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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"

32751 results found.

  1. GRB 220831A: Swift-UVOT Upper Limits
  2. Fermi GRB 220905A: Global MASTER-Net observations report
  3. Introducing Self-Service Configuration of GCN Notices over Email for Transient Alerts
  4. GRB 220831A: DECam detection of a possible optical counterpart
  5. Fermi GRB 220902A: Global MASTER-Net observations report
  6. GRB 220831A, VLT/HAWK-I near-infrared observations
  7. GRB 220831A: Fermi GBM observation
  8. GRB 220831A: Swift-XRT observations
  9. GRB 220831A: Swift ToO observations
  10. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  11. IceCube-220822A: No significant detection in HAWC
  12. Konus-Wind detection of GRB 220826A
  13. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  14. GRB 220826A: Swift-BAT refined analysis
  15. GRB 220826A: Fermi GBM observation
  16. GRB 220826A: Swift-XRT refined Analysis
  17. GRB 220825A: Fermi GBM observation
  18. GRB 220826A: Lesedi optical afterglow detection
  19. GRB 220826A: Swift/UVOT Detection
  20. GRB 220826A: iTelescope optical afterglow observations
  21. Swift GRB 220826A: Global MASTER-Net observations report
  22. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  23. GRB 220823A: Fermi GBM detection
  24. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  25. Konus-Wind detection of GRB 220813A
  26. GRB 220813A: VLT optical observations and possible host galaxy
  27. GRB 220813A: Swift/UVOT Detection
  28. GRB 220810A: Further Swift-XRT observations
  29. GRB 220813A: Swift-XRT refined Analysis
  30. Swift GRB 220813A: Global MASTER-Net observations report
  31. GRB 220810A: Swift-XRT observations
  32. GRB 220810A: Swift ToO observations
  33. GRB 220810A: MeerLICHT detection of two afterglow candidates
  34. Fermi GRB 220810A: Global MASTER-Net observations report
  35. GRB 220627A: MeerKAT radio observations
  36. GRB 220806A: Swift-BAT refined analysis
  37. Konus-Wind detection of GRB 220730A (short)
  38. GRB 220730A: Swift-BAT refined analysis
  39. GRB 220730A: Fermi GBM detection
  40. GRB 220730A: Swift-XRT afterglow detection
  41. GRB 220730A: Swift/UVOT Upper Limits
  42. GRB 220730A: Swift-XRT observations
  43. Swift GRB 220730A: Global MASTER-Net observations report
  44. Fermi GRB 220728A: Global MASTER-Net observations report
  45. Fermi GRB 220724A: Global MASTER-Net observations report
  46. GRB 220715B: VIRT Optical Upper Limit
  47. Fermi GRB 220721A: Global MASTER-Net observations report
  48. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  49. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  50. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  51. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  52. GRB 220715B: Swift-BAT refined analysis
  53. GRB220714B: UVOT detections
  54. GRB 220715B: Fermi GBM detection
  55. GRB 220715B: Swift-XRT refined Analysis
  56. GRB 220715B: Swift/UVOT Upper Limits
  57. Swift GRB 220715B: Global MASTER-Net observations report
  58. GRB 220714B: Swift-BAT refined analysis
  59. GRB 220714B: Fermi GBM observation
  60. GRB 220715A: AGILE/MCAL detection
  61. GRB 220714B: LCO Optical Observations
  62. GRB 220714B: Swift-XRT refined Analysis
  63. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  64. GRB 220714B: UVOT afterglow discovery
  65. GRB 220710A: Swift/UVOT Upper Limits
  66. GRB 220711C: Fermi GBM Observation
  67. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  68. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  69. GRB 220711B, GROND observations
  70. Konus-Wind detection of GRB 220711C
  71. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  72. GRB 220711B: GIT optical upper limits
  73. Fermi GRB 220711B: Global MASTER-Net observations report
  74. GRB 220712B: NOT optical afterglow confirmation
  75. GRB 220710A: Swift ToO observations
  76. GRB 220710A: Swift/BAT-GUANO arcminute localization
  77. GRB 220711B: Swift-BAT refined analysis
  78. IPN triangulation of GRB 220711C (short)
  79. GRB 220711B: Swift-XRT refined Analysis
  80. GRB 220711B: Swift/UVOT Upper Limits
  81. GRB 220711B: Fermi GBM Detection
  82. GRB 220711B: NOT optical observations
  83. GRB 220711B: LCO Optical Upper Limits
  84. GRB 220708B: GIT optical upper limits
  85. GRB 220708A: Swift-BAT refined analysis
  86. GRB 220708B: T193-OHP optical upper limit
  87. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  88. Konus-Wind detection of GRB 220708B
  89. IceCube-220624A: Classification of AT2022nit as a type Ia supernova and AT2021bei as an AGN
  90. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  91. GRB 220708B: Nanshan/NEXT optical upper limits
  92. GRB 220708A: Swift/UVOT Upper Limits
  93. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  94. GRB 220708A: Swift-XRT refined Analysis
  95. GRB 220706A: Swift/UVOT Upper Limits
  96. GRB 220706A: Swift-BAT refined analysis
  97. GRB 220708B: Swift ToO observations
  98. GRB 220708B: Swift/BAT-GUANO arcminute localization
  99. GRB 220706A: LCO Optical Upper Limits
  100. GRB 220627A: ATCA detection of radio counterpart

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