batgrbproduct Analysis for Trigger=215914
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 1 18:59:07 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215914/GCN5_download_cron
======================================================================
Trigger: 00215914 Segment: 000
BAT Trigger Time: 172873200 [s; MET]
Trigger Stop: 172873264 [s; MET]
UTC: 2006-06-24T20:19:58.723720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.118263346805 Dec: -45.1600310930876 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.34
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.34
Flight Position: [ source = BAT ]
RA: 252.118263346805 Dec: -45.1600310930876 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.069962783602 Dec: -45.1348561546014 [deg; J2000]
{ 16h 48m 16.8s , -45d 08' 05.5" }
+/- 5.22559239121379 [arcmin] (estimated 90% radius based on SNR)
+/- 3.68762596887018 [arcmin] (formal 1-sigma fit error)
SNR: 2.86556641811487
RA = 16h 48m 16.8s (252.069963 deg.)
Dec = -45d 8' 5" (-45.134856 deg.)
Angular difference between Flight and Ground position is 2.541513 arcmin
Partial Coding Fraction: 0.1582031 [ 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 0.274270 0.191397 0.078639 -0.033398
0.079627 0.079853 0.069499 0.061670 [error]
Peak 0.274270 0.191397 0.078639 -0.033398
0.079627 0.079853 0.069499 0.061670 [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 8.67e-08 9.11e-08 6.76e-08 8.12e-08 2.77e-07 3.26e-07 erg/cm2
Error 4.35e-08 4.32e-08 5.68e-08 1.45e-07 1.42e-07 2.26e-07 erg/cm2
Peak flux Power-law 8.64e-02 5.05e-02 1.87e-02 9.22e-03 1.60e-01 1.65e-01 ph/cm2/s
Error 4.41e-02 2.33e-02 1.53e-02 1.52e-02 6.72e-02 6.96e-02 ph/cm2/s
Fluence Cutoff-PL 7.72e-08 1.13e-07 6.20e-08 9.46e-09 2.61e-07 2.61e-07 erg/cm2
Error 6.35e-08 6.20e-08 6.78e-08 1.23e-07 1.32e-07 1.37e-07 erg/cm2
Peak flux Cutoff-PL 7.54e-02 6.22e-02 1.80e-02 1.48e-03 1.57e-01 1.57e-01 ph/cm2/s
Error 6.34e-02 3.28e-02 1.90e-02 1.29e-02 6.75e-02 6.81e-02 ph/cm2/s
Fluence Band 7.64e-08 1.12e-07 6.23e-08 9.94e-09 2.61e-07 2.65e-07 erg/cm2
Error 6.24e-08 7.86e-08 6.78e-08 1.22e-07 1.15e-07 0.00e+00 erg/cm2
Peak flux Band 7.58e-02 6.19e-02 1.81e-02 1.55e-03 1.57e-01 1.58e-01 ph/cm2/s
Error 5.83e-02 2.39e-02 1.38e-02 1.27e-02 6.57e-02 6.59e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.430 0.922 - - 8.52e-04 6.97e-04 54.637 57
CPL 0.664 2.781 30.3 5000.0 9.58e-03 7.27e-01 53.878 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.430 0.922 - - 8.52e-04 6.97e-04 54.637 57
CPL 0.664 2.543 30.3 5000.0 9.58e-03 7.27e-01 53.878 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
252.0700 -45.1349 0.0669 43.9 38.0 0.5039 2.9 TRIG_00215914
------------------------------------------
Foreground time interval of the image:
0.000 33.038 (delta_t = 33.038 [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 33.038 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42978 ( -0.744111 1.10084 )
Norm@50keV : 8.521544E-04 ( -8.521544E-04 5.428362E-04) )
------------------------------------------------------------
Chi-Squared = 54.63710 using 59 PHA bins.
Reduced chi-squared = 0.9585456 for 57 degrees of freedom
Null hypothesis probability = 0.564
Photon flux (15-150 keV) in 33.04 sec: 0.160442 ( -0.0671989 0.067224 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76609e-07 ( -1.35069e-07 1.49049e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.038 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.664140 ( -3.66414 1.89843 )
Epeak [keV] : 30.3383 ( -30.3283 9969.66 )
Norm@50keV : 9.580035E-03 ( -9.580035E-03 1.44367 )
------------------------------------------------------------
Chi-Squared = 53.87791 using 59 PHA bins.
Reduced chi-squared = 0.9621056 for 56 degrees of freedom
Null hypothesis probability = 0.556
Photon flux (15-150 keV) in 33.04 sec: 0.156973 ( -0.0679049 0.067143 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60834e-07 ( -1.18998e-07 1.45944e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.038 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23820 ( -8.76180 4.11543 )
beta : -9.10796 ( -0.892038 7.32114 )
Epeak [keV] : 26.4649 ( -26.3649 9973.54 )
Norm@50keV : 4.304489E-03 ( -4.304489E-03 1.949901E+06) )
------------------------------------------------------------
Chi-Squared = 53.94757 using 59 PHA bins.
Reduced chi-squared = 0.9808650 for 55 degrees of freedom
Null hypothesis probability = 0.515
Photon flux (15-150 keV) in 33.04 sec: 0.157036 ( -0.064188 0.067171 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60978e-07 ( -1.17237e-07 1.12569e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.038 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42978 ( -0.744111 1.10084 )
Norm@50keV : 8.521544E-04 ( -8.521544E-04 5.428362E-04) )
------------------------------------------------------------
Chi-Squared = 54.63710 using 59 PHA bins.
Reduced chi-squared = 0.9585456 for 57 degrees of freedom
Null hypothesis probability = 0.564
Photon flux (15-150 keV) in 33.04 sec: 0.160442 ( -0.0671989 0.067224 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76609e-07 ( -1.35069e-07 1.49049e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.038 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.664140 ( -3.66414 1.42246 )
Epeak [keV] : 30.3383 ( -30.3283 9969.66 )
Norm@50keV : 9.580035E-03 ( -9.580035E-03 1.44367 )
------------------------------------------------------------
Chi-Squared = 53.87791 using 59 PHA bins.
but latest trial 2.07128 gives Chi-Squared = 1.34961
Reduced chi-squared = 0.9621056 for 56 degrees of freedom
Null hypothesis probability = 0.556
Photon flux (15-150 keV) in 33.04 sec: 0.156973 ( -0.0679049 0.067143 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60834e-07 ( -1.18998e-07 1.45944e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.038 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23820 ( -8.76180 4.11543 )
beta : -9.10796 ( -0.892038 7.32114 )
Epeak [keV] : 26.4649 ( -26.3649 9973.54 )
Norm@50keV : 4.304489E-03 ( -4.304489E-03 1.949901E+06) )
------------------------------------------------------------
Chi-Squared = 53.94757 using 59 PHA bins.
Reduced chi-squared = 0.9808650 for 55 degrees of freedom
Null hypothesis probability = 0.515
Photon flux (15-150 keV) in 33.04 sec: 0.157036 ( -0.064188 0.067171 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60978e-07 ( -1.17237e-07 1.12569e-07 ) ergs/cm2
Plot creation:
Tue Jan 1 19:04:13 EST 2008