batgrbproduct Analysis for Trigger=358354
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): Sun Jul 26 12:16:45 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358354/GCN5_download_cron
======================================================================
Trigger: 00358354 Segment: 000
BAT Trigger Time: 270277096 [s; MET]
Trigger Stop: 270277160 [s; MET]
UTC: 2009-07-26T04:58:11.057240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.3341609012527 Dec: 22.8881599456419 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 18.13
Flight Position: [ source = BAT ]
RA: 85.3341609012527 Dec: 22.8881599456419 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.2003083941002 Dec: 22.9254182156688 [deg; J2000]
{ 05h 40m 48.1s , +22d 55' 31.5" }
+/- 0.875771638157099 [arcmin] (estimated 90% radius based on SNR)
+/- 0.353675685260409 [arcmin] (formal 1-sigma fit error)
SNR: 36.7635234497711
Angular difference between Flight and Ground position is 7.728195 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 588.175999939442 +/- 37.2021492197817
Measured from: 8.62400013208389
to: 596.800000071526 [s; relative to TRIGTIME]
T50: 285.655999958515 +/- 21.0155253014314
Measured from: 96.2080001235008
to: 381.864000082016 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -8.02399998903275
to: -7.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.1840000152588
to: 936.967999994755 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.233626 8.000774 4.023815 0.855304
0.182378 0.186756 0.161926 0.138078 [error]
Peak 0.029965 0.025633 0.010203 0.007364
0.006410 0.006237 0.005765 0.004722 [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 2.69e-06 3.46e-06 3.25e-06 5.39e-06 1.12e-05 1.48e-05 erg/cm2
Error 1.59e-07 1.14e-07 1.72e-07 6.19e-07 3.84e-07 7.47e-07 erg/cm2
Peak flux Power-law 2.93e-01 1.88e-01 7.83e-02 4.43e-02 5.82e-01 6.04e-01 ph/cm2/s
Error 9.80e-02 5.48e-02 4.33e-02 4.67e-02 1.55e-01 1.66e-01 ph/cm2/s
Fluence Cutoff-PL 3.81e-06 4.95e-06 4.70e-06 7.85e-06 1.61e-05 2.13e-05 erg/cm2
Error 2.32e-07 1.71e-07 2.62e-07 9.40e-07 5.84e-07 1.14e-06 erg/cm2
Peak flux Cutoff-PL 2.90e-01 1.96e-01 7.44e-02 2.39e-02 5.76e-01 5.84e-01 ph/cm2/s
Error 7.62e-02 6.85e-02 6.19e-02 5.21e-02 1.58e-01 1.72e-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 2.090 0.071 - - 1.45e-03 5.36e-05 57.070 57
CPL 1.994 0.070 3.6 0.0 1.60e-03 0.00e+00 58.240 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.266 0.579 - - 3.39e-03 1.43e-03 60.600 57
CPL 1.921 0.000 8.1 0.0 5.66e-03 0.00e+00 60.520 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: 273.408000 sec.
T50 in the 50-300 keV band: 155.456000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 949.152 -12.184 936.968
T90 588.176 8.624 596.800
T50 285.656 96.208 381.864
Peak 1.000 -8.024 -7.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.2003 +22.9254 0.0052 26.4 -50.1 30.3478 36.8 TRIG_00358354
------------------------------------------
Foreground time interval of the image:
-12.184 723.078 (delta_t = 735.262 [sec])
841.000 936.968 (delta_t = 95.968 [sec])
Background time interval of the image:
-239.000 -12.184 (delta_t = 226.816 [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
Multiple GTIs in the spectrum
tstart tstop
-12.184000 723.078200
841.000000 936.968000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08950 ( -0.0703145 0.0711851 )
Norm@50keV : 1.45372E-03 ( -5.38075e-05 5.34356e-05 )
------------------------------------------------------------
# Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.725300e-01
Photon flux (15-150 keV) in 831.2 sec: 0.227529 ( -0.00826775 0.00831446 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12155e-05 ( -3.83129e-07 3.84936e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-12.184000 723.078200
841.000000 936.968000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99369 ( -0.13683 0.00346606 )
Epeak [keV] : 3.64768 ( )
Norm@50keV : 1.59943E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.24 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 56 degrees of freedom
# Null hypothesis probability = 3.929411e-01
Photon flux (15-150 keV) in 831.2 sec: 0.324163 ( -0.012208 0.012271 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60909e-05 ( -5.82505e-07 5.85747e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-12.184000 723.078200
841.000000 936.968000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10388 ( )
beta : -7.62489 ( )
Epeak [keV] : 69.3868 ( )
Norm@50keV : 3.12386E-03 ( )
------------------------------------------------------------
# Chi-Squared = 143.67 using 59 PHA bins.
# Reduced chi-squared = 2.6121 for 55 degrees of freedom
# Null hypothesis probability = 7.436244e-10
Photon flux (15-150 keV) in 831.2 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 -8.024 sec. to -7.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26561 ( -0.518803 0.638475 )
Norm@50keV : 3.39432E-03 ( -0.00144924 0.00141796 )
------------------------------------------------------------
# Chi-Squared = 60.60 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.474633e-01
Photon flux (15-150 keV) in 1 sec: 0.582050 ( -0.155087 0.155256 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22397e-08 ( -1.09239e-08 1.20189e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.024 sec. to -7.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92068 ( )
Epeak [keV] : 8.13801 ( )
Norm@50keV : 5.65969E-03 ( )
------------------------------------------------------------
# Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.160518e-01
Photon flux (15-150 keV) in 1 sec: 0.576043 ( -0.157784 0.157492 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07577e-08 ( -1.22347e-08 9.696e-09 ) ergs/cm2
Band function
Time interval is from -8.024 sec. to -7.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99899 ( -1896.19 -1896.19 )
beta : -2.48605 ( -1.78146 0.622568 )
Epeak [keV] : 20.2397 ( -20.2304 7.3437 )
Norm@50keV : 3033.79 ( -2622.86 38062.3 )
------------------------------------------------------------
# Chi-Squared = 59.57 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.128344e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Jul 26 12:39:17 EDT 2009