batgrbproduct Analysis for Trigger=295779
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): Fri Dec 14 22:25:50 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger295779/GCN5_download_cron
======================================================================
Trigger: 00295779 Segment: 000
BAT Trigger Time: 215632428.928 [s; MET]
Trigger Stop: 215632430.976 [s; MET]
UTC: 2007-11-01T17:53:46.595880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.1935449819936 Dec: 62.4734168223862 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.51
Image Trigger?: NO
Rate S/N Ratio: 9.2736184954957 [ if not an image trigger ]
Image S/N Ratio: 6.51
Flight Position: [ source = BAT ]
RA: 48.1935449819936 Dec: 62.4734168223862 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.1848856292839 Dec: 62.5307468506475 [deg; J2000]
{ 03h 12m 44.4s , +62d 31' 50.7" }
+/- 2.33334544353073 [arcmin] (estimated 90% radius based on SNR)
+/- 1.39463288648516 [arcmin] (formal 1-sigma fit error)
SNR: 9.0663825131069
RA = 3h 12m 44.4s (48.184886 deg.)
Dec = 62d 31' 51" (62.530747 deg.)
Angular difference between Flight and Ground position is 3.448156 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 6.60799998044968 +/- 2.23435000749602
Measured from: -1.22400000691414
to: 5.38399997353554 [s; relative to TRIGTIME]
T50: 2.63999998569489 +/- 2.18849354196162
Measured from: 0.183999985456467
to: 2.82399997115135 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.212000012397766
to: 0.787999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.59200000762939
to: 5.65599998831749 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.070737 0.071008 0.020989 0.033498
0.013455 0.013508 0.012210 0.011471 [error]
Peak 0.022001 0.027148 0.011414 0.012805
0.005211 0.005262 0.004633 0.004168 [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 2.23e-08 2.64e-08 2.27e-08 3.31e-08 8.32e-08 1.04e-07 erg/cm2
Error 6.17e-09 6.37e-09 1.09e-08 3.18e-08 2.45e-08 4.55e-08 erg/cm2
Peak flux Power-law 1.70e-01 1.62e-01 1.08e-01 1.11e-01 4.86e-01 5.52e-01 ph/cm2/s
Error 6.37e-02 4.02e-02 3.64e-02 7.51e-02 1.19e-01 1.40e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.53e-01 1.94e-01 1.01e-01 1.79e-02 4.63e-01 4.66e-01 ph/cm2/s
Error 7.21e-02 6.49e-02 5.33e-02 8.82e-02 1.24e-01 1.59e-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 1.53e-01 1.96e-01 9.99e-02 6.92e-02 4.82e-01 5.17e-01 ph/cm2/s
Error 7.55e-02 4.61e-02 3.61e-02 6.84e-02 1.20e-01 1.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.220 0.493 - - 1.22e-03 4.23e-04 57.062 57
CPL 2.221 0.495 9999.2 0.0 1.22e-03 0.00e+00 57.062 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.591 0.420 - - 3.79e-03 1.01e-03 61.329 57
CPL 0.148 2.573 51.8 5000.0 2.71e-02 6.93e-01 60.199 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 7.248 -1.592 5.656
T90 6.608 -1.224 5.384
T50 2.640 0.184 2.824
Peak 1.000 -0.212 0.788
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.1849 +62.5307 0.0211 12.8 -126.1 0.2242 9.1 TRIG_00295779
------------------------------------------
Foreground time interval of the image:
-1.592 5.656 (delta_t = 7.248 [sec])
Background time interval of the image:
-239.928 -1.592 (delta_t = 238.336 [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 -1.592 sec. to 5.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21971 ( -0.448900 0.537674 )
Norm@50keV : 1.217271E-03 ( -4.325997E-04 4.140780E-04) )
------------------------------------------------------------
Chi-Squared = 57.06195 using 59 PHA bins.
Reduced chi-squared = 1.001087 for 57 degrees of freedom
Null hypothesis probability = 0.473
Photon flux (15-150 keV) in 7.248 sec: 0.203632 ( -0.043649 0.043686 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32223e-08 ( -2.35735e-08 2.55093e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.592 sec. to 5.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22056 ( -0.450700 0.539342 )
Epeak [keV] : 9999.19 ( )
Norm@50keV : 1.215940E-03 ( )
------------------------------------------------------------
Chi-Squared = 57.06187 using 59 PHA bins.
Reduced chi-squared = 1.018962 for 56 degrees of freedom
Null hypothesis probability = 0.435
Photon flux (15-150 keV) in 7.248 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.592 sec. to 5.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49736 ( -7.86264 7.13736 )
beta : -2.28824 ( -0.537552 0.448908 )
Epeak [keV] : 19.5784 ( -18.8179 9981.08 )
Norm@50keV : 3.955723E-03 ( -5.875624E-02 5.630764E-02) )
------------------------------------------------------------
Chi-Squared = 57.17038 using 59 PHA bins.
Reduced chi-squared = 1.039461 for 55 degrees of freedom
Null hypothesis probability = 0.394
Photon flux (15-150 keV) in 7.248 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 -0.216 sec. to 0.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59102 ( -0.413153 0.426204 )
Norm@50keV : 3.792585E-03 ( -1.023173E-03 9.957855E-04) )
------------------------------------------------------------
Chi-Squared = 61.32933 using 59 PHA bins.
Reduced chi-squared = 1.075953 for 57 degrees of freedom
Null hypothesis probability = 0.324
Photon flux (15-150 keV) in 1.008 sec: 0.485990 ( -0.11858 0.118639 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57854e-08 ( -1.01094e-08 1.05448e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.216 sec. to 0.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.148417 ( -3.14842 1.99813 )
Epeak [keV] : 51.7645 ( -51.7545 9948.24 )
Norm@50keV : 2.713422E-02 ( -2.713422E-02 1.35787 )
------------------------------------------------------------
Chi-Squared = 60.19911 using 59 PHA bins.
Reduced chi-squared = 1.074984 for 56 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 1.008 sec: 0.463375 ( -0.122718 0.1247 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98615e-08 ( -1.0405e-08 1.39199e-08 ) ergs/cm2
Band function
Time interval is from -0.216 sec. to 0.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.359508 ( -11.7195 3.28049 )
beta : -2.33539 ( -7.89497 0.758443 )
Epeak [keV] : 44.5765 ( -36.7090 822.586 )
Norm@50keV : 6.111067E-02 ( -94.0238 25.3424 )
------------------------------------------------------------
Chi-Squared = 59.43937 using 59 PHA bins.
Reduced chi-squared = 1.080716 for 55 degrees of freedom
Null hypothesis probability = 0.317
Photon flux (15-150 keV) in 1.008 sec: 0.481604 ( -0.120325 0.119052 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20351e-08 ( -5.4938e-09 1.20148e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 22:55:40 EST 2007