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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"

11632 results found.

  1. GRB 231123C: Fermi GBM Final Real-time Localization
  2. GRB 231123B: Fermi GBM Final Real-time Localization
  3. Fermi trigger No 722400249: Global MASTER-Net observations report
  4. GRB 231118A: REM optical afterglow detection
  5. GRB 231123A: Fermi GBM Final Real-time Localization
  6. GRB 231122B: Glowbug gamma-ray detection
  7. Fermi trigger No 722349867: Global MASTER-Net observations report
  8. GRB 231122A: GECAM detection
  9. GRB 231122B: GECAM detection
  10. GRB 231122A: Fermi GBM Final Real-time Localization
  11. GRB 231118A: ATCA detection of radio counterpart
  12. GRB 231118A: GRBAlpha detection
  13. GRB 231118A: VZLUSAT-2 detection
  14. Konus-Wind detection of GRB 231020A
  15. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  16. GRB 231118B: Fermi GBM observation
  17. GRB 231118A: Fermi GBM observation
  18. GRB 231120A: Fermi GBM Final Real-time Localization
  19. GRB 231118A: VLT/X-shooter redshift
  20. Fermi trigger No 722039659: Global MASTER-Net observations report
  21. GRB 231118A: AstroSat CZTI detection
  22. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor
  23. GRB 231118A: Las Cumbres optical detection
  24. GRB 231118B: BALROG localization (Fermi Trigger 722039659 / GRB 231118940)
  25. GRB 231118B: Fermi GBM Final Real-time Localization
  26. GRB 231118A: LCOGT Optical Observations
  27. GRB 231118A: MASTER OT observation
  28. GRB 231118A: Fermi GBM Final Real-time Localization
  29. GRB 231115A: Wendelstein Optical/Infrared Observations
  30. GRB 231115A: JinShan optical upper limits
  31. GRB 231115A : OHP/T120 optical upper limit
  32. GRB 231115A: optical observations from INAF observatories
  33. GRB 231115A: Non-detection of radio emission with CHIME/FRB
  34. GRB231115A: Liverpool Telescope imaging
  35. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  36. Fermi GRB 231116A: Global MASTER-Net observations report
  37. Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)
  38. GRB 231115A: AGILE/MCAL upper limits
  39. GRB 231115A: Insight-HXMT/HE detection
  40. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  41. GRB 231116A: Fermi GBM Final Real-time Localization
  42. GRB 231115A : MITSuME Akeno and Okayama optical upper limits
  43. GRB 231115A: Gaoyazi/GOT follow-up and archival observations
  44. GRB 231115A: Upper limits from a neutrino search with IceCube
  45. GRB 231115A: Kinder observations with Lulin observatory
  46. GRB231115A: GRANDMA Observations
  47. GRB 231115A: GOTO pre-burst limits of AT2023xvj
  48. GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA
  49. GRB 231106A: TESS identification of candidate optical counterpart
  50. GRB 231115A: MASTER optical observations
  51. GRB 231115A (short): Glowbug gamma-ray detection
  52. GRB 231115A: Fermi Observations of a probable Magnetar Giant Flare from M82
  53. GRB 231115A: GROWTH-India discovery of a potential optical counterpart
  54. Fermi GRB 231115A: Global MASTER-Net observations report
  55. GRB 231115A: a short hard GRB detected by IBAS, poistionally coincident with M82
  56. GRB 231115A position consistent with M 82 galaxy
  57. GRB 231115A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 231114A: Global MASTER-Net observations report
  59. GRB 231114A (short): Glowbug gamma-ray detection
  60. GECAM-B observation of a short burst from SGR J1555-5402
  61. GRB 231114A: Fermi GBM Final Localization
  62. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  63. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  64. GRB 231106A: Glowbug gamma-ray detection
  65. GRB 231104A: VZLUSAT-2 detection
  66. GRB 231109A: Fermi GBM Final Localization
  67. Fermi trigger No 721204446: Global MASTER-Net observations report
  68. Fermi GRB 231108A: Global MASTER-Net observations report
  69. GRB 231108A: Fermi GBM Final Real-time Localization
  70. GRB 231106A: AstroSat CZTI detection
  71. GRB 231106A: CALET Gamma-Ray Burst Monitor detection
  72. Fermi trigger No 721006392: Global MASTER-Net observations report
  73. Fermi Gamma-ray Burst Monitor trigger 231107654 / 721064512 is not a GRB
  74. GRB 231104A: FRAM-ORM optical limit
  75. Fermi GRB 231106A: Global MASTER-Net observations report
  76. GRB 231104A: Wendelstein Optical/Infrared Observations
  77. GRB 231104A: NuSTAR Observation of the prompt emission
  78. GRB 231106A: Fermi GBM Final Real-time Localization
  79. GRB 231104A: 3.6m DOT optical upper limit
  80. Fermi-LAT gamma-ray observations of IceCube-231103A
  81. GRB 231104A: NOT upper limit
  82. GRB 231104A: Fermi GBM Observation
  83. GRB 231104B: Fermi GBM Final Real-time Localization
  84. Fermi GRB 231103A: Global MASTER-Net observations report
  85. GRB 231104A: AKO Upper Limit
  86. GRB 231104A: AstroSat CZTI detection
  87. GRB 231104A: Fermi-LAT detection
  88. GRB231104A: LCOGT Optical Upper Limits
  89. GRB 231104A: Fermi GBM Final Real-time Localization
  90. GRB 231103A: Fermi GBM Final Real-time Localization
  91. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  92. Fermi-LAT gamma-ray observations of IceCube-231027A
  93. GRB 231101A: Glowbug gamma-ray detection
  94. Fermi trigger No 720498201: Global MASTER-Net observations report
  95. GRB 231101A: Fermi GBM Final Real-time Localization
  96. GRB 231030B: GRBAlpha detection
  97. GRB 231028B: VZLUSAT-2 detection
  98. Fermi trigger No 720415645: Global MASTER-Net observations report
  99. GRB 231030B: Fermi GBM Detection
  100. GRB 231030B: AstroSat CZTI detection

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