Burst 110319A

TITLE:           GCN/SWIFT NOTICE
                           NOTICE_DATE:     Sat 19 Mar 11 02:16:58 UT
                           NOTICE_TYPE:     Swift-BAT GRB Position
                           TRIGGER_NUM:     449578,   Seg_Num: 0
                           GRB_RA:          356.401d {+23h 45m 36s} (J2000),
                           356.553d {+23h 46m 13s} (current),
                           355.717d {+23h 42m 52s} (1950)
                           GRB_DEC:         -66.017d {-66d 01' 01"} (J2000),
                           -65.955d {-65d 57' 16"} (current),
                           -66.295d {-66d 17' 40"} (1950)
                           GRB_ERROR:       3.00 [arcmin radius, statistical only]
                           GRB_INTEN:       4261 [cnts]    Image_Peak=187 [image_cnts]
                           TRIGGER_DUR:     1.024 [sec] 
                           TRIGGER_INDEX:   146     E_range: 25-100 keV
                           BKG_INTEN:       27328 [cnts]
                           BKG_TIME:        8185.23 SOD {02:16:25.23} UT
                           BKG_DUR:         8 [sec]
                           GRB_DATE:        15639 TJD;    78 DOY;   11/03/19
                           GRB_TIME:        8201.61 SOD {02:16:41.61} UT
                           GRB_PHI:         -122.46 [deg]
                           GRB_THETA:         9.16 [deg]
                           SOLN_STATUS:     0x3
                           RATE_SIGNIF:     12.16 [sigma]
                           IMAGE_SIGNIF:    7.06 [sigma]
                           MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 -41  +0 
                           SUN_POSTN:       358.28d {+23h 53m 08s}   -0.74d {-00d 44' 35"}
                           SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
                           MOON_POSTN:      167.83d {+11h 11m 19s}   -0.10d {-00d 05' 46"}
                           MOON_DIST:       113.65 [deg]
                           MOON_ILLUM:      99 [%]
                           GAL_COORDS:      313.20,-49.78 [deg] galactic lon,lat of the burst (or transient)
                           ECL_COORDS:      316.36,-55.91 [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 = 221.56,-16.28 [deg].  
                            

 

Burst 110223B

  t Burst Alert Telescope (BAT) triggered and located GRB 110223B (trigger=446677). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 150.276, -68.329 which is

   RA(J2000) = 10h 01m 06s
                              Dec(J2000) = -68d 19' 44"
                           

with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 5 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 21:27:00.0 UT, 72.0 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 150.2339, -68.3019 which is equivalent to:

   RA(J2000)  = 10h 00m 56.15s
                              Dec(J2000) = -68d 18' 06.7"
                           

with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 112 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.29 x 10^21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle.

 Burst 110213A

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 13 Feb 11 05:17:27 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     319267033
GRB_RA:           46.033d {+03h 04m 08s} (J2000),
                  46.228d {+03h 04m 55s} (current),
                  45.162d {+03h 00m 39s} (1950)
GRB_DEC:         +49.333d {+49d 19' 60"} (J2000),
                 +49.376d {+49d 22' 34"} (current),
                 +49.138d {+49d 08' 19"} (1950)
GRB_ERROR:       28.88 [deg radius, statistical plus systematic]
GRB_INTEN:       72 [cnts/sec]
DATA_SIGNIF:     5.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15605 TJD;    44 DOY;   11/02/13
GRB_TIME:        19031.27 SOD {05:17:11.27} UT
GRB_PHI:         298.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.45
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       326.45d {+21h 45m 49s}  -13.47d {-13d 28' 21"}
SUN_DIST:         93.69 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:       75.17d {+05h 00m 40s}  +24.00d {+23d 59' 52"}
MOON_DIST:        33.98 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      144.04, -8.02 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       58.28, 30.62 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates. 
COMMENTS:        This trigger occurred at longitude,latitude = 124.60,20.80 [deg].