This file contains both bursts: A and B //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4188 SUBJECT: GRB 051105: Swift detection of a short burst DATE: 05/11/05 07:17:42 GMT FROM: Scott Barthelmy at NASA/GSFC T. Mineo (IASF-Pa/INAF), L. Barbier (GSFC), S. Barthelmy (GSFC), D. Burrows (PSU), M. Chester (PSU), N. Gehrels (GSFC), J. Kennea (PSU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), G. Tagliaferri (OAB/INAF) on behalf of the Swift team: At 06:26:41 UT, Swift-BAT triggered and located GRB 051105 (trigger=162580). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec 265.289d,+34.921d {17h 41m 09s,+34d 55' 15"} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows a single spike with a total duration of less than 128 msec. The peak count rate was ~3000 counts/sec (15-350 keV), at 0.0 seconds after the trigger. XRT began observing at 06:27:49.09 UT, 67.6 sec after BAT Trigger time. The on-board detection algorithm failed to find a centroid due to low source counts. The XRT light curve shows no X-ray emission in the field. Further analysis will require processing of the XRT full telemetry data following the next ground station contact. The UVOT began observing at 06:27:48 UT, 66.5 sec after the BAT trigger. Due to a delay in receipt of the initial data files, no results are currently available. The V-band extinction in the direction of the BAT GRB position is A_V = 0.11. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4189 SUBJECT: GRB 051105: Optical limit DATE: 05/11/05 10:14:49 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports on behalf of the ART collaboration: The error region of the short GRB 051105 (Mineo et al. GCN 4188) was observed by the 14 inch Automated Response Telescope. The first frame was acquired starting at 2005 November 5, 09:11 UT (2.8 hours after the burst) and 60 s integration in Ic band was repeated. We do not identify an afterglow candidate within the BAT error circle (GCN 4188) and derive the following 3 sigma upper limit relative to USNO-B1.0 magnitude. ------------------------------------------ StartUT Filter Limit Nframes ------------------------------------------ 09:12:30 Ic >18.1 19 ------------------------------------------ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4190 SUBJECT: GRB 051105: Swift-BAT refined analysis DATE: 05/11/05 12:03:06 GMT FROM: Hans Krimm at NASA-GSFC J. Cummings (GSFC/NRC), L. Barbier (GSFC), S. Barthelmy (GSFC), M. Chester (PSU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-60 to T+120 sec from the recent telemetry downlink, we confirm the short duration of GRB 051105 (trigger #162580) (Mineo, et al., GCN 4188). The BAT ground position is (RA,Dec) = 265.288,+34.904 {17h 41m 09s,+34d 55' 15"} [deg; J2000] +-1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%. The light curve shows a single peak with a fast rise and a slower decay. T90 (15-350 keV) is (0.028 +- 0.004) sec. (estimated error including systematics). All of the emission appears to be below 100 keV. Spectral analysis including flux values will follow in a later circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4191 SUBJECT: GRB 051105B (INTEGRAL 2701): Optical observation DATE: 05/11/05 13:19:05 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report: 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4192 SUBJECT: GRB051105B - A long GRB detected by INTEGRAL DATE: 05/11/05 13:52:31 GMT FROM: Sandro Mereghetti at IASF/CNR 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4193 SUBJECT: GRB 051105b: ART optical limits DATE: 05/11/05 13:55:52 GMT FROM: Ken ichi Torii at RIKEN 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 ------------------------------------------ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4194 SUBJECT: GRB 051105: Swift-BAT improved refined analysis DATE: 05/11/05 16:22:19 GMT FROM: Louis M Barbier at NASA/GSFC/Swift L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), T. Mitani (ISAS), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC), on behalf of the Swift/BAT team: We have re-analyzed GRB 051105 (GCN Circ 4188, Mineo et al., and GCN Circ 4190, Cummings et al.) based on new time interval T0 to T0 + 0.120 sec. The improved refined BAT ground position is (RA,Dec) = 265.277, 34.949, {17h 41m 6.6s, 34d 56' 56.8"} [deg; J2000] +- 2.5 arcmin, (90% containment). The partial coding was 81%. The photon index of the time-averaged spectrum is 1.33 +- 0.35 in the time interval TO + 0.122 sec. The fluence in the 15-150 keV band is (2.0 +- 0.46) x 10^-8 erg/cm2. The peak photon flux in the same time window measured in the 15-150 band is (2.0 +- 0.43) ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4195 SUBJECT: XRT observations of GRB 051105A DATE: 05/11/05 17:29:37 GMT FROM: Gianpiero Tagliaferri at OAB-INAF T.Mineo (INAF-IASFPA), G.Tagliaferri(INAF-OAB), D.Malesani(SISSA), P.Giommi (ASDC), D.Burrows(PSU), D. Fox (PSU) G.Chincarini(INAF-OAB and UNIMIB), and K. Page (U. Leicester) on behalf of the Swift XRT team The Swift XRT has observed the field of the BAT short burst GRB051105A (trigger=162580; GCN 4188, Mineo et al.) for 8.6 ks. There are four sources present in the field close to BAT refined error box (Barbier et al. GCN 4194): SR1 at RA= 17h 41m 10.06s, Dec=+34d 55m 48.1s (J2000) (1.4 arcmin from the BAT position) with a count rate of (1.0+/-0.5)E-3 cts s^-1. SR2 at RA= 17h 40m 45.66s, Dec=+34d 58m 06.7s (J2000) (4.8 arcmin from the BAT position) with a count rate of (1.1+/-0.5)E-3 cts s^-1. SR3 at RA= 17h 41m 07.60s, Dec=+34d 52m 33.0s (J2000) (4.4 arcmin from the BAT position) with a count rate of (1.1+/-0.5)E-3 cts s^-1. SR4 at RA= 17h 41m 05.17s Dec=+34d 52m 35.5s (J2000) (4.4 arcmin from the BAT position) with a count rate of (1.2+/-0.5)E-3 cts s^-1. The last two sources are very close to each other, but are resolved by the XRT. All these position have a 90% uncertainty of 6.5 arcsec. None of these sources seems to be fading, and therefore we do not associate any of them with the afterglow. On-going observations will shed more light on the nature of these sources. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4196 SUBJECT: GRB 051105A, optical observations DATE: 05/11/05 18:19:45 GMT FROM: Sylvio Klose at TLS Tautenburg S. Klose, U. Laux, and B. Stecklum, Thueringer Landessternwarte Tautenburg, report: Tautenburg started observing the error circle of GRB 051105A (Cummings et al. 2005) on Oct 05, 16:37 UT, i.e. about 10 hrs after the burst. Among the XRT sources reported in GCN 4195 (Mineo et al. 2005), only source S1 lies within the r=2.5 arcmin GRB error circle (Barbier et al. 2005, GCN 4194). This source is close to a galaxy. Since we can resolve this galaxy its redshift might be less than 0.5. A first inspection of the combined R-band image (9x5 min) shows two sources in the 6.5 arcsec error circle (S1). The brighter one at RA, DEC (J2000) = 17:41:10.05, 34:55:43.5 (+/- 1 arcsec, is barely visible on the DSS2, the fainter one, at RA, DEC = 17:41:10.21, 34:55:41.4 (+/- 1 arcsec), is beyond the limiting magnitude of the DSS2. Observations are ongoing. This message my be quoted. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4199 SUBJECT: GRB 051105A, radio observations DATE: 05/11/06 00:07:00 GMT FROM: Dale A. Frail at NRAO D. A. Frail (NRAO) and P. B. Cameron (Caltech) report on behalf of a larger collaboration: "We observed the field of GRB 051105A (GCN 4188; GCN 4194) with the Very Large Array at 8.5 GHz beginning November 5.80 UT. Within the ±2.5 arcmin BAT error radius we find one radio source in excess of 5-sigma with a flux density of 190 ± 17 uJy at RA(J2000)=17 41 3.19 DEC(J2000) = +34 59 04.1, with (conservative) astrometric errors of order 1 arcsec. There are no radio sources at the positions of the four XRT sources listed in GCN 4195. Given the relatively large size of the BAT error circle, and the lack of any flux variations we cannot determine whether this radio source is related to GRB 051105A. Further observations are planned. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." [GCN OPS NOTE(10dec06): The burst name in the Subject-line was changed from "051005A" to "051105A" to agree with the contents of the Circular.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4200 SUBJECT: GRB051105A: Swift/UVOT Observations DATE: 05/11/06 00:29:13 GMT FROM: Peter Brown at PSU P.J. Brown (PSU), T. Mineo (INAF-IASFPA), M. Chester (PSU), L. Angelini (GSFC-JHU), P. Meszaros (PSU), & N. Gehrels (GSFC) on behalf of the Swift/UVOT team report: The Swift-UVOT began observing the field of GRB 051105A (BAT Trigger=162580; Mineo et al. GCN 4188) at 2005-11-05 6:27:47, 66 seconds after the burst. No new source with respect to the DSS is visible in the 2.5' revised BAT error circle (Barbier et al. GCN 4194) during the first 200 second image (Tmid=166 seconds after the burst) down to a 5 sigma limiting magnitude of V=18.4. Using summed images, we also do not detect a new source in any of our 6 filters down to the following 5-sigma magnitude upper limits: Filter T_range(sec) Exp(sec) 5sigUL V 66-19067 2198 20.0 B 433-13687 961 20.6 U 379-25257 1345 20.5 W1 325-25103 2098 20.0 M2 271-24196 2303 20.4 W2 542-18160 2042 20.4 White 487-915 100 19.4 Where T_range is time post-trigger. At the position of XRT's SR1 (Mineo et al. GCN 4195), we marginally detect the brighter source (with counterpart in DSS) seen by Klose, Laux, & Stecklum (GCN 4196) but not the fainter source. We also detect the extended galaxy mentioned by Klose, Laux, & Stecklum (GCN 4196) to the east of SR1 in the optical filters and derive the following magnitudes and 3 sigma upper limits: V=19 +/- 0.1, B=20.4 +/- 0.2, U=20.5 +/- 0.2, UVW1>20.6, UVM2>21.0, UVW2>21.0. The non-detection of the galaxy in the UV is not necessarily due to redshift, as the limits are not that deep, but might indicate that there is not a high star formation rate in this galaxy. XRT positions SR2,3,4 (Mineo et al. GCN 4195) each contain an optical counterpart (visible in the DSS) within the north edge of the error circle. They are outside the revised BAT error circle as mentioned by Klose, Laux, & Stecklum (GCN 4196). We do not detect a source at the position of the radio source detected by Frail & Cameron (GCN 4199). Further observations and analysis are underway. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4201 SUBJECT: GRB 051105A: TNG optical observations DATE: 05/11/06 01:35:56 GMT FROM: Stefano Covino at Brera Astronomical Observatory S. Piranomonte (INAF/OAR), S. Covino (INAF/OAB), A. Antonelli (INAF/OAR), D. Malesani (SISSA), T. Mineo (INAF/IASFPA), G. Tagliaferri (INAF/OAB), A. Magazzu' (INAF/TNG), N. Pinilla-Alonso (INAF/TNG) on behalf of the CIBO collaboration report: We observed the field of GRB 051105A (Mineo et al., GCN 4188; Cummings et al., GCN 4190) with the TNG equipped with DOLORES on October 05 from 19:41 UT to 20:41 UT (more than 13 hours after the burst) in the R band. Preliminary analysis shows that inside the XRT SR1 (Mineo et al., GCN 4195) error circle one only object at coordinates (J2000) RA, DEC = 17:41:09.95, 34:55:44.5 (error +/- 1 arcsec) is visible. The object magnitude is R=21.19 +/- 0.03 assuming R=17.0 for the star U1200_08571196 at coordinates RA,DEC = 17:41:14.05, 34:55:35.1. This object is also present in the USNO catalogue. One more fainter source is located just outside the error circle at coordinates RA: 17:41:10.25 and DEC: 34:55:39.9. These two sources are probably the same detected by Klose et al. (GCN 4196). Moreover, a very faint source, close to our detection limit, might also be present at the position of the radio source reported by Frail et al. (GCN 4199). We acknowledge the support received from the TNG staff. Further observations are planned. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4202 SUBJECT: GRB 051105a: MDM Observations DATE: 05/11/06 05:04:24 GMT FROM: Jules Halpern at Columbia U. J. P. Halpern, S. Tonnesen, S. Tuttle (Columbia U.), and N. Mirabal (U. Michigan) report on behalf of the MDM Observatory GRB follow-up team: "We observed the location of Swift GRB 051105a (Mineo et al., GCN #4188) using the MDM 2.4m telescope, with a 4.6x4.6 arcminute field centered on the improved BAT position (Barbier et al., GCN #4194). A total of 2 and 30 minutes exposure were obtained in the Gunn g and r filters, respectively. The mean epoch of the observations was Nov. 6 02:39 UT, or 20 hours after the burst. The following R magnitudes of objects mentioned in previous GCN circulars were measured, referenced to the comparison star magnitude R=17.0 used by Piranomonte et al. (GCN #4201): --------------------------------------------------------------------------- R.A. (J2000) Decl. (J2000) R(mag) ID GCN ref --------------------------------------------------------------------------- 17 41 10.00 +34 55 45.2 21.15 +/- 0.03 inside XRT S1 4195,4196,4201 17 41 10.28 +34 55 41.1 22.50 +/- 0.12 outside XRT S1 4196,4201 17 41 03.28 +34 59 03.6 23.24 +/- 0.22 radio 4199 --------------------------------------------------------------------------- Positional uncertainties are 0.3" in the USNO B1.0 reference system, except for the faint object that is, nevertheless, consistent in position with the radio source of Frail & Cameron (GCN #4199). The bright object in the error circle of XRT S1 is clearly blue in g-r, as well as on the Palomar Sky Survey plates, and might therefore be an X-ray detected QSO. Our magnitude of it is consistent with that measured by Piranomonte et al. (GCN #4201) 7 hours earlier." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4203 SUBJECT: GRB 051105A, 2nd epoch optical observations DATE: 05/11/06 17:55:59 GMT FROM: Sylvio Klose at TLS Tautenburg S. Klose, P. Ferrero, D. A. Kann, U. Laux, and B. Stecklum, Thueringer Landessternwarte Tautenburg, report: Using the Tautenburg 1.34-m Schmidt telescope we have performed a 2nd epoch observation of the error circle of GRB 051105A (Cummings et al. 2005; Barbier et al. 2005, GCN 4194) starting on Oct 06, 17:30 UT, i.e. about 34 hrs after the burst. A comparison of the combined 2nd epoch image (9x5 min, R band) with the combined image obtained during the first observing run (Klose et al. 2005, GCN 4196) shows no obvious afterglow candidate in the error circle of the XRT source S1 (Mineo et al. 2005, GCN 4195). The faint R-band source which was reported in GCN 4196 has not disappeared and shows no obvious evidence for a fading. Assuming for simplicity a power-law decay slope of alpha = 1.0, we would expect that if this were the afterglow it would have faded below our detection limit. This message my be quoted. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4204 SUBJECT: GRB 051105a, observation from Naini Tal and OSN DATE: 05/11/06 23:19:18 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Antonio de Ugarte Postigo, Shashi B. Pandey, Martin JelĂ­nek, Alberto J. Castro-Tirado, Victor Casanova, Javier Gorosabel and Sergey Guziy (IAA-CSIC, Granada, Spain), Kuntal Mishra and Atish Kamble (ARIES NainiTal, India) report: "We have observed the field of GRB 051105a (Cummings et al., GCN 4190, Barbier et al., GCN 4194) with 1.0m Nainital telescope starting 8 hours after the GRB in the R-band (4x5min) and with 1.5m OSN starting 12 and 36 hours after the GRB in R (10x5min) and I (10x5min) bands. We inspected the complete BAT errorbox (Barbier et al., GCN 4194) and we do not detect any significantly decaying object. Particularly we do not detect any variation among the three sources reported by Klose et al. (GCN 4196) or of the optical counterpart (Piranomonte et al., GCN 4201) of the radio source reported by Frail et al. (GCN 4199)¨ This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4209 SUBJECT: GRB051105B: Swift/UVOT upper limit DATE: 05/11/08 01:48:53 GMT FROM: Alexander Blustin at MSSL-UCL 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). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4210 SUBJECT: GRB051105B: Swift/XRT upper limit DATE: 05/11/08 10:33:57 GMT FROM: Gianpiero Tagliaferri at OAB-INAF 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4223 SUBJECT: GRB051105B: REM Optical observation DATE: 05/11/09 11:21:56 GMT FROM: Silvia Piranomonte at OAR 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). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4242 SUBJECT: GRB 051105a: GETS optical limit DATE: 05/11/10 08:40:38 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report: The error region of the short GRB 051105a (Mineo, et al. GCN 4188) was imaged by the robotic 0.25m GETS telescope in the Gunma Astronomical Observatory. Unfiltered imaging started at 09:25:04 UT (3.0 hours after the trigger) and 30 s integration was repeated. We do not identify a new object within the BAT error region (GCN 4188) and the following upper limits are derived relative to USNO-A1.0 R mag. ------------------------------------------ StartUT Limit Nframes ------------------------------------------ 09:31:16 >18.3 52 10:07:51 >18.0 96 ------------------------------------------ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4349 SUBJECT: GRB051105: optical observations DATE: 05/12/14 18:07:57 GMT FROM: Alexei Pozanenko at IKI, Moscow D. Sharapov, M. Ibrahimov (MAO), A.Pozanenko (IKI), V.Rumyantsev (CrAO) on behalf of larger GRB follow up collaboration report: We observed the error box of short duration GRB051105 (Mineo et al. GCN 4188) with 1.5m telescope of Maidanak Astronomical Observatory under good weather condition (seeing ~1.1). Set of R images were taken starting on Nov.5 (UT) 13:59, i.e. 7.6 hours after burst onset. The BAT refined error box (Barbier et al. GCN 4194) is partially covered (~70%). The second set of R images were taken on Dec.1 between (UT) 13:33 and 14:09. The following R magnitudes of objects mentioned in GCN circulars 4195,4196,4201,4199,4202,4203,4204 were estimated at mean epoch of observation (UT) Nov.5 14:17 --------------------------------------------------------- R.A. (J2000) Decl. (J2000) R(mag) ID --------------------------------------------------------- 17 41 10.00 +34 55 45.2 21.50 0.16 inside XRT S1 17 41 10.28 +34 55 41.1 22.54 0.40 outside XRT S1 17 41 03.28 +34 59 03.6 out of image radio --------------------------------------------------------- The estimations are based on the comparison star magnitude R=17.0 used by Piranomonte et al. (GCN 4201); coordinates in the table are taken from Halpern at al. (GCN 4202). No new/fading source was detected within ~70% of refined BAT error box (Barbier et al. GCN 4194) between both epochs of our observations. The photometry of extended galaxy mentioned by Klose, Laux, & Stecklum (GCN 4196) and details of the observations are following Mid time, Exposure, Galaxy, Mag.(UL),Seeing (UT) (s) R(mag) Nov.5 14:17 1380 18.211 +/- 0.022 22.1 1.10" Dec.1 13:51 1800 18.122 +/- 0.019 21.8 1.45" Using available at this time observations we cannot confirm possible re-brightening of the galaxy in the 2nd epoch. Detailed calibrations are necessary and further monitoring of the galaxy would be encouraged. If confirmed then it might be connected with SN associated with short duration GRB051105. The stacked images of both epochs can be found at http://grb.rssi.ru/GRB051105/. The message may be cited.