Gamma-ray Burst 050626

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 26 Jun 05 03:46:50 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    2587,   Sub_Num: 0
GRB_RA:         186.7407d {+12h 26m 58s} (J2000),
                186.8181d {+12h 27m 16s} (current),
                186.0394d {+12h 24m 09s} (1950)
GRB_DEC:        -63.1367d {-63d 08' 11"} (J2000),
                -63.1670d {-63d 10' 00"} (current),
                -62.8600d {-62d 51' 35"} (1950)
GRB_ERROR:      3.22 [arcmin, radius, statistical only]
GRB_INTEN:      8.51 [sigma]
GRB_TIME:       13584.01 SOD {03:46:24.01} UT
GRB_DATE:       13547 TJD;   177 DOY;   05/06/26
SC_RA:          181.52 [deg] (J2000)
SC_DEC:         -64.03 [deg] (J2000)
SUN_POSTN:       95.07d {+06h 20m 17s}  +23.36d {+23d 21' 23"}
SUN_DIST:       111.49 [deg]
MOON_POSTN:     333.85d {+22h 15m 24s}  -15.00d {-15d 00' 04"}
MOON_DIST:       97.75 [deg]
GAL_COORDS:     300.17, -0.40 [deg] galactic lon,lat of the burst
ECL_COORDS:     221.96,-52.88 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 26 Jun 05 03:47:09 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    2587,   Sub_Num: 1
GRB_RA:         186.7370d {+12h 26m 57s} (J2000),
                186.8144d {+12h 27m 15s} (current),
                186.0357d {+12h 24m 09s} (1950)
GRB_DEC:        -63.1424d {-63d 08' 32"} (J2000), 
                -63.1727d {-63d 10' 21"} (current),
                -62.8657d {-62d 51' 56"} (1950)
GRB_ERROR:      2.68 [arcmin, radius, statistical only]
GRB_INTEN:      17.55 [sigma]  
GRB_TIME:       13608.24 SOD {03:46:48.24} UT
GRB_DATE:       13547 TJD;   177 DOY;   05/06/26
SC_RA:          181.52 [deg] (J2000)
SC_DEC:         -64.03 [deg] (J2000)
SUN_POSTN:       95.07d {+06h 20m 17s}  +23.36d {+23d 21' 23"}
SUN_DIST:       111.49 [deg]   
MOON_POSTN:     333.85d {+22h 15m 25s}  -15.00d {-14d 59' 58"}
MOON_DIST:       97.75 [deg]
GAL_COORDS:     300.17, -0.40 [deg] galactic lon,lat of the burst
ECL_COORDS:     221.97,-52.89 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates. 
COMMENTS:       Possibly real GRB event

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 26 Jun 05 03:49:45 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    2587,   Sub_Num: 2
GRB_RA:         186.7353d {+12h 26m 56s} (J2000),
                186.8127d {+12h 27m 15s} (current),
                186.0341d {+12h 24m 08s} (1950)
GRB_DEC:        -63.1396d {-63d 08' 22"} (J2000), 
                -63.1699d {-63d 10' 11"} (current),
                -62.8629d {-62d 51' 45"} (1950)
GRB_ERROR:      2.68 [arcmin, radius, statistical only]
GRB_INTEN:      17.60 [sigma]
GRB_TIME:       13617.12 SOD {03:46:57.12} UT
GRB_DATE:       13547 TJD;   177 DOY;   05/06/26
SC_RA:          181.52 [deg] (J2000)
SC_DEC:         -64.03 [deg] (J2000)
SUN_POSTN:       95.07d {+06h 20m 17s}  +23.36d {+23d 21' 23"}
SUN_DIST:       111.49 [deg]   
MOON_POSTN:     333.85d {+22h 15m 25s}  -15.00d {-14d 59' 56"}
MOON_DIST:       97.75 [deg]
GAL_COORDS:     300.17, -0.40 [deg] galactic lon,lat of the burst
ECL_COORDS:     221.96,-52.88 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates. 
COMMENTS:       Possibly real GRB event

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 26 Jun 05 04:31:02 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    2587,   Sub_Num: 3
GRB_RA:         186.7444d {+12h 26m 59s} (J2000),
                186.8218d {+12h 27m 17s} (current),
                186.0431d {+12h 24m 10s} (1950)
GRB_DEC:        -63.1342d {-63d 08' 02"} (J2000), 
                -63.1645d {-63d 09' 51"} (current),
                -62.8575d {-62d 51' 26"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      8.51 [sigma]   
GRB_TIME:       13584.01 SOD {03:46:24.01} UT
GRB_DATE:       13547 TJD;   177 DOY;   05/06/26
SC_RA:          181.52 [deg] (J2000)
SC_DEC:         -64.03 [deg] (J2000)
SUN_POSTN:       95.07d {+06h 20m 17s}  +23.36d {+23d 21' 23"}
SUN_DIST:       111.49 [deg]   
MOON_POSTN:     333.85d {+22h 15m 24s}  -15.00d {-15d 00' 04"}
MOON_DIST:       97.75 [deg]
GAL_COORDS:     300.17, -0.39 [deg] galactic lon,lat of the burst
ECL_COORDS:     221.96,-52.88 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates. 
COMMENTS:       REFINED_COORDINATES_AFTER_OFFLINE_ANALYSIS

red DSS finding chart ps-file
GCN notice #3552
D. Gotz, S. Mereghetti (IASF, Milano), N. Mowlavi, S. Shaw, M. Beck, A. Neronov (ISDC, Versoix), J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report
A 60 s long GRB has been detected in IBIS/ISGRI data by IBAS (Alert Number 2587) at 03:45:16 UT. Its coordinates (J2000) are
```
RA: 186.7445
DEC: -63.1342
```
with an uncertainty of 2 arcmin (90% c.l.).
The preliminary peak flux is 0.4 ph (3E-8 erg) cmsq/s, while the fluence is 8.7E-7 erg/cmsq. Both values refer to the 20-200 keV band.
A preliminary spectral analysis shows that this event is X-ray rich.
A light curve will be posted at
http://ibas.mi.iasf.cnr.it/IBAS_Results.html
This message can be cited.
GCN notice #3553
D. Gotz (IASF, Milano) on behalf of the IBAS Localization Team reports:
The subject of GCN 3552 should refer to GRB 050626 and not to 050625. We aplogize for the misprint.
This messages can be cited.
GCN notice #3564
V. Mangano, T. Mineo, V. La Parola, G. Cusumano (INAF-IASF/Palermo), S. Hunsberger (PSU), D. Morris (PSU), A. Beardmore, K. Page (U. Leicester), P. Boyd (GSFC-UMBC), L. Angelini (GSFC-JHU) and D. N. Burrows (PSU) report on behalf of the Swift XRT team:
Swift observed GRB 050626 (D. Gotz at al, GCN3552) with XRT in Photon Counting (PC) mode for three times starting between 2005-06-29 03:38:54 and 2005-07-01 12:10:42 and collected a total of 38.6 ks. (Observations were delayed by several days because the Integral source was initially located near the Swift orbital pole, and was within the Swift Earth avoidance angle.) The three observations were performed in manual state to avoid the automatic switching in Windowed Timing (WT) mode caused by the presence of two bright optical stars within 3 arcmin of the INTEGRAL position.
Only one uncataloged X-ray source was detected within the INTEGRAL error circle, at
RA(J2000) = 12h 27m 01.2s Dec(J2000) = -63:08:13.9,
i.e. 20 arcsec from the INTEGRAL position. The count rate of this source has been found to be steady within errors at the average level of (1.6 +/- 0.4)E-3 counts/s, making it unlikely to be the X-ray afterglow of the GRB.
No afterglow candidate was detected within the INTEGRAL error circle. We estimate 3 sigma upper limits of 7.9E-14, 6.6E-14, and 1.6E-13 erg cm-2 s-1 for the flux of the GRB afterglow in the first, second and third observations, respectively and a 3 sigma upper limit of 3.8E-14 erg cm-2 s-1 in the sum of the three observations.
GCN notice #3565
J. Gorosabel, A.J. Castro-Tirado, (IAA-CSIC), P. Tristam, T. Britton, Ph. Yock (Univ. of Auckland), S. Guziy, A. de Ugarte Postigo, M. Jelinek (IAA-CSIC), O. Bogdanov (Nikolaev State Univ.), report:
"We have observed the error box of the INTEGRAL GRB 050626 (Gotz et al. GCN Circ. 3552). The observations were carried out ~4 hours after the gamma-ray event with the 0.6 m telescope at Mt. John Astronomical Observatory (MOA) using the MOA wide red filter (Texp=5x300s). We note the presence of Alpha Crucis (R=1.3) close to the error box, which produces a strong background gradient in our images. Thus, the deepness of the combined image ranges approximately from R~14 to R~20.5 depending on the position within the error box. Comparison with the DSS did not reveal any variable source in the INTEGRAL error box, including the position of the unlikely X-ray afterglow (Mangano et al., GCN Circ. 3564). At this X-ray source position the limiting magnitude of our combined image is approximately R~20."
This message can be cited.

Back to JG's homepage

Jochen Greiner, last update: 06-Jul-2005 [Disclaimer]