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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

11610 results found.

  1. GRB 231118A: Las Cumbres optical detection
  2. GRB 231118B: BALROG localization (Fermi Trigger 722039659 / GRB 231118940)
  3. GRB 231118B: Fermi GBM Final Real-time Localization
  4. GRB 231118A: LCOGT Optical Observations
  5. GRB 231118A: MASTER OT observation
  6. GRB 231118A: Fermi GBM Final Real-time Localization
  7. GRB 231115A: Wendelstein Optical/Infrared Observations
  8. GRB 231115A: JinShan optical upper limits
  9. GRB 231115A : OHP/T120 optical upper limit
  10. GRB 231115A: optical observations from INAF observatories
  11. GRB 231115A: Non-detection of radio emission with CHIME/FRB
  12. GRB231115A: Liverpool Telescope imaging
  13. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  14. Fermi GRB 231116A: Global MASTER-Net observations report
  15. Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)
  16. GRB 231115A: AGILE/MCAL upper limits
  17. GRB 231115A: Insight-HXMT/HE detection
  18. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  19. GRB 231116A: Fermi GBM Final Real-time Localization
  20. GRB 231115A : MITSuME Akeno and Okayama optical upper limits
  21. GRB 231115A: Gaoyazi/GOT follow-up and archival observations
  22. GRB 231115A: Upper limits from a neutrino search with IceCube
  23. GRB 231115A: Kinder observations with Lulin observatory
  24. GRB231115A: GRANDMA Observations
  25. GRB 231115A: GOTO pre-burst limits of AT2023xvj
  26. GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA
  27. GRB 231106A: TESS identification of candidate optical counterpart
  28. GRB 231115A: MASTER optical observations
  29. GRB 231115A (short): Glowbug gamma-ray detection
  30. GRB 231115A: Fermi Observations of a probable Magnetar Giant Flare from M82
  31. GRB 231115A: GROWTH-India discovery of a potential optical counterpart
  32. Fermi GRB 231115A: Global MASTER-Net observations report
  33. GRB 231115A: a short hard GRB detected by IBAS, poistionally coincident with M82
  34. GRB 231115A position consistent with M 82 galaxy
  35. GRB 231115A: Fermi GBM Final Real-time Localization
  36. Fermi GRB 231114A: Global MASTER-Net observations report
  37. GRB 231114A (short): Glowbug gamma-ray detection
  38. GECAM-B observation of a short burst from SGR J1555-5402
  39. GRB 231114A: Fermi GBM Final Localization
  40. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  41. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  42. GRB 231106A: Glowbug gamma-ray detection
  43. GRB 231104A: VZLUSAT-2 detection
  44. GRB 231109A: Fermi GBM Final Localization
  45. Fermi trigger No 721204446: Global MASTER-Net observations report
  46. Fermi GRB 231108A: Global MASTER-Net observations report
  47. GRB 231108A: Fermi GBM Final Real-time Localization
  48. GRB 231106A: AstroSat CZTI detection
  49. GRB 231106A: CALET Gamma-Ray Burst Monitor detection
  50. Fermi trigger No 721006392: Global MASTER-Net observations report
  51. Fermi Gamma-ray Burst Monitor trigger 231107654 / 721064512 is not a GRB
  52. GRB 231104A: FRAM-ORM optical limit
  53. Fermi GRB 231106A: Global MASTER-Net observations report
  54. GRB 231104A: Wendelstein Optical/Infrared Observations
  55. GRB 231104A: NuSTAR Observation of the prompt emission
  56. GRB 231106A: Fermi GBM Final Real-time Localization
  57. GRB 231104A: 3.6m DOT optical upper limit
  58. Fermi-LAT gamma-ray observations of IceCube-231103A
  59. GRB 231104A: NOT upper limit
  60. GRB 231104A: Fermi GBM Observation
  61. GRB 231104B: Fermi GBM Final Real-time Localization
  62. Fermi GRB 231103A: Global MASTER-Net observations report
  63. GRB 231104A: AKO Upper Limit
  64. GRB 231104A: AstroSat CZTI detection
  65. GRB 231104A: Fermi-LAT detection
  66. GRB231104A: LCOGT Optical Upper Limits
  67. GRB 231104A: Fermi GBM Final Real-time Localization
  68. GRB 231103A: Fermi GBM Final Real-time Localization
  69. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  70. Fermi-LAT gamma-ray observations of IceCube-231027A
  71. GRB 231101A: Glowbug gamma-ray detection
  72. Fermi trigger No 720498201: Global MASTER-Net observations report
  73. GRB 231101A: Fermi GBM Final Real-time Localization
  74. GRB 231030B: GRBAlpha detection
  75. GRB 231028B: VZLUSAT-2 detection
  76. Fermi trigger No 720415645: Global MASTER-Net observations report
  77. GRB 231030B: Fermi GBM Detection
  78. GRB 231030B: AstroSat CZTI detection
  79. Fermi GRB 231030B: Global MASTER-Net observations report
  80. IPN triangulation of GRB 231020A
  81. GRB 231030B: BALROG localization (Fermi Trigger 720388704 / GRB 231030832)
  82. GRB 231030B: Fermi GBM Final Real-time Localization
  83. GRB 231024A: AKO Optical Counterpart Candidate
  84. GRB 231028A: CALET Gamma-Ray Burst Monitor detection
  85. Fermi GRB 231030A: Global MASTER-Net observations report
  86. GRB 231030A: Fermi GBM Final Real-time Localization
  87. GRID detection of GRB 231020A
  88. GRB 231028A: AstroSat CZTI detection
  89. GRB 231028A: Glowbug gamma-ray detection
  90. GRB 231028A: Fermi GBM Detection
  91. Fermi trigger No 720224759: Global MASTER-Net observations report
  92. GRB 231028A: Swift detection of a burst
  93. GRB 231028A: Fermi GBM Final Real-time Localization
  94. IceCube-231027A - IceCube observation of a high-energy neutrino candidate track-like event
  95. GRB 231019A: Glowbug gamma-ray detection
  96. GRB 231025A: Fermi GBM Observation
  97. GRB 231024A: Fermi GBM Observation
  98. GRB 231025A: Swift/BAT-GUANO detection of a likely short burst
  99. GRB 231025A: Fermi GBM Final Localization
  100. GRB 231024A: X-shooter spectroscopy of AT2023vuc/GOTO23baj reveals a young supernova with flash ionisation features

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