batgrbproduct Analysis for Trigger=282445
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): Fri Dec 14 02:26:14 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger282445/GCN5_download_cron
======================================================================
Trigger: 00282445 Segment: 000
BAT Trigger Time: 203704176 [s; MET]
Trigger Stop: 203704240 [s; MET]
UTC: 2007-06-16T16:29:33.974040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.1553533187329 Dec: 56.9481781851878 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 32.1553533187329 Dec: 56.9481781851878 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.0966670768743 Dec: 56.944639970781 [deg; J2000]
{ 02h 08m 23.2s , +56d 56' 40.7" }
+/- 2.70827071489915 [arcmin] (estimated 90% radius based on SNR)
+/- 1.5890672462162 [arcmin] (formal 1-sigma fit error)
SNR: 7.3280233789102
RA = 2h 8m 23.2s (32.096667 deg.)
Dec = 56d 56' 41" (56.944640 deg.)
Angular difference between Flight and Ground position is 1.932228 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 402.356000006199 +/- 16.337113588242
Measured from: 92.3759999871254
to: 494.731999993324 [s; relative to TRIGTIME]
T50: 199.09999999404 +/- 5.64298962099925
Measured from: 161.108000010252
to: 360.208000004292 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 139.743999987841
to: 140.743999987841 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.64399999380112
to: 602.224000006914 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.846492 12.363082 8.669295 1.797473
0.126841 0.129564 0.118635 0.108522 [error]
Peak 0.059680 0.091304 0.078001 0.026147
0.005548 0.005992 0.005816 0.004919 [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 3.17e-06 5.33e-06 6.82e-06 1.75e-05 2.02e-05 3.28e-05 erg/cm2
Error 1.32e-07 1.23e-07 1.45e-07 9.19e-07 3.62e-07 9.48e-07 erg/cm2
Peak flux Power-law 5.68e-01 6.53e-01 5.40e-01 7.49e-01 2.03e+00 2.51e+00 ph/cm2/s
Error 8.21e-02 5.55e-02 4.75e-02 1.45e-01 1.52e-01 1.92e-01 ph/cm2/s
Fluence Cutoff-PL 2.92e-06 5.36e-06 6.98e-06 1.29e-05 1.98e-05 2.84e-05 erg/cm2
Error 1.90e-07 1.27e-07 1.72e-07 2.30e-06 3.18e-07 2.37e-06 erg/cm2
Peak flux Cutoff-PL 5.67e-01 6.54e-01 5.40e-01 7.45e-01 2.03e+00 2.51e+00 ph/cm2/s
Error 8.21e-02 5.55e-02 4.75e-02 1.44e-01 1.52e-01 1.91e-01 ph/cm2/s
Fluence Band 2.90e-06 5.34e-06 6.96e-06 1.29e-05 1.98e-05 2.82e-05 erg/cm2
Error 1.89e-07 1.26e-07 1.72e-07 2.30e-06 4.24e-07 2.36e-06 erg/cm2
Peak flux Band 5.39e-01 6.45e-01 5.44e-01 7.65e-01 2.03e+00 2.54e+00 ph/cm2/s
Error 1.07e-01 4.75e-02 4.17e-02 9.72e-02 1.48e-01 1.84e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.645 0.038 - - 3.59e-03 6.46e-05 58.818 57
CPL 1.378 0.165 136.1 69.6 4.66e-03 7.36e-04 50.607 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.275 0.136 - - 1.71e-02 1.24e-03 46.175 57
CPL 1.271 0.137 9992.9 5000.0 1.72e-02 1.25e-03 46.191 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: 343.936000 sec.
T50 in the 50-300 keV band: 171.968000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 604.868 -2.644 602.224
T90 402.356 92.376 494.732
T50 199.100 161.108 360.208
Peak 1.000 139.744 140.744
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.0967 +56.9446 0.0262 26.6 -64.5 1.0443 7.3 TRIG_00282445
------------------------------------------
Foreground time interval of the image:
-2.644 70.501 (delta_t = 73.145 [sec])
Background time interval of the image:
-72.499 -2.644 (delta_t = 69.855 [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
Multiple GTIs in the spectrum
tstart tstop
-2.644000 496.990000
498.000000 602.224000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64525 ( -3.770030E-02 3.771734E-02) )
Norm@50keV : 3.588670E-03 ( -6.463961E-05 6.461353E-05) )
------------------------------------------------------------
Chi-Squared = 58.81788 using 59 PHA bins.
Reduced chi-squared = 1.031893 for 57 degrees of freedom
Null hypothesis probability = 0.409
Photon flux (15-150 keV) in 603.9 sec: 0.467862 ( -0.010738 0.010814 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01654e-05 ( -3.62098e-07 3.62159e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-2.644000 496.990000
498.000000 602.224000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37784 ( -0.169784 0.159442 )
Epeak [keV] : 136.065 ( -30.8867 108.394 )
Norm@50keV : 4.655791E-03 ( -6.553777E-04 8.161650E-04) )
------------------------------------------------------------
Chi-Squared = 50.60677 using 59 PHA bins.
Reduced chi-squared = 0.9036923 for 56 degrees of freedom
Null hypothesis probability = 0.678
Photon flux (15-150 keV) in 603.9 sec: 0.453965 ( -0.013119 0.013276 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97988e-05 ( -2.13599e-07 4.2273e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-2.644000 496.990000
498.000000 602.224000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35822 ( -0.180098 0.151278 )
beta : -9.26197 ( -0.738029 7.52519 )
Epeak [keV] : 130.587 ( -25.5697 115.412 )
Norm@50keV : 4.743933E-03 ( -7.479773E-04 7.321262E-04) )
------------------------------------------------------------
Chi-Squared = 50.64066 using 59 PHA bins.
Reduced chi-squared = 0.9207392 for 55 degrees of freedom
Null hypothesis probability = 0.642
Photon flux (15-150 keV) in 603.9 sec: 0.453974 ( -0.013147 0.013302 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97777e-05 ( -4.24421e-07 4.24119e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27513 ( -0.136240 0.135771 )
Norm@50keV : 1.711486E-02 ( -1.243113E-03 1.242371E-03) )
------------------------------------------------------------
Chi-Squared = 46.17455 using 59 PHA bins.
Reduced chi-squared = 0.8100798 for 57 degrees of freedom
Null hypothesis probability = 0.847
Photon flux (15-150 keV) in 1.000 sec: 2.03279 ( -0.1522 0.15263 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7012e-07 ( -1.3882e-08 1.4069e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27123 ( -0.137177 0.136649 )
Epeak [keV] : 9992.92 ( -9992.91 7.08008 )
Norm@50keV : 1.718975E-02 ( -1.249738E-03 1.248661E-03) )
------------------------------------------------------------
Chi-Squared = 46.19116 using 59 PHA bins.
Reduced chi-squared = 0.8248422 for 56 degrees of freedom
Null hypothesis probability = 0.822
Photon flux (15-150 keV) in 1.000 sec: 2.03211 ( -0.15215 0.15258 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70206e-07 ( -1.3938e-08 1.403e-08 ) ergs/cm2
Band function
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01921 ( -8.98079 4.01569 )
beta : -1.27481 ( -8.72519 0.136063 )
Epeak [keV] : 42.2472 ( -42.1472 3331.98 )
Norm@50keV : 3.256700E-02 ( -1.669285E-02 4.33312 )
------------------------------------------------------------
Chi-Squared = 46.17505 using 59 PHA bins.
Reduced chi-squared = 0.8395463 for 55 degrees of freedom
Null hypothesis probability = 0.796
Photon flux (15-150 keV) in 1.000 sec: 2.02887 ( -0.14705 0.149 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70074e-07 ( -1.3939e-08 1.4017e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 02:47:37 EST 2007