2014A&A...568A..75G

Query : 2014A&A...568A..75G

2014A&A...568A..75G - Astronomy and Astrophysics, volume 568A, 75-75 (2014/8-1)

GROND coverage of the main peak of gamma-ray burst 130925A.

GREINER J., YU H.-F., KRUEHLER T., FREDERIKS D.D., BELOBORODOV A., BHAT P.N., BOLMER J., VAN EERTEN H., APTEKAR R.L., ELLIOTT J., GOLENETSKII S.V., GRAHAM J.F., HURLEY K., KANN D.A., KLOSE S., NICUESA GUELBENZU A., RAU A., SCHADY P., SCHMIDL S., SUDILOVSKY V., SVINKIN D.S., TANGA M., ULANOV M.V., VARELA K., VON KIENLIN A. and ZHANG X.-L.

Abstract (from CDS):

Prompt or early optical emission in gamma-ray bursts (GRBs) is notoriously difficult to measure, and observations of the dozen cases show a large variety of properties. Yet, such early emission promises to help us achieve a better understanding of the GRB emission process(es). We performed dedicated observations of the ultra-long duration (T90 about 7000s) Swift GRB 130925A in the optical/near-infrared with the 7-channel Gamma-Ray burst Optical and Near-infrared Detector (GROND) at the 2.2m MPG/ESO telescope. We detect an optical/near-infrared flare with an amplitude of nearly 2mag which is delayed with respect to the keV-MeV prompt emission by about 300-400s. The decay time of this flare is shorter than the duration of the flare (500s) or its delay. While we cannot offer a straightforward explanation, we discuss the implications of the flare properties and suggest ways toward understanding it.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: stars - radiation mechanisms: non-thermal

VizieR on-line data: <Available at CDS (J/A+A/568/A75): g_ab.dat r_ab.dat i_ab.dat z_ab.dat j_ab.dat h_ab.dat k_ab.dat>

CDS comments: Table 1 Stars not in SIMBAD.

Simbad objects: 12

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Number of rows : 12
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 041219 gB 00 24 27.7 +62 50 34           ~ 225 1
2 SN 2011kl SN* 00 57 22.64 -46 48 03.6           SNSLSN 230 1
3 Fermi bn130925164 gB 02 44 42.38 -26 09 15.8           ~ 153 0
4 GRB 080129 gB 07 01 08.13 -07 50 47.8           ~ 79 0
5 Fermi bn121217313 gB 10 14 50.32 -62 21 03.3           ~ 60 0
6 GRB 030418 gB 10 54 33.69 -07 01 40.8           ~ 68 0
7 SN 2013cq SN* 11 32 32.84 +27 41 56.2           SNIc 512 1
8 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 467 0
9 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 989 1
10 GRB 110328A gB 16 44 49 +57 34.9           ~ 450 0
11 GRB 060111B gB 19 05 42.480 +70 22 33.60     17.55     ~ 85 1
12 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 386 0

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