batgrbproduct Analysis for Trigger=306757
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 10:48:49 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306757/GCN5_download_cron
======================================================================
Trigger: 00306757 Segment: 000
BAT Trigger Time: 227599971.904 [s; MET]
Trigger Stop: 227599972.928 [s; MET]
UTC: 2008-03-19T06:12:49.250280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 217.925715751808 Dec: 36.3029283586765 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.5
Image Trigger?: NO
Rate S/N Ratio: 206.729291586848 [ if not an image trigger ]
Image S/N Ratio: 22.5
Flight Position: [ source = BAT ]
RA: 217.925715751808 Dec: 36.3029283586765 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 217.919460843443 Dec: 36.2995554672312 [deg; J2000]
{ 14h 31m 40.7s , +36d 17' 58.4" }
+/- 0.357748265978004 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0799366836049112 [arcmin] (formal 1-sigma fit error)
SNR: 132.08842298801
RA = 14h 31m 40.7s (217.919461 deg.)
Dec = 36d 17' 58" (36.299555 deg.)
Angular difference between Flight and Ground position is 0.363915 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 45.1240000128746 +/- 0.179108908319785
Measured from: 4.75599998235703
to: 49.8799999952316 [s; relative to TRIGTIME]
T50: 24.052000015974 +/- 0.102450004591787
Measured from: 15.3239999711514
to: 39.3759999871254 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.8719999790192
to: 17.8719999790192 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.84400001168251
to: 151.023999989033 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 25.453574 39.189260 39.350040 12.940664
0.074725 0.089091 0.093388 0.073381 [error]
Peak 0.692787 1.086830 1.159321 0.376839
0.011033 0.013741 0.015018 0.011596 [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 6.32e-06 1.54e-05 3.01e-05 1.45e-04 8.13e-05 1.65e-04 erg/cm2
Error 2.02e-07 2.87e-07 3.30e-07 4.26e-06 8.84e-07 0.00e+00 erg/cm2
Peak flux Power-law 5.53e+00 7.49e+00 7.46e+00 1.34e+01 2.48e+01 3.39e+01 ph/cm2/s
Error 2.54e-01 1.99e-01 1.39e-01 6.12e-01 4.94e-01 6.38e-01 ph/cm2/s
Fluence Cutoff-PL 6.29e-06 1.54e-05 3.01e-05 1.44e-04 8.13e-05 9.57e-05 erg/cm2
Error 2.01e-07 2.87e-07 3.30e-07 4.17e-06 8.85e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.52e+00 7.49e+00 7.47e+00 1.33e+01 2.48e+01 3.38e+01 ph/cm2/s
Error 2.55e-01 2.01e-01 1.40e-01 6.11e-01 4.96e-01 6.40e-01 ph/cm2/s
Fluence Band 9.12e-06 2.34e-05 4.64e-05 2.26e-04 1.25e-04 1.40e-04 erg/cm2
Error 4.35e-07 5.07e-07 6.52e-06 1.36e-06 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.52e+00 7.49e+00 7.47e+00 1.33e+01 2.48e+01 3.33e+01 ph/cm2/s
Error 2.55e-01 2.01e-01 1.40e-01 6.11e-01 4.96e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.035 0.024 - - 7.85e-02 1.05e-03 15.795 57
CPL 1.029 0.024 9996.6 23.4 7.89e-02 1.05e-03 16.005 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.005 0.037 - - 2.16e-01 4.13e-03 41.586 57
CPL 0.998 0.038 9999.1 5000.0 2.17e-01 4.14e-03 41.625 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: 44.672000 sec.
T50 in the 50-300 keV band: 23.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 154.868 -3.844 151.024
T90 45.124 4.756 49.880
T50 24.052 15.324 39.376
Peak 1.000 16.872 17.872
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
217.9195 +36.2996 0.0015 11.7 0.9 19.5063 132.1 TRIG_00306757
------------------------------------------
Foreground time interval of the image:
-3.844 11.697 (delta_t = 15.541 [sec])
Background time interval of the image:
-119.904 -3.844 (delta_t = 116.060 [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
Multiple GTIs in the spectrum
tstart tstop
-3.844000 62.196000
120.096000 151.024000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03521 ( -2.402627E-02 2.390575E-02) )
Norm@50keV : 7.850518E-02 ( -1.050748E-03 1.043819E-03) )
------------------------------------------------------------
Chi-Squared = 15.79502 using 59 PHA bins.
Reduced chi-squared = 0.2771056 for 57 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 96.97 sec: 9.05746 ( -0.12973 0.13054 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13153e-05 ( -8.84269e-07 8.84657e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.844000 62.196000
120.096000 151.024000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02853 ( -2.422667E-02 2.410960E-02) )
Epeak [keV] : 9996.63 ( -43.4746 3.37305 )
Norm@50keV : 7.893650E-02 ( -1.050733E-03 1.043946E-03) )
------------------------------------------------------------
Chi-Squared = 16.00516 using 59 PHA bins.
Reduced chi-squared = 0.2858064 for 56 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 96.97 sec: 9.05100 ( -0.12958 0.13013 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13437e-05 ( -8.8456e-07 8.8456e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.844000 62.196000
120.096000 151.024000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833576 ( -9.16642 1.59341 )
beta : -1.03521 ( -2.390420E-02 2.402711E-02) )
Epeak [keV] : 43.8679 ( -43.7679 9956.13 )
Norm@50keV : 0.140484 ( -6.190857E-02 6730.54 )
------------------------------------------------------------
Chi-Squared = 15.79501 using 59 PHA bins.
Reduced chi-squared = 0.2871820 for 55 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 96.97 sec: 401.118 ( -243.979 1014.08 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000125264 ( -1.36039e-06 1.36049e-06 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 16.872 sec. to 17.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00489 ( -3.739500E-02 3.723979E-02) )
Norm@50keV : 0.215681 ( -4.136443E-03 4.119143E-03) )
------------------------------------------------------------
Chi-Squared = 41.58604 using 59 PHA bins.
Reduced chi-squared = 0.7295796 for 57 degrees of freedom
Null hypothesis probability = 0.938
Photon flux (15-150 keV) in 1.000 sec: 24.8384 ( -0.494 0.4942 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32821e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.872 sec. to 17.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.998399 ( -3.770536E-02 3.753614E-02) )
Epeak [keV] : 9999.11 ( -9999.10 0.893555 )
Norm@50keV : 0.216932 ( -4.143715E-03 4.126728E-03) )
------------------------------------------------------------
Chi-Squared = 41.62492 using 59 PHA bins.
Reduced chi-squared = 0.7433022 for 56 degrees of freedom
Null hypothesis probability = 0.924
Photon flux (15-150 keV) in 1.000 sec: 24.8246 ( -0.4951 0.497 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32905e-06 ( -4.3706e-08 4.3759e-08 ) ergs/cm2
Band function
Time interval is from 16.872 sec. to 17.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.823626 ( -9.17637 1.99225 )
beta : -1.00489 ( -3.728080E-02 3.739518E-02) )
Epeak [keV] : 49.7688 ( -49.6688 9950.23 )
Norm@50keV : 0.363182 ( -0.104555 6.778208E+06) )
------------------------------------------------------------
Chi-Squared = 41.58601 using 59 PHA bins.
Reduced chi-squared = 0.7561092 for 55 degrees of freedom
Null hypothesis probability = 0.909
Photon flux (15-150 keV) in 1.000 sec: 24.8243 ( -0.4948 0.4972 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3296e-06 ( 0 0 ) ergs/cm2
Plot creation:
Wed Mar 19 11:01:40 EDT 2008