2010A&A...517A...5A

Query : 2010A&A...517A...5A

2010A&A...517A...5A - Astronomy and Astrophysics, volume 517, A5-5 (2010/7-1)

MAGIC observation of the GRB 080430 afterglow.

ALEKSIC J., ANDERHUB H., ANTONELLI L.A., ANTORANZ P., BACKES M., BAIXERAS C., BALESTRA S., BARRIO J.A., BASTIERI D., BECERRA GONZALEZ J., BECKER J.K., BEDNAREK W., BERDYUGIN A., BERGER K., BERNARDINI E., BILAND A., BOCK R.K., BONNOLI G., BORDAS P., BORLA TRIDON D., BOSCH-RAMON V., BOSE D., BRAUN I., BRETZ T., BRITZGER D., CAMARA M., CARMONA E., CAROSI A., COLIN P., COMMICHAU S., CONTRERAS J.L., CORTINA J., COSTADO M.T., COVINO S., DAZZI F., DE ANGELIS A., DE CEA DEL POZO E., DE LOS REYES R., DE LOTTO B., DE MARIA M., DE SABATA F., DELGADO MENDEZ C., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., ELSAESSER D., ERRANDO M., FERENC D., FERNANDEZ E., FIRPO R., FONSECA M.V., FONT L., GALANTE N., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GODINOVIC N., GOEBEL F., HADASCH D., HERRERO A., HILDEBRAND D., HOEHNE-MOENCH D., HOSE J., HRUPEC D., HSU C.C., JOGLER T., KLEPSER S., KRAEHENBUEHL T., KRANICH D., LA BARBERA A., LAILLE A., LEONARDO E., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LORENZ E., MAJUMDAR P., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MIYAMOTO H., MOLDON J., MOLES M., MORALEJO A., NIETO D., NILSSON K., NINKOVIC J., ORITO R., OYA I., PAOLETTI R., PAREDES J.M., PASANEN M., PASCOLI D., PAUSS F., PEGNA R.G., PEREZ-TORRES M.A., PERSIC M., PERUZZO L., PRADA F., PRANDINI E., PUCHADES N., PULJAK I., REICHARDT I., RHODE W., RIBO M., RICO J., RISSI M., RUEGAMER S., SAGGION A., SAITO T.Y., SALVATI M., SANCHEZ-CONDE M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHWEIZER T., SHAYDUK M., SHORE S.N., SIERPOWSKA-BARTOSIK A., SILLANPAEAE A., SITAREK J., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMERRA A., STEINKE B., STRAH N., STRUEBIG J.C., SURIC T., TAKALO L., TAVECCHIO F., TEMNIKOV P., TESCARO D., TESHIMA M., TORRES D.F., TURINI N., VANKOV H., WAGNER R.M., ZABALZA V., ZANDANEL F., ZANIN R., ZAPATERO J. and DE UGARTE POSTIGO A.

Abstract (from CDS):

Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted to the study of gamma-ray bursts during the prompt phase, i.e. the initial burst of high-energy radiation, and during the long-lasting afterglows. In spite of many successes in interpreting these phenomena, there are still several open key questions about the fundamental emission processes, their energetics and the environment. Independently of specific gamma-ray burst theoretical recipes, spectra in the GeV/TeV range are predicted to be remarkably simple, being satisfactorily modeled with power-laws, and therefore offer a very valuable tool to probe the extragalactic background light distribution. Furthermore, the simple detection of a component at very-high energies, i.e. at ∼100GeV, would solve the ambiguity about the importance of various possible emission processes, which provide barely distinguishable scenarios at lower energies. We used the results of the MAGIC telescope observation of the moderate resdhift (z∼0.76) GRB080430 at energies above about 80GeV, to evaluate the perspective for late-afterglow observations with ground based GeV/TeV telescopes. We obtained an upper limit of F95%CL=5.5x10–11erg/cm2/s for the very-high energy emission of GRB080430, which cannot set further constraints on the theoretical scenarios proposed for this object also due to the difficulties in modeling the low-energy afterglow. Nonetheless, our observations show that Cherenkov telescopes have already reached the required sensitivity to detect the GeV/TeV emission of GRBs at moderate redshift (z≲0.8), provided the observations are carried out at early times, close to the onset of their afterglow phase.

Abstract Copyright: ∼

Journal keyword(s): radiation mechanisms: non-thermal - gamma-ray burst: individual: GRB 080430

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 GRB 080430 gB 11 01 14.63 +51 41 07.8           ~ 142 0
2 Fermi bn090902462 gB 17 39 45.26 +27 19 28.1           ~ 391 0
3 GRB 090510 gB 22 14 12.60 -26 35 51.1           ~ 494 1

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