////////////////////////////////////////////////////////////////////// TITLE: GCN/SWIFT NOTICE NOTICE_DATE: Sat 30 Apr 05 13:31:18 UT NOTICE_TYPE: Swift-BAT GRB Position TRIGGER_NUM: 115881, Seg_Num: 0 GRB_RA: 328.684d {+21h 54m 44s} (J2000), 328.736d {+21h 54m 57s} (current), 328.204d {+21h 52m 49s} (1950) GRB_DEC: +47.795d {+47d 47' 44"} (J2000), +47.821d {+47d 49' 15"} (current), +47.558d {+47d 33' 30"} (1950) GRB_ERROR: 4.00 [arcmin radius, statistical only] GRB_INTEN: 122857 [cnts] Peak=947 [cnts/sec] TRIGGER_DUR: 26.880 [sec] TRIGGER_INDEX: 493 E_range: 50-350 keV BKG_INTEN: 251894 [cnts] BKG_TIME: 48464.00 SOD {13:27:44.00} UT BKG_DUR: 64 [sec] GRB_DATE: 13490 TJD; 120 DOY; 05/04/30 GRB_TIME: 48575.21 SOD {13:29:35.21} UT GRB_PHI: -23.22 [deg] GRB_THETA: 8.37 [deg] SOLN_STATUS: 0x83 RATE_SIGNIF: 13.37 [sigma] IMAGE_SIGNIF: 6.00 [sigma] MERIT_PARAMS: +1 +0 +0 +5 +3 -4 +0 +1 -42 +1 SUN_POSTN: 37.89d {+02h 31m 33s} +14.91d {+14d 54' 32"} SUN_DIST: 65.07 [deg] MOON_POSTN: 304.30d {+20h 17m 13s} -25.07d {-25d 04' 15"} MOON_DIST: 76.13 [deg] MOON_ILLUM: 58 [%] GAL_COORDS: 94.89, -5.22 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 357.44, 54.94 [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: Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection. ////////////////////////////////////////////////////////////////////// TITLE: GCN/SWIFT NOTICE NOTICE_DATE: Sat 30 Apr 05 13:32:29 UT NOTICE_TYPE: Swift-XRT Position TRIGGER_NUM: 115881, Seg_Num: 0 GRB_RA: 328.9447d {+21h 55m 47s} (J2000), 328.9961d {+21h 55m 59s} (current), 328.4626d {+21h 53m 51s} (1950) GRB_DEC: +47.7309d {+47d 43' 51"} (J2000), +47.7563d {+47d 45' 23"} (current), +47.4930d {+47d 29' 35"} (1950) GRB_ERROR: 5.8 [arcsec radius, statistical plus systematic] GRB_INTEN: 13706.37 [arb] GRB_SIGNIF: 11.91 [sigma] GRB_DATE: 13490 TJD; 120 DOY; 05/04/30 GRB_TIME: 48719.21 SOD {13:31:59.21} UT TAM[0-3]: 327.62 237.22 261.34 242.33 AMPLIFIER: 2 WAVEFORM: 135 SUN_POSTN: 37.89d {+02h 31m 33s} +14.91d {+14d 54' 34"} SUN_DIST: 64.89 [deg] MOON_POSTN: 304.33d {+20h 17m 19s} -25.07d {-25d 03' 55"} MOON_DIST: 76.13 [deg] MOON_ILLUM: 58 [%] GAL_COORDS: 94.99, -5.38 [deg] galactic lon,lat of the burst ECL_COORDS: 357.62, 54.78 [deg] ecliptic lon,lat of the burst COMMENTS: SWIFT-XRT Coordinates. COMMENTS: WARNING: XRT alignment calibration is on-going, and there may be COMMENTS: residual systematic offsets of several arcseconds not accounted for yet COMMENTS: by our on-board position determination algorithm. We have increased COMMENTS: the estimated error circle radius to take this into account. COMMENTS: The 'object' found for this position is very likely a cosmic ray hit in the CCD; not a burst afterglow. ////////////////////////////////////////////////////////////////////// TITLE: GCN/SWIFT NOTICE NOTICE_DATE: Sat 30 Apr 05 17:49:20 UT NOTICE_TYPE: Swift-BAT GRB Position RETRACTION TRIGGER_NUM: 115881, Seg_Num: 0 GRB_RA: 328.684d {+21h 54m 44s} (J2000), 328.735d {+21h 54m 56s} (current), 328.203d {+21h 52m 49s} (1950) GRB_DEC: +47.795d {+47d 47' 42"} (J2000), +47.820d {+47d 49' 13"} (current), +47.558d {+47d 33' 28"} (1950) GRB_ERROR: 4.00 [arcmin radius, statistical only] GRB_INTEN: 122857 [cnts] Peak=947 [cnts/sec] TRIGGER_DUR: 26.876 [sec] TRIGGER_INDEX: 493 E_range: 50-350 keV BKG_INTEN: 251894 [cnts] BKG_TIME: 48464.00 SOD {13:27:44.00} UT BKG_DUR: 64 [sec] GRB_DATE: 13490 TJD; 120 DOY; 05/04/30 GRB_TIME: 48575.20 SOD {13:29:35.20} UT GRB_PHI: -23.21 [deg] GRB_THETA: 8.36 [deg] SOLN_STATUS: 0xA3 RATE_SIGNIF: 13.36 [sigma] IMAGE_SIGNIF: 6.00 [sigma] MERIT_PARAMS: +1 +0 +0 +5 +3 -4 +0 +1 -42 +1 SUN_POSTN: 37.89d {+02h 31m 33s} +14.91d {+14d 54' 32"} SUN_DIST: 65.07 [deg] MOON_POSTN: 304.30d {+20h 17m 13s} -25.07d {-25d 04' 15"} MOON_DIST: 76.13 [deg] MOON_ILLUM: 58 [%] GAL_COORDS: 94.89, -5.22 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 357.44, 54.94 [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 not a GRB. COMMENTS: Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection. COMMENTS: This is a RETRACTION of a previous notice that identified this as a GRB -- it is NOT a GRB. COMMENTS: This Notice was ground-reprocessed from flight-data. COMMENTS: THIS IS RETRACTION of the original Notice. COMMENTS: THIS IS NOT A GRB. COMMENTS: This trigger occurred on the rising edge of the SAA and was a very marginal trigger to begin with. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3321 SUBJECT: Swift-BAT Trigger 115881 is not a real GRB DATE: 05/04/30 17:58:00 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), C. Markwardt (GSFC/UMD), D. Palmer (LANL), B. Zhang (UNLV) on behalf of the Swift-BAT team: The Swift-BAT triggered (trigger=115881, GCN Circ 3320) at 13:29:35 UT is not due to a GRB. The trigger occured on the rising edge of the SAA. Ground analysis has confirmed the very low image-domain detection significance. A visual inspection of the mask-tagged light curve also shows no significant emission.