2019ApJ...886L..33A

Query : 2019ApJ...886L..33A

2019ApJ...886L..33A - Astrophys. J., 886, L33-L33 (2019/December-1)

Bright Gamma-ray flares observed in GRB 131108A.

AJELLO M., ARIMOTO M., ASANO K., AXELSSON M., BALDINI L., BARBIELLINI G., BASTIERI D., BELLAZZINI R., BERRETTA A., BISSALDI E., BLANDFORD R.D., BONINO R., BOTTACINI E., BREGEON J., BRUEL P., BUEHLER R., BUSON S., CAMERON R.A., CAPUTO R., CARAVEO P.A., CAVAZZUTI E., CHEN S., CHIARO G., CIPRINI S., COSTANTIN D., CUTINI S., D'AMMANDO F., DE LA TORRE LUQUE P., DE PALMA F., DI LALLA N., DI VENERE L., FANA DIRIRSA F., FEGAN S.J., FRANCKOWIAK A., FUKAZAWA Y., FUSCO P., GARGANO F., GASPARRINI D., GIGLIETTO N., GIORDANO F., GIROLETTI M., GREEN D., GRENIER I.A., GRONDIN M.-H., GUIRIEC S., HAYS E., HORAN D., JOHANNESSON G., KOCEVSKI D., KOVAC'EVIC' M., KUSS M., LARSSON S., LATRONICO L., LI J., LIODAKIS I., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MALDERA S., MANFREDA A., MARTI-DEVESA G., MAZZIOTTA M.N., McENERY J.E., MEREU I., MICHELSON P.F., MIZUNO T., MONZANI M.E., MORETTI E., MORSELLI A., MOSKALENKO I.V., NEGRO M., NUSS E., OHNO M., OMODEI N., ORIENTI M., ORLANDO E., PALATIELLO M., PALIYA V.S., PANEQUE D., PEI Z., PERSIC M., PESCE-ROLLINS M., PETROSIAN V., PIRON F., POON H., PORTER T.A., PRINCIPE G., RACUSIN J.L., RAINO S., RANDO R., RANI B., RAZZANO M., REIMER A., REIMER O., SERINI D., SGRO C., SISKIND E.J., SPANDRE G., SPINELLI P., TAJIMA H., TAKAGI K., TAK D., TORRES D.F., VALVERDE J., WOOD K., YAMAZAKI R., YASSINE M., ZHU S., UHM Z.L. and ZHANG B.

Abstract (from CDS):

GRB 131108A is a bright long gamma-ray burst (GRB) detected by the Large Area Telescope and the Gamma-ray Burst Monitor on board the Fermi Gamma-ray Space Telescope. Dedicated temporal and spectral analyses reveal three γ-ray flares dominating above 100 MeV, which are not directly related to the prompt emission in the Gamma-ray Burst Monitor band (10 keV-10 MeV). The high-energy light curve of GRB 131108A (100 MeV-10 GeV) shows an unusual evolution: a steep decay, followed by three flares with an underlying emission, and then a long-lasting decay phase. The detailed analysis of the γ-ray flares finds that the three flares are 6-20 times brighter than the underlying emission and are similar to each other. The fluence of each flare, (1.6 ∼ 2.0) x 10–6 erg cm–2, is comparable to that of emission during the steep decay phase, 1.7 x 10–6 erg cm–2. The total fluence from three γ-ray flares is 5.3 x 10–6 erg cm–2. The three γ-ray flares show properties similar to the usual X-ray flares that are sharp flux increases, occurring in ∼50% of afterglows, in some cases well after the prompt emission. Also, the temporal and spectral indices during the early steep decay phase and the decaying phase of each flare show the consistency with a relation of the curvature effect (1= 2 + 1), which is the first observational evidence of the high-latitude emission in the GeV energy band.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-ray bursts

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 - 2026 		#notes
1 GRB 050406 gB 02 17 52.200 -50 11 15.81     18.83     ~ 125 0
2 GRB 050502B gB 09 30 10.024 +16 59 48.07           ~ 169 0
3 GRB 131108A gB 10 26 00.480 +09 39 44.05           ~ 96 0

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