Gamma-ray Burst 120218A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 18 Feb 12 00:50:17 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     515277,   Seg_Num: 0
  GRB_RA:          319.758d {+21h 19m 02s} (J2000),
                   319.934d {+21h 19m 44s} (current),
                   319.031d {+21h 16m 07s} (1950)
  GRB_DEC:         -25.450d {-25d 27' 00"} (J2000),
                   -25.399d {-25d 23' 55"} (current),
                   -25.662d {-25d 39' 41"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       37474 [cnts]    Image_Peak=452 [image_cnts]
  TRIGGER_DUR:     8.192 [sec] 
  TRIGGER_INDEX:   477     E_range: 25-100 keV
  BKG_INTEN:       248151 [cnts]
  BKG_TIME:        2872.09 SOD {00:47:52.09} UT
  BKG_DUR:         64 [sec]
  GRB_DATE:        15975 TJD;    49 DOY;   12/02/18
  GRB_TIME:        2962.14 SOD {00:49:22.14} UT
  GRB_PHI:         -54.03 [deg]
  GRB_THETA:        48.60 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     27.03 [sigma]
  IMAGE_SIGNIF:    9.67 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +3  +2  +0 -100  +0 -95  +0 
  SUN_POSTN:       330.90d {+22h 03m 37s}  -11.90d {-11d 54' 12"}
  SUN_DIST:         17.01 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
  MOON_POSTN:      281.89d {+18h 47m 33s}  -20.40d {-20d 24' 05"}
  MOON_DIST:        35.29 [deg]
  MOON_ILLUM:      16 [%]
  GAL_COORDS:       22.32,-42.72 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      314.31, -9.34 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 180.10,3.10 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:          GCN/INTEGRAL NOTICE
  NOTICE_DATE:    Sat 18 Feb 12 00:50:22 UT 
  NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
  TRIGGER_NUM:    6470,   Sub_Num: 0
  GRB_INTEN:      9.13 [sigma]
  GRB_TIME:       2940.96 SOD {00:49:00.96} UT
  GRB_DATE:       15975 TJD;    49 DOY;   12/02/18
  COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
  COMMENTS:
  COMMENTS:       NOTE: This SPIACS event is temporally(22.0<100sec) coincident
  +with the SWIFT_BAT event (trignum=515277). 
  COMMENTS:
  COMMENTS:       The SPIACS lightcurve can be found at:
  COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2012-02/2012-02-18T00-49-00.7412-24546-19344-0.lc 
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 18 Feb 12 00:53:17 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     515277,   Seg_Num: 0
  GRB_RA:          319.758d {+21h 19m 02s} (J2000),
                   319.934d {+21h 19m 44s} (current),
                   319.031d {+21h 16m 07s} (1950)
  GRB_DEC:         -25.450d {-25d 27' 00"} (J2000),
                   -25.399d {-25d 23' 55"} (current),
                   -25.662d {-25d 39' 41"} (1950)
  GRB_DATE:        15975 TJD;    49 DOY;   12/02/18
  GRB_TIME:        2962.14 SOD {00:49:22.14} UT
  TRIGGER_INDEX:   477
  GRB_PHI:         -54.03 [deg]
  GRB_THETA:        48.60 [deg]
  DELTA_TIME:      -44.00 [sec]
  TRIGGER_DUR:     8.192 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     27.03 [sigma]
  IMAGE_SIGNIF:    9.67 [sigma]
  LC_URL:          sw00515277000msb.lc
  SUN_POSTN:       330.91d {+22h 03m 38s}  -11.90d {-11d 54' 10"}
  SUN_DIST:         17.02 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
  MOON_POSTN:      281.92d {+18h 47m 40s}  -20.40d {-20d 23' 49"}
  MOON_DIST:        35.26 [deg]
  MOON_ILLUM:      16 [%]
  GAL_COORDS:       22.32,-42.72 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      314.31, -9.34 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 180.10,3.10 [deg].  
  

  
• GCN Circular #12962
  C. A. Wolf (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), D. M. Palmer (LANL), C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/PSU), C. A. Swenson (PSU), T. N. Ukwatta (MSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
  At 00:49:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120218A (trigger=515277). Swift did not slew due to a Sun constraint. The BAT on-board calculated location is RA, Dec 319.758, -25.450, which is

     RA(J2000) = 21h 19m 02s
     Dec(J2000) = -25d 27' 00"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 30 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~2 sec after the trigger.
  Due to a Sun observing constraint, Swift cannot slew to the BAT position until 19:14 UT on 2012 March 20. There will thus be no XRT or UVOT data for this trigger before this time.
  Burst Advocate for this burst is C. A. Wolf (cwolf AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN Circular #12963
  S. D. Barthelmy (GSFC), T. Sakamoto (GSFC/UMBC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU), C. A. Wolf (PSU) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+303 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120218A (trigger #515277) (Wolf, et al., GCN Circ. 12962). The BAT ground-calculated position is RA, Dec = 319.7641, -25.4626 deg which is

     RA(J2000)  =  21h 19m 03.4s
     Dec(J2000) = -25d 27' 45.4"
  

  with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 4%.
  The mask-weighted light curve shows 3 or 4 overlapping peaks starting at ~T-28 sec, with the highest peak is at ~T+3 sec, and ending at ~T+15 sec. T90 (15-350 keV) is 27.5 +- 1.0 sec (estimated error including systematics).
  The time-averaged spectrum from T-20.6 to T+8.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.75 +- 0.11. The fluence in the 15-150 keV band is 5.3 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.33 sec in the 15-150 keV band is 9.1 +- 1.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/515277/BA/
• GCN Report 376.1
  GCN_Report 376.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_376_1.pdf by C.A. Wolf at PSU titled: "Swift Observations of GRB 120218A"