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"

11848 results found.

  1. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  2. GRB 220117A: Terskol and AbAO optical upper limits
  3. GRB 220118A: TARGET optical upper limit
  4. GRB 220117B: TARGET optical upper limit
  5. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  6. AGILE observations of a bright burst from SGR 1935+2154
  7. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  8. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  9. IPN triangulation of GRB 211226A
  10. GRB 220120A: Fermi GBM Final Localization
  11. GRB 220118A: Fermi GBM detection
  12. GRB 220117C: Swift/BAT-GUANO arcminute localization
  13. Konus-Wind observation of the recent SGR 1935+2154 activity
  14. GRB 220118A: Swift detection of a burst with an optical counterpart
  15. GRB 220118A: Fermi GBM Final Real-time Localization
  16. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  17. GRB 220117B: Swift-XRT refined Analysis
  18. GRB 220117A: Swift-XRT refined Analysis
  19. GRB 220117B: Nanshan/NEXT optical upper limit
  20. GRB 220117B: MITSuME Akeno optical upper limits
  21. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  22. Swift GRB 220117A: Global MASTER-Net observations report
  23. Swift GRB 220117B: Global MASTER-Net observations report
  24. GRB 220117B: Swift detection of a burst
  25. GRB 220117A: Swift detection of a burst
  26. Fermi trigger No 663967527: Global MASTER-Net observations report
  27. Fermi trigger No 663899819: Global MASTER-Net observations report
  28. Fermi trigger No 663966693: Global MASTER-Net observations report
  29. Fermi trigger No 663921434: Global MASTER-Net observations report
  30. Fermi trigger No 663710289: Global MASTER-Net observations report
  31. AGILE observations of a burst from SGR 1935+2154
  32. GRB 220111A: AstroSat CZTI detection
  33. Fermi GRB 220111A: Global MASTER-Net observations report
  34. Konus-Wind detection of GRB 220101A
  35. Konus-Wind detection of GRB 220107B
  36. Konus-Wind detection of GRB 220107A
  37. GRB 220107A: further SAO RAS optical observations
  38. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  39. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  40. GRB 220107A: MITSuME Akeno optical observation
  41. GRB 220107B: AstroSat CZTI detection
  42. GRB 220107A: Swift-XRT afterglow detection
  43. GRB 220107B: Fermi-LAT detection
  44. GRB 220107A: AstroSat CZTI detection
  45. Fermi GRB 220107A: Global MASTER-Net observations report
  46. GRB 220101A: Tautenburg observations
  47. GRB 220101A: further TNG NIR observations
  48. Fermi GRB 220103A: Global MASTER-Net observations report
  49. GRB 211229B: Swift/BAT-GUANO detection outside the coded FOV
  50. GRB 220101A: TNG NIR afterglow detection
  51. GRB 220101A: ALMA detection
  52. GRB 211231A: AstroSat CZTI detection
  53. GRB 220101A: NOT redshift confirmation
  54. GRB 220101A: Liverpool telescope imaging of a high-redshift afterglow
  55. GRB 220101A: Swift-XRT refined Analysis
  56. GRB 220101A: AGILE detection
  57. GRB 220101A: Fermi-LAT detection
  58. GRB 211229B: AGILE detection
  59. GRB 211229A: Swift-XRT and UVOT observations
  60. GRB 211229C: Swift/BAT-GUANO detection likely outside the coded FOV
  61. GRB 211229A: Swift/BAT-GUANO arcminute localization
  62. GRB 211227A: Swift-XRT refined Analysis
  63. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  64. GRB 211227A: BOOTES-2/TELMA optical upper limit
  65. GRB 211227A: Swift detection of a burst
  66. GRB 211226A: Swift/BAT-GUANO detection outside the coded FOV
  67. GRB 211226A: AGILE/MCAL detection of a burst
  68. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  69. Fermi trigger No 662084433: Global MASTER-Net observations report
  70. GRB 211223C: Swift-BAT refined analysis
  71. AGILE observations of a bright burst from SGR 1935+2154
  72. GRB 211223C: BOOTES-4/MET optical upper limit
  73. Fermi GBM Sub-Threshold Detection of GRB 211221A
  74. Fermi GBM Sub-Threshold Detection of GRB 211207A
  75. GRB 211221A: Swift-BAT refined analysis
  76. GRB 211223C: Swift detection of a burst
  77. GRB 211221A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  78. GRB 211219B: AstroSat CZTI detection
  79. GRB 211219A: AstroSat CZTI detection
  80. GRB 211221A: BOOTES-4/MET optical upper limit
  81. GRB 211218A: MITSuME Akeno optical upper limits
  82. Swift GRB 211221A: Global MASTER-Net observations report
  83. GRB 211221A: Swift detection of a burst
  84. GRB 211219A: Swift/BAT-GUANO detection outside the coded FOV
  85. Fermi GRB 211219B: Global MASTER-Net observations report
  86. GRB 211216A: Fermi GBM observation
  87. GRB 211218A, MAXI J0909-041: MAXI/GSC detection
  88. MAXI GRB211218.04: Global MASTER-Net observations report
  89. GRB 211106A: XMM-Newton monitoring campaign detections
  90. Fermi-LAT Gamma-ray Observations of IceCube-211216B
  91. Fermi-LAT Gamma-ray Observations of IceCube-211216A
  92. GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 211216A: GECAM detection
  94. Fermi GRB 211216A: Global MASTER-Net observations report
  95. GRB 211211A - Gemini K-band detection
  96. Chandra observation of GW170817 at ~1575 days since merger (all epochs)
  97. GRB 211211B: GECAM detection
  98. GRB 211211A: MITSuME Akeno optical observation
  99. GRB 211211A: Swift-XRT refined Analysis
  100. Fermi GRB 211211B: Global MASTER-Net observations report

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