//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5665 SUBJECT: GRB 060930: A long X-ray rich GRB detected by INTEGRAL DATE: 06/09/30 10:17:58 GMT FROM: Sandro Mereghetti at IASF/CNR D.Gotz (CEA, Saclay), S.Mereghetti, A.Paizis (IASF-Milano), M.Lazos, N.Mowlavi, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: An X-ray rich GRB lasting about 20 s has been detected by IBAS in IBIS/ISGRI data at 09:04:09 UT on September 30, 2006. The coordinates (J2000) are: RA: 304.5363 [degrees], DEC: -23.6253 with an uncertainty of 2.5 arcmin (90% c.l.). The peak flux in the 20-200 keV is 0.3 ph/cmq/s (2.2x10e-8 erg/cmq/s) over 1 s integration time and the fluence in the same energy range is 2.5x10e-7 erg/cmq We note that the faint ROSAT X-ray source 1RXS J201811.2-233536 is contained in the error region. Its RASS count rate of 0.03 counts/s corresponds to about 2x10e-13 erg/cmq/s 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 CIRCULAR NUMBER: 5666 SUBJECT: GRB 060930: ROTSE-III Optical Limits DATE: 06/09/30 12:48:59 GMT FROM: Heather Swan at U.of Michigan/ROTSE H. Swan (U. Michigan), W. Rujopakarn (U. Arizona), S.A. Yost (U. Michigan), E.S. Rykoff (U. Michigan), B. E. Schaefer (Louisiana State), report on behalf of the ROTSE collaboration: ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 060930 (Integral trigger 3503), producing images beginning 6.3 s after the GCN notice time. An automated response took the first image at 09:05:08.3 UT, 44.1 s after the burst, under fair conditions. We took 10 5-sec, 10 20-sec and 80 60-sec exposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma error circle, for both single images and coadding into sets of 10. Individual images have limiting magnitudes ranging from 15.8-17.1; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 09:05:08.3 09:05:13.3 5 15.8 44.1 N 09:05:08.3 09:07:44.3 156 17.1 44.1 Y //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5669 SUBJECT: GRB 060930: Xinglong TNT optical observations DATE: 06/09/30 17:59:11 GMT FROM: W.K. Zheng at NAOC M.Zhai, L.P. Xin, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng Y. Urata and W.K. Zheng on behalf of EAFON report: We have imaged the field of GRB 060930 with the TNT 0.8m telescope at Xinglong Observatory.Observations started about 2.74 hours after the burst under bad condition (cloudy and high airmass). in our combined 6*10 minutesR band image, we do not detect any new source down to ~17.25 with mean time 3.55 hours after the burst derived from USNO A2.0 This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5670 SUBJECT: GRB060930: Faulkes Telescope South observation DATE: 06/09/30 20:34:18 GMT FROM: Carole Mundell at ARI, JMU,Liverpool C. Guidorzi (Univ Bicocca & INAF-OAB), D. Bersier (Liverpool JMU), C.G. Mundell, I.A. Steele, A. Melandri, A. Gomboc (University of Ljubljana), R.J. Smith, A. Monfardini, D. Carter, S. Kobayashi, M. Bode (Liverpool JMU), E. Rol, P. O'Brien, N. Bannister (Leicester) report: "The 2m Faulkes Telescope South (Siding Spring, Australia) automatically reacted to the INTEGRAL burst GRB 060930 (Gotz et al., GCN Circ. 5665) and began observing 1.98 minutes after the burst trigger time. From a stacked 6x10s R-band image (from 1.98 min to 4.97 min after the burst) with a FOV of 4.75' x 4.75' centred on the first INTEGRAL error circle (RA=20:17:58; Dec=-23:38:16, J2000) we do not detect any object not present on the DSS, down to R~19.5 (calibrated with the USNOB catalogue). Furthermore we do not detect any variable object down to the same limit." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5682 SUBJECT: GRB 060930: near-IR afterglow candidate DATE: 06/10/02 10:49:55 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia A. de Ugarte Postigo, M. Jelinek, A.J. Castro-Tirado, J.Gorosabel (IAA-CSIC Granada), N. Pinilla-Alonso (TNG La Palma) J. de León Cruz (IAC Tenerife), J. Licandro (ING-IAC) on behalf of a larger collaboration report: We have observed the field of the GRB 060930 detected by INTEGRAL (Gotz et al., GCN 5665) with the 3.5m Telescopio Nazionale Galileo (+NICS) at La Palma in the JHK bands on 30 Sep 2006 (from 20:30 to 20:51 UT) and revisited the field in H band on 1 Oct 2006 (from 20:37 to 20:51 UT; i.e. 11.5 hr and 35.5 hr respectively after the onset of the gamma-ray event). The NICS frames cover the central 80% of the INTEGRAL/IBIS error box (2.5' radius). We detect a variable, stationary object at the following coordinates (J2000): RA = 20:18:11.51, Dec = -23:37:19.6 with an astrometric error of 0.5". In the first epoch the source is detected in all 3 bands and has an H band magnitude of ~18.2. In the second H band epoch it has faded by about 1 magnitude. This would imply a decay index of alpha -0.9 +/- 0.2 . For this object we obtain (Js-K)=1.10+/-0.22, consistent with the near-IR colour expected for a GRB afterglow (Gorosabel et al. 2002, A&A, 384, 11). A finding chart is available at: http://www.iaa.es/~deugarte/GRBs/060930/grb060930.gif This message is quotable. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5701 SUBJECT: GRB 060930: near-IR afterglow candidate retraction DATE: 06/10/06 22:35:41 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia A. de Ugarte Postigo, M. Jelinek, A.J. Castro-Tirado, J. Gorosabel (IAA-CSIC Granada) on behalf of a larger collaboration report: "We have reobserved the field of GRB 060930 (GCNC 5665) on a third epoch. This time we obtained frames with the 3.5m Calar Alto telescope in the H-band on Oct. 5.81 UT. The magnitude of the suspected afterglow candidate that we reported in GCNC 5682 is consistent with the one measured on the first epoch and we believe that the data taken on the second epoch (Oct 1.86 UT) were severely affected due to the presence of the Moon four degrees away. We thus conclude that the object reported in GCNC 5682 is not the near-IR afterglow to GRB 060930. A search for variability of the faintest near-IR sources within the INTEGRAL error box is under way. We acknowledge Heather F. Swan for also independently pointing out this to us by means of AEOS data." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5736 SUBJECT: GRB 060930: MARGE Optical Limits DATE: 06/10/19 21:17:41 GMT FROM: Heather Swan at U.of Michigan/ROTSE H. Swan (U. Michigan), C. Akerlof (U. Michigan), M. Skinner (AMOS Observatory, Boeing LTS), report on behalf of the MARGE collaboration: The AEOS Burst Camera (ABC) began imaging GRB060930 (GCN 5665) Sept 30 09:15:47.3 UTC, ~11 minutes after the GRB was detected, obtaining ~ 2 hrs of images of the error box. We coadded 10s images into sets of 20. Comparison of these images with images taken on Oct 5th, 2006 reveals no optical counterpart within the 2.5 arc minute error radius. We have a 3 sigma limiting magnitude of 21.0 for our coadded images. [GCN OPS NOTE(19oct06): Per author's request, the Subject line was corrected to the 060930 burst.]