Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

11790 results found.

  1. IceCube-220907A: No significant detection in HAWC
  2. Konus-Wind detection of GRB 220910A
  3. Fermi GRB 220912A: Global MASTER-Net observations report
  4. GRB 220912A: AstroSat CZTI detection
  5. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  6. GRB 220910A: AstroSat CZTI detection
  7. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  8. GRB 220907A: Swift-XRT position
  9. GRB 220907A: Swift detection of a burst
  10. Fermi GRB 220905A: Global MASTER-Net observations report
  11. Fermi GRB 220902A: Global MASTER-Net observations report
  12. GRB 220831A, VLT/HAWK-I near-infrared observations
  13. Fermi trigger No 683654200: Global MASTER-Net observations report
  14. IceCube-220822A: No significant detection in HAWC
  15. Fermi trigger No 683537972: Global MASTER-Net observations report
  16. Fermi trigger No 683476673: Global MASTER-Net observations report
  17. Konus-Wind detection of GRB 220826A
  18. Fermi trigger No 683202084: Global MASTER-Net observations report
  19. Fermi trigger No 683183601: Global MASTER-Net observations report
  20. GRB 220826A: Swift-XRT refined Analysis
  21. GRB 220826A: Swift detection of a burst with an optical counterpart
  22. GRB 220825A: Swift/BAT-GUANO detection
  23. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  24. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  25. Fermi trigger No 682918137: Global MASTER-Net observations report
  26. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  27. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  28. IceCube Alert 220822.85: Global MASTER-Net observations report
  29. Konus-Wind detection of GRB 220813A
  30. GRB 220813A: Swift-XRT refined Analysis
  31. GRB 220813A: Swift detection of a burst with an optical counterpart
  32. Fermi trigger No 681998863: Global MASTER-Net observations report
  33. GRB 220810A: MeerLICHT detection of two afterglow candidates
  34. Fermi trigger No 681890304: Global MASTER-Net observations report
  35. Swift GRB220806.76: Global MASTER-Net observations report
  36. GRB 220803A: AstroSat CZTI detection
  37. Konus-Wind detection of GRB 220730A (short)
  38. GRB 220729A: AstroSat CZTI detection
  39. Fermi trigger No 680782656: Global MASTER-Net observations report
  40. Fermi GRB 220728A: Global MASTER-Net observations report
  41. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  42. GRB 220728A: Fermi GBM Final Real-time Localization
  43. Fermi GRB 220724A: Global MASTER-Net observations report
  44. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  45. GRB 220715B: Swift-BAT refined analysis
  46. GRB 220714B: Swift-XRT refined Analysis
  47. GRB 220714B: Swift detection of a burst
  48. GRB 220714A: Possible Swift detection of a burst
  49. GRB 220710A: Swift-XRT afterglow detection
  50. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  51. GRB 220711B, GROND observations
  52. Konus-Wind detection of GRB 220711C
  53. Fermi trigger No 679248723: Global MASTER-Net observations report
  54. Fermi GRB 220711B: Global MASTER-Net observations report
  55. GRB 220710A: Swift/BAT-GUANO arcminute localization
  56. GRB 220711B: Swift-XRT refined Analysis
  57. GRB 220711B: Swift detection of a burst
  58. GRB 220707A: AstroSat CZTI detection
  59. GRB 220708B: GIT optical upper limits
  60. GRB 220708B: T193-OHP optical upper limit
  61. Konus-Wind detection of GRB 220708B
  62. GRB 220708B: Swift-XRT afterglow detection
  63. GRB 220708B: Swift/BAT-GUANO arcminute localization
  64. GRB 220708A: Swift-XRT observations
  65. GRB 220706A: Swift-XRT refined Analysis
  66. GRB 220706A, GROND observations
  67. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  68. GRB 220702B: AstroSat CZTI detection
  69. GRB 220706A: Nanshan/NEXT optical upper limits
  70. GRB 220706A: Swift detection of a burst
  71. GRB 220702B: Fermi GBM Final Localization
  72. Alert from the HAWC Burst Monitor HAWC-220702A
  73. GRB 220627A: AstroSat CZTI detection
  74. GRB 220701A: Swift-XRT refined Analysis
  75. GRB 220701A: BOOTES-5/JGT early optical upper limit
  76. GRB 200701A: KAIT Optical Upper Limit
  77. GRB 220701A: Swift detection of a burst
  78. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  79. GRB 220627A, GROND observations
  80. GRB 220624A: AGILE/GRID refined analysis
  81. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  82. Konus-Wind detection of GRB 220627A
  83. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  84. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  85. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  86. Konus-Wind detection of GRB 220624A
  87. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  88. GRB 220627A: Fermi-LAT detection
  89. IceCube Alert 220627.74: Global MASTER-Net observations report
  90. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  91. IPN triangulation of GRB 220624A
  92. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220624A: AGILE/GRID analysis
  94. GRB 220624A: AGILE detection
  95. Konus-Wind detection of GRB 220623A
  96. GRB 220624B: Fermi GBM Final Real-time Localization
  97. GRB 220623A: Swift-XRT refined Analysis
  98. Konus-Wind detection of GRB 220609B
  99. GRB 220623A: AGILE detection
  100. GRB 220623A: AstroSat CZTI detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov