batgrbproduct Analysis for Trigger=355942
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): Mon Jun 29 02:30:37 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355942/GCN5_download_cron
======================================================================
Trigger: 00355942 Segment: 000
BAT Trigger Time: 267916816.896 [s; MET]
Trigger Stop: 267916817.92 [s; MET]
UTC: 2009-06-28T21:20:12.029720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.049710631592 Dec: -15.9769445036211 [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: 15.3622914957372 [ if not an image trigger ]
Image S/N Ratio: 10.03
Flight Position: [ source = BAT ]
RA: 237.049710631592 Dec: -15.9769445036211 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.037508791526 Dec: -15.9691568836679 [deg; J2000]
{ 15h 48m 09.0s , -15d 58' 09.0" }
+/- 1.70955149733464 [arcmin] (estimated 90% radius based on SNR)
+/- 0.755266545523196 [arcmin] (formal 1-sigma fit error)
SNR: 14.1393531068066
Angular difference between Flight and Ground position is 0.844823 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 20.0999999940395 +/- 4.60215296540474
Measured from: -16.6879999041557
to: 3.4120000898838 [s; relative to TRIGTIME]
T50: 11.1400000154972 +/- 3.77595128336567
Measured from: -9.65999990701675
to: 1.48000010848045 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000159740448
to: 1.05200001597404 [s; relative to TRIGTIME]
Total Fluence
Measured from: -25.0320000052452
to: 3.97600001096725 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.263730 0.335798 0.333315 0.116388
0.040565 0.037840 0.032495 0.028136 [error]
Peak 0.041021 0.068153 0.053838 0.009001
0.007987 0.007901 0.007005 0.005711 [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 8.03e-08 1.61e-07 2.51e-07 8.64e-07 7.01e-07 1.36e-06 erg/cm2
Error 1.69e-08 1.96e-08 3.27e-08 2.62e-07 8.04e-08 2.79e-07 erg/cm2
Peak flux Power-law 4.69e-01 4.90e-01 3.63e-01 4.33e-01 1.49e+00 1.75e+00 ph/cm2/s
Error 1.07e-01 6.92e-02 5.79e-02 1.42e-01 1.97e-01 2.31e-01 ph/cm2/s
Fluence Cutoff-PL 8.02e-08 1.61e-07 2.52e-07 8.58e-07 7.01e-07 1.29e-06 erg/cm2
Error 1.69e-08 1.96e-08 3.27e-08 2.60e-07 8.04e-08 8.33e-07 erg/cm2
Peak flux Cutoff-PL 4.24e-01 5.17e-01 3.78e-01 2.31e-01 1.45e+00 1.55e+00 ph/cm2/s
Error 1.25e-01 8.26e-02 6.53e-02 2.25e-01 2.04e-01 3.61e-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 1.358 0.200 - - 2.48e-03 2.60e-04 48.200 57
CPL 1.362 0.202 9999.4 0.0 2.49e-03 8.04e-04 48.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.436 0.222 - - 1.21e-02 1.58e-03 41.570 57
CPL 0.865 0.887 99.1 -30.7 2.36e-02 3.26e-02 40.280 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: 21.056000 sec.
T50 in the 50-300 keV band: 8.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.008 -25.032 3.976
T90 20.100 -16.688 3.412
T50 11.140 -9.660 1.480
Peak 1.000 0.052 1.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.0375 -15.9692 0.0136 31.3 -40.4 1.0800 14.1 TRIG_00355942
------------------------------------------
Foreground time interval of the image:
-25.032 3.976 (delta_t = 29.008 [sec])
Background time interval of the image:
-239.896 -25.032 (delta_t = 214.864 [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 -25.032 sec. to 3.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35764 ( -0.201553 0.198852 )
Norm@50keV : 2.47683E-03 ( -0.000259869 0.000259837 )
------------------------------------------------------------
# Chi-Squared = 48.20 using 59 PHA bins.
# Reduced chi-squared = 0.8456 for 57 degrees of freedom
# Null hypothesis probability = 7.903462e-01
Photon flux (15-150 keV) in 29.01 sec: 0.298860 ( -0.0333601 0.0334983 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00577e-07 ( -8.01349e-08 8.06725e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.032 sec. to 3.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36180 ( -0.210068 0.193277 )
Epeak [keV] : 9999.36 ( -9998.48 -9998.48 )
Norm@50keV : 2.48555E-03 ( -0.000260404 0.00134812 )
------------------------------------------------------------
# Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8611 for 56 degrees of freedom
# Null hypothesis probability = 7.606653e-01
Photon flux (15-150 keV) in 29.01 sec: 0.298729 ( -0.033347 0.033487 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00652e-07 ( -8.01662e-08 8.07029e-08 ) ergs/cm2
Band function
Time interval is from -25.032 sec. to 3.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91837 ( -25.3827 -25.3827 )
beta : -1.36978 ( -0.115756 0.202339 )
Epeak [keV] : 21.6882 ( -21.5491 7.61672 )
Norm@50keV : 465.422 ( -491.308 1466.28 )
------------------------------------------------------------
# Chi-Squared = 48.06 using 59 PHA bins.
# Reduced chi-squared = 0.8739 for 55 degrees of freedom
# Null hypothesis probability = 7.346979e-01
Photon flux (15-150 keV) in 29.01 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 0.052 sec. to 1.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43562 ( -0.22165 0.221846 )
Norm@50keV : 1.21196E-02 ( -0.00158516 0.00157965 )
------------------------------------------------------------
# Chi-Squared = 41.57 using 59 PHA bins.
# Reduced chi-squared = 0.7292 for 57 degrees of freedom
# Null hypothesis probability = 9.379053e-01
Photon flux (15-150 keV) in 1 sec: 1.48832 ( -0.19658 0.197079 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16289e-07 ( -1.6598e-08 1.67967e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.864908 ( -1.05054 0.72407 )
Epeak [keV] : 99.0541 ( -37.7527 -99.0542 )
Norm@50keV : 2.35971E-02 ( -0.01 0.0552137 )
------------------------------------------------------------
# Chi-Squared = 40.28 using 59 PHA bins.
# Reduced chi-squared = 0.7193 for 56 degrees of freedom
# Null hypothesis probability = 9.438494e-01
Photon flux (15-150 keV) in 1 sec: 1.45185 ( -0.20429 0.20424 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11217e-07 ( -1.85579e-08 1.8531e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.04662 ( -4.57272 -4.57272 )
beta : -1.63896 ( -0.40534 0.324182 )
Epeak [keV] : 35.2532 ( -35.2532 139.666 )
Norm@50keV : 2.60590 ( -2.43037 170.791 )
------------------------------------------------------------
# Chi-Squared = 39.32 using 59 PHA bins.
# Reduced chi-squared = 0.7149 for 55 degrees of freedom
# Null hypothesis probability = 9.453461e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Jun 29 02:55:14 EDT 2009