batgrbproduct Analysis for Trigger=288384
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): Fri Dec 14 10:31:03 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger288384/GCN5_download_cron
======================================================================
Trigger: 00288384 Segment: 000
BAT Trigger Time: 210338367.936 [s; MET]
Trigger Stop: 210338369.984 [s; MET]
UTC: 2007-09-01T11:19:25.741640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.749312754491 Dec: -26.0779172689874 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 272.749312754491 Dec: -26.0779172689874 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.652238570071 Dec: -26.1643969144921 [deg; J2000]
{ 18h 10m 36.5s , -26d 09' 51.8" }
+/- 3.58097093803134 [arcmin] (estimated 90% radius based on SNR)
+/- 2.38953238082274 [arcmin] (formal 1-sigma fit error)
SNR: 4.91686937635568
RA = 18h 10m 36.5s (272.652239 deg.)
Dec = -26d 9' 52" (-26.164397 deg.)
Angular difference between Flight and Ground position is 7.366942 arcmin
Partial Coding Fraction: 0.5078125 [ 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 0.070663 0.009420 -0.019098 -0.012071
0.011799 0.010531 0.008974 0.007816 [error]
Peak 0.070663 0.009420 -0.019098 -0.012071
0.011799 0.010531 0.008974 0.007816 [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 2.41e-08 5.02e-09 5.20e-10 5.95e-11 2.96e-08 2.95e-08 erg/cm2
Error 6.94e-09 4.16e-09 1.11e-09 3.05e-10 1.07e-08 1.08e-08 erg/cm2
Peak flux Power-law 4.09e-01 4.95e-02 2.57e-03 1.40e-04 4.61e-01 4.61e-01 ph/cm2/s
Error 1.16e-01 3.92e-02 5.28e-03 6.66e-04 1.43e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 2.40e-08 5.00e-09 5.20e-10 5.90e-11 2.96e-08 2.95e-08 erg/cm2
Error 6.96e-09 4.16e-09 1.11e-09 3.03e-10 1.07e-08 1.08e-08 erg/cm2
Peak flux Cutoff-PL 4.08e-01 4.94e-02 2.57e-03 1.39e-04 4.61e-01 4.61e-01 ph/cm2/s
Error 1.16e-01 3.92e-02 5.27e-03 6.60e-04 1.43e-01 1.43e-01 ph/cm2/s
Fluence Band 2.34e-08 6.04e-09 7.26e-10 8.75e-11 3.14e-08 4.11e-08 erg/cm2
Error 8.53e-09 1.08e-08 1.75e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.20e-01 4.70e-02 1.02e-03 5.25e-06 4.68e-01 4.68e-01 ph/cm2/s
Error 1.17e-01 1.61e-02 4.76e-03 1.84e-03 1.32e-01 1.36e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.611 1.449 - - 1.59e-04 3.86e-04 73.284 57
CPL 1.289 0.000 3.6 0.0 5.22e-01 0.00e+00 72.168 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.611 1.449 - - 1.59e-04 3.86e-04 73.284 57
CPL 1.289 0.000 3.6 0.0 5.22e-01 0.00e+00 72.168 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
272.6522 -26.1644 0.0390 39.7 1.5 0.0998 4.9 TRIG_00288384
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-60.936 -7.936 (delta_t = 53.000 [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: 5.61128 ( -1.52722 1.36998 )
Norm@50keV : 1.587757E-04 ( -1.587757E-04 6.128710E-04) )
------------------------------------------------------------
Chi-Squared = 73.28402 using 59 PHA bins.
Reduced chi-squared = 1.285685 for 57 degrees of freedom
Null hypothesis probability = 7.197E-02
Photon flux (15-150 keV) in 2.048 sec: 0.461028 ( -0.142384 0.143449 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96305e-08 ( -1.02554e-08 1.11819e-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: 1.28899 ( )
Epeak [keV] : 3.59928 ( )
Norm@50keV : 0.521889 ( )
------------------------------------------------------------
Chi-Squared = 72.16829 using 59 PHA bins.
Reduced chi-squared = 1.288719 for 56 degrees of freedom
Null hypothesis probability = 7.172E-02
Photon flux (15-150 keV) in 2.048 sec: 0.460602 ( -0.142347 0.143394 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96202e-08 ( -1.02598e-08 1.11958e-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 : -8.31467 ( -0.988742 4.77716 )
beta : -5.26901 ( -2.41105 3.19268 )
Epeak [keV] : 8.31203 ( -8.20335 7.57887 )
Norm@50keV : 3.134730E-02 ( -10.6289 13070.0 )
------------------------------------------------------------
Chi-Squared = 73.11765 using 59 PHA bins.
Reduced chi-squared = 1.329412 for 55 degrees of freedom
Null hypothesis probability = 5.160E-02
Photon flux (15-150 keV) in 2.048 sec: 0.467855 ( -0.133527 0.129855 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14352e-08 ( -1.11757e-08 1.04069e-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: 5.61128 ( -1.52722 1.36998 )
Norm@50keV : 1.587757E-04 ( -1.587757E-04 6.128710E-04) )
------------------------------------------------------------
Chi-Squared = 73.28402 using 59 PHA bins.
Reduced chi-squared = 1.285685 for 57 degrees of freedom
Null hypothesis probability = 7.197E-02
Photon flux (15-150 keV) in 2.048 sec: 0.461028 ( -0.142384 0.143449 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96305e-08 ( -1.02554e-08 1.11819e-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: 1.28899 ( )
Epeak [keV] : 3.59928 ( )
Norm@50keV : 0.521889 ( )
------------------------------------------------------------
Chi-Squared = 72.16829 using 59 PHA bins.
Reduced chi-squared = 1.288719 for 56 degrees of freedom
Null hypothesis probability = 7.172E-02
Photon flux (15-150 keV) in 2.048 sec: 0.460602 ( -0.142347 0.143394 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96202e-08 ( -1.02598e-08 1.11958e-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 : -8.31467 ( -0.988742 4.77716 )
beta : -5.26901 ( -2.41105 3.19268 )
Epeak [keV] : 8.31203 ( -8.20335 7.57887 )
Norm@50keV : 3.134730E-02 ( -10.6289 13070.0 )
------------------------------------------------------------
Chi-Squared = 73.11765 using 59 PHA bins.
Reduced chi-squared = 1.329412 for 55 degrees of freedom
Null hypothesis probability = 5.160E-02
Photon flux (15-150 keV) in 2.048 sec: 0.467855 ( -0.133527 0.129855 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14352e-08 ( -1.11757e-08 1.04069e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 10:37:46 EST 2007