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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27394 results found.

  1. GRB 221006A: Swift-XRT observations
  2. GRB 221006A: MAXI/GSC detection
  3. GRB 220930A: MITSuME Akeno optical upper limits
  4. GRB 220912A: Detection by VZLUSAT-2
  5. Fermi trigger No 686588176: Global MASTER-Net observations report
  6. Fermi GBM trigger 686350260/221001869 is not a GRB
  7. GRB 220930A: AbAO Optical Upper Limit
  8. GRB 220930A: Swift-BAT refined analysis
  9. GRB 220930A: Swift-XRT refined Analysis
  10. GRB 220930A: LCOGT Optical Upper Limits
  11. GRB 220930A: Swift/UVOT Upper Limits
  12. GRB 220930A: Enhanced Swift-XRT position
  13. GRB 220930A: COATLI Upper Limits
  14. GRB 220930A: Swift detection of a burst
  15. Fermi-LAT gamma-ray observations of IceCube-220928A
  16. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  17. IPN triangulation of GRB 220927A (long)
  18. GRB 220921A: LCOGT Optical Observations
  19. GRB 220927A: Fermi GBM Final Localization
  20. GRB 220924A: Fermi GBM detection
  21. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  22. Swift Trigger 1125354 (GRB 220926A) is not a GRB
  23. Analysis of long GRB 220926B detected by INTEGRAL
  24. GRB 220926A: Swift detection of a burst
  25. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 220921A: further MeerLICHT observations
  27. GRB 220921A: DDOTI Detection of the Afterglow
  28. GRB 220921A: Fermi GBM detection
  29. GRB 220921A: MeerLICHT afterglow observations
  30. GRB 220921A: Swift-XRT Observations
  31. GRB 220921A: Fermi-LAT detection
  32. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  33. IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
  34. Fermi trigger No 684894705: Global MASTER-Net observations report
  35. IceCube-220907A: No significant detection in HAWC
  36. GRB 220909A: Fermi GBM observation
  37. GRB 220910A: Fermi GBM observation
  38. GRB 220909A: Swift-XRT observations
  39. IPN triangulation of GRB 220905A
  40. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  41. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
  42. GRB 220907A: Swift-BAT refined analysis
  43. IPN triangulation of GRB 220903A (long)
  44. GRB 220907A: Fermi GBM observation
  45. GRB 220907A: Nanshan/NEXT optical upper limits
  46. GRB 220907A: Swift/UVOT Upper Limits
  47. GRB 220907A: Swift-XRT refined Analysis
  48. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  49. GRB 220907A: Swift detection of a burst
  50. Swift GRB220907.59: Global MASTER-Net observations report
  51. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  52. GRB 220831A: DECam detection of a possible optical counterpart
  53. GRB 220831A: Fermi GBM observation
  54. GRB 220831A: Swift-XRT observations
  55. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  56. IceCube-220822A: No significant detection in HAWC
  57. Fermi trigger No 683476673: Global MASTER-Net observations report
  58. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  59. GRB 220826A: Swift-BAT refined analysis
  60. GRB 220826A: Fermi GBM observation
  61. GRB 220826A: Swift-XRT refined Analysis
  62. GRB 220825A: Fermi GBM observation
  63. GRB 220826A: Lesedi optical afterglow detection
  64. GRB 220826A: Swift/UVOT Detection
  65. GRB 220826A: iTelescope optical afterglow observations
  66. GRB 220826A: Enhanced Swift-XRT position
  67. GRB 220826A: Swift detection of a burst with an optical counterpart
  68. GRB 220825A: Swift/BAT-GUANO detection
  69. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  70. GRB 220823A: Fermi GBM detection
  71. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  72. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  73. GRB 220813A: VLT optical observations and possible host galaxy
  74. GRB 220813A: Swift/UVOT Detection
  75. GRB 220810A: Further Swift-XRT observations
  76. GRB 220813A: Swift-XRT refined Analysis
  77. GRB 220813A: Enhanced Swift-XRT position
  78. GRB 220813A: Swift detection of a burst with an optical counterpart
  79. GRB 220810A: Swift-XRT observations
  80. GRB 220719A: Detection by VZLUSAT-2
  81. GRB 220810A: MeerLICHT detection of two afterglow candidates
  82. GRB 220806A: Swift-BAT refined analysis
  83. IceCube Alert 220808.33: Global MASTER-Net observations report
  84. GRB 220730A: Swift-BAT refined analysis
  85. GRB 220730A: Swift-XRT afterglow detection
  86. GRB 220730A: Swift/UVOT Upper Limits
  87. GRB 220730A: Swift-XRT observations
  88. GRB 220730A: Swift detection of a short hard burst
  89. Fermi trigger No 680421061: Global MASTER-Net observations report
  90. GRB 220715B: VIRT Optical Upper Limit
  91. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  92. GRB 220715B: Swift-BAT refined analysis
  93. GRB220714B: UVOT detections
  94. GRB 220715B: Fermi GBM detection
  95. GRB 220715B: Swift-XRT refined Analysis
  96. GRB 220715B: Swift/UVOT Upper Limits
  97. GRB 220715B: Enhanced Swift-XRT position
  98. GRB 220715B: Swift detection of a burst
  99. GRB 220714B: Swift-BAT refined analysis
  100. GRB 220714B: Fermi GBM observation

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