batgrbproduct Analysis for Trigger=374598
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 v2.45
Process Start Time (local time): Tue Nov 3 02:54:42 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374598/GCN5_download_cron
======================================================================
Trigger: 00374598 Segment: 000
BAT Trigger Time: 278865283.584 [s; MET]
Trigger Stop: 278865284.608 [s; MET]
UTC: 2009-11-02T14:34:38.358760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 72.6742345146145 Dec: -72.5096722528519 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.01
Image Trigger?: NO
Rate S/N Ratio: 29.8496231131986 [ if not an image trigger ]
Image S/N Ratio: 13.01
Flight Position: [ source = BAT ]
RA: 72.6742345146145 Dec: -72.5096722528519 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 72.6220250532324 Dec: -72.527242146902 [deg; J2000]
{ 04h 50m 29.3s , -72d 31' 38.1" }
+/- 1.18817783797711 [arcmin] (estimated 90% radius based on SNR)
+/- 0.444313842100737 [arcmin] (formal 1-sigma fit error)
SNR: 23.7763334795224
Angular difference between Flight and Ground position is 1.413096 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 6.64399999380112 +/- 0.456793168187455
Measured from: -0.415999889373779
to: 6.22800010442734 [s; relative to TRIGTIME]
T50: 3.38399994373322 +/- 0.8529126312612
Measured from: 0.544000148773193
to: 3.92800009250641 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.255999982357025
to: 0.744000017642975 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.779999971389771
to: 6.63200002908707 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.146508 0.270376 0.238548 0.105254
0.015271 0.017029 0.016113 0.014643 [error]
Peak 0.040059 0.065752 0.062147 0.023180
0.005827 0.006666 0.006543 0.005973 [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 4.29e-08 1.02e-07 1.94e-07 8.90e-07 5.24e-07 1.23e-06 erg/cm2
Error 5.74e-09 8.07e-09 1.55e-08 1.63e-07 4.01e-08 1.72e-07 erg/cm2
Peak flux Power-law 3.33e-01 4.36e-01 4.20e-01 7.17e-01 1.43e+00 1.91e+00 ph/cm2/s
Error 6.77e-02 5.41e-02 5.24e-02 1.92e-01 1.53e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 4.17e-08 1.04e-07 1.96e-07 6.99e-07 5.19e-07 1.04e-06 erg/cm2
Error 6.74e-09 9.21e-09 1.74e-08 2.99e-07 4.43e-08 3.48e-07 erg/cm2
Peak flux Cutoff-PL 3.12e-01 4.50e-01 4.33e-01 4.77e-01 1.41e+00 1.67e+00 ph/cm2/s
Error 7.90e-02 4.73e-02 5.98e-02 2.85e-01 1.58e-01 3.72e-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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.079 0.121 - - 6.72e-03 4.55e-04 40.510 57
CPL 0.924 0.383 370.2 0.0 7.98e-03 3.70e-03 40.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.057 0.185 - - 1.23e-02 1.32e-03 70.560 57
CPL 0.719 0.617 196.8 0.0 1.81e-02 1.65e-02 69.870 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: 6.656000 sec.
T50 in the 50-300 keV band: 4.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.412 -0.780 6.632
T90 6.644 -0.416 6.228
T50 3.384 0.544 3.928
Peak 1.000 -0.256 0.744
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
72.6220 -72.5272 0.0080 17.4 -81.4 0.7821 23.8 TRIG_00374598
------------------------------------------
Foreground time interval of the image:
-0.780 6.632 (delta_t = 7.412 [sec])
Background time interval of the image:
-239.584 -0.780 (delta_t = 238.804 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.780 sec. to 6.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07907 ( -0.121762 0.119918 )
Norm@50keV : 6.72249E-03 ( -0.000454684 0.00045457 )
------------------------------------------------------------
# Chi-Squared = 40.51 using 59 PHA bins.
# Reduced chi-squared = 0.7107 for 57 degrees of freedom
# Null hypothesis probability = 9.516612e-01
Photon flux (15-150 keV) in 7.412 sec: 0.778261 ( -0.053659 0.053706 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2449e-07 ( -3.99876e-08 4.02425e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.780 sec. to 6.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.923695 ( -0.507288 0.259291 )
Epeak [keV] : 370.235 ( -370.298 -370.298 )
Norm@50keV : 7.98005E-03 ( -0.00164125 0.00576661 )
------------------------------------------------------------
# Chi-Squared = 40.18 using 59 PHA bins.
# Reduced chi-squared = 0.7176 for 56 degrees of freedom
# Null hypothesis probability = 9.451384e-01
Photon flux (15-150 keV) in 7.412 sec: 0.773026 ( -0.056637 0.054558 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18569e-07 ( -4.47618e-08 4.38398e-08 ) ergs/cm2
Band function
Time interval is from -0.780 sec. to 6.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.76671E-02 ( 0.193524 0.193524 )
beta : -1.22993 ( 1.22807 0.210239 )
Epeak [keV] : 70.2183 ( -69.9917 250.948 )
Norm@50keV : 2.97740E-02 ( -0.0302391 77.0275 )
------------------------------------------------------------
# Chi-Squared = 38.09 using 59 PHA bins.
# Reduced chi-squared = 0.6925 for 55 degrees of freedom
# Null hypothesis probability = 9.599972e-01
Photon flux (15-150 keV) in 7.412 sec: ( ) 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 -0.256 sec. to 0.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05705 ( -0.18731 0.183431 )
Norm@50keV : 1.23468E-02 ( -0.00131701 0.00131697 )
------------------------------------------------------------
# Chi-Squared = 70.56 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 57 degrees of freedom
# Null hypothesis probability = 1.070043e-01
Photon flux (15-150 keV) in 1 sec: 1.42678 ( -0.153231 0.153348 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30912e-07 ( -1.61058e-08 1.63149e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.256 sec. to 0.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.719349 ( -0.803315 0.430533 )
Epeak [keV] : 196.760 ( -196.848 -196.848 )
Norm@50keV : 1.81157E-02 ( -0.00724578 0.0257416 )
------------------------------------------------------------
# Chi-Squared = 69.87 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 56 degrees of freedom
# Null hypothesis probability = 1.007501e-01
Photon flux (15-150 keV) in 1 sec: 1.40763 ( -0.15875 0.15775 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27228e-07 ( -1.8333e-08 1.7831e-08 ) ergs/cm2
Band function
Time interval is from -0.256 sec. to 0.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96126 ( -61.2884 -51.2888 )
beta : -1.17535 ( -0.236432 0.212179 )
Epeak [keV] : 28.9824 ( -9.47904 7.26872 )
Norm@50keV : 364.406 ( -83.7499 96.2358 )
------------------------------------------------------------
# Chi-Squared = 67.61 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 55 degrees of freedom
# Null hypothesis probability = 1.182320e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Nov 3 03:21:34 EST 2009