GRB150301A

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Mar 14 16:10:07 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger632995
======================================================================

  Trigger: 00632995      Segment: 000

  BAT Trigger Time: 446864681.884   [s; MET]
      Trigger Stop: 446864681.916   [s; MET]
               UTC: 2015-03-01T01:04:28.634980    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 244.285852544314   Dec: -48.6970222502195  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.43
     Image Trigger?:     NO
     Rate S/N Ratio:     43.5201102939779  [ if not an image trigger ]
     Image S/N Ratio:    13.43

  Analysis Position:   [ source = BAT ]
    RA: 244.285852544314   Dec: -48.6970222502195  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 244.280161468935   Dec: -48.7319304348823  [deg; J2000]  
        { 16h 17m 07.2s , -48d 43' 54.9" }
         +/- 1.86527467161496 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.807288209779148 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4836895925704
 
  Angular difference between the analysis and refined position is 2.106574 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 0.483999967575073 +/- 0.144055479289884
        Measured from: 0
                   to: 0.483999967575073     [s; relative to TRIGTIME]
     T50: 0.179999947547913 +/- 0.116068941971857
        Measured from: 0.00800001621246338
                   to: 0.187999963760376     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.220000028610229     
                   to: 0.779999971389771     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.560000002384186     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.036667   0.042247   0.032243   0.009608
           0.005555   0.005310   0.004342   0.003608 [error]
 Peak      0.039583   0.042439   0.029779   0.011110
           0.007154   0.006623   0.005447   0.004677 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.560    0.000    0.560
T90     0.484    0.000    0.484
T50     0.180    0.008    0.188
Peak    1.000   -0.220    0.780
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.440    -0.231      0.233       -           -               -         1.37e-02     -1.73e-03          1.73e-03      53.930   57
CPL     -1.436    -0.233      0.623     9999.350    -9999.350      -9999.350      1.38e-02     -1.07e-02          1.39e-02      53.940   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.607     -0.294     0.289       -           -               -         7.50e-03     -1.26e-03          1.24e-03      46.880   57
CPL     -1.512     -1.278     1.098      240.488    -240.488      -240.488      8.43e-03     -2.18e-03          2.32e-02      46.930   56
 
 
=== 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         PL   9.27e-09  1.77e-08  2.60e-08  8.23e-08  7.36e-08  1.35e-07   erg/cm2
      90%_error_low -2.08e-09 -2.42e-09 -4.27e-09 -2.63e-08 -1.02e-08 -2.98e-08   erg/cm2
      90%_error_hi   2.20e-09  2.38e-09  4.22e-09  3.42e-08  1.03e-08  3.62e-08   erg/cm2
Peak flux       PL   3.42e-01  3.23e-01  2.12e-01  2.16e-01  9.66e-01  1.09e+00   ph/cm2/s
      90%_error_low -8.91e-02 -5.37e-02 -4.60e-02 -8.24e-02 -1.55e-01 -1.73e-01   ph/cm2/s
      90%_error_hi   9.53e-02  5.30e-02  4.56e-02  1.11e-01  1.55e-01  1.74e-01   ph/cm2/s
 
Fluence        CPL   9.27e-09  1.75e-08  2.60e-08  8.19e-08  7.46e-08  1.34e-07   erg/cm2
      90%_error_low    N/A       N/A       N/A       N/A       N/A    -5.10e-08   erg/cm2
      90%_error_hi     N/A       N/A       N/A       N/A       N/A     1.62e-08   erg/cm2
Peak flux      CPL   3.43e-01  3.23e-01  2.12e-01  2.18e-01  9.66e-01  1.10e+00   ph/cm2/s
      90%_error_low -1.02e-01 -5.25e-02 -4.59e-02 -1.38e-01 -1.61e-01 -2.52e-01   ph/cm2/s
      90%_error_hi   5.34e-02  6.54e-02  4.78e-02  1.07e-01  1.55e-01  1.68e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  244.2802   -48.7319   0.0154    16.1008    21.7106         0.1239649     12.484 TRIG_00632995                 
 
Foreground time interval of the image:
  0.000   0.560 (delta_t =   0.560 [sec])
Background time interval of the image:
-239.884   0.000 (delta_t = 239.884 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM

Power-law model

Time interval is from    0.000 sec. to    0.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44013     ( -0.23122   0.23317 )
Norm@50keV  : 1.37091E-02    ( -0.00173368   0.00172683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.93 using 59 PHA bins.
# Reduced chi-squared =         0.9461 for     57 degrees of freedom 
# Null hypothesis probability =   5.909914e-01
 
Photon flux (15-150 keV)    in 0.56 sec: 1.68540 ( -0.21791  0.21873 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.36086e-08 ( -1.02307e-08  1.03486e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43637     ( -0.233244   0.622983 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 1.37556E-02    ( -0.0107299   0.0139469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.94 using 59 PHA bins.
# Reduced chi-squared =         0.9632 for     56 degrees of freedom 
# Null hypothesis probability =   5.533389e-01
 
Photon flux (15-150 keV)    in 0.56 sec: 1.14049 ( -0.367971  0.30424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.46306e-08 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.220 sec. to    0.780 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60652     ( -0.293618   0.2892 )
Norm@50keV  : 7.49984E-03    ( -0.00126236   0.00124054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.88 using 59 PHA bins.
# Reduced chi-squared =         0.8225 for     57 degrees of freedom 
# Null hypothesis probability =   8.281827e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.965752 ( -0.154773  0.155238 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.00939e-08 ( -1.25393e-08  1.27919e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.220 sec. to    0.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60468     ( -1.26763   1.10812 )
Epeak [keV] : 9996.48      ( -9997.58 -9997.58 )
Norm@50keV  : 7.51742E-03    ( -0.00127027   0.0240849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.88 using 59 PHA bins.
# Reduced chi-squared =         0.8372 for     56 degrees of freedom 
# Null hypothesis probability =   8.021939e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.966486 ( -0.160815  0.154594 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.59484e-08 ( -1.48921e-08  1.0857e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.484 sec.
Hardness ratio (energy fluence ratio) = 1.47417776593

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 2.6933635e-08
S(50-150 keV) = 4.667549e-08

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

 IMX = 2.681746765815812E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.884000 0.000000

# RAcent #  [deg] 186.8257 -62.5685 244.9951 -15.6438 255.9964 -37.8422 256.4931 -36.4027 262.9192 -24.7252 264.5326 -44.5092 268.3444  -1.4855 270.2649 -25.2125 270.3191 -25.7116 274.0064 -14.0359 275.9979 -30.4071 285.0812 -24.9359 263.1775 -33.6930 270.9836 -34.3155 282.6026 -69.4234 312.9517 -46.2110

Pre-slew

 Time interval of the image: 0.000000 0.560000

# RAcent #  [deg] 186.6559 -62.8316 245.0919 -15.8023 255.9178 -37.9887 256.6052 -36.2875 262.8606 -24.8009 264.5506 -44.5974 268.3668  -1.3034 270.2029 -25.0460 270.3485 -25.8381 274.0741 -14.1837 276.0894 -30.2729 284.8933 -24.7970 263.1614 -33.9911 244.2801 -48.7319 258.7123 -17.8667 10.0730 -84.0385

Post-slew

 Time interval of the image: 47.216600 179.016600

# RAcent #  [deg] 170.1116 -60.8051 186.8127 -62.8824 244.9678 -15.6362 255.9832 -37.8308 256.3792 -36.4182 262.9499 -24.7019 264.7075 -44.4470 268.3963  -1.4530 270.4098 -24.9347 270.2405 -25.7896 274.0046 -14.0375 275.9371 -30.4097 285.1472 -24.7924 262.8264 -33.9817 191.5128 -37.5391 157.9671 -55.4762 227.4586  -2.7410 122.8623 -69.2730 120.5436 -73.1069

IMY = -1.067771607370521E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.9 49.8 27.5 1.3143 1.5 13.0 GX 301-2 0.3 21.7 143.9 10.3645 42.0 0.9 Sco X-1 0.7 2.8 -9.1 3.8330 17.8 0.5 4U 1700-377 1.6 1.4 -28.0 1.5642 7.1 3.0 GX 349+2 3.2 12.0 -154.4 0.8676 3.7 5.0 GX 1+4 8.1 11.5 -39.4 -0.3310 -1.4 9.7 4U 1735-44 12.8 35.6 -165.0 0.2814 0.9 2.4 SW J1753.5-0127 7.9 15.9 -131.4 0.3754 1.6 8.1 GX 5-1 5.5 15.6 -129.8 0.6163 2.5 2.1 GRS 1758-258 2.8 26.6 -144.4 1.0604 4.0 0.0 GX 17+2 4.9 17.5 -106.6 0.5931 2.4 4.5 H1820-303 14.4 27.1 -110.7 0.2785 0.8 2.6 HT1900.1-2455 0.0 6.2 -107.7 0.5929 2.6 12.7 GX 354-0 2.2 12.4 -96.0 1.2220 5.2 ------ UNKNOWN 2.7 37.4 -21.9 1.2566 4.3 ------ UNKNOWN 3.2 43.7 -64.0 4.3807 3.6 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 3.4 49.9 27.1 -0.1313 -3.4 3.7 GX 301-2 9.0 21.6 143.9 -0.0132 -1.3 11.7 Sco X-1 3.6 2.9 -7.7 -0.0295 -3.2 9.3 4U 1700-377 5.3 1.4 -33.3 -0.0202 -2.2 11.5 GX 349+2 12.5 11.9 -154.4 0.0086 0.9 8.7 GX 1+4 8.2 11.6 -39.1 0.0127 1.4 12.1 4U 1735-44 3.9 35.7 -165.0 0.0344 2.9 8.9 SW J1753.5-0127 18.7 15.9 -131.9 -0.0058 -0.6 4.8 GX 5-1 9.8 15.5 -129.4 0.0111 1.2 6.2 GRS 1758-258 5.2 26.6 -144.1 0.0237 2.2 9.7 GX 17+2 7.4 17.7 -106.9 -0.0158 -1.6 10.2 H1820-303 246.6 27.1 -111.2 0.0006 0.0 10.7 HT1900.1-2455 0.0 6.1 -105.0 0.0187 2.0 12.7 GX 354-0 0.9 16.1 21.7 0.1240 12.5 ------ UNKNOWN 2.3 17.4 -177.7 0.0475 5.0 ------ UNKNOWN 2.3 57.5 -13.2 0.2163 5.1 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 28.8 42.0 34.2 0.1393 0.4 12.5 Cen X-3 3.6 33.9 33.2 0.7333 3.2 8.0 GX 301-2 0.4 33.1 170.7 5.7362 28.9 0.7 Sco X-1 1.9 13.8 -148.3 0.9275 6.1 0.8 4U 1700-377 3.6 15.1 -150.3 0.4977 3.2 2.7 GX 349+2 5.3 28.1 -152.4 0.3327 2.2 4.2 GX 1+4 24.6 14.6 -109.7 -0.0702 -0.5 1.5 4U 1735-44 81.2 51.6 -159.0 0.0561 0.1 1.7 SW J1753.5-0127 0.0 31.3 -140.3 0.7171 3.7 11.0 GX 5-1 6.7 30.5 -139.6 0.3247 1.7 4.4 GRS 1758-258 22.3 42.4 -145.0 0.1430 0.5 0.1 GX 17+2 6.1 30.1 -126.1 0.3967 1.9 2.6 H1820-303 5.0 39.8 -122.4 0.7367 2.3 9.8 HT1900.1-2455 0.0 20.1 -140.6 0.3015 2.2 12.0 GX 354-0 3.5 39.3 75.8 2.2112 3.3 ------ UNKNOWN 3.2 50.0 37.2 3.0416 3.6 ------ UNKNOWN 3.1 48.2 146.7 2.3335 3.8 ------ UNKNOWN 2.7 54.5 11.4 3.1651 4.2 ------ UNKNOWN 2.2 52.2 7.4 2.5600 5.4 ------ UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

Mask shadow pattern

Spacecraft aspect plot

Bright

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve