batgrbproduct Analysis for Trigger=234905
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 09:06:26 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger234905/GCN5_download_cron
======================================================================
Trigger: 00234905 Segment: 000
BAT Trigger Time: 183137949.184 [s; MET]
Trigger Stop: 183137950.208 [s; MET]
UTC: 2006-10-21T15:39:07.663280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 145.134075795178 Dec: -21.9284421197878 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.12
Image Trigger?: NO
Rate S/N Ratio: 19.313207915828 [ if not an image trigger ]
Image S/N Ratio: 9.12
Flight Position: [ source = BAT ]
RA: 145.134075795178 Dec: -21.9284421197878 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 145.149736735107 Dec: -21.9534913337211 [deg; J2000]
{ 09h 40m 35.9s , -21d 57' 12.6" }
+/- 0.635473203812844 [arcmin] (estimated 90% radius based on SNR)
+/- 0.180355697479235 [arcmin] (formal 1-sigma fit error)
SNR: 58.1310321150358
RA = 9h 40m 35.9s (145.149737 deg.)
Dec = -21d 57' 13" (-21.953491 deg.)
Angular difference between Flight and Ground position is 1.737397 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 46.2120000123978 +/- 5.39883246764966
Measured from: 1.56800001859665
to: 47.7800000309944 [s; relative to TRIGTIME]
T50: 10.1399999856949 +/- 1.15345047653369
Measured from: 3.13200002908707
to: 13.272000014782 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.4360000193119
to: 3.4360000193119 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00799998641014099
to: 59.9040000140667 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.076547 1.601363 1.359450 0.355212
0.042934 0.044224 0.039761 0.033239 [error]
Peak 0.167804 0.273257 0.246876 0.083151
0.008650 0.010089 0.010110 0.007970 [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 3.23e-07 6.65e-07 1.07e-06 3.86e-06 2.97e-06 5.86e-06 erg/cm2
Error 2.31e-08 2.70e-08 4.06e-08 3.56e-07 1.01e-07 3.80e-07 erg/cm2
Peak flux Power-law 1.56e+00 1.92e+00 1.71e+00 2.64e+00 6.11e+00 7.83e+00 ph/cm2/s
Error 1.42e-01 1.01e-01 8.30e-02 2.92e-01 2.69e-01 3.51e-01 ph/cm2/s
Fluence Cutoff-PL 3.22e-07 6.65e-07 1.07e-06 3.84e-06 2.97e-06 5.90e-06 erg/cm2
Error 2.31e-08 2.70e-08 4.07e-08 3.53e-07 1.02e-07 3.68e-07 erg/cm2
Peak flux Cutoff-PL 1.56e+00 1.92e+00 1.71e+00 2.63e+00 6.10e+00 7.82e+00 ph/cm2/s
Error 1.42e-01 1.01e-01 8.31e-02 2.90e-01 2.69e-01 3.50e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.56e+00 1.92e+00 1.71e+00 2.64e+00 6.11e+00 7.82e+00 ph/cm2/s
Error 6.55e-02 9.00e-02 7.88e-02 1.11e-01 2.59e-01 3.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.311 0.064 - - 5.03e-03 1.64e-04 43.622 57
CPL 1.263 0.143 863.5 0.0 5.28e-03 1.64e-04 43.967 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.164 0.081 - - 5.23e-02 2.20e-03 69.384 57
CPL 1.159 0.082 9998.8 5000.0 5.25e-02 2.21e-03 69.471 56
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: 32.000000 sec.
T50 in the 50-300 keV band: 6.976000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 59.912 -0.008 59.904
T90 46.212 1.568 47.780
T50 10.140 3.132 13.272
Peak 1.000 2.436 3.436
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
145.1497 -21.9535 0.0033 25.3 -62.5 2.9582 58.1 TRIG_00234905
------------------------------------------
Foreground time interval of the image:
-0.008 8.517 (delta_t = 8.525 [sec])
Background time interval of the image:
-239.184 -0.008 (delta_t = 239.176 [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 -0.008 sec. to 59.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31135 ( -6.425512E-02 6.395054E-02) )
Norm@50keV : 5.027984E-03 ( -1.637661E-04 1.636245E-04) )
------------------------------------------------------------
Chi-Squared = 43.62236 using 59 PHA bins.
Reduced chi-squared = 0.7653045 for 57 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 59.91 sec: 0.601126 ( -0.021693 0.021769 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96818e-06 ( -1.01062e-07 1.01859e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 59.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26257 ( -0.173570 0.113024 )
Epeak [keV] : 863.474 ( )
Norm@50keV : 5.275170E-03 ( -1.616846E-04 1.666057E-04) )
------------------------------------------------------------
Chi-Squared = 43.96677 using 59 PHA bins.
Reduced chi-squared = 0.7851210 for 56 degrees of freedom
Null hypothesis probability = 0.878
Photon flux (15-150 keV) in 59.91 sec: 0.600830 ( -0.021679 0.0218 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96909e-06 ( -1.0132e-07 1.01679e-07 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 59.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.895409 ( -9.10459 3.90271 )
beta : -1.32117 ( -8.67883 7.111192E-02) )
Epeak [keV] : 76.1512 ( -76.0512 9923.85 )
Norm@50keV : 9.688409E-03 ( -4.817537E-03 439.177 )
------------------------------------------------------------
Chi-Squared = 43.43363 using 59 PHA bins.
Reduced chi-squared = 0.7897024 for 55 degrees of freedom
Null hypothesis probability = 0.870
Photon flux (15-150 keV) in 59.91 sec: 0.600734 ( -0.019398 0.019389 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16368 ( -8.163118E-02 8.110011E-02) )
Norm@50keV : 5.227567E-02 ( -2.200291E-03 2.199013E-03) )
------------------------------------------------------------
Chi-Squared = 69.38395 using 59 PHA bins.
Reduced chi-squared = 1.217262 for 57 degrees of freedom
Null hypothesis probability = 0.126
Photon flux (15-150 keV) in 1.000 sec: 6.10658 ( -0.26859 0.26939 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35947e-07 ( -2.5011e-08 2.5129e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15909 ( -8.221424E-02 8.164811E-02) )
Epeak [keV] : 9998.82 ( -9998.81 1.17969 )
Norm@50keV : 5.253759E-02 ( -2.209242E-03 2.208292E-03) )
------------------------------------------------------------
Chi-Squared = 69.47132 using 59 PHA bins.
Reduced chi-squared = 1.240559 for 56 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 1.000 sec: 6.10434 ( -0.26848 0.26928 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36053e-07 ( -2.5023e-08 2.5148e-08 ) ergs/cm2
Band function
Time interval is from 2.436 sec. to 3.436 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.800974 ( -9.19903 3.88923 )
beta : -1.17390 ( -0.111573 9.006560E-02) )
Epeak [keV] : 94.1748 ( -94.0748 772.146 )
Norm@50keV : 9.297271E-02 ( -4.281994E-02 1948.10 )
------------------------------------------------------------
Chi-Squared = 69.27108 using 59 PHA bins.
Reduced chi-squared = 1.259474 for 55 degrees of freedom
Null hypothesis probability = 9.334E-02
Photon flux (15-150 keV) in 1.000 sec: 6.10794 ( -0.26174 0.25618 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35674e-07 ( -2.5035e-08 2.5105e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 09:22:50 EST 2008