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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"

32550 results found.

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

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