batgrbproduct analysis for trigger=348781

batgrbproduct Analysis for Trigger=348781

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 v2.44
    Process Start Time (local time): Thu Apr  9 17:15:51 EDT 2009
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger348781/GCN5_download_cron
======================================================================

  Trigger: 00348781      Segment: 000

  BAT Trigger Time: 260939778.944   [s; MET]
      Trigger Stop: 260939779.968   [s; MET]
               UTC: 2009-04-09T03:16:14.300500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 268.828543063383   Dec: 20.6637347679332  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.61
     Image Trigger?:     NO
     Rate S/N Ratio:     23.7907545067406  [ if not an image trigger ]
     Image S/N Ratio:    6.61

  Flight Position:   [ source = BAT ]
    RA: 268.828543063383   Dec: 20.6637347679332  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 268.825212822548   Dec: 20.6734856931553  [deg; J2000]  
        { 17h 55m 18.1s , +20d 40' 24.5" }
         +/- 3.52900060990272 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.34705283567075 [arcmin] (formal 1-sigma fit error)
    SNR: 5.02063628889317
 
  Angular difference between Flight and Ground position is 0.614200 arcmin
 
  Partial Coding Fraction: 0.3476562    [ 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    -0.012984   0.013713   0.047411   0.095888
           0.015178   0.017633   0.018763   0.023596 [error]
 Peak     -0.012984   0.013713   0.047411   0.095888
           0.015178   0.017633   0.018763   0.023596 [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 4.60e-10 3.70e-09 2.66e-08 1.06e-06 9.76e-08 1.08e-06   erg/cm2
              Error 2.02e-09 6.98e-09 2.21e-08 1.13e-06 7.38e-08 1.15e-06   erg/cm2
Peak flux Power-law 1.39e-02 5.88e-02 2.11e-01 2.64e+00 6.07e-01 2.92e+00   ph/cm2/s
              Error 6.16e-02 1.15e-01 1.93e-01 2.36e+00 5.20e-01 2.28e+00   ph/cm2/s
 
Fluence   Cutoff-PL 4.71e-10 3.78e-09 2.69e-08 1.04e-06 9.84e-08 1.08e-06   erg/cm2
              Error 2.01e-09 6.97e-09 2.37e-08 1.28e-06 7.40e-08 1.29e-06   erg/cm2
Peak flux Cutoff-PL 1.42e-02 5.98e-02 2.13e-01 2.62e+00 6.13e-01 2.90e+00   ph/cm2/s
              Error 6.15e-02 1.15e-01 1.82e-01 2.67e+00 5.20e-01 2.58e+00   ph/cm2/s
 
Fluence        Band 5.27e-11 1.51e-09 1.94e-08 9.51e-07 9.89e-08 1.92e-07   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 1.42e-02 5.97e-02 2.12e-01 2.60e+00 1.85e-01 2.85e+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   -0.833    1.388    -      -           3.00e-03 4.10e-03   87.010 57
CPL  -0.731    1.865    9999.4    0.0      3.39e-03 5.13e-02   87.030 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL   -0.826    1.376    -      -           3.04e-03 4.10e-03   87.690 57
CPL  -3.749    0.000    5114.9    0.0      1.24e-04 0.00e+00   87.610 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

Click here for the BAT GCN circular template

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  268.8252 +20.6735 0.0383   47.3  -11.4       0.1955     5.0  TRIG_00348781       
------------------------------------------
 
Foreground time interval of the image:
  0.000   1.024 (delta_t =   1.024 [sec])
Background time interval of the image:
-60.944 -27.394 (delta_t =  33.550 [sec])
-16.944 -10.944 (delta_t =   6.000 [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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Flight mask-tagged light curves

Caution: Mask-weight map is always using the same on-axis map

Quad-rate summed light curves (from T0-300 to T0+1000)

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    0.000 sec. to    1.024 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.833389     ( -1.34381   1.43224 )
Norm@50keV  : 3.00497E-03    ( -0.00299758   0.00520477 )
------------------------------------------------------------
# Chi-Squared =          87.01 using 59 PHA bins.
# Reduced chi-squared =          1.527 for     57 degrees of freedom 
# Null hypothesis probability =   6.398055e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.604036 ( -0.604036  0.434648 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.76099e-08 ( -9.76099e-08  4.99927e-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: -0.731038     ( -2.40945   1.32082 )
Epeak [keV] : 9999.36      ( -9999.76 -9999.76 )
Norm@50keV  : 3.38969E-03    ( -0.00340418   0.0991362 )
------------------------------------------------------------
# Chi-Squared =          87.03 using 59 PHA bins.
# Reduced chi-squared =          1.554 for     56 degrees of freedom 
# Null hypothesis probability =   4.966306e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.609569 ( -0.609569  0.429061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.83741e-08 ( -9.83741e-08  4.95959e-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       : -0.345543   ( 0.344174   0.344174 )
beta        : 0.840692    ( -1.43788   1.33605 )
Epeak [keV] : 12.3741      ( -12.3684 -12.3684 )
Norm@50keV   : 5.76207E-03    ( 0.822496   -0.00575991 )
------------------------------------------------------------
# Chi-Squared =          87.01 using 59 PHA bins.
# Reduced chi-squared =          1.582 for     55 degrees of freedom 
# Null hypothesis probability =   3.845095e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.184898 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.89496e-08 ( -7.28487e-08  4.85524e-08 ) ergs/cm2

Peak spectrum fit

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: -0.826391     ( -1.33763   1.41472 )
Norm@50keV  : 3.03682E-03    ( -0.00302559   0.0051718 )
------------------------------------------------------------
# Chi-Squared =          87.69 using 59 PHA bins.
# Reduced chi-squared =          1.538 for     57 degrees of freedom 
# Null hypothesis probability =   5.590264e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.607451 ( -0.607451  0.432758 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.81197e-08 ( -9.81197e-08  4.98888e-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: -3.74942     (     )
Epeak [keV] : 5114.87      ( -1001.34 -1001.34 )
Norm@50keV  : 1.23923E-04    (     )
------------------------------------------------------------
# Chi-Squared =          87.61 using 59 PHA bins.
# Reduced chi-squared =          1.565 for     56 degrees of freedom 
# Null hypothesis probability =   4.401472e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.612646 ( -0.612646  0.427474 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.88609e-08 ( -9.88609e-08  4.95137e-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       : -0.228918   ( 0.22828   0.22828 )
beta        : 0.838413    ( -1.42406   1.32657 )
Epeak [keV] : 13.6728      ( -13.6666 -13.6666 )
Norm@50keV   : 5.68410E-03    ( -0.00568212   6520.98 )
------------------------------------------------------------
# Chi-Squared =          87.69 using 59 PHA bins.
# Reduced chi-squared =          1.594 for     55 degrees of freedom 
# Null hypothesis probability =   3.336455e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.184898 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.89496e-08 ( -7.28487e-08  4.85524e-08 ) ergs/cm2

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.833389     ( -1.34381   1.43224 )
Norm@50keV  : 3.00497E-03    ( -0.00299758   0.00520477 )
------------------------------------------------------------
# Chi-Squared =          87.01 using 59 PHA bins.
# Reduced chi-squared =          1.527 for     57 degrees of freedom 
# Null hypothesis probability =   6.398055e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.604036 ( -0.604036  0.434648 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.76099e-08 ( -9.76099e-08  4.99927e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.731038     ( -2.40945   1.32082 )
Epeak [keV] : 9999.36      ( -9999.76 -9999.76 )
Norm@50keV  : 3.38969E-03    ( -0.00340418   0.0991362 )
------------------------------------------------------------
# Chi-Squared =          87.03 using 59 PHA bins.
# Reduced chi-squared =          1.554 for     56 degrees of freedom 
# Null hypothesis probability =   4.966306e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.609569 ( -0.609569  0.429061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.83741e-08 ( -9.83741e-08  4.95959e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.345543   ( 0.344174   0.344174 )
beta        : 0.840692    ( -1.43788   1.33605 )
Epeak [keV] : 12.3741      ( -12.3684 -12.3684 )
Norm@50keV   : 5.76207E-03    ( 0.822496   -0.00575991 )
------------------------------------------------------------
# Chi-Squared =          87.01 using 59 PHA bins.
# Reduced chi-squared =          1.582 for     55 degrees of freedom 
# Null hypothesis probability =   3.845095e-03
 
Photon flux (15-150 keV)    in 1.024 sec: 0.184898 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.89496e-08 ( -7.28487e-08  4.85524e-08 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 3.70419e-09
S(50-100 keV) = 2.65686e-08

T90 vs. Hardness ratio plot

T90                                   = 1.02399998903275 sec.
Hardness ratio (energy fluence ratio) = 7.17258

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = -1.05615
Count Ratio (50-100 keV) / (15-25 keV) = -3.65149

Mask shadow pattern

IMX = 0, IMY = 0

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-60.944000 -27.394000
-16.944000 -10.944000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5514  35.2108    5.2  28.5  -17.8   0.5552   2.2    9.1	Her X-1                       
192.3979  50.3292    2.5  18.7 -179.4   1.1040   4.6 ------	UNKNOWN                       
169.0548  73.5553    2.5  36.2 -137.1   1.5913   4.6 ------	UNKNOWN                       
265.7103  74.7656    2.5  35.9  -96.5   2.3803   4.6 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
0.000000 1.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6918  35.3184    0.0  28.6  -18.1   0.0959   4.4   11.6	Her X-1                       
256.0645  17.4198    2.1  41.3    4.3   0.1751   5.5 ------	UNKNOWN                       
275.9642  12.5797    3.0  57.9  -10.1   0.4558   3.9 ------	UNKNOWN                       
129.8528  46.5218    2.4  58.7 -169.1   0.6336   4.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Tue Feb 16 20:34:38 EST 2010