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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"

36400 results found.

  1. Swift GRB 220826A: Global MASTER-Net observations report
  2. GRB 220826A: Enhanced Swift-XRT position
  3. GRB 220826A: Swift detection of a burst with an optical counterpart
  4. GRB 220825A: Swift/BAT-GUANO detection
  5. GRB 220825A: Fermi GBM Final Localization
  6. GRB 220823A: Fermi GBM detection
  7. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  8. GRB 220821A: Fermi GBM Final Real-time Localization
  9. Konus-Wind detection of GRB 220813A
  10. GRB 220813A: VLT optical observations and possible host galaxy
  11. GRB 220813A: Swift/UVOT Detection
  12. GRB 220810A: Further Swift-XRT observations
  13. GRB 220813A: Swift-XRT refined Analysis
  14. Swift GRB 220813A: Global MASTER-Net observations report
  15. GRB 220813A: Enhanced Swift-XRT position
  16. GRB 220813A: Swift detection of a burst with an optical counterpart
  17. GRB 220810A: Swift-XRT observations
  18. GRB 220719B: Detection by VZLUSAT-2
  19. GRB 220810A: Swift ToO observations
  20. GRB 220810A: MeerLICHT detection of two afterglow candidates
  21. Fermi GBM trigger 681998863/220812505 is not a GRB
  22. Fermi GBM trigger 681890304/220811249 is not a GRB
  23. Fermi GRB 220810A: Global MASTER-Net observations report
  24. GRB 220810A: Fermi GBM Final Real-time Localization
  25. GRB 220627A: MeerKAT radio observations
  26. GRB 220806A: Swift-BAT refined analysis
  27. Fermi GBM trigger 681719116/220809267 is not a GRB
  28. Fermi GBM trigger 681633544/220808277 is not a GRB
  29. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  30. GRB 220806A: Swift detection of a burst
  31. GRB 220804A: Fermi GBM Final Localization
  32. GRB 220803A: AstroSat CZTI detection
  33. Konus-Wind detection of GRB 220730A (short)
  34. GRB 220730A: Swift-BAT refined analysis
  35. GRB 220730A: Fermi GBM detection
  36. GRB 220730A: Swift-XRT afterglow detection
  37. GRB 220730A: Swift/UVOT Upper Limits
  38. GRB 220730A: Swift-XRT observations
  39. GRB 220729A: AstroSat CZTI detection
  40. Swift GRB 220730A: Global MASTER-Net observations report
  41. GRB 220730A: Swift detection of a short hard burst
  42. Fermi GRB 220728A: Global MASTER-Net observations report
  43. GRB 220728A: Fermi GBM Final Real-time Localization
  44. GRB 220726A: Fermi GBM Final Real-time Localization
  45. Fermi GRB 220724A: Global MASTER-Net observations report
  46. GRB 220724A: Fermi GBM Final Real-time Localization
  47. GRB 220715B: VIRT Optical Upper Limit
  48. Fermi GRB 220721A: Global MASTER-Net observations report
  49. GRB 220721A: Fermi GBM Final Real-time Localization
  50. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  51. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  52. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  53. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  54. GRB 220719A: Fermi GBM Final Real-time Localization
  55. GRB 220715B: Swift-BAT refined analysis
  56. GRB220714B: UVOT detections
  57. GRB 220715B: Fermi GBM detection
  58. GRB 220715B: Swift-XRT refined Analysis
  59. GRB 220715B: Swift/UVOT Upper Limits
  60. GRB 220715B: Enhanced Swift-XRT position
  61. GRB 220715B: BOOTES-network optical upper limits
  62. Swift GRB 220715B: Global MASTER-Net observations report
  63. GRB 220715B: Prompt enhanced Swift-XRT position
  64. GRB 220715B: Swift detection of a burst
  65. GRB 220715B: Fermi GBM Final Real-time Localization
  66. GRB 220714B: Swift-BAT refined analysis
  67. GRB 220714B: Fermi GBM observation
  68. GRB 220715A: AGILE/MCAL detection
  69. GRB 220714B: LCO Optical Observations
  70. GRB 220715A: Fermi GBM Final Real-time Localization
  71. GRB 220714B: Swift-XRT refined Analysis
  72. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  73. GRB 220714B: UVOT afterglow discovery
  74. GRB 220714B: Enhanced Swift-XRT position
  75. GRB 220713A: Fermi GBM Final Localization
  76. GRB 220714B: Swift detection of a burst
  77. GRB 220714B: Fermi GBM Final Real-time Localization
  78. GRB 220714A: Possible Swift detection of a burst
  79. GRB 220710A: Swift/UVOT Upper Limits
  80. GRB 220711C: Fermi GBM Observation
  81. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  82. GRB 220711B: 10.4 m GTC(+EMIR) observations
  83. GRB 220711B: 10.4 m GTC(+EMIR) observations
  84. GRB 220710A: Swift-XRT afterglow detection
  85. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  86. GRB 220711B, GROND observations
  87. Konus-Wind detection of GRB 220711C
  88. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  89. GRB 220711B: GIT optical upper limits
  90. Fermi GRB 220711B: Global MASTER-Net observations report
  91. GRB 220712B: NOT optical afterglow confirmation
  92. GRB 220710A: Swift ToO observations
  93. GRB 220710A: Swift/BAT-GUANO arcminute localization
  94. GRB 220711B: Swift-BAT refined analysis
  95. IPN triangulation of GRB 220711C (short)
  96. GRB 220711B: Swift-XRT refined Analysis
  97. GRB 220711B: Swift/UVOT Upper Limits
  98. GRB 220711B: Enhanced Swift-XRT position
  99. GRB 220711B: Fermi GBM Detection
  100. GRB 220711B: NOT optical observations

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