batgrbproduct Analysis for Trigger=307309
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): Sun Mar 23 06:43:48 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger307309/GCN5_download_cron
======================================================================
Trigger: 00307309 Segment: 000
BAT Trigger Time: 227891306.048 [s; MET]
Trigger Stop: 227891307.072 [s; MET]
UTC: 2008-03-22T15:08:23.386180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 52.0419672502793 Dec: -21.7046023276043 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.87
Image Trigger?: NO
Rate S/N Ratio: 28.5131548587665 [ if not an image trigger ]
Image S/N Ratio: 5.87
Flight Position: [ source = BAT ]
RA: 52.0419672502793 Dec: -21.7046023276043 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 52.0407512649642 Dec: -21.7646934282855 [deg; J2000]
{ 03h 28m 09.8s , -21d 45' 52.9" }
+/- 4.43848753048208 [arcmin] (estimated 90% radius based on SNR)
+/- 2.60212167678669 [arcmin] (formal 1-sigma fit error)
SNR: 3.61823645967496
RA = 3h 28m 9.8s (52.040751 deg.)
Dec = -21d 45' 53" (-21.764693 deg.)
Angular difference between Flight and Ground position is 3.606103 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004372 0.005494 0.033199 0.026380
0.007556 0.008586 0.008923 0.010778 [error]
Peak 0.004372 0.005494 0.033199 0.026380
0.007556 0.008586 0.008923 0.010778 [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 1.03e-09 4.59e-09 1.74e-08 2.39e-07 5.09e-08 2.57e-07 erg/cm2
Error 1.56e-09 4.49e-09 1.26e-08 2.15e-07 2.20e-08 2.57e-07 erg/cm2
Peak flux Power-law 3.15e-02 7.50e-02 1.42e-01 6.52e-01 3.84e-01 8.99e-01 ph/cm2/s
Error 4.84e-02 7.50e-02 1.04e-01 6.81e-01 1.89e-01 6.34e-01 ph/cm2/s
Fluence Cutoff-PL 3.00e-10 3.70e-09 2.25e-08 5.47e-08 5.28e-08 9.35e-08 erg/cm2
Error 1.18e-09 2.97e-09 1.05e-08 2.28e-07 1.71e-08 2.32e-07 erg/cm2
Peak flux Cutoff-PL 8.93e-03 5.84e-02 1.83e-01 2.18e-01 3.80e-01 4.68e-01 ph/cm2/s
Error 2.06e-02 5.73e-02 8.81e-02 5.68e-01 1.62e-01 5.55e-01 ph/cm2/s
Fluence Band 1.70e-10 3.21e-09 2.40e-08 4.10e-08 5.25e-08 7.04e-08 erg/cm2
Error 6.56e-10 7.84e-09 4.44e-08 1.67e-08 4.94e-08 0.00e+00 erg/cm2
Peak flux Band 5.25e-03 4.94e-02 1.89e-01 1.94e-01 3.73e-01 4.37e-01 ph/cm2/s
Error 5.04e-03 6.13e-02 6.68e-02 3.21e-01 1.53e-01 3.71e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.080 1.801 - - 2.92e-03 2.45e-03 59.010 57
CPL 0.063 1.045 9995.9 0.0 2.96e-03 0.00e+00 58.996 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.080 1.801 - - 2.92e-03 2.45e-03 59.010 57
CPL 0.063 1.045 9995.9 0.0 2.96e-03 0.00e+00 58.996 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
52.0408 -21.7647 0.0534 38.7 -7.6 0.0647 3.6 TRIG_00307309
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.048 -52.231 (delta_t = 7.817 [sec])
-51.048 -10.048 (delta_t = 41.000 [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: 7.964298E-02 ( -2.76301 0.838376 )
Norm@50keV : 2.924575E-03 ( -2.924575E-03 1.968069E-03) )
------------------------------------------------------------
Chi-Squared = 59.01019 using 59 PHA bins.
Reduced chi-squared = 1.035267 for 57 degrees of freedom
Null hypothesis probability = 0.402
Photon flux (15-150 keV) in 1.024 sec: 0.384330 ( -0.183284 0.194783 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08938e-08 ( -2.19501e-08 2.19551e-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: 6.304731E-02 ( -1.24252 0.846762 )
Epeak [keV] : 9995.93 ( )
Norm@50keV : 2.955322E-03 ( )
------------------------------------------------------------
Chi-Squared = 58.99626 using 59 PHA bins.
Reduced chi-squared = 1.053505 for 56 degrees of freedom
Null hypothesis probability = 0.367
Photon flux (15-150 keV) in 1.024 sec: 0.380259 ( -0.159512 0.164769 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2803e-08 ( -2.25126e-08 1.16323e-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 : -0.735838 ( -9.26416 5.73584 )
beta : -7.887343E-02 ( -0.839158 3.30259 )
Epeak [keV] : 18.8031 ( -18.7031 9981.20 )
Norm@50keV : 4.067118E-03 ( -4.067118E-03 21398.3 )
------------------------------------------------------------
Chi-Squared = 59.01019 using 59 PHA bins.
Reduced chi-squared = 1.072913 for 55 degrees of freedom
Null hypothesis probability = 0.331
Photon flux (15-150 keV) in 1.024 sec: 0.372868 ( -0.153464 0.152172 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24657e-08 ( -2.15438e-08 1.1903e-08 ) 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: 7.964298E-02 ( -2.76301 0.838376 )
Norm@50keV : 2.924575E-03 ( -2.924575E-03 1.968069E-03) )
------------------------------------------------------------
Chi-Squared = 59.01019 using 59 PHA bins.
Reduced chi-squared = 1.035267 for 57 degrees of freedom
Null hypothesis probability = 0.402
Photon flux (15-150 keV) in 1.024 sec: 0.384330 ( -0.183284 0.194783 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08938e-08 ( -2.19501e-08 2.19551e-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: 6.304731E-02 ( -1.24252 0.846762 )
Epeak [keV] : 9995.93 ( )
Norm@50keV : 2.955322E-03 ( )
------------------------------------------------------------
Chi-Squared = 58.99626 using 59 PHA bins.
Reduced chi-squared = 1.053505 for 56 degrees of freedom
Null hypothesis probability = 0.367
Photon flux (15-150 keV) in 1.024 sec: 0.380259 ( -0.159512 0.164769 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2803e-08 ( -2.25126e-08 1.16323e-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 : -0.735838 ( -9.26416 5.73584 )
beta : -7.887343E-02 ( -0.839158 2.69096 )
Epeak [keV] : 18.8031 ( -18.7031 9981.20 )
Norm@50keV : 4.067118E-03 ( -4.067118E-03 21398.3 )
------------------------------------------------------------
Chi-Squared = 59.01019 using 59 PHA bins.
Reduced chi-squared = 1.072913 for 55 degrees of freedom
Null hypothesis probability = 0.331
Photon flux (15-150 keV) in 1.024 sec: 0.372868 ( -0.153464 0.152172 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24657e-08 ( -2.15438e-08 1.1903e-08 ) ergs/cm2
Plot creation:
Sun Mar 23 06:53:54 EDT 2008