Gamma-ray Burst 050215

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Feb 05 02:16:27 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     106106,   Seg_Num: 0
GRB_RA:          348.396d {+23h 13m 35s} (J2000),
                 348.455d {+23h 13m 49s} (current),
                 347.822d {+23h 11m 17s} (1950)
GRB_DEC:         +49.325d {+49d 19' 31"} (J2000),
                 +49.353d {+49d 21' 11"} (current),
                 +49.053d {+49d 03' 10"} (1950)
GRB_ERROR:       4.00 [arcmin radius, statistical only]
GRB_INTEN:       35979 [cnts]    Peak=694 [cnts/sec]
TRIGGER_DUR:     8.192 [sec]
BKG_INTEN:       261350 [cnts]
BKG_TIME:        8040.00 SOD {02:14:00.00} UT
BKG_DUR:         64 [sec]
GRB_DATE:        13416 TJD;    46 DOY;   05/02/15
GRB_TIME:        8128.54 SOD {02:15:28.54} UT
GRB_PHI:         -68.02 [deg]
GRB_THETA:        24.39 [deg]
TRIGGER_INDEX:   477
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.29 [sigma]
IMAGE_SIGNIF:    9.00 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +0  +0  +0 -43  +1 
SUN_POSTN:       328.73d {+21h 54m 55s}  -12.68d {-12d 40' 57"}
SUN_DIST:         64.43 [deg]
MOON_POSTN:       43.06d {+02h 52m 14s}  +18.39d {+18d 23' 27"}
MOON_DIST:        53.31 [deg]
GAL_COORDS:      107.00,-10.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       15.86, 48.42 [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.

red DSS finding chart ps-file

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Feb 05 02:19:21 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     106106,   Seg_Num: 0 
GRB_RA:          348.396d {+23h 13m 35s} (J2000),
                 348.455d {+23h 13m 49s} (current),
                 347.822d {+23h 11m 17s} (1950) 
GRB_DEC:         +49.325d {+49d 19' 31"} (J2000),
                 +49.353d {+49d 21' 11"} (current),
                 +49.053d {+49d 03' 10"} (1950)
GRB_DATE:        13416 TJD;    46 DOY;   05/02/15 
GRB_TIME:        8128.54 SOD {02:15:28.54} UT
TRIGGER_INDEX:   477
GRB_PHI:         -68.02 [deg]
GRB_THETA:        24.39 [deg]
DELTA_TIME:      7.00 [sec]
LC_URL:          sw00106106000msb.lc
COMMENTS:        SWIFT-BAT GRB Lightcurve.
COMMENTS:        This does not match any source in the ground catalog.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Feb 05 03:10:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     106106,   Seg_Num: 0 
GRB_RA:          348.396d {+23h 13m 35s} (J2000),
                 348.455d {+23h 13m 49s} (current),
                 347.822d {+23h 11m 17s} (1950) 
GRB_DEC:         +49.325d {+49d 19' 30"} (J2000),
                 +49.353d {+49d 21' 11"} (current),
                 +49.053d {+49d 03' 09"} (1950) 
GRB_ERROR:       4.00 [arcmin radius, statistical only]
GRB_INTEN:       35979 [cnts]    Peak=694 [cnts/sec]
TRIGGER_DUR:     8.192 [sec]   
BKG_INTEN:       261350 [cnts] 
BKG_TIME:        8040.00 SOD {02:14:00.00} UT
BKG_DUR:         64 [sec]
GRB_DATE:        13416 TJD;    46 DOY;   05/02/15
GRB_TIME:        8128.53 SOD {02:15:28.53} UT
GRB_PHI:         -68.01 [deg]
GRB_THETA:        24.37 [deg]
TRIGGER_INDEX:   477
SOLN_STATUS:     0x3 
RATE_SIGNIF:     10.28 [sigma] 
IMAGE_SIGNIF:    9.00 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +0  +0  +0 -43  +1
SUN_POSTN:       328.73d {+21h 54m 55s}  -12.68d {-12d 40' 57"}
SUN_DIST:         64.43 [deg]
MOON_POSTN:       43.06d {+02h 52m 14s}  +18.39d {+18d 23' 27"}
MOON_DIST:        53.31 [deg]
GAL_COORDS:      107.00,-10.50 [deg] galactic lon,lat of the burst (or
+transient)      
ECL_COORDS:       15.86, 48.42 [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 Notice was ground-reprocessed from flight-data.
COMMENTS:        Ground analysis has confirmed this is real.
COMMENTS:        The lightcurve shows ~6 sec duration and all in the 15-25 keV
+band.
COMMENTS:        We note that this is close the Galactic Plane.
COMMENTS:        This burst is separate and distinct from the burst that
+occurred 18 min later.

GCN notice #3021
Title: GRB050215A: ROTSE-III Optical Observations
Smith, D. A., Rykoff, E. S., & Yost, S. A. (U. of Michigan) report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas responded to Swift GRB050215A (Trigger #106106). An automatic response resulted in a sequence of 29 images beginning 7.2 seconds after receipt of the GCN trigger. The first image was taken at 02:16:34.2, 65.7 sec after the burst trigger. The source was fairly low on the horizon and setting. We took 10 5-s, 10 20-s and 9 60-s exposures before the alert for GRB 050215B (Trigger #106107) interrupted the sequence (See Yost et al., coming soon) The images are unfiltered and were calibrated relative to USNO A2.0. As the source is in a crowded field at relatively low galactic latitude, our limits are adversely effected by source confusion. Individual images have limiting magnitudes ranging from 15.9-17.4. Comparison to DSS (second epoch) reveals no new sources within the 3-sigma error circle to a limiting magnitude of 17.4 and 17.6 for co-adds of 10 images taken between 66 s and 18 min after the burst.
GCN notice #3024
S. Barthelmy, L. Barbier, J. Cummings (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC), J. Greiner (MPE), D. Hinshaw (GSFC-SPSYS), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), T. Mitani (ISAS), K. Nakazawa (ISAS), J. Norris (GSFC), D. Palmer (LANL), A. Parsons, T. Sakamoto (GSFC) G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC), on behalf of the Swift-BAT team:
The BAT instrument on Swift triggered at 02:15:28 and at 02:33:12 UT 15 Feb 05, triggers 106106 and 106107, respectively. We have done preliminary analysis on the ground using the TDRSS messages and the initial portions of the data from a telemetry downlink.
For GRB050215a (Trigger 106106) the position is RA,Dec=348.382,+49.322 (J2000) with a position uncertainty of 4 arcmin (statistical plus systematic, 90% containment radius). The lightcurve is a single peak with a duration of ~6 seconds. Nearly all of the emission is in the 15-25 keV band. The Swift spacecraft automatically slewed to this burst and began follow-up observations, but that follow-up sequence was interrupted by the second burst (18 min later).
For GRB050215b (Trigger 106107) the position is RA,Dec=174.450,+40.805 (J2000) with a position uncertainty of 4 arcmin (statistical plus systematic, 90% containment radius). The lightcurve is a single peak with a duration of ~10 seconds. The emission extends from 15 to ~100 keV. The Swift spacecraft also automatically slewed to this burst location and is currently doing an extended follow-up observation on this burst. We note that this burst is well suited for ground-based optical follow-up observations in the Northern hemisphere.
We note that these bursts are clearly distinct and separate from each other. It is merely coincidental that these two bursts happened within a few hours after the enabling of the automatic real-time distribution of the Notices.
GCN notice #3025
A. Breeveld (MSSL), P. Roming (PSU), K. Mason, P. Schady (MSSL), M. Ivanushkina (PSU), T. Poole (MSSL), C. Gronwall (PSU), A. Blustin (MSSL), P. Brown (PSU), P. Schady, S. Rosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. Holland, M. Still (GSFC/USRA), W. Landsman (GSFC), S. Hunsberger (PSU), B. Hancock (MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos (PSU), T. Kennedy, P. Smith (MSSL), J. Hill (PSU), C. Markwardt (GSFC/UMD), T. Sakamoto (GSFC), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the Swift UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of GRB050215a (GCN 3024) on February 15, 2005 at 02:17:05 UT. We detect no source down to a magnitude of 19.2 in the UVW2-filter for a 9 second exposure starting 98s after the BAT trigger.

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Jochen Greiner, last update: 15-Feb-2005 [Disclaimer]