batgrbproduct Analysis for Trigger=341055
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 v2.42
Process Start Time (local time): Sun Jan 25 10:35:36 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341055/GCN5_download_cron
======================================================================
Trigger: 00341055 Segment: 000
BAT Trigger Time: 254545645.316 [s; MET]
Trigger Stop: 254545645.38 [s; MET]
UTC: 2009-01-25T03:07:20.872240 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.701996149324 Dec: -54.3078764497662 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.21
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 9.21
Flight Position: [ source = BAT ]
RA: 237.701996149324 Dec: -54.3078764497662 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.723807679556 Dec: -54.3760752967797 [deg; J2000]
{ 15h 50m 53.7s , -54d 22' 33.9" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 4.89761493085657 [arcmin] (formal 1-sigma fit error)
SNR: -2.03754047788637
Angular difference between Flight and Ground position is 4.162440 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 49.227999985218 +/- 80.5495059026382
Measured from: 59.7200000882149
to: 108.948000073433 [s; relative to TRIGTIME]
T50: 28.1759999990463 +/- 16.1517290785898
Measured from: 65.8160000741482
to: 93.9920000731945 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0300000011920929
to: 0.969999998807907 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0240000188350677
to: 162.963999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018002 -0.060984 -0.004717 -0.034187
0.075033 0.066958 0.056970 0.050025 [error]
Peak 0.045690 0.023597 0.010345 -0.000351
0.006376 0.005486 0.004558 0.003848 [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 1.72e-10 2.08e-09 2.30e-08 1.91e-06 1.03e-07 0.00e+00 erg/cm2
Error 8.63e-09 7.47e-09 3.17e-08 2.20e-06 1.18e-07 0.00e+00 erg/cm2
Peak flux Power-law 3.68e-01 1.98e-01 6.67e-02 2.91e-02 6.48e-01 6.61e-01 ph/cm2/s
Error 9.86e-02 4.90e-02 3.48e-02 2.87e-02 1.35e-01 1.39e-01 ph/cm2/s
Fluence Cutoff-PL 4.59e-09 1.01e-10 2.24e-08 2.20e-06 1.05e-07 0.00e+00 erg/cm2
Error 1.37e-08 3.13e-08 2.51e-06 1.19e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.67e-01 1.98e-01 6.66e-02 2.89e-02 6.48e-01 6.61e-01 ph/cm2/s
Error 9.86e-02 4.91e-02 3.48e-02 2.85e-02 1.35e-01 1.39e-01 ph/cm2/s
Fluence Band 5.70e-12 1.38e-10 8.30e-09 1.05e-05 8.36e-08 0.00e+00 erg/cm2
Error 3.50e-09 2.92e-08 1.09e-05 1.24e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.69e-01 1.99e-01 6.69e-02 2.91e-02 6.52e-01 6.66e-01 ph/cm2/s
Error 1.04e-01 5.12e-02 3.00e-02 1.83e-02 1.37e-01 1.41e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 4.04e-05 60.568 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 0.00e+00 60.568 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.571 0.538 - - 3.16e-03 1.25e-03 50.495 57
CPL 1.985 0.000 1.0 16.3 6.88e-03 0.00e+00 51.616 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 162.988 -0.024 162.964
T90 49.228 59.720 108.948
T50 28.176 65.816 93.992
Peak 1.000 -0.030 0.970
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7238 -54.3761 0.0945 0.1 -0.7 -0.3982 -2.0 TRIG_00341055
------------------------------------------
Foreground time interval of the image:
-0.024 162.964 (delta_t = 162.988 [sec])
Background time interval of the image:
-119.316 -0.024 (delta_t = 119.292 [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 -0.024 sec. to 162.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 8.083320E-05) )
------------------------------------------------------------
Chi-Squared = 60.56844 using 59 PHA bins.
Reduced chi-squared = 1.062604 for 57 degrees of freedom
Null hypothesis probability = 0.348
Photon flux (15-150 keV) in 163.0 sec: 3.683526E-03 ( -0.00368353 0.00526219 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02994e-07 ( -1.02994e-07 1.33752e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 162.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( )
------------------------------------------------------------
Chi-Squared = 60.56844 using 59 PHA bins.
Reduced chi-squared = 1.081579 for 56 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 163.0 sec: 3.712159E-03 ( -0.00371216 0.00515843 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05351e-07 ( -1.05351e-07 1.331e-07 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 162.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( -3.289985E-02 1.109812E+06) )
------------------------------------------------------------
Chi-Squared = 60.56844 using 59 PHA bins.
Reduced chi-squared = 1.101244 for 55 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 163.0 sec: 2.535671E-03 ( -0.00253567 0.00522609 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35693e-08 ( -8.35693e-08 1.64154e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.024 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57100 ( -0.483408 0.592782 )
Norm@50keV : 3.157460E-03 ( -1.256206E-03 1.234756E-03) )
------------------------------------------------------------
Chi-Squared = 50.49474 using 59 PHA bins.
Reduced chi-squared = 0.8858725 for 57 degrees of freedom
Null hypothesis probability = 0.716
Photon flux (15-150 keV) in 0.9880 sec: 0.648259 ( -0.13521 0.135231 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18261e-08 ( -8.53365e-09 9.1723e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.964 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98520 ( )
Epeak [keV] : 1.04861 ( -0.388775 32.1630 )
Norm@50keV : 6.884867E-03 ( )
------------------------------------------------------------
Chi-Squared = 51.61575 using 59 PHA bins.
but latest trial 0.886864 gives Chi-Squared = 51.8803
Reduced chi-squared = 0.9217097 for 56 degrees of freedom
Null hypothesis probability = 0.641
Photon flux (15-150 keV) in 0.9880 sec: 0.647978 ( -0.13516 0.135181 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18222e-08 ( -8.53296e-09 9.16726e-09 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.82246 ( -7.51252 7.48748 )
beta : -9.25191 ( -0.592875 0.483391 )
Epeak [keV] : 7.37123 ( -7.27123 9992.63 )
Norm@50keV : 1.015650E-02 ( -0.171065 0.167875 )
------------------------------------------------------------
Chi-Squared = 52.13107 using 59 PHA bins.
Reduced chi-squared = 0.9478377 for 55 degrees of freedom
Null hypothesis probability = 0.585
Photon flux (15-150 keV) in 0.9880 sec: 0.651560 ( -0.137538 0.136813 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15431e-08 ( -7.82456e-09 6.57168e-09 ) ergs/cm2
Plot creation:
Sun Jan 25 10:54:12 EST 2009