batgrbproduct Analysis for Trigger=223918
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): Wed Jan 2 00:09:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger223918/GCN5_download_cron
======================================================================
Trigger: 00223918 Segment: 000
BAT Trigger Time: 176957996.864 [s; MET]
Trigger Stop: 176958005.056 [s; MET]
UTC: 2006-08-11T02:59:55.491240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 192.420468400008 Dec: -59.0925149093837 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.97
Image Trigger?: NO
Rate S/N Ratio: 15.7162336455017 [ if not an image trigger ]
Image S/N Ratio: 9.97
Flight Position: [ source = BAT ]
RA: 192.420468400008 Dec: -59.0925149093837 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 192.427317877467 Dec: -59.1000166615713 [deg; J2000]
{ 12h 49m 42.6s , -59d 06' 00.1" }
+/- 1.71649872881651 [arcmin] (estimated 90% radius based on SNR)
+/- 0.856485678341444 [arcmin] (formal 1-sigma fit error)
SNR: 14.0576718008655
RA = 12h 49m 42.6s (192.427318 deg.)
Dec = -59d 6' 0" (-59.100017 deg.)
Angular difference between Flight and Ground position is 0.497138 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -31.863999992609
to: 16.136000007391 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.863999992609
to: 0.136000007390976 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -8.36399999260902
to: -7.36399999260902 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.863999992609
to: 16.136000007391 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.233034 0.152616 0.085040 -0.027278
0.054192 0.051138 0.044918 0.040397 [error]
Peak 0.520849 0.053057 0.044597 0.044551
0.031496 0.029614 0.025995 0.023231 [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 4.74e-07 9.80e-08 1.01e-08 1.14e-09 5.83e-07 5.84e-07 erg/cm2
Error 6.02e-08 2.74e-08 6.65e-09 1.34e-09 7.13e-08 7.14e-08 erg/cm2
Peak flux Power-law 4.31e-01 4.71e-02 2.15e-03 1.02e-04 4.80e-01 4.80e-01 ph/cm2/s
Error 6.40e-02 1.73e-02 2.33e-03 1.80e-04 6.95e-02 6.95e-02 ph/cm2/s
Fluence Cutoff-PL 4.93e-07 6.79e-08 2.71e-10 3.04e-15 5.61e-07 5.61e-07 erg/cm2
Error 6.52e-08 3.57e-08 6.63e-09 8.87e-10 6.93e-08 6.92e-08 erg/cm2
Peak flux Cutoff-PL 4.31e-01 4.70e-02 2.14e-03 1.01e-04 4.80e-01 4.80e-01 ph/cm2/s
Error 6.39e-02 1.73e-02 2.33e-03 1.78e-04 6.94e-02 6.94e-02 ph/cm2/s
Fluence Band 4.64e-07 1.01e-07 1.02e-08 1.10e-09 5.87e-07 4.38e-07 erg/cm2
Error 5.58e-08 1.99e-08 7.41e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.47e-01 3.47e-02 1.66e-04 5.40e-07 4.81e-01 4.81e-01 ph/cm2/s
Error 4.99e-02 8.77e-03 8.39e-04 5.06e-05 6.92e-02 6.92e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.355 0.544 - - 1.79e-04 1.02e-04 39.780 57
CPL 1.624 0.000 2.1 6.5 2.05e-01 0.00e+00 37.661 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.456 0.702 - - 2.00e-04 1.91e-04 52.864 57
CPL 1.671 0.000 1.7 6.4 3.08e-01 0.00e+00 51.280 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 48.000 -31.864 16.136
T90 48.000 -31.864 16.136
T50 16.000 -15.864 0.136
Peak 1.000 -8.364 -7.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
192.4273 -59.1000 0.0137 43.0 -9.1 1.4733 14.1 TRIG_00223918
------------------------------------------
Foreground time interval of the image:
-31.864 16.136 (delta_t = 48.000 [sec])
Background time interval of the image:
-239.864 -31.864 (delta_t = 208.000 [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 -31.864 sec. to 16.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.35513 ( -0.599763 0.487250 )
Norm@50keV : 1.787658E-04 ( -6.963711E-05 1.339914E-04) )
------------------------------------------------------------
Chi-Squared = 39.78046 using 59 PHA bins.
Reduced chi-squared = 0.6979027 for 57 degrees of freedom
Null hypothesis probability = 0.960
Photon flux (15-150 keV) in 48.00 sec: 0.387803 ( -0.047026 0.047043 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83349e-07 ( -7.11936e-08 7.14816e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.864 sec. to 16.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62444 ( )
Epeak [keV] : 2.12648 ( -4.85850 8.15914 )
Norm@50keV : 0.205311 ( )
------------------------------------------------------------
Chi-Squared = 37.66059 using 59 PHA bins.
Reduced chi-squared = 0.6725105 for 56 degrees of freedom
Null hypothesis probability = 0.972
Photon flux (15-150 keV) in 48.00 sec: 0.387421 ( -0.046971 0.046988 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61355e-07 ( -6.8976e-08 6.95424e-08 ) ergs/cm2
Band function
Time interval is from -31.864 sec. to 16.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.01588 ( -0.984117 4.95262 )
beta : -5.28042 ( -0.557357 0.520354 )
Epeak [keV] : 302.035 ( -301.935 9697.97 )
Norm@50keV : 2.607776E-02 ( -1.115897E-02 1.624830E-02) )
------------------------------------------------------------
Chi-Squared = 39.72831 using 59 PHA bins.
Reduced chi-squared = 0.7223329 for 55 degrees of freedom
Null hypothesis probability = 0.940
Photon flux (15-150 keV) in 48.00 sec: 0.387068 ( -0.046784 0.048134 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86536e-07 ( -7.80624e-08 7.01904e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -15.864 sec. to 0.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.45585 ( -0.669121 0.735375 )
Norm@50keV : 2.002871E-04 ( -2.002871E-04 1.826845E-04) )
------------------------------------------------------------
Chi-Squared = 52.86404 using 59 PHA bins.
Reduced chi-squared = 0.9274394 for 57 degrees of freedom
Null hypothesis probability = 0.631
Photon flux (15-150 keV) in 16.00 sec: 0.480265 ( -0.06951 0.069513 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38021e-07 ( -3.63152e-08 3.67584e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.864 sec. to 0.136 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67073 ( )
Epeak [keV] : 1.74274 ( -5.48947 7.25469 )
Norm@50keV : 0.308440 ( )
------------------------------------------------------------
Chi-Squared = 51.28027 using 59 PHA bins.
but latest trial 12.7550 gives Chi-Squared = 2.72298
Reduced chi-squared = 0.9157191 for 56 degrees of freedom
Null hypothesis probability = 0.654
Photon flux (15-150 keV) in 16.00 sec: 0.479766 ( -0.069445 0.069446 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30339e-07 ( -3.36064e-08 3.41104e-08 ) ergs/cm2
Band function
Time interval is from -15.864 sec. to 0.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25456 ( -8.464813E-03 14.9915 )
beta : -3.73290 ( -0.736036 0.669593 )
Epeak [keV] : 1.50099 ( -1.40099 9998.50 )
Norm@50keV : 3.12139 ( -1.467306E-02 2.482322E-02) )
------------------------------------------------------------
Chi-Squared = 72.39854 using 59 PHA bins.
Reduced chi-squared = 1.316337 for 55 degrees of freedom
Null hypothesis probability = 5.791E-02
Photon flux (15-150 keV) in 16.00 sec: 0.481453 ( -0.069169 0.069193 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35406e-07 ( -3.3952e-08 3.38704e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 00:32:37 EST 2008