batgrbproduct Analysis for Trigger=292886
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 16:36:19 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger292886/GCN5_download_cron
======================================================================
Trigger: 00292886 Segment: 000
BAT Trigger Time: 213030704 [s; MET]
Trigger Stop: 213030768 [s; MET]
UTC: 2007-10-02T15:11:41.735960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.133865750616 Dec: -61.1386757374294 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.32
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.32
Flight Position: [ source = BAT ]
RA: 188.133865750616 Dec: -61.1386757374294 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.119406277722 Dec: -61.1315164056052 [deg; J2000]
{ 12h 32m 28.7s , -61d 07' 53.5" }
+/- 3.13765820022105 [arcmin] (estimated 90% radius based on SNR)
+/- 1.64105735914615 [arcmin] (formal 1-sigma fit error)
SNR: 5.93856839580755
RA = 12h 32m 28.7s (188.119406 deg.)
Dec = -61d 7' 53" (-61.131516 deg.)
Angular difference between Flight and Ground position is 0.599940 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.302448 0.167039 -0.060819 -0.012792
0.037632 0.037281 0.032293 0.028726 [error]
Peak 0.302448 0.167039 -0.060819 -0.012792
0.037632 0.037281 0.032293 0.028726 [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 7.40e-08 5.73e-08 2.98e-08 2.23e-08 1.71e-07 1.84e-07 erg/cm2
Error 1.62e-08 1.72e-08 1.72e-08 2.33e-08 4.83e-08 6.03e-08 erg/cm2
Peak flux Power-law 3.85e-02 1.67e-02 4.34e-03 1.39e-03 6.04e-02 6.09e-02 ph/cm2/s
Error 8.51e-03 4.81e-03 2.43e-03 1.60e-03 1.31e-02 1.34e-02 ph/cm2/s
Fluence Cutoff-PL 7.41e-08 5.74e-08 2.98e-08 2.21e-08 1.71e-07 1.83e-07 erg/cm2
Error 1.62e-08 1.72e-08 1.72e-08 2.31e-08 4.83e-08 6.02e-08 erg/cm2
Peak flux Cutoff-PL 4.13e-02 2.12e-02 6.29e-04 1.34e-07 6.32e-02 6.32e-02 ph/cm2/s
Error 9.16e-03 6.58e-03 1.14e-03 8.94e-06 1.22e-02 1.22e-02 ph/cm2/s
Fluence Band 6.94e-08 6.76e-08 1.27e-08 5.71e-10 1.61e-07 2.76e-07 erg/cm2
Error 2.02e-08 7.64e-09 3.36e-09 3.63e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.83e-02 1.70e-02 3.43e-03 1.03e-04 6.29e-02 6.22e-02 ph/cm2/s
Error 8.09e-03 3.74e-03 6.62e-04 1.24e-02 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 2.938 0.482 - - 2.30e-04 1.01e-04 56.752 57
CPL -2.490 0.000 22.4 4.3 2.22e+00 2.64e+00 45.723 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.938 0.482 - - 2.30e-04 1.01e-04 56.752 57
CPL -2.490 0.000 22.4 4.3 2.22e+00 2.64e+00 45.723 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
188.1194 -61.1315 0.0325 6.9 -11.9 0.4169 5.9 TRIG_00292886
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93836 ( -0.429934 0.534871 )
Norm@50keV : 2.297634E-04 ( -9.628797E-05 1.059073E-04) )
------------------------------------------------------------
Chi-Squared = 56.75190 using 59 PHA bins.
Reduced chi-squared = 0.9956474 for 57 degrees of freedom
Null hypothesis probability = 0.484
Photon flux (15-150 keV) in 64.00 sec: 6.038606E-02 ( -0.0130754 0.0131977 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71345e-07 ( -4.58291e-08 5.07757e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49039 ( )
Epeak [keV] : 22.4342 ( -4.76966 3.74598 )
Norm@50keV : 2.22046 ( -2.40459 2.88072 )
------------------------------------------------------------
Chi-Squared = 45.72277 using 59 PHA bins.
but latest trial 17.6394 gives Chi-Squared = 4.57073
Reduced chi-squared = 0.8164781 for 56 degrees of freedom
Null hypothesis probability = 0.835
Photon flux (15-150 keV) in 64.00 sec: 6.322169E-02 ( -0.0122357 0.0122449 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71407e-07 ( -4.58694e-08 5.07296e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59696 ( -2.88169 2.71842 )
beta : -8.55328 ( -0.628518 19.3715 )
Epeak [keV] : 10.3687 ( -4.72932 36.7120 )
Norm@50keV : 1.793670E-03 ( -2.70587 117.737 )
------------------------------------------------------------
Chi-Squared = 52.31768 using 59 PHA bins.
Reduced chi-squared = 0.9512305 for 55 degrees of freedom
Null hypothesis probability = 0.578
Photon flux (15-150 keV) in 64.00 sec: 6.292139E-02 ( -0.0118417 0.0129771 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60623e-07 ( -3.26778e-08 3.9943e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93836 ( -0.429934 0.534871 )
Norm@50keV : 2.297634E-04 ( -9.628797E-05 1.059073E-04) )
------------------------------------------------------------
Chi-Squared = 56.75190 using 59 PHA bins.
Reduced chi-squared = 0.9956474 for 57 degrees of freedom
Null hypothesis probability = 0.484
Photon flux (15-150 keV) in 64.00 sec: 6.038606E-02 ( -0.0130754 0.0131977 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71345e-07 ( -4.58291e-08 5.07757e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49039 ( )
Epeak [keV] : 22.4342 ( -4.76966 3.74598 )
Norm@50keV : 2.22046 ( -2.40459 2.88072 )
------------------------------------------------------------
Chi-Squared = 45.72277 using 59 PHA bins.
but latest trial 17.6394 gives Chi-Squared = 4.57073
Reduced chi-squared = 0.8164781 for 56 degrees of freedom
Null hypothesis probability = 0.835
Photon flux (15-150 keV) in 64.00 sec: 6.322169E-02 ( -0.0122357 0.0122449 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71407e-07 ( -4.58694e-08 5.07296e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59696 ( -2.88169 2.71842 )
beta : -8.55328 ( -0.628518 19.3715 )
Epeak [keV] : 10.3687 ( -4.72932 36.7120 )
Norm@50keV : 1.793670E-03 ( -2.70587 117.737 )
------------------------------------------------------------
Chi-Squared = 52.31768 using 59 PHA bins.
Reduced chi-squared = 0.9512305 for 55 degrees of freedom
Null hypothesis probability = 0.578
Photon flux (15-150 keV) in 64.00 sec: 6.292139E-02 ( -0.0118417 0.0129771 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60623e-07 ( -3.26778e-08 3.9943e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 16:46:46 EST 2007