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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"

11612 results found.

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

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