Gamma-ray Burst 051105B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 05 Nov 05 11:06:06 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    2701,   Sub_Num: 0
GRB_RA:           9.4577d {+00h 37m 50s} (J2000),
                  9.5280d {+00h 38m 07s} (current),
                  8.8552d {+00h 35m 25s} (1950)
GRB_DEC:        -40.4915d {-40d 29' 28"} (J2000),
                -40.4594d {-40d 27' 33"} (current),
                -40.7664d {-40d 45' 58"} (1950)
GRB_ERROR:      2.83 [arcmin, radius, statistical only]
GRB_INTEN:      12.98 [sigma]
GRB_TIME:       39950.00 SOD {11:05:50.00} UT
GRB_DATE:       13679 TJD;   309 DOY;   05/11/05
SC_RA:            7.04 [deg] (J2000)
SC_DEC:         -42.37 [deg] (J2000)
SUN_POSTN:      220.68d {+14h 42m 43s}  -15.78d {-15d 46' 48"}
SUN_DIST:       116.75 [deg]
MOON_POSTN:     265.31d {+17h 41m 14s}  -28.32d {-28d 19' 11"}
MOON_DIST:       81.76 [deg]
GAL_COORDS:     313.95,-76.34 [deg] galactic lon,lat of the burst
ECL_COORDS:     349.16,-40.20 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 05 Nov 05 11:09:07 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    2701,   Sub_Num: 1
GRB_RA:           9.4653d {+00h 37m 52s} (J2000),
                  9.5356d {+00h 38m 09s} (current),
                  8.8628d {+00h 35m 27s} (1950)
GRB_DEC:        -40.4847d {-40d 29' 04"} (J2000),
                -40.4526d {-40d 27' 08"} (current),
                -40.7595d {-40d 45' 33"} (1950)
GRB_ERROR:      2.82 [arcmin, radius, statistical only]
GRB_INTEN:      13.21 [sigma]
GRB_TIME:       39955.24 SOD {11:05:55.24} UT
GRB_DATE:       13679 TJD;   309 DOY;   05/11/05
SC_RA:            7.04 [deg] (J2000)
SC_DEC:         -42.37 [deg] (J2000)
SUN_POSTN:      220.68d {+14h 42m 43s}  -15.78d {-15d 46' 48"}
SUN_DIST:       116.76 [deg]
MOON_POSTN:     265.31d {+17h 41m 14s}  -28.32d {-28d 19' 11"}
MOON_DIST:       81.77 [deg]
GAL_COORDS:     313.93,-76.35 [deg] galactic lon,lat of the burst
ECL_COORDS:     349.17,-40.20 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Possibly real GRB event

GCN Circular #4191
K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report:
s The error region of the INTEGRAL trigger #2701 was imaged by the robotic 0.25m GETS telescope in the Gunma Astronomical Observatory. Unfiltered imaging started at 11:14:11 UT (304 s after the trigger) and 30 s integration was repeated.
Preliminary analysis does not show a new object within the refined 2'.82 radius error region (Seq_Num 1) and the following upper limits are derived.
```
------------------------------------------
StartUT  Limit  Nframes
------------------------------------------
11:14:11 >11.2  1
11:28:40 >15.0  21
------------------------------------------
```
We note a bright (9th magnitude) star, SAO 215170, within the INTEGRAL error circle.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 05 Nov 05 13:50:07 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    2701,   Sub_Num: 2
GRB_RA:           9.4771d {+00h 37m 55s} (J2000),
                  9.5474d {+00h 38m 11s} (current),
                  8.8747d {+00h 35m 30s} (1950)
GRB_DEC:        -40.4812d {-40d 28' 51"} (J2000),
                -40.4491d {-40d 26' 56"} (current),
                -40.7560d {-40d 45' 21"} (1950)
GRB_ERROR:      2.50 [arcmin, radius, statistical only]
GRB_INTEN:      12.98 [sigma]
GRB_TIME:       39950.00 SOD {11:05:50.00} UT
GRB_DATE:       13679 TJD;   309 DOY;   05/11/05
SC_RA:            7.04 [deg] (J2000)
SC_DEC:         -42.37 [deg] (J2000)
SUN_POSTN:      220.68d {+14h 42m 43s}  -15.78d {-15d 46' 48"}
SUN_DIST:       116.77 [deg]
MOON_POSTN:     265.31d {+17h 41m 14s}  -28.32d {-28d 19' 11"}
MOON_DIST:       81.78 [deg]
GAL_COORDS:     313.90,-76.36 [deg] galactic lon,lat of the burst
ECL_COORDS:     349.18,-40.20 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       REFINED_COORDINATES_AFTER_OFFLINE_ANALYSIS

GCN Circular #4192
S. Mereghetti (IASF, Milano), D.Gotz (CEA, Saclay), N. Mowlavi, S. Shaw, M. Beck, A. Neronov, J.Soldan (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
A 20 s long GRB has been detected by IBAS in IBIS/ISGRI data at 11:05:50 UT on November 5 2005. Its refined coordinates (J2000) are:
```
RA:    9.4771 [degrees]
DEC: -40.4812 [degrees]
```
with an uncertainty of 2 arcmin (90% c.l. radius).
A plot of the light curve will be posted at
http://ibas.mi.iasf.cnr.it/IBAS_Results.html
This message can be cited.
GCN Circular #4193
K. Torii (Osaka U.) reports on behalf of the ART collaboration:
The error region of the INTEGRAL GRB 051105b (Mereghetti et al. GCN4192) was observed by the 14 inch Automated Response Telescope. Imaging started at 2005 November 5, 11:07:29 UT (94 s after the trigger) and 60 s integration in Ic band was repeated. Early data suffered from low transparency.
We note a bright star, SAO 215170 (V=9.0), within the INTEGRAL error circle. While no new object is identified and the following upper limits are derived for an optical afterglow.
```
------------------------------------------
StartUT Filter  Mag     Nframes
------------------------------------------
11:19:21 Ic     > 7.3   1
11:24:42 Ic     >10.7   2
------------------------------------------
```
GCN Circular #4209
A. J. Blustin (UCL-MSSL), S. Campana (OAB/ASDC), J. Nousek (PSU), N. White (GSFC), N. Gehrels (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 051105B on 2005-11-05 at 11:05:50 UT, ~2.25 days after the INTEGRAL trigger (Mereghetti et al., GCN 4192). No new source with respect to the DSS is observed within the 2 arcminute radius IBAS error circle in coadded V-band exposures down to the following 5-sigma magnitude upper limit:
```
Filter  T_range(days)  Exp(sec)  5sigUL
V       2.25-2.38      4932      20.4
```
We note that there was a high image background in the region of the IBIS error circle due to the presence of a Vmag=9 star within it (as mentioned by Torii, GCN 4193).
GCN Circular #4210
T. Mineo (INAF-IASF PA), S. Campana (INAF-OAB), G. Chincarini (INAF-OAB and UNIMIB), D. Malesani (SISSA), A. Moretti (INAF-OAB), P. Romano (INAF-OAB), G. Tagliaferri (INAF-OAB) on behalf of the Swift XRT team
The Swift/XRT began observing the field of GRB 051105B on 2005-11-07 at 16:41:31 UT, about 2.25 days after the INTEGRAL trigger (GCN 4192; Mereghetti et al.). A weak X-ray source is detected at RA(2000)=00h 37m 53.7s' Dec(2000)=-40d 29m 14s, with an estimated uncertainty of 7 arcsec (90% containment), including corrections for the XRT boresight offset. This source is 3.7 arcsec away from the bright star HD 3516, which we identify as the optical counterpart. No other X-ray source is detected within the BAT error circle. The 3 sigma upper limit is 1.1E-03 cts/s corresponding to an unabsorbed 0.2-10 keV flux of 5E-14 erg cm^-2 s^-1, assuming a power-law model with an energy index slope of -1 and a Galactic absorbing column of 3.0E20 cm^-2.
GCN Circular #4223
E. Distefano, S. Piranomonte, E. Molinari, G. Chincarini, F.M. Zerbi, M. Rodono', S. Covino, V. Testa, G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G. Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on behalf of the REM/ROSS Team report:
On Nov 05, 2005 the field of GRB051105B (Mereghetti et al. GCN4192) has been observed with the REM telescope located in La Silla (Chile).
The field was imaged with ROSS REM instrument in R, V and I filters starting at 2005-11-06T02:20:58 UT (approximately 1 hour after the burst) for a total integration time of 120 seconds for each filter.
No sources are detected within IBAS Integral error circle (Mereghetti et al. GCN4192) down to a limiting magnitude of 17.9, 17.1, 18.4 respectively (3-sigma upper limit).

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Jochen Greiner, last update: 09-Nov-2005 [Disclaimer]