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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"

11623 results found.

  1. GRB 240605C: Fermi GBM Final Real-time Localization
  2. IPN triangulation of GRB 240603A
  3. GRB 240605B: Fermi GBM Final Real-time Localization
  4. GRB 240604A: Fermi GBM Final Localization
  5. GRB 240605A: Fermi GBM Final Real-time Localization
  6. Fermi GRB 240603C: Global MASTER-Net observations report
  7. GRB 240603A: Fermi GBM Final Localization
  8. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  9. GRB 240603C: Fermi GBM Final Real-time Localization
  10. Fermi GRB 240602A: Global MASTER-Net observations report
  11. GRB 240602A: Fermi GBM Final Real-time Localization
  12. GRB 240527B: Swift-XRT afterglow detection
  13. GRB 240527B: Fermi GBM Observation
  14. Fermi GRB 240527A: Global MASTER-Net observations report
  15. GRB 240527B: Fermi-LAT detection
  16. Fermi GRB 240527B: Global MASTER-Net observations report
  17. GRB 240527B: Fermi GBM Final Localization
  18. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  19. GRB 240527A: Fermi GBM Final Real-time Localization
  20. Fermi trigger No 738348224: Global MASTER-Net observations report
  21. Fermi trigger No 738330463: Global MASTER-Net observations report
  22. GRB 240521B: Fermi GBM Observation
  23. Fermi GBM Sub-Threshold Detection of GRB 240516B
  24. GRB 240513A: Swift-XRT afterglow detection
  25. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  26. Fermi trigger No 737996942: Global MASTER-Net observations report
  27. GRB 240516B: AstroSat CZTI detection
  28. GRB 240514B: VZLUSAT-2 detection
  29. GRB 240504A: VZLUSAT-2 detection
  30. GRB 240502A: VZLUSAT-2 detection
  31. GRB 240519A: GRBAlpha detection
  32. GRB 240519A: AstroSat CZTI detection
  33. Fermi trigger No 737788024: Global MASTER-Net observations report
  34. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  35. Fermi GRB 240517A: Global MASTER-Net observations report
  36. GRB 240516A ATCA radio observations
  37. IPN triangulation of GRB 240514B (short)
  38. GRB 240513A: Swift ToO observations
  39. GRB 240517A: Fermi GBM Final Real-time Localization
  40. Konus-Wind detection of GRB 240513A
  41. GRB 240516A: AstroSat CZTI detection
  42. Fermi trigger No 737559855: Global MASTER-Net observations report
  43. GRB 240516A: Fermi GBM Observation
  44. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  45. GRB 240516A: GOTO optical upper limit
  46. Fermi trigger No 737523389: Global MASTER-Net observations report
  47. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  48. Fermi trigger No 737476171: Global MASTER-Net observations report
  49. GRB 240514B: GOTO candidate optical counterpart
  50. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  51. GRB 240514B: GRBAlpha detection
  52. GRB 240514B: Fermi GBM Detection
  53. GRB 240513A: Fermi GBM observation
  54. GRB 240513A: Swift-XRT observations
  55. GRB 240514C: Fermi GBM Final Real-time Localization
  56. Fermi GRB 240514B: Global MASTER-Net observations report
  57. Fermi Gamma-ray Burst Monitor triggers 737345659/240514093 and GRB240514A are not GRBs
  58. GRB 240514B: Fermi GBM Final Real-time Localization
  59. GRB 240514A: Fermi GBM Final Real-time Localization
  60. GRB 240513A: Tiled Swift observations
  61. GRB 240513A: Fermi-LAT detection
  62. GRB 240511A: Fermi GBM Observation
  63. Fermi GRB 240513B: Global MASTER-Net observations report
  64. Fermi trigger No 737277727: Global MASTER-Net observations report
  65. GRB 240513B: Fermi GBM Final Real-time Localization
  66. GRB 240513A: AstroSat CZTI detection
  67. Fermi trigger No 737258655: Global MASTER-Net observations report
  68. GRB 240511A: J-band observations with WINTER
  69. Fermi trigger No 737247400: Global MASTER-Net observations report
  70. Fermi trigger No 737244199: Global MASTER-Net observations report
  71. Fermi trigger No 737218721: Global MASTER-Net observations report
  72. Fermi trigger No 737196587: Global MASTER-Net observations report
  73. Fermi trigger No 737168073: Global MASTER-Net observations report
  74. GRB 240511A : MITSuME Akeno optical upper limits
  75. GRB 240511A: optical afterglow detection from the NOT
  76. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  77. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  78. Fermi GBM trigger 737105243/240511311 is not a GRB
  79. Fermi trigger No 737173236: Global MASTER-Net observations report
  80. Fermi GRB 240511A: Global MASTER-Net observations report
  81. Fermi trigger No 737105243: Global MASTER-Net observations report
  82. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  83. Fermi trigger No 737152719: Global MASTER-Net observations report
  84. GRB 240511A: Fermi GBM Final Real-time Localization
  85. Fermi trigger No 737102480: Global MASTER-Net observations report
  86. Fermi trigger No 737111207: Global MASTER-Net observations report
  87. Fermi Gamma-ray Burst Monitor trigger 737076431/240510977 is not a GRB
  88. Fermi trigger No 736967879: Global MASTER-Net observations report
  89. Fermi Gamma-ray Burst Monitor trigger 230925241/717313591 is not a GRB
  90. GRB 240504A: Fermi GBM Observation
  91. Fermi Gamma-ray Burst Monitor trigger 736837160/240508208 is not a GRB
  92. Fermi trigger No 736733320: Global MASTER-Net observations report
  93. IPN triangulation of GRB 240504A
  94. GRB 240504A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  95. Fermi GBM triggers 736668287/240506253 and 736669277/240506265 are not GRBs
  96. Fermi trigger No 736564880: Global MASTER-Net observations report
  97. IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
  98. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  99. Fermi trigger No 736461232: Global MASTER-Net observations report
  100. IPN triangulation of GRB 240501B and GRB 240501A - possible episodes of ultra long GRB

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