batgrbproduct Analysis for Trigger=357512
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 16 12:02:33 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357512/GCN5_download_cron
======================================================================
Trigger: 00357512 Segment: 000
BAT Trigger Time: 269384599.552 [s; MET]
Trigger Stop: 269384600.576 [s; MET]
UTC: 2009-07-15T21:03:14.638140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.344210801804 Dec: 44.8267357756654 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.48
Image Trigger?: NO
Rate S/N Ratio: 24.9599679486974 [ if not an image trigger ]
Image S/N Ratio: 11.48
Flight Position: [ source = BAT ]
RA: 251.344210801804 Dec: 44.8267357756654 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.337051354668 Dec: 44.8368238756626 [deg; J2000]
{ 16h 45m 20.9s , +44d 50' 12.6" }
+/- 0.607105393988227 [arcmin] (estimated 90% radius based on SNR)
+/- 0.136158228250707 [arcmin] (formal 1-sigma fit error)
SNR: 62.049902928936
Angular difference between Flight and Ground position is 0.677626 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 266.379999935627 +/- 11.6124872406576
Measured from: -0.715999841690063
to: 265.664000093937 [s; relative to TRIGTIME]
T50: 63.8439999222755 +/- 1.14710066990627
Measured from: 5.78400015830994
to: 69.6280000805855 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.45600003004074
to: 7.45600003004074 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.6480000019073
to: 292.31200003624 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.986115 3.631885 2.562187 0.562544
0.090129 0.094674 0.086032 0.080392 [error]
Peak 0.118560 0.178236 0.152037 0.038901
0.006756 0.007726 0.007357 0.005616 [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 8.22e-07 1.45e-06 1.95e-06 5.38e-06 5.65e-06 9.60e-06 erg/cm2
Error 5.21e-08 5.15e-08 8.78e-08 5.54e-07 2.05e-07 6.08e-07 erg/cm2
Peak flux Power-law 1.07e+00 1.21e+00 9.84e-01 1.33e+00 3.76e+00 4.60e+00 ph/cm2/s
Error 9.62e-02 6.53e-02 5.89e-02 1.69e-01 1.84e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 8.22e-07 1.45e-06 1.95e-06 5.34e-06 5.65e-06 9.18e-06 erg/cm2
Error 5.22e-08 5.15e-08 8.80e-08 5.50e-07 2.05e-07 1.10e-06 erg/cm2
Peak flux Cutoff-PL 1.05e+00 1.23e+00 9.95e-01 1.15e+00 3.73e+00 4.42e+00 ph/cm2/s
Error 1.15e-01 6.94e-02 6.51e-02 3.04e-01 1.90e-01 4.04e-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 1.572 0.066 - - 1.98e-03 6.61e-05 56.140 57
CPL 1.569 0.000 10000.0 0.0 1.99e-03 6.64e-05 56.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.302 0.087 - - 3.15e-02 1.53e-03 34.000 57
CPL 1.183 0.251 357.0 0.0 3.60e-02 1.09e-02 33.590 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: 72.256000 sec.
T50 in the 50-300 keV band: 43.904000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 303.960 -11.648 292.312
T90 266.380 -0.716 265.664
T50 63.844 5.784 69.628
Peak 1.000 6.456 7.456
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.3371 +44.8368 0.0031 5.3 -66.4 3.9630 62.0 TRIG_00357512
------------------------------------------
Foreground time interval of the image:
-11.648 9.649 (delta_t = 21.297 [sec])
Background time interval of the image:
-239.552 -11.648 (delta_t = 227.904 [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 -11.648 sec. to 292.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57166 ( -0.065622 0.0658903 )
Norm@50keV : 1.98128E-03 ( -6.62009e-05 6.60104e-05 )
------------------------------------------------------------
# Chi-Squared = 56.14 using 59 PHA bins.
# Reduced chi-squared = 0.9849 for 57 degrees of freedom
# Null hypothesis probability = 5.074275e-01
Photon flux (15-150 keV) in 304 sec: 0.252420 ( -0.00877049 0.00880516 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65328e-06 ( -2.04817e-07 2.0569e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.648 sec. to 292.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56949 ( )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.98629E-03 ( -6.65482e-05 6.6339e-05 )
------------------------------------------------------------
# Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.692905e-01
Photon flux (15-150 keV) in 304 sec: 0.252287 ( -0.008765 0.008801 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65321e-06 ( -2.04835e-07 2.05747e-07 ) ergs/cm2
Band function
Time interval is from -11.648 sec. to 292.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.46619 ( -3.10169 -3.10169 )
beta : -1.58152 ( -0.0690771 0.0673773 )
Epeak [keV] : 20.7502 ( -21.4583 7.02413 )
Norm@50keV : 39.1150 ( -39.1213 464.624 )
------------------------------------------------------------
# Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.594716e-01
Photon flux (15-150 keV) in 304 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 6.456 sec. to 7.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30210 ( -0.0865891 0.0867051 )
Norm@50keV : 3.14625E-02 ( -0.00152834 0.00152579 )
------------------------------------------------------------
# Chi-Squared = 34.00 using 59 PHA bins.
# Reduced chi-squared = 0.5965 for 57 degrees of freedom
# Null hypothesis probability = 9.933444e-01
Photon flux (15-150 keV) in 1 sec: 3.75501 ( -0.183631 0.183757 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10747e-07 ( -1.72044e-08 1.72961e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18265 ( -0.337357 0.163952 )
Epeak [keV] : 357.032 ( -357.078 -357.078 )
Norm@50keV : 3.59920E-02 ( -0.00580608 0.0160595 )
------------------------------------------------------------
# Chi-Squared = 33.59 using 59 PHA bins.
# Reduced chi-squared = 0.5998 for 56 degrees of freedom
# Null hypothesis probability = 9.923895e-01
Photon flux (15-150 keV) in 1 sec: 3.73349 ( -0.19032 0.18974 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.61322 ( -3.44431 -3.44431 )
beta : -1.36768 ( -0.124467 0.100892 )
Epeak [keV] : 29.4390 ( -29.378 91.5401 )
Norm@50keV : 25.4095 ( -25.5711 922.286 )
------------------------------------------------------------
# Chi-Squared = 31.33 using 59 PHA bins.
# Reduced chi-squared = 0.5696 for 55 degrees of freedom
# Null hypothesis probability = 9.957578e-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 16 12:35:43 EDT 2009