An Optically Dark GRB Observed by HETE-2: GRB 051022 | Zendy

Y. E. Nakagawa | Zendy; A. Yoshida | Zendy; Satoshi Sugita | Zendy; Kaoru Tanaka | Zendy; Nobuyuki Ishikawa | Zendy; Toru Tamagawa | Zendy; Motoko Suzuki | Zendy; Y. Shirasaki | Zendy; N. Kawai | Zendy; Masaru Matsuoka | Zendy; J. L. Atteia | Zendy; A. Pélangeon | Zendy; R. Vanderspek | Zendy; G. Crew | Zendy; Joel S. Villasenor | Zendy; N. Butler | Zendy; J. Doty | Zendy; G. Ricker | Zendy; G. Pizzichini | Zendy; T. Donaghy | Zendy; Donald Q. Lamb | Zendy; C. Graziani | Zendy; Rie Sato | Zendy; M. Maetou | Zendy; M. Arimoto | Zendy; J. Kotoku | Zendy; J. G. Jernigan | Zendy; T. Sakamoto | Zendy; Jean-François Olive | Zendy; M. Boër | Zendy; E. E. Fenimore | Zendy; M. Galassi | Zendy; Stanford E. Woosley | Zendy; M. Yamauchi | Zendy; Kunio Takagishi | Zendy; Isamu Hatsukade | Zendy

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An Optically Dark GRB Observed by HETE-2: GRB 051022

Author(s) -

Y. E. Nakagawa,

A. Yoshida,

Satoshi Sugita,

Kaoru Tanaka,

Nobuyuki Ishikawa,

Toru Tamagawa,

Motoko Suzuki,

Y. Shirasaki,

N. Kawai,

Masaru Matsuoka,

J. L. Atteia,

A. Pélangeon,

R. Vanderspek,

G. Crew,

Joel S. Villasenor,

N. Butler,

J. Doty,

G. Ricker,

G. Pizzichini,

T. Donaghy,

Donald Q. Lamb,

C. Graziani,

Rie Sato,

M. Maetou,

M. Arimoto,

J. Kotoku,

J. G. Jernigan,

T. Sakamoto,

Jean-François Olive,

M. Boër,

E. E. Fenimore,

M. Galassi,

Stanford E. Woosley,

M. Yamauchi,

Kunio Takagishi,

Isamu Hatsukade

Publication year - 2006

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/58.4.l35

Subject(s) - afterglow , physics , gamma ray burst , astrophysics , redshift , galaxy , extinction (optical mineralogy) , astronomy , absorption (acoustics) , optics

GRB 051022 was detected at 13:07:58 on 22 October 2005 by HETE-2. Thelocation of GRB 051022 was determined immediately by the flight localizationsystem. This burst contains multiple pulses and has a rather long duration ofabout 190 seconds. The detections of candidate X-ray and radio afterglows werereported, whereas no optical afterglow was found. The optical spectroscopicobservations of the host galaxy revealed the redshift z = 0.8. Using the dataderived by HETE-2 observation of the prompt emission, we found the absorptionN_H = 8.8 -2.9/+3.1 x 10^22 cm^-2 and the visual extinction A_V = 49 -16/+17mag in the host galaxy. If this is the case, no detection of any opticaltransient would be quite reasonable. The absorption derived by the Swift XRTobservations of the afterglow is fully consistent with those obtained from theearly HETE-2 observation of the prompt emission. Our analysis implies aninterpretation that the absorbing medium could be outside external shock at R ~10^16 cm, which may be a dusty molecular cloud.Comment: 6 pages, 2 figures, accepted for publication in PASJ lette

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