batgrbproduct Analysis for Trigger=282535
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 02:48:50 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger282535/GCN5_download_cron
======================================================================
Trigger: 00282535 Segment: 000
BAT Trigger Time: 203829048 [s; MET]
Trigger Stop: 203829160 [s; MET]
UTC: 2007-06-18T03:10:45.970880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.759572714913 Dec: -30.360468349832 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 264.759572714913 Dec: -30.360468349832 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.768580003612 Dec: -30.3419527914959 [deg; J2000]
{ 17h 39m 04.5s , -30d 20' 31.0" }
+/- 4.84296696826873 [arcmin] (estimated 90% radius based on SNR)
+/- 3.13236853590449 [arcmin] (formal 1-sigma fit error)
SNR: 3.19438792705069
RA = 17h 39m 4.5s (264.768580 deg.)
Dec = -30d 20' 31" (-30.341953 deg.)
Angular difference between Flight and Ground position is 1.204853 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 112 +/-
Measured from: 0
to: 112 [s; relative to TRIGTIME]
T50: 112 +/-
Measured from: 0
to: 112 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 112 second)
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.053818 0.076589 0.028270 0.028824
0.036897 0.030392 0.025626 0.022196 [error]
Peak 0.053818 0.076589 0.028270 0.028824
0.036897 0.030392 0.025626 0.022196 [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 1.51e-08 2.62e-08 3.46e-08 9.31e-08 1.01e-07 1.72e-07 erg/cm2
Error 1.48e-08 2.03e-08 3.03e-08 2.44e-07 6.12e-08 2.78e-07 erg/cm2
Peak flux Power-law 1.47e-02 1.40e-02 9.26e-03 9.51e-03 4.19e-02 4.75e-02 ph/cm2/s
Error 1.48e-02 1.10e-02 6.73e-03 2.14e-02 3.27e-02 2.53e-02 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.78e-02 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.597 1.401 - - 3.26e-04 2.52e-04 36.073 57
CPL 1.492 0.000 192.7 0.0 3.77e-04 0.00e+00 36.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.597 1.401 - - 3.26e-04 2.52e-04 36.073 57
CPL 1.492 0.000 192.7 0.0 3.77e-04 0.00e+00 36.160 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 112.000 0.000 112.000
T90 112.000 0.000 112.000
T50 112.000 0.000 112.000
Peak 112.000 0.000 112.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.7686 -30.3420 0.0605 18.4 26.3 0.2139 3.2 TRIG_00282535
------------------------------------------
Foreground time interval of the image:
0.000 33.117 (delta_t = 33.117 [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 33.117 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59725 ( -1.45084 1.35202 )
Norm@50keV : 3.263042E-04 ( -3.263042E-04 1.784490E-04) )
------------------------------------------------------------
Chi-Squared = 36.07262 using 59 PHA bins.
Reduced chi-squared = 0.6328530 for 57 degrees of freedom
Null hypothesis probability = 0.986
Photon flux (15-150 keV) in 33.12 sec: 4.189997E-02 ( -0.0419 0.0234174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01084e-07 ( -5.89672e-08 6.3504e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.117 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49196 ( )
Epeak [keV] : 192.742 ( )
Norm@50keV : 3.766834E-04 ( )
------------------------------------------------------------
Chi-Squared = 36.15982 using 59 PHA bins.
Reduced chi-squared = 0.6457111 for 56 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 33.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.117 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31350 ( -8.68650 6.31350 )
beta : -1.58594 ( -8.41406 1.43969 )
Epeak [keV] : 20.8357 ( -20.7357 9979.16 )
Norm@50keV : 7.031635E-04 ( -7.031635E-04 248.964 )
------------------------------------------------------------
Chi-Squared = 36.07301 using 59 PHA bins.
Reduced chi-squared = 0.6558729 for 55 degrees of freedom
Null hypothesis probability = 0.977
Photon flux (15-150 keV) in 33.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.117 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59725 ( -1.45084 1.35202 )
Norm@50keV : 3.263042E-04 ( -3.263042E-04 1.784490E-04) )
------------------------------------------------------------
Chi-Squared = 36.07262 using 59 PHA bins.
Reduced chi-squared = 0.6328530 for 57 degrees of freedom
Null hypothesis probability = 0.986
Photon flux (15-150 keV) in 33.12 sec: 4.189997E-02 ( -0.0419 0.0234174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01084e-07 ( -5.89672e-08 6.3504e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.117 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49196 ( )
Epeak [keV] : 192.742 ( )
Norm@50keV : 3.766834E-04 ( )
------------------------------------------------------------
Chi-Squared = 36.15982 using 59 PHA bins.
Reduced chi-squared = 0.6457111 for 56 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 33.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.117 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31350 ( -8.68650 6.31350 )
beta : -1.58594 ( -8.41406 1.43969 )
Epeak [keV] : 20.8357 ( -20.7357 9979.16 )
Norm@50keV : 7.031635E-04 ( -7.031635E-04 248.964 )
------------------------------------------------------------
Chi-Squared = 36.07301 using 59 PHA bins.
Reduced chi-squared = 0.6558729 for 55 degrees of freedom
Null hypothesis probability = 0.977
Photon flux (15-150 keV) in 33.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 02:53:20 EST 2007