batgrbproduct Analysis for Trigger=306379
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): Sun Mar 16 07:12:58 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306379/GCN5_download_cron
======================================================================
Trigger: 00306379 Segment: 000
BAT Trigger Time: 227288944 [s; MET]
Trigger Stop: 227289264 [s; MET]
UTC: 2008-03-15T15:49:01.354820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.67915274337 Dec: -17.0681295626344 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.02
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.02
Flight Position: [ source = BAT ]
RA: 274.67915274337 Dec: -17.0681295626344 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.707084695237 Dec: -17.0627764367996 [deg; J2000]
{ 18h 18m 49.7s , -17d 03' 46.0" }
+/- 3.52191511590048 [arcmin] (estimated 90% radius based on SNR)
+/- 2.25775075385301 [arcmin] (formal 1-sigma fit error)
SNR: 5.03507203004684
RA = 18h 18m 49.7s (274.707085 deg.)
Dec = -17d 3' 46" (-17.062776 deg.)
Angular difference between Flight and Ground position is 1.634005 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.537688 0.305109 0.095582 -0.021656
0.073294 0.064350 0.055082 0.050375 [error]
Peak 0.537688 0.305109 0.095582 -0.021656
0.073294 0.064350 0.055082 0.050375 [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 1.63e-07 1.37e-07 7.89e-08 6.74e-08 4.09e-07 4.47e-07 erg/cm2
Error 3.48e-08 3.30e-08 3.94e-08 6.37e-08 9.67e-08 1.31e-07 erg/cm2
Peak flux Power-law 2.95e-02 1.39e-02 4.01e-03 1.45e-03 4.83e-02 4.89e-02 ph/cm2/s
Error 6.45e-03 3.20e-03 1.94e-03 1.55e-03 8.83e-03 9.01e-03 ph/cm2/s
Fluence Cutoff-PL 1.62e-07 1.46e-07 6.14e-08 1.23e-08 3.79e-07 3.82e-07 erg/cm2
Error 3.62e-08 3.93e-08 5.41e-08 6.88e-08 1.04e-07 1.43e-07 erg/cm2
Peak flux Cutoff-PL 2.91e-02 1.49e-02 3.22e-03 3.31e-04 4.75e-02 4.75e-02 ph/cm2/s
Error 6.72e-03 3.89e-03 2.92e-03 1.41e-03 8.85e-03 6.76e-03 ph/cm2/s
Fluence Band 1.60e-07 1.46e-07 6.13e-08 1.22e-08 3.78e-07 3.80e-07 erg/cm2
Error 3.58e-08 3.88e-08 4.51e-08 6.63e-08 9.64e-08 1.09e-07 erg/cm2
Peak flux Band 2.95e-02 1.46e-02 3.11e-03 7.80e-04 4.78e-02 4.81e-02 ph/cm2/s
Error 6.53e-03 3.35e-03 2.81e-03 8.68e-04 8.87e-03 9.01e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.800 0.464 - - 2.02e-04 7.50e-05 60.314 57
CPL 1.589 0.000 10.6 12.5 1.35e-03 2.09e-01 59.803 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.800 0.464 - - 2.02e-04 7.50e-05 60.314 57
CPL 1.589 0.000 10.6 12.5 1.35e-03 2.08e-01 59.803 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.7071 -17.0628 0.0383 11.8 -151.6 0.8936 5.0 TRIG_00306379
------------------------------------------
Foreground time interval of the image:
0.000 183.080 (delta_t = 183.080 [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 183.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79950 ( -0.425058 0.503118 )
Norm@50keV : 2.022694E-04 ( -7.319433E-05 7.677829E-05) )
------------------------------------------------------------
Chi-Squared = 60.31429 using 59 PHA bins.
Reduced chi-squared = 1.058145 for 57 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 183.1 sec: 4.827547E-02 ( -0.00883181 0.00883646 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0873e-07 ( -9.30862e-08 1.00361e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.080 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.58881 ( )
Epeak [keV] : 10.5947 ( -5.00165 20.0437 )
Norm@50keV : 1.347980E-03 ( -9.770541E-04 0.416215 )
------------------------------------------------------------
Chi-Squared = 59.80338 using 59 PHA bins.
but latest trial 1.24035 gives Chi-Squared = 3.173828E-03
but latest trial 25.0452 gives Chi-Squared = 2.67203
Reduced chi-squared = 1.067917 for 56 degrees of freedom
Null hypothesis probability = 0.339
Photon flux (15-150 keV) in 183.1 sec: 4.747265E-02 ( -0.00883979 0.00886343 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79284e-07 ( -9.26211e-08 1.15988e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41327 ( -8.58673 2.17652 )
beta : -8.31032 ( -1.68968 18.3103 )
Epeak [keV] : 15.3156 ( -15.2156 10.2504 )
Norm@50keV : 1.499536E-03 ( -3.469485E-02 115.977 )
------------------------------------------------------------
Chi-Squared = 60.19827 using 59 PHA bins.
Reduced chi-squared = 1.094514 for 55 degrees of freedom
Null hypothesis probability = 0.293
Photon flux (15-150 keV) in 183.1 sec: 4.780394E-02 ( -0.00887364 0.00886262 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78116e-07 ( -1.00877e-07 9.18393e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 183.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79950 ( -0.425058 0.503118 )
Norm@50keV : 2.022694E-04 ( -7.319433E-05 7.677829E-05) )
------------------------------------------------------------
Chi-Squared = 60.31429 using 59 PHA bins.
Reduced chi-squared = 1.058145 for 57 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 183.1 sec: 4.827547E-02 ( -0.00883181 0.00883646 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0873e-07 ( -9.30862e-08 1.00361e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.080 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58881 ( )
Epeak [keV] : 10.5947 ( -6.26130 18.8306 )
Norm@50keV : 1.347980E-03 ( -9.782272E-04 0.415052 )
------------------------------------------------------------
Chi-Squared = 59.80338 using 59 PHA bins.
but latest trial 25.1257 gives Chi-Squared = 2.75698
Reduced chi-squared = 1.067917 for 56 degrees of freedom
Null hypothesis probability = 0.339
Photon flux (15-150 keV) in 183.1 sec: 4.747265E-02 ( -0.00883979 0.00886343 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79284e-07 ( -9.26211e-08 1.15988e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41327 ( -8.58673 2.17652 )
beta : -8.31032 ( -1.68968 18.3103 )
Epeak [keV] : 15.3156 ( -15.2156 10.2504 )
Norm@50keV : 1.499536E-03 ( -3.469485E-02 115.977 )
------------------------------------------------------------
Chi-Squared = 60.19827 using 59 PHA bins.
Reduced chi-squared = 1.094514 for 55 degrees of freedom
Null hypothesis probability = 0.293
Photon flux (15-150 keV) in 183.1 sec: 4.780394E-02 ( -0.00887364 0.00886262 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78116e-07 ( -1.00877e-07 9.18393e-08 ) ergs/cm2
Plot creation:
Sun Mar 16 07:29:21 EDT 2008