batgrbproduct Analysis for Trigger=178754
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): Mon Dec 31 10:07:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger178754/GCN5_download_cron
======================================================================
Trigger: 00178754 Segment: 000
BAT Trigger Time: 159815856 [s; MET]
Trigger Stop: 159815920 [s; MET]
UTC: 2006-01-24T17:17:37.000000 [includes UTCF correction]
WARNING: UTCFINIT is zero. This is suspicious.
Where From?: TDRSS position message
BAT
RA: 333.229415290824 Dec: 17.3228889250343 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33273
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33273
Flight Position: [ source = BAT ]
RA: 333.229415290824 Dec: 17.3228889250343 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 333.137303512234 Dec: 17.2725361002295 [deg; J2000]
{ 22h 12m 33.0s , +17d 16' 21.1" }
+/- 5.57167983551785 [arcmin] (estimated 90% radius based on SNR)
+/- 3.68885366202397 [arcmin] (formal 1-sigma fit error)
SNR: 2.6147120969904
RA = 22h 12m 33.0s (333.137304 deg.)
Dec = 17d 16' 21" (17.272536 deg.)
Angular difference between Flight and Ground position is 6.080422 arcmin
Partial Coding Fraction: 0.671875 [ 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 0.075691 0.151803 0.019384 -0.038241
0.038343 0.041267 0.042504 0.045453 [error]
Peak 0.075691 0.151803 0.019384 -0.038241
0.038343 0.041267 0.042504 0.045453 [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 2.83e-08 4.32e-08 4.95e-08 1.08e-07 1.53e-07 2.33e-07 erg/cm2
Error 1.65e-08 2.00e-08 3.44e-08 1.69e-07 8.50e-08 1.99e-07 erg/cm2
Peak flux Power-law 2.77e-02 2.33e-02 1.34e-02 1.14e-02 6.94e-02 7.56e-02 ph/cm2/s
Error 1.64e-02 1.07e-02 9.02e-03 1.63e-02 3.18e-02 3.62e-02 ph/cm2/s
Fluence Cutoff-PL 2.78e-08 6.61e-08 2.12e-08 2.98e-10 1.15e-07 1.15e-07 erg/cm2
Error 1.19e-08 2.75e-08 3.08e-08 1.09e-08 5.07e-08 5.10e-08 erg/cm2
Peak flux Cutoff-PL 2.66e-02 3.59e-02 6.47e-03 4.84e-05 6.89e-02 6.90e-02 ph/cm2/s
Error 1.55e-02 1.45e-02 8.79e-03 1.59e-03 2.74e-02 2.74e-02 ph/cm2/s
Fluence Band 2.44e-08 6.07e-08 4.01e-08 1.39e-08 1.35e-07 1.47e-07 erg/cm2
Error 1.81e-08 2.58e-08 3.79e-08 9.20e-08 5.71e-08 0.00e+00 erg/cm2
Peak flux Band 2.74e-02 3.16e-02 1.03e-02 5.97e-04 6.99e-02 6.99e-02 ph/cm2/s
Error 1.37e-02 1.32e-02 1.11e-02 9.00e-03 2.90e-02 2.90e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.805 0.773 - - 5.03e-04 3.88e-04 55.711 57
CPL -2.484 0.000 35.8 10.3 3.17e-01 1.18e+00 51.421 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.805 0.773 - - 5.03e-04 3.88e-04 55.711 57
CPL -2.484 0.000 35.8 10.3 3.17e-01 1.18e+00 51.421 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
333.1373 +17.2725 0.0737 35.0 -22.2 0.2189 2.6 TRIG_00178754
------------------------------------------
Foreground time interval of the image:
0.000 33.085 (delta_t = 33.085 [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 33.085 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80466 ( -0.716809 0.830178 )
Norm@50keV : 5.027902E-04 ( -5.027902E-04 2.726533E-04) )
------------------------------------------------------------
Chi-Squared = 55.71053 using 59 PHA bins.
Reduced chi-squared = 0.9773777 for 57 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 33.08 sec: 6.940812E-02 ( -0.0318299 0.0318459 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53078e-07 ( -7.96494e-08 9.03951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.085 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.48384 ( )
Epeak [keV] : 35.8268 ( -8.61307 11.9223 )
Norm@50keV : 0.317179 ( -0.549155 1.80547 )
------------------------------------------------------------
Chi-Squared = 51.42126 using 59 PHA bins.
but latest trial 47.0238 gives Chi-Squared = 2.22479
but latest trial 0.140778 gives Chi-Squared = 0.544743
Reduced chi-squared = 0.9182367 for 56 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 33.08 sec: 6.891642E-02 ( -0.0273588 0.027371 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1546e-07 ( -4.81622e-08 5.32522e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.085 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.275330E-02 ( -5.30621 0.134700 )
beta : -8.98159 ( -3.71906 16.2809 )
Epeak [keV] : 42.6934 ( -13.9452 7.00344 )
Norm@50keV : 6.957061E-03 ( -4.27562 15.4601 )
------------------------------------------------------------
Chi-Squared = 53.34765 using 59 PHA bins.
Reduced chi-squared = 0.9699573 for 55 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 33.08 sec: 6.988662E-02 ( -0.0289738 0.0289738 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34975e-07 ( -6.07521e-08 5.34275e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.085 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80466 ( -0.716809 0.830178 )
Norm@50keV : 5.027902E-04 ( -5.027902E-04 2.726533E-04) )
------------------------------------------------------------
Chi-Squared = 55.71053 using 59 PHA bins.
Reduced chi-squared = 0.9773777 for 57 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 33.08 sec: 6.940812E-02 ( -0.0318299 0.0318459 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53078e-07 ( -7.96494e-08 9.03951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.085 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.48384 ( )
Epeak [keV] : 35.8268 ( -8.61307 11.9223 )
Norm@50keV : 0.317179 ( -0.549155 1.80547 )
------------------------------------------------------------
Chi-Squared = 51.42126 using 59 PHA bins.
but latest trial 47.0238 gives Chi-Squared = 2.22479
but latest trial 0.140778 gives Chi-Squared = 0.544743
Reduced chi-squared = 0.9182367 for 56 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 33.08 sec: 6.891642E-02 ( -0.0273588 0.027371 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1546e-07 ( -4.81622e-08 5.32522e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.085 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.275330E-02 ( -5.27071 3.012085E-02) )
beta : -8.98159 ( -3.29057 16.7084 )
Epeak [keV] : 42.6934 ( -13.0410 7.20733 )
Norm@50keV : 6.957061E-03 ( -13.1050 53.1098 )
------------------------------------------------------------
Chi-Squared = 53.34765 using 59 PHA bins.
Reduced chi-squared = 0.9699573 for 55 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 33.08 sec: 6.988662E-02 ( -0.0289738 0.0289738 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34975e-07 ( -6.07521e-08 5.34275e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 10:12:07 EST 2007