TY - GEN
T1 - Unprecedented gamma-ray flare from PG1553+113 in spring 2012
AU - Becerra-González, J.
AU - Da Vela, P.
AU - Prandini, E.
AU - Stamerra, A.
AU - Covino, S.
AU - Barres, U.
AU - Nilsson, K.
AU - Lähteenmäki, A.
AU - Hovatta, T.
AU - Mundell, C.
AU - Steele, I.
AU - Neronov, A.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - PG1553 is a well-known TeV blazar, which redshift is still uncertain (z>0.4 [1]). The source has been monitored in Very High Energy (VHE, E>100 GeV) gamma-rays by MAGIC telescopes since February 2005, and detected on a regular basis in a quiescent state with modest flux variations, lying in the range from 4% to 11% of the Crab Nebula flux above 150 GeV [2]. In March and April 2012, strong VHE gamma ray activity was detected with the MAGIC telescopes. The flux state reached unprecedented level of the Crab Nebula flux for PG 1553+113 [3]. A multiwavlength campaign during the flaring episodes has been carried out in radio by Metsähovi and OVRO, in optical by KVA telescope, in optical-UV by Swift/UVOT, in X-rays by Swift/XRT, in infrared by REM telescope and in gamma-rays by Fermi/LAT. In addition, optical polarization measurements were carried out by Liverpool telescope. The multiwavelength behavior is particularly interesting, since the source was active in most of the bands.
AB - PG1553 is a well-known TeV blazar, which redshift is still uncertain (z>0.4 [1]). The source has been monitored in Very High Energy (VHE, E>100 GeV) gamma-rays by MAGIC telescopes since February 2005, and detected on a regular basis in a quiescent state with modest flux variations, lying in the range from 4% to 11% of the Crab Nebula flux above 150 GeV [2]. In March and April 2012, strong VHE gamma ray activity was detected with the MAGIC telescopes. The flux state reached unprecedented level of the Crab Nebula flux for PG 1553+113 [3]. A multiwavlength campaign during the flaring episodes has been carried out in radio by Metsähovi and OVRO, in optical by KVA telescope, in optical-UV by Swift/UVOT, in X-rays by Swift/XRT, in infrared by REM telescope and in gamma-rays by Fermi/LAT. In addition, optical polarization measurements were carried out by Liverpool telescope. The multiwavelength behavior is particularly interesting, since the source was active in most of the bands.
KW - Galaxies-BL Lacertae objects
KW - Gamma-rays
KW - Individual
KW - PG1553+113
UR - http://www.scopus.com/inward/record.url?scp=84873109125&partnerID=8YFLogxK
U2 - 10.1063/1.4772322
DO - 10.1063/1.4772322
M3 - Chapter in a published conference proceeding
AN - SCOPUS:84873109125
SN - 9780735411234
T3 - AIP Conference Proceedings
SP - 562
EP - 565
BT - High Energy Gamma-Ray Astronomy - 5th International Meeting on High Energy Gamma-Ray Astronomy
T2 - 5th International Meeting on High Energy Gamma-Ray Astronomy
Y2 - 9 July 2012 through 13 July 2012
ER -