of freedom
Null hypothesis probability = 0.611
Photon flux (15-150 keV) in 318.5 sec: 4.524140E-02 ( -0.00875855 0.00879621 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23069e-07 ( -1.19727e-07 1.30843e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 127.470000
129.000000 320.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.330308 ( )
Epeak [keV] : 12.3876 ( -15.7745 2.68257 )
Norm@50keV : 0.193722 ( -14.7029 41.9031 )
------------------------------------------------------------
Chi-Squared = 50.45348 using 59 PHA bins.
Reduced chi-squared = 0.9009551 for 56 degrees of freedom
Null hypothesis probability = 0.684
Photon flux (15-150 keV) in 318.5 sec: 4.501104E-02 ( -0.00830712 0.00830362 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69055e-07 ( -9.14732e-08 1.05551e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 127.470000
129.000000 320.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55068 ( -5.24537 2.27158 )
beta : -8.74884 ( -0.708775 13.8932 )
Epeak [keV] : 11.3286 ( -11.2286 9988.67 )
Norm@50keV : 1.279182E-03 ( -1.093761E-02 7.910790E-03) )
------------------------------------------------------------
Chi-Squared = 64.86935 using 59 PHA bins.
Reduced chi-squared = 1.179443 for 55 degrees of freedom
Null hypothesis probability = 0.170
Photon flux (15-150 keV) in 318.5 sec: 4.532995E-02 ( -0.00854037 0.00850997 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28134e-07 ( -9.95854e-08 1.22785e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 129.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.90430 ( -0.602718 0.697921 )
Norm@50keV : 7.964416E-05 ( -7.964416E-05 5.903347E-05) )
------------------------------------------------------------
Chi-Squared = 53.39557 using 59 PHA bins.
Reduced chi-squared = 0.9367643 for 57 degrees of freedom
Null hypothesis probability = 0.611
Photon flux (15-150 keV) in 318.5 sec: 4.524140E-02 ( -0.00875855 0.00879621 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23069e-07 ( -1.19727e-07 1.30843e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 129.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.330308 ( )
Epeak [keV] : 12.3876 ( -15.7745 2.68257 )
Norm@50keV : 0.193722 ( -14.7029 41.9031 )
------------------------------------------------------------
Chi-Squared = 50.45348 using 59 PHA bins.
Reduced chi-squared = 0.9009551 for 56 degrees of freedom
Null hypothesis probability = 0.684
Photon flux (15-150 keV) in 318.5 sec: 4.501104E-02 ( -0.00830712 0.00830362 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69055e-07 ( -9.14732e-08 1.05551e-07 ) ergs/cm2
Band function
Time interval is from 129.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55068 ( -5.24537 2.27158 )
beta : -8.74884 ( -0.708775 0.591707 )
Epeak [keV] : 11.3286 ( -11.2286 9988.67 )
Norm@50keV : 1.279182E-03 ( -1.093761E-02 7.910790E-03) )
------------------------------------------------------------
Chi-Squared = 64.86935 using 59 PHA bins.
Reduced chi-squared = 1.179443 for 55 degrees of freedom
Null hypothesis probability = 0.170
Photon flux (15-150 keV) in 318.5 sec: 4.532995E-02 ( -0.00854037 0.00850997 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28134e-07 ( -9.95854e-08 1.22785e-07 ) ergs/cm2
Plot creation:
Tue Feb 5 00:50:15 EST 2008