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Aims: To investigate possible changes in the physical parameters of Mrk421 during its high state of activity using multiwavelength data. Methods: We have observed this source in bright state using High Altitude GAmma Ray (HAGAR) telescope array at energies above 250 GeV during February 13 - 19, 2010. Optical, X-ray and gamma-ray archival data are also used to obtain the SEDs and light curves.\nResults: Mrk421 was found to undergo one of its brightest flaring episodes on Febr"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1203.3850","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-17T10:09:12Z","cross_cats_sorted":[],"title_canon_sha256":"9fb73433ae6ef9d20013b2e24c89057cfa007eceb4796a356b1b052a63459459","abstract_canon_sha256":"d5ac87c5c1d85c3e49f747c0a9893512c2a565ce429d9985e896dd69f23eaa07"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:06.479710Z","signature_b64":"xOMj9G/mRYRmamydwfczB8a0MZhmRHYD/KnGzSI49/Rd65p2U0s84vJZbbASP7qo49jVIx6hor9RCMaGDBcfCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53fd2b6d969c34c4708bfd07a435f0b898fc41e2307c8a180b891e3f90e57977","last_reissued_at":"2026-05-18T01:58:06.479080Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:06.479080Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Multiwavelength study of TeV Blazar Mrk421 during giant flare","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Shukla, B. B. Singh, B. S. Acharya, G. C. Anupama, L. Saha, P. Bhattacharjee, P. R. Vishwanath, R. J. Britto, T. P. Prabhu, V. R. Chitnis","submitted_at":"2012-03-17T10:09:12Z","abstract_excerpt":"Context: The nearby (z=0.031) TeV blazar Mrk421 was reported to be in a high state of flux activity since November, 2009. Aims: To investigate possible changes in the physical parameters of Mrk421 during its high state of activity using multiwavelength data. Methods: We have observed this source in bright state using High Altitude GAmma Ray (HAGAR) telescope array at energies above 250 GeV during February 13 - 19, 2010. 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