batgrbproduct Analysis for Trigger=306737
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): Wed Mar 19 09:54:25 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306737/GCN5_download_cron
======================================================================
Trigger: 00306737 Segment: 000
BAT Trigger Time: 227572375.168 [s; MET]
Trigger Stop: 227572383.36 [s; MET]
UTC: 2008-03-18T22:32:52.515040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.517375923447 Dec: -19.0438737356187 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.49
Image Trigger?: NO
Rate S/N Ratio: 10.5830052442584 [ if not an image trigger ]
Image S/N Ratio: 6.49
Flight Position: [ source = BAT ]
RA: 272.517375923447 Dec: -19.0438737356187 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.530674880145 Dec: -19.0386019996607 [deg; J2000]
{ 18h 10m 07.4s , -19d 02' 19.0" }
+/- 5.38701565954659 [arcmin] (estimated 90% radius based on SNR)
+/- 3.40913193121487 [arcmin] (formal 1-sigma fit error)
SNR: 2.74369090000538
RA = 18h 10m 7.4s (272.530675 deg.)
Dec = -19d 2' 19" (-19.038602 deg.)
Angular difference between Flight and Ground position is 0.817914 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
T50: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200000166893 second)
Measured from: -1.49011611938477e-08
to: 8.19199998676777 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.102824 0.020155 -0.016536 -0.010615
0.015798 0.013487 0.011288 0.009642 [error]
Peak 0.102824 0.020155 -0.016536 -0.010615
0.015798 0.013487 0.011288 0.009642 [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 3.05e-08 7.50e-09 9.63e-10 1.38e-10 3.90e-08 3.90e-08 erg/cm2
Error 7.72e-09 5.40e-09 1.73e-09 5.54e-10 1.28e-08 1.29e-08 erg/cm2
Peak flux Power-law 1.29e-01 1.83e-02 1.18e-03 8.02e-05 1.48e-01 1.48e-01 ph/cm2/s
Error 3.22e-02 1.26e-02 2.05e-03 2.98e-04 4.06e-02 4.07e-02 ph/cm2/s
Fluence Cutoff-PL 3.04e-08 7.50e-09 9.60e-10 1.37e-10 3.90e-08 3.90e-08 erg/cm2
Error 7.72e-09 5.40e-09 1.73e-09 5.50e-10 1.28e-08 1.29e-08 erg/cm2
Peak flux Cutoff-PL 1.29e-01 1.83e-02 1.17e-03 7.96e-05 1.48e-01 1.48e-01 ph/cm2/s
Error 3.22e-02 1.26e-02 2.05e-03 2.96e-04 4.06e-02 4.06e-02 ph/cm2/s
Fluence Band 3.01e-08 7.63e-09 1.00e-09 9.09e-11 3.83e-08 5.70e-08 erg/cm2
Error 7.54e-09 5.41e-09 5.00e-10 1.08e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.29e-01 1.83e-02 1.17e-03 7.96e-05 1.48e-01 1.48e-01 ph/cm2/s
Error 3.22e-02 1.26e-02 2.05e-03 2.96e-04 4.06e-02 4.06e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.698 1.263 - - 1.31e-04 1.43e-04 33.202 57
CPL 1.466 0.000 3.1 6.3 8.41e-02 0.00e+00 32.471 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.698 1.263 - - 1.31e-04 1.43e-04 33.202 57
CPL 1.466 0.000 3.1 6.3 8.41e-02 0.00e+00 32.471 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 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 -0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.5307 -19.0386 0.0697 9.0 -147.3 0.0740 2.7 TRIG_00306737
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [sec])
Background time interval of the image:
-60.168 -23.168 (delta_t = 37.000 [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 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.69790 ( -0.789492 1.73726 )
Norm@50keV : 1.307490E-04 ( -1.307490E-04 1.546915E-04) )
------------------------------------------------------------
Chi-Squared = 33.20204 using 59 PHA bins.
Reduced chi-squared = 0.5824919 for 57 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 8.192 sec: 0.148303 ( -0.040536 0.040737 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90021e-08 ( -1.21889e-08 1.33944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46592 ( )
Epeak [keV] : 3.11941 ( -4.47415 8.14309 )
Norm@50keV : 8.411438E-02 ( )
------------------------------------------------------------
Chi-Squared = 32.47107 using 59 PHA bins.
Reduced chi-squared = 0.5798406 for 56 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 8.192 sec: 0.148177 ( -0.040524 0.040723 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89923e-08 ( -1.21949e-08 1.33938e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.15723 ( -0.842772 2.62768 )
beta : -4.96139 ( -1.42671 1.02697 )
Epeak [keV] : 12.8431 ( -12.7431 9987.16 )
Norm@50keV : 1.355233E-02 ( -1.355233E-02 2.439252E-02) )
------------------------------------------------------------
Chi-Squared = 33.05709 using 59 PHA bins.
Reduced chi-squared = 0.6010379 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 8.192 sec: 0.148175 ( -0.040575 0.040725 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82788e-08 ( -1.13085e-08 1.01992e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.69790 ( -0.789492 1.73726 )
Norm@50keV : 1.307490E-04 ( -1.307490E-04 1.546915E-04) )
------------------------------------------------------------
Chi-Squared = 33.20204 using 59 PHA bins.
Reduced chi-squared = 0.5824919 for 57 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 8.192 sec: 0.148303 ( -0.040536 0.040737 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90021e-08 ( -1.21889e-08 1.33944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46592 ( )
Epeak [keV] : 3.11941 ( -4.47415 8.14309 )
Norm@50keV : 8.411438E-02 ( )
------------------------------------------------------------
Chi-Squared = 32.47107 using 59 PHA bins.
Reduced chi-squared = 0.5798406 for 56 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 8.192 sec: 0.148177 ( -0.040524 0.040723 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89923e-08 ( -1.21949e-08 1.33938e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.15723 ( -0.842772 2.62768 )
beta : -4.96139 ( -1.42671 1.02697 )
Epeak [keV] : 12.8431 ( -12.7431 9987.16 )
Norm@50keV : 1.355233E-02 ( -1.355233E-02 2.439252E-02) )
------------------------------------------------------------
Chi-Squared = 33.05709 using 59 PHA bins.
Reduced chi-squared = 0.6010379 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 8.192 sec: 0.148175 ( -0.040575 0.040725 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82788e-08 ( -1.13085e-08 1.01992e-08 ) ergs/cm2
Plot creation:
Wed Mar 19 10:03:27 EDT 2008