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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

2803 results found.

  1. IceCube-230306A - IceCube observation of a high-energy neutrino candidate
  2. GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit
  3. IceCube-230220A - IceCube observation of a high-energy neutrino candidate
  4. IceCube-230217A - IceCube observation of a high-energy neutrino candidate track-like event
  5. GRB 230216A: Swift-BAT refined analysis
  6. GRB 230216A: AKO Upper Limit
  7. GRB 230216A: Zadko observatory - Gingin optical observations
  8. GRB 230205A: SUBARU HSC pre-imaging for host galaxy search
  9. GRB 230205A: possible host galaxy detection with the Schmidt - Asiago telescope
  10. ZTF23aabmzlp/AT2023azs: Neil Gehrels Swift Observatory X-ray observations
  11. GRB 230204B: Swift-XRT afterglow detection
  12. GRB 230205A: OHP/T193 optical observations
  13. GRB 230204A/Swift J1552.8-5055: LCOGT Optical Counterpart Candidate
  14. GRB 230204A: Swift detection of a possible burst (or possible transient Swift J1552.8-5055)
  15. GRB 221216A: Swift-BAT refined analysis
  16. IceCube-230201A - IceCube observation of a high-energy neutrino candidate track-like event
  17. ZTF23aabmzlp/AT2023azs: Zwicky Transient Facility discovery of a fast optical transient
  18. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  19. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  20. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  21. ZTF22acaruqr/AT2022adzb: Neil Gehrels Swift Observatory X-ray detection
  22. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  23. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  24. IceCube-221216A - IceCube observation of a high-energy neutrino candidate track-like event
  25. IceCube-221210A - IceCube observation of a high-energy neutrino candidate track-like event
  26. IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event
  27. GRB 221120A: Archival PS1 Imaging of Faint Source near XRT position
  28. GRB 221120A: Swift detection of a likely short burst
  29. IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event
  30. GRB 221024A: Swift-BAT refined analysis
  31. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  32. GRB 221016A: z-band upper limit, possible afterglow brightening
  33. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  34. MAXI GRB 221006A: Redshifts of the possible host galaxies
  35. Afterglow limits of GRB 221006A from OHP
  36. GRB 221009A: Swift detected transient may be GRB
  37. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  38. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  39. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  40. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  41. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  42. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  43. GRB 220831A: DECam detection of a possible optical counterpart
  44. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  45. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  46. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  47. GRB 220813A: VLT optical observations and possible host galaxy
  48. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  49. GRB 220714A: Possible Swift detection of a burst
  50. IceCube-220624A: Classification of AT2022nit as a type Ia supernova and AT2021bei as an AGN
  51. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  52. Konus-Wind detection of GRB 220627A
  53. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  54. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  55. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  56. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  57. GRB 220623A: Swift-BAT refined analysis
  58. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  59. GRB 220611A: Gemini Ks counterpart detection
  60. GRB 220611A: Swift-BAT refined analysis
  61. GRB 220527A: VLT/X-shooter spectroscopic redshift
  62. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  63. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  64. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  65. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  66. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  67. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  68. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  69. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  70. GRB 220408A: redshift lower limit estimating
  71. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  72. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  73. GRB 220403B: Swift detection of a burst with an optical counterpart
  74. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  75. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  76. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  77. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  78. GRB 220306B: AbAO optical observations, possible afterglow candidate
  79. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  80. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  81. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  82. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  83. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  84. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  85. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  86. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  87. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  88. GRB 220211A: redshift lower limit estimating
  89. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  90. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  91. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  92. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  93. Swift currently in safe hold with science slews disabled
  94. IceCube-220115A - IceCube observation of a high-energy neutrino candidate track-like event
  95. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  96. GRB 211227A: A possible short GRB with extended emission at z = 0.228?
  97. IceCube-211216B - IceCube observation of a high-energy neutrino candidate track-like event
  98. IceCube-211216A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 211211A - Gemini K-band detection
  100. GRB 211211A: redshift estimation and SPI-ACS/INTEGRAL detection

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