batgrbproduct Analysis for Trigger=305611
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 v2.41
Process Start Time (local time): Thu Mar 13 01:53:01 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger305611/GCN5_download_cron
======================================================================
Trigger: 00305611 Segment: 000
BAT Trigger Time: 227023699.008 [s; MET]
Trigger Stop: 227023700.032 [s; MET]
UTC: 2008-03-12T14:08:16.370060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 26.1417219674953 Dec: -31.226714057607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.45
Image Trigger?: NO
Rate S/N Ratio: 8.18535277187245 [ if not an image trigger ]
Image S/N Ratio: 5.45
Flight Position: [ source = BAT ]
RA: 26.1417219674953 Dec: -31.226714057607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 26.108323687502 Dec: -31.3273083495091 [deg; J2000]
{ 01h 44m 26.0s , -31d 19' 38.3" }
+/- 6.487040752244 [arcmin] (estimated 90% radius based on SNR)
+/- 4.06940325927762 [arcmin] (formal 1-sigma fit error)
SNR: 2.1040292405962
RA = 1h 44m 26.0s (26.108324 deg.)
Dec = -31d 19' 38" (-31.327308 deg.)
Angular difference between Flight and Ground position is 6.273945 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: -1.49011611938477e-08
to: 1.02400000393391 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.010611 -0.007892 0.015379 0.012902
0.004804 0.004784 0.004488 0.004267 [error]
Peak -0.010611 -0.007892 0.015379 0.012902
0.004804 0.004784 0.004488 0.004267 [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 1.40e-10 9.47e-10 5.64e-09 1.63e-07 1.92e-08 1.68e-07 erg/cm2
Error 3.20e-10 1.26e-09 4.22e-09 2.01e-07 1.52e-08 2.03e-07 erg/cm2
Peak flux Power-law 4.19e-03 1.51e-02 4.49e-02 4.17e-01 1.25e-01 4.85e-01 ph/cm2/s
Error 9.81e-03 2.06e-02 3.45e-02 4.14e-01 8.79e-02 4.12e-01 ph/cm2/s
Fluence Cutoff-PL 1.41e-10 9.48e-10 5.66e-09 1.63e-07 1.92e-08 1.54e-07 erg/cm2
Error 3.19e-10 1.26e-09 4.25e-09 1.94e-07 1.52e-08 2.03e-07 erg/cm2
Peak flux Cutoff-PL 4.19e-03 1.51e-02 4.49e-02 4.16e-01 1.25e-01 4.82e-01 ph/cm2/s
Error 9.78e-03 2.06e-02 3.46e-02 4.44e-01 8.76e-02 4.38e-01 ph/cm2/s
Fluence Band 1.23e-17 8.65e-12 9.29e-09 2.27e-08 2.22e-08 0.00e+00 erg/cm2
Error 7.09e-09 2.15e-08 8.52e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.87e-04 1.41e-02 7.25e-02 9.45e-02 1.51e-01 3.64e-03 ph/cm2/s
Error 8.31e-03 2.36e-02 4.60e-02 1.89e-01 7.75e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.511 1.235 - - 7.51e-04 7.81e-04 60.348 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 0.00e+00 68.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.511 1.235 - - 7.51e-04 7.81e-04 60.348 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 0.00e+00 68.710 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
26.1083 -31.3273 0.0915 28.1 -24.0 0.0185 2.1 TRIG_00305611
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.008 -11.008 (delta_t = 49.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.510980 ( -1.53314 0.937651 )
Norm@50keV : 7.512956E-04 ( -7.512957E-04 8.097283E-04) )
------------------------------------------------------------
Chi-Squared = 60.34847 using 59 PHA bins.
Reduced chi-squared = 1.058745 for 57 degrees of freedom
Null hypothesis probability = 0.356
Photon flux (15-150 keV) in 1.024 sec: 0.124543 ( -0.0907903 0.085071 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92002e-08 ( -1.92002e-08 1.11285e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 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 = 68.70994 using 59 PHA bins.
Reduced chi-squared = 1.226963 for 56 degrees of freedom
Null hypothesis probability = 0.119
Photon flux (15-150 keV) in 1.024 sec: 0.124677 ( -0.0900499 0.085078 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92353e-08 ( -1.92353e-08 1.11446e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.22248 ( -13.2225 1.77752 )
beta : -9.09648 ( -0.903523 19.0965 )
Epeak [keV] : 8890.41 ( -9997.06 2.83984 )
Norm@50keV : 1.752222E-05 ( -1.284262E-02 1.208920E-02) )
------------------------------------------------------------
Chi-Squared = 63.75261 using 59 PHA bins.
Reduced chi-squared = 1.159138 for 55 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 1.024 sec: 0.150801 ( -0.0761613 0.078816 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22273e-08 ( -1.12128e-08 5.82871e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.510980 ( -1.53314 0.937651 )
Norm@50keV : 7.512956E-04 ( -7.512957E-04 8.097283E-04) )
------------------------------------------------------------
Chi-Squared = 60.34847 using 59 PHA bins.
Reduced chi-squared = 1.058745 for 57 degrees of freedom
Null hypothesis probability = 0.356
Photon flux (15-150 keV) in 1.024 sec: 0.124543 ( -0.0907903 0.085071 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92002e-08 ( -1.92002e-08 1.11285e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 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 = 68.70994 using 59 PHA bins.
Reduced chi-squared = 1.226963 for 56 degrees of freedom
Null hypothesis probability = 0.119
Photon flux (15-150 keV) in 1.024 sec: 0.124677 ( -0.0900499 0.085078 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92353e-08 ( -1.92353e-08 1.11446e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.22248 ( -13.2225 1.77752 )
beta : -9.09648 ( -0.903523 19.0965 )
Epeak [keV] : 8890.41 ( -9997.06 2.83984 )
Norm@50keV : 1.752222E-05 ( -1.284262E-02 1.208920E-02) )
------------------------------------------------------------
Chi-Squared = 63.75261 using 59 PHA bins.
Reduced chi-squared = 1.159138 for 55 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 1.024 sec: 0.150801 ( -0.0761613 0.078816 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22273e-08 ( -1.12128e-08 5.82871e-09 ) ergs/cm2
Plot creation:
Thu Mar 13 02:07:30 EDT 2008