batgrbproduct Analysis for Trigger=355911
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 Jun 28 23:42:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355911/GCN5_download_cron
======================================================================
Trigger: 00355911 Segment: 000
BAT Trigger Time: 267869168 [s; MET]
Trigger Stop: 267869680 [s; MET]
UTC: 2009-06-28T08:06:03.135260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 281.258249917138 Dec: -4.57509375432809 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.99
Flight Position: [ source = BAT ]
RA: 281.258249917138 Dec: -4.57509375432809 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 281.29052600554 Dec: -4.48377415649073 [deg; J2000]
{ 18h 45m 09.7s , -04d 29' 01.6" }
+/- 4.73270310205594 [arcmin] (estimated 90% radius based on SNR)
+/- 2.52886223821374 [arcmin] (formal 1-sigma fit error)
SNR: 3.30123605069314
Angular difference between Flight and Ground position is 5.809326 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 641.640000015497 +/- 193.241359760456
Measured from: 40.1200000941753
to: 681.760000109673 [s; relative to TRIGTIME]
T50: 263.840000003576 +/- 291.009107669091
Measured from: 153.168000102043
to: 417.008000105619 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 734.99200001359
to: 735.99200001359 [s; relative to TRIGTIME]
Total Fluence
Measured from: 8.43200001120567
to: 790.696000009775 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.084057 1.083927 0.307651 -0.036893
0.150058 0.148323 0.129491 0.114803 [error]
Peak 0.032121 0.046076 -0.005829 0.017345
0.022666 0.020601 0.021043 0.018886 [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 3.38e-07 3.59e-07 2.70e-07 3.30e-07 1.09e-06 1.30e-06 erg/cm2
Error 6.41e-08 6.80e-08 9.77e-08 2.21e-07 2.34e-07 3.69e-07 erg/cm2
Peak flux Power-law 1.55e-01 3.98e-02 5.39e-03 8.22e-04 2.00e-01 2.00e-01 ph/cm2/s
Error 2.11e-01 4.53e-02 5.62e-03 4.23e-03 2.59e-01 2.59e-01 ph/cm2/s
Fluence Cutoff-PL 3.24e-07 4.30e-07 1.93e-07 2.07e-08 9.66e-07 9.68e-07 erg/cm2
Error 7.02e-08 9.26e-08 1.22e-07 9.36e-08 2.14e-07 2.33e-07 erg/cm2
Peak flux Cutoff-PL 2.12e-01 3.31e-01 7.64e-02 9.07e-04 6.21e-01 6.21e-01 ph/cm2/s
Error 1.98e-01 1.93e-01 4.99e-02 9.67e-04 3.75e-01 3.75e-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 2.411 0.335 - - 1.43e-04 3.85e-05 56.740 57
CPL 0.768 1.719 26.1 0.0 1.65e-03 0.00e+00 52.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.883 0.000 - - 3.59e-04 3.80e-04 52.070 57
CPL -3.771 0.217 41.3 9.6 7.84e+00 1.96e+01 45.220 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 782.264 8.432 790.696
T90 641.640 40.120 681.760
T50 263.840 153.168 417.008
Peak 1.000 734.992 735.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
281.2905 -4.4838 0.0584 1.5 82.3 4.3070 3.3 TRIG_00355911
------------------------------------------
Foreground time interval of the image:
8.432 532.301 (delta_t = 523.869 [sec])
Background time interval of the image:
-5.499 8.432 (delta_t = 13.931 [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 8.432 sec. to 790.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41058 ( -0.312561 0.35774 )
Norm@50keV : 1.42968E-04 ( -3.84226e-05 3.86645e-05 )
------------------------------------------------------------
# Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.847872e-01
Photon flux (15-150 keV) in 782.3 sec: 2.66171E-02 ( -0.00434972 0.00435606 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09362e-06 ( -2.2718e-07 2.41415e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.432 sec. to 790.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.768311 ( -2.20968 1.22893 )
Epeak [keV] : 26.0783 ( )
Norm@50keV : 1.64884E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.32 using 59 PHA bins.
# Reduced chi-squared = 0.9343 for 56 degrees of freedom
# Null hypothesis probability = 6.150233e-01
Photon flux (15-150 keV) in 782.3 sec: 2.59885E-02 ( -0.0042314 0.004269 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66195e-07 ( -1.96331e-07 2.31318e-07 ) ergs/cm2
Band function
Time interval is from 8.432 sec. to 790.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.806701 ( -0.982483 2.2125 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 26.2253 ( -13.0461 8.67538 )
Norm@50keV : 1.52970E-03 ( -0.000767051 0 )
------------------------------------------------------------
# Chi-Squared = 52.33 using 59 PHA bins.
# Reduced chi-squared = 0.9515 for 55 degrees of freedom
# Null hypothesis probability = 5.770951e-01
Photon flux (15-150 keV) in 782.3 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 734.992 sec. to 735.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.88334 ( -3.88334 -3.88334 )
Norm@50keV : 3.59414E-04 ( -0.000359414 0.000400239 )
------------------------------------------------------------
# Chi-Squared = 52.07 using 59 PHA bins.
# Reduced chi-squared = 0.9134 for 57 degrees of freedom
# Null hypothesis probability = 6.602552e-01
Photon flux (15-150 keV) in 1 sec: 0.200327 ( -0.200328 0.317829 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.28307e-09 ( -7.28307e-09 1.06471e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 734.992 sec. to 735.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.77103 ( 3.77873 4.21306 )
Epeak [keV] : 41.3293 ( -12.0044 7.21184 )
Norm@50keV : 7.83813 ( -7.9191 31.2947 )
------------------------------------------------------------
# Chi-Squared = 45.22 using 59 PHA bins.
# Reduced chi-squared = 0.8074 for 56 degrees of freedom
# Null hypothesis probability = 8.481898e-01
Photon flux (15-150 keV) in 1 sec: 0.620845 ( -0.367141 0.382195 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31017e-08 ( -1.882e-08 1.8647e-08 ) ergs/cm2
Band function
Time interval is from 734.992 sec. to 735.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38550 ( 1.13897 1.13897 )
beta : -10.00000 ( 8.80855e+12 8.80855e+12 )
Epeak [keV] : 40.5335 ( -18.0721 7.06276 )
Norm@50keV : 19.5179 ( -18.2682 44.7903 )
------------------------------------------------------------
# Chi-Squared = 45.18 using 59 PHA bins.
# Reduced chi-squared = 0.8214 for 55 degrees of freedom
# Null hypothesis probability = 8.249184e-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 00:11:15 EDT 2009