Search for Gamma Ray Bursts with the ARGO-YBJ Detector in Shower Mode
Authors:
B. Bartoli,
P. Bernardini,
X. J. Bi,
Z. Cao,
S. Catalanotti,
S. Z. Chen,
T. L. Chen,
S. W. Cui,
B. Z. Dai,
A. D Amone,
Danzeng Luobu,
I. De Mitri,
B. D Ettorre Piazzoli,
T. Di Girolamo,
G. Di Sciascio,
C. F. Feng,
Zhaoyang Feng,
Zhenyong Feng,
W. Gao,
Q. B. Gou,
Y. Q. Guo,
H. H. He,
Haibing Hu,
Hongbo Hu,
M. Iacovacci
, et al. (47 additional authors not shown)
Abstract:
The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a full coverage air shower array dedicated to gamma ray astronomy and cosmic ray studies. The wide field of view (~ 2 sr) and high duty cycle (> 86%), made ARGO-YBJ suitable to search for short and unexpected gamma ray emissions like gamma ray bursts (GRBs). Between 2007 November 6 and 2013…
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The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a full coverage air shower array dedicated to gamma ray astronomy and cosmic ray studies. The wide field of view (~ 2 sr) and high duty cycle (> 86%), made ARGO-YBJ suitable to search for short and unexpected gamma ray emissions like gamma ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view. A search for possible emission associated to these GRBs has been made in the two energy ranges 10-100 GeV and 10-1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a time window of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at 99% of confidence level have been evaluated,with values ranging from ~ 10-5 erg cm-2 to ~10-1 erg cm-2.
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Submitted 23 March, 2017;
originally announced March 2017.
Study of the diffuse gamma-ray emission from the Galactic plane with ARGO-YBJ
Authors:
B. Bartoli,
P. Bernardini,
X. J. Bi,
P. Branchini,
A. Budano,
P. Camarri,
Z. Cao,
R. Cardarelli,
S. Catalanotti,
S. Z. Chen,
T. L. Chen,
P. Creti,
S. W. Cui,
B. Z. Dai,
A. D'Amone,
Danzengluobu,
I. De Mitri,
B. D'Ettorre Piazzoli,
T. Di Girolamo,
G. Di Sciascio,
C. F. Feng,
Zhaoyang Feng,
Zhenyong Feng,
Q. B. Gou,
Y. Q. Guo
, et al. (56 additional authors not shown)
Abstract:
The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission in the Galactic plane at Galactic longitudes 25° < l < 100° and Galactic latitudes . The energy range covered by this analysis, from ~350 GeV to ~2 TeV, allows the connection of the region explored by Fermi with the multi-TeV measurements carried out by Milagro.…
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The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission in the Galactic plane at Galactic longitudes 25° < l < 100° and Galactic latitudes . The energy range covered by this analysis, from ~350 GeV to ~2 TeV, allows the connection of the region explored by Fermi with the multi-TeV measurements carried out by Milagro. Our analysis has been focused on two selected regions of the Galactic plane, i.e., 40° < l < 100° and 65° < l < 85° (the Cygnus region), where Milagro observed an excess with respect to the predictions of current models. Great care has been taken in order to mask the most intense gamma-ray sources, including the TeV counterpart of the Cygnus cocoon recently identified by ARGO-YBJ, and to remove residual contributions. The ARGO-YBJ results do not show any excess at sub-TeV energies corresponding to the excess found by Milagro, and are consistent with the predictions of the Fermi model for the diffuse Galactic emission. From the measured energy distribution we derive spectral indices and the differential flux at 1 TeV of the diffuse gamma-ray emission in the sky regions investigated.
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Submitted 24 July, 2015;
originally announced July 2015.