batgrbproduct Analysis for Trigger=271019
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): Thu Dec 13 15:32:49 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger271019/GCN5_download_cron
======================================================================
Trigger: 00271019 Segment: 000
BAT Trigger Time: 195895737.92 [s; MET]
Trigger Stop: 195895738.432 [s; MET]
UTC: 2007-03-18T07:28:56.088640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.5402261665742 Dec: -42.961988565526 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.03
Image Trigger?: NO
Rate S/N Ratio: 17.9443584449264 [ if not an image trigger ]
Image S/N Ratio: 10.03
Flight Position: [ source = BAT ]
RA: 48.5402261665742 Dec: -42.961988565526 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.4852330819327 Dec: -42.9447556847306 [deg; J2000]
{ 03h 13m 56.5s , -42d 56' 41.1" }
+/- 0.778505671218729 [arcmin] (estimated 90% radius based on SNR)
+/- 0.240612646042198 [arcmin] (formal 1-sigma fit error)
SNR: 43.4969387826544
RA = 3h 13m 56.5s (48.485233 deg.)
Dec = -42d 56' 41" (-42.944756 deg.)
Angular difference between Flight and Ground position is 2.627032 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 108 +/- 28
Measured from: 0.0800000131130219
to: 108.080000013113 [s; relative to TRIGTIME]
T50: 32 +/- 4
Measured from: 4.08000001311302
to: 36.080000013113 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.08000001311302
to: 2.08000001311302 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.919999986886978
to: 147.080000013113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.098175 1.508735 1.178173 0.304580
0.057296 0.058722 0.053044 0.047819 [error]
Peak 0.050359 0.076847 0.060454 0.014393
0.005775 0.006384 0.005920 0.004746 [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 3.25e-07 6.26e-07 9.35e-07 3.01e-06 2.63e-06 4.90e-06 erg/cm2
Error 2.93e-08 3.22e-08 5.41e-08 4.03e-07 1.31e-07 4.34e-07 erg/cm2
Peak flux Power-law 4.85e-01 5.35e-01 4.22e-01 5.48e-01 1.65e+00 1.99e+00 ph/cm2/s
Error 7.92e-02 5.40e-02 4.78e-02 1.28e-01 1.53e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 3.18e-07 6.30e-07 9.43e-07 2.64e-06 2.62e-06 4.36e-06 erg/cm2
Error 3.53e-08 2.67e-08 4.64e-08 8.57e-07 1.41e-07 8.75e-07 erg/cm2
Peak flux Cutoff-PL 4.30e-01 5.65e-01 4.49e-01 3.02e-01 1.61e+00 1.75e+00 ph/cm2/s
Error 9.55e-02 6.37e-02 5.72e-02 1.96e-01 1.57e-01 2.49e-01 ph/cm2/s
Fluence Band 3.18e-07 6.29e-07 9.31e-07 2.97e-06 2.63e-06 4.82e-06 erg/cm2
Error 3.03e-08 3.69e-08 3.60e-08 7.69e-07 1.36e-07 4.65e-07 erg/cm2
Peak flux Band 4.30e-01 5.64e-01 4.49e-01 3.02e-01 1.61e+00 1.75e+00 ph/cm2/s
Error 9.56e-02 6.38e-02 5.72e-02 1.97e-01 1.57e-01 2.50e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.421 0.088 - - 1.85e-03 8.39e-05 39.080 57
CPL 1.262 0.261 249.7 0.0 2.19e-03 0.00e+00 38.994 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.344 0.158 - - 1.37e-02 1.27e-03 54.940 57
CPL 0.744 0.657 109.9 1145.1 2.69e-02 2.20e-02 52.078 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: 73.664000 sec.
T50 in the 50-300 keV band: 23.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 148.000 -0.920 147.080
T90 108.000 0.080 108.080
T50 32.000 4.080 36.080
Peak 1.000 1.080 2.080
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.4852 -42.9448 0.0044 21.6 -57.3 1.6212 43.5 TRIG_00271019
------------------------------------------
Foreground time interval of the image:
-0.920 8.481 (delta_t = 9.401 [sec])
Background time interval of the image:
-113.719 -0.920 (delta_t = 112.799 [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 -0.920 sec. to 147.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42091 ( -8.767593E-02 8.758378E-02) )
Norm@50keV : 1.849647E-03 ( -8.389156E-05 8.383754E-05) )
------------------------------------------------------------
Chi-Squared = 39.07956 using 59 PHA bins.
Reduced chi-squared = 0.6856063 for 57 degrees of freedom
Null hypothesis probability = 0.966
Photon flux (15-150 keV) in 148.0 sec: 0.226344 ( -0.010895 0.01094 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63394e-06 ( -1.30595e-07 1.3175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 147.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26244 ( -0.279490 0.242220 )
Epeak [keV] : 249.669 ( )
Norm@50keV : 2.188858E-03 ( )
------------------------------------------------------------
Chi-Squared = 38.99354 using 59 PHA bins.
Reduced chi-squared = 0.6963132 for 56 degrees of freedom
Null hypothesis probability = 0.959
Photon flux (15-150 keV) in 148.0 sec: 0.225070 ( -0.011473 0.011675 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61901e-06 ( -1.42169e-07 1.40289e-07 ) ergs/cm2
Band function
Time interval is from -0.920 sec. to 147.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01118 ( -10.1488 1.89162 )
beta : -1.43231 ( -0.104635 0.102655 )
Epeak [keV] : 66.3235 ( -34.1963 905.001 )
Norm@50keV : 3.597056E-03 ( -24.4611 136.155 )
------------------------------------------------------------
Chi-Squared = 38.79401 using 59 PHA bins.
Reduced chi-squared = 0.7053457 for 55 degrees of freedom
Null hypothesis probability = 0.952
Photon flux (15-150 keV) in 148.0 sec: 0.225072 ( -0.011714 0.011672 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62839e-06 ( -1.42509e-07 1.28834e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.080 sec. to 2.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34431 ( -0.157358 0.158052 )
Norm@50keV : 1.367878E-02 ( -1.270220E-03 1.267384E-03) )
------------------------------------------------------------
Chi-Squared = 54.94037 using 59 PHA bins.
Reduced chi-squared = 0.9638662 for 57 degrees of freedom
Null hypothesis probability = 0.553
Photon flux (15-150 keV) in 1.000 sec: 1.64599 ( -0.15337 0.15352 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33779e-07 ( -1.39e-08 1.402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.080 sec. to 2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.744129 ( -0.708599 0.606364 )
Epeak [keV] : 109.922 ( -34.7777 2255.41 )
Norm@50keV : 2.686468E-02 ( -1.296205E-02 3.112266E-02) )
------------------------------------------------------------
Chi-Squared = 52.07837 using 59 PHA bins.
Reduced chi-squared = 0.9299709 for 56 degrees of freedom
Null hypothesis probability = 0.624
Photon flux (15-150 keV) in 1.000 sec: 1.61278 ( -0.15762 0.15706 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29581e-07 ( -1.4858e-08 1.4833e-08 ) ergs/cm2
Band function
Time interval is from 1.080 sec. to 2.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.744632 ( -0.606264 0.709146 )
beta : -8.57539 ( -1.42461 4.87098 )
Epeak [keV] : 109.951 ( -34.8255 2271.59 )
Norm@50keV : 2.684854E-02 ( -1.294842E-02 3.115252E-02) )
------------------------------------------------------------
Chi-Squared = 52.07849 using 59 PHA bins.
Reduced chi-squared = 0.9468816 for 55 degrees of freedom
Null hypothesis probability = 0.587
Photon flux (15-150 keV) in 1.000 sec: 1.61284 ( -0.15763 0.15726 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29518e-07 ( -1.4869e-08 1.4816e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 15:58:22 EST 2007