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2009ApJ...690.1068A - Astrophys. J., 690, 1068-1073 (2009/January-2)

HESS observations of the prompt and afterglow phases of GRB 060602B.

AHARONIAN F., AKHPERJANIAN A.G., BARRES DE ALMEIDA U., BAZER-BACHI A.R., BEHERA B., BEILICKE M., BENBOW W., BERNLOHR K., BOISSON C., BORREL V., BRAUN I., BRION E., BRUCKER J., BUHLER R., BULIK T., BUSCHING I., BOUTELIER T., CARRIGAN S., CHADWICK P.M., CHAVES R., CHOUNET L.-M., CLAPSON A.C., COIGNET G., CORNILS R., COSTAMANTE L., DALTON M., DEGRANGE B., DICKINSON H.J., DJANNATI-ATAI A., DOMAINKO W., DRURY L.O'C., DUBOIS F., DUBUS G., DYKS J., EGBERTS K., EMMANOULOPOULOS D., ESPIGAT P., FARNIER C., FEINSTEIN F., FIASSON A., FORSTER A., FONTAINE G., FUSSLING M., GABICI S., GALLANT Y.A., GIEBELS B., GLICENSTEIN J.F., GLUCK B., GORET P., HADJICHRISTIDIS C., HAUSER D., HAUSER M., HEINZELMANN G., HENRI G., HERMANN G., HINTON J.A., HOFFMANN A., HOFMANN W., HOLLERAN M., HOPPE S., HORNS D., JACHOLKOWSKA A., DE JAGER O.C., JUNG I., KATARZYNSKI K., KENDZIORRA E., KERSCHHAGGL M., KHANGULYAN D., KHELIFI B., KEOGH D., KOMIN N., KOSACK K., LAMANNA G., LATHAM I.J., LENAIN J.-P., LOHSE T., MARTIN J.M., MARTINEAU-HUYNH O., MARCOWITH A., MASTERSON C., MAURIN D., McCOMB T.J.L., MODERSKI R., MOULIN E., NAUMANN-GODO M., DE NAUROIS M., NEDBAL D., NEKRASSOV D., NOLAN S.J., OHM S., OLIVE J.-P., DE ONA WILHELMI E., ORFORD K.J., OSBORNE J.L., OSTROWSKI M., PANTER M., PEDALETTI G., PELLETIER G., PETRUCCI P.-O., PITA S., PUHLHOFER G., PUNCH M., QUIRRENBACH A., RAUBENHEIMER B.C., RAUE M., RAYNER S.M., RENAUD M., RIEGER F., RIPKEN J., ROB L., ROSIER-LEES S., ROWELL G., RUDAK B., RUPPEL J., SAHAKIAN V., SANTANGELO A., SCHLICKEISER R., SCHOCK F.M., SCHRODER R., SCHWANKE U., SCHWARZBURG S., SCHWEMMER S., SHALCHI A., SOL H., SPANGLER D., STAWARZ L., STEENKAMP R., STEGMANN C., SUPERINA G., TAM P.H., TAVERNET J.-P., TERRIER R., VAN ELDIK C., VASILEIADIS G., VENTER C., VIALLE J.P., VINCENT P., VIVIER M., VOLK H.J., VOLPE F., WAGNER S.J., WARD M., ZDZIARSKI A.A. and ZECH A.

Abstract (from CDS):

We report on the first completely simultaneous observation of a gamma-ray burst (GRB) using an array of Imaging Atmospheric Cherenkov Telescopes, which is sensitive to photons in the very high energy (VHE) γ-ray range (≳ 100 GeV). On 2006 June 2, the Swift Burst Alert Telescope (BAT) registered an unusually soft γ-ray burst (GRB 060602B). The burst position was under observation using the High Energy Stereoscopic System (HESS) at the time the burst occurred. Data were taken before, during, and after the burst. A total of 5 hr of observations were obtained during the night of 2006 June 2-3, and five additional hours were obtained over the next three nights. No VHE γ-ray signal was found during the period covered by the HESS observations. The 99% confidence level flux upper limit (> 1 TeV) for the prompt phase (9 s) of GRB 060602B is 2.9x10–9 erg/cm2/s. Due to the very soft BAT spectrum of the burst compared with other Swift GRBs and its proximity to the Galactic center, the burst is likely associated with a Galactic X-ray burster, although the possibility of it being a cosmological GRB cannot be ruled out. We discuss the implications of our flux limits in the context of these two bursting scenarios.

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Journal keyword(s): gamma rays: bursts - gamma rays: observations

Simbad objects: 7

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