batgrbproduct Analysis for Trigger=356890
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): Thu Jul 9 21:53:31 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356890/GCN5_download_cron
======================================================================
Trigger: 00356890 Segment: 000
BAT Trigger Time: 268817919.488 [s; MET]
Trigger Stop: 268817920.512 [s; MET]
UTC: 2009-07-09T07:38:34.592520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 289.933176236556 Dec: 60.7311647159044 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.31
Image Trigger?: NO
Rate S/N Ratio: 43.5430821141545 [ if not an image trigger ]
Image S/N Ratio: 17.31
Flight Position: [ source = BAT ]
RA: 289.933176236556 Dec: 60.7311647159044 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 289.944856262633 Dec: 60.7279960808192 [deg; J2000]
{ 19h 19m 46.8s , +60d 43' 40.8" }
+/- 0.666181035154213 [arcmin] (estimated 90% radius based on SNR)
+/- 0.1703144832764 [arcmin] (formal 1-sigma fit error)
SNR: 54.341225695736
Angular difference between Flight and Ground position is 0.391855 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 88.6999999880791 +/- 1.09903233045138
Measured from: -1.19999986886978
to: 87.5000001192093 [s; relative to TRIGTIME]
T50: 31.0719999670982 +/- 0.450919067970491
Measured from: 23.240000128746
to: 54.3120000958443 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.8120000362396
to: 22.8120000362396 [s; relative to TRIGTIME]
Total Fluence
Measured from: -67.2960000038147
to: 101.540000021458 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.023056 13.129590 12.417906 3.714867
0.083283 0.091919 0.087283 0.072808 [error]
Peak 0.190027 0.333851 0.361929 0.121358
0.008960 0.011150 0.011540 0.008931 [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 2.51e-06 5.46e-06 9.36e-06 3.70e-05 2.57e-05 5.44e-05 erg/cm2
Error 7.83e-08 1.01e-07 1.24e-07 1.18e-06 3.29e-07 1.20e-06 erg/cm2
Peak flux Power-law 1.76e+00 2.36e+00 2.32e+00 4.09e+00 7.78e+00 1.05e+01 ph/cm2/s
Error 1.29e-01 1.04e-01 9.27e-02 3.58e-01 2.84e-01 4.23e-01 ph/cm2/s
Fluence Cutoff-PL 2.38e-06 5.47e-06 9.53e-06 3.16e-05 2.55e-05 4.90e-05 erg/cm2
Error 1.12e-07 1.02e-07 1.64e-07 3.27e-06 3.39e-07 3.03e-06 erg/cm2
Peak flux Cutoff-PL 1.64e+00 2.39e+00 2.39e+00 3.08e+00 7.69e+00 9.51e+00 ph/cm2/s
Error 1.64e-01 1.11e-01 1.14e-01 7.81e-01 2.93e-01 7.21e-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 1.223 0.025 - - 1.51e-02 2.10e-04 37.430 57
CPL 1.071 0.102 395.0 361.5 1.73e-02 1.53e-03 30.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.024 0.064 - - 6.75e-02 2.42e-03 38.250 57
CPL 0.747 0.251 258.2 419.3 8.98e-02 2.28e-02 34.490 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: 73.280000 sec.
T50 in the 50-300 keV band: 26.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 168.836 -67.296 101.540
T90 88.700 -1.200 87.500
T50 31.072 23.240 54.312
Peak 1.000 21.812 22.812
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
289.9449 +60.7280 0.0036 19.1 -93.2 6.5198 54.3 TRIG_00356890
------------------------------------------
Foreground time interval of the image:
-50.087 16.313 (delta_t = 66.400 [sec])
Background time interval of the image:
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 -67.296 sec. to 101.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22311 ( -0.0246232 0.0245332 )
Norm@50keV : 1.50793E-02 ( -0.000210325 0.000209922 )
------------------------------------------------------------
# Chi-Squared = 37.43 using 59 PHA bins.
# Reduced chi-squared = 0.6567 for 57 degrees of freedom
# Null hypothesis probability = 9.790200e-01
Photon flux (15-150 keV) in 168.8 sec: 1.77598 ( -0.0280079 0.0280865 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56586e-05 ( -3.28562e-07 3.2861e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -67.296 sec. to 101.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07097 ( -0.102838 0.100659 )
Epeak [keV] : 395.048 ( -131.31 591.722 )
Norm@50keV : 1.72631E-02 ( -0.00144974 0.00161021 )
------------------------------------------------------------
# Chi-Squared = 30.77 using 59 PHA bins.
# Reduced chi-squared = 0.5495 for 56 degrees of freedom
# Null hypothesis probability = 9.975665e-01
Photon flux (15-150 keV) in 168.8 sec: 1.75306 ( -0.03116 0.01572 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55459e-05 ( -3.38444e-07 3.3895e-07 ) ergs/cm2
Band function
Time interval is from -67.296 sec. to 101.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07098 ( -0.422871 4.1823 )
beta : -10.00000 ( 2.43777e+11 2.43777e+11 )
Epeak [keV] : 395.016 ( -131.297 591.594 )
Norm@50keV : 1.72611E-02 ( -0.00144982 0.00161046 )
------------------------------------------------------------
# Chi-Squared = 30.77 using 59 PHA bins.
# Reduced chi-squared = 0.5595 for 55 degrees of freedom
# Null hypothesis probability = 9.966459e-01
Photon flux (15-150 keV) in 168.8 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 21.812 sec. to 22.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02412 ( -0.0637966 0.0634516 )
Norm@50keV : 6.74802E-02 ( -0.00241764 0.00241659 )
------------------------------------------------------------
# Chi-Squared = 38.25 using 59 PHA bins.
# Reduced chi-squared = 0.6711 for 57 degrees of freedom
# Null hypothesis probability = 9.733334e-01
Photon flux (15-150 keV) in 1 sec: 7.77985 ( -0.283753 0.283743 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23572e-07 ( -2.89018e-08 2.90397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.812 sec. to 22.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.746579 ( -0.260025 0.242867 )
Epeak [keV] : 258.181 ( -97.161 741.478 )
Norm@50keV : 8.98285E-02 ( -0.0190314 0.0266126 )
------------------------------------------------------------
# Chi-Squared = 34.49 using 59 PHA bins.
# Reduced chi-squared = 0.6158 for 56 degrees of freedom
# Null hypothesis probability = 9.895132e-01
Photon flux (15-150 keV) in 1 sec: 7.68618 ( -0.29452 0.29225 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.13613e-07 ( -3.0736e-08 4.4726e-08 ) ergs/cm2
Band function
Time interval is from 21.812 sec. to 22.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -51623.7 -51623.7 )
beta : -1.05654 ( -0.0699051 0.0840258 )
Epeak [keV] : 26.0562 ( -26.0562 3.80743 )
Norm@50keV : 3628.14 ( -1993.23 9.72086e+06 )
------------------------------------------------------------
# Chi-Squared = 35.83 using 59 PHA bins.
# Reduced chi-squared = 0.6515 for 55 degrees of freedom
# Null hypothesis probability = 9.788902e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Jul 9 22:13:51 EDT 2009