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"

28235 results found.

  1. GRB 220521A: MITSuME Akeno optical upper limits
  2. GRB 220521A: REM optical/NIR upper limits
  3. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 220521A: LCO Optical Detection
  5. GRB 220521A: Swift-BAT refined analysis
  6. GRB 220521A: Fermi GBM detection
  7. GRB 220521A: RATIR Optical and NIR Observations
  8. GRB 220521A: Swift-XRT refined Analysis
  9. GRB 220521A: Swift/UVOT Upper Limits
  10. GRB 220521A: SAO RAS optical observations
  11. GRB 220521A: Enhanced Swift-XRT position
  12. GRB 220521A: NOT optical afterglow detection
  13. GRB 220521A: Swift detection of a burst
  14. Swift BAT Trigger 1107209 is not an astrophysical event
  15. GRB 220518A: Swift-BAT refined analysis
  16. GRB 220518A: Swift-XRT refined Analysis
  17. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  18. GRB 220518A: Swift/UVOT Detection
  19. GRB 220518A: Enhanced Swift-XRT position
  20. GRB 220518A: Swift detection of a burst
  21. GRB 220514A: MITSuME Akeno optical observation
  22. GRB 220514A: GRANDMA Optical Afterglow Observations
  23. Konus-Wind detection of GRB 220506A
  24. Konus-Wind detection of GRB 220514B
  25. GRB 220514A: Fermi GBM observation
  26. GRB 220514B: Swift-XRT observations
  27. GRB 220511A: Swift-XRT afterglow detection
  28. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  29. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  30. IceCube-220513A: No significant detection in HAWC
  31. GRB 220514B: MAXI/GSC detection
  32. MAXI GRB220514.98: Global MASTER-Net observations report
  33. GRB 220514A: MeerLICHT optical afterglow candidate
  34. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  35. Konus-Wind detection of GRB 220511A
  36. IceCube-220509A: No significant detection in HAWC
  37. GRB 220511A: Fermi GBM observation
  38. GRB 220511A: Swift-XRT observations
  39. GRB 220511A: Swift/BAT-GUANO arcminute localization
  40. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  41. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  42. GRB 220507A: AstroSat CZTI detection
  43. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  44. Fermi trigger No 673846271: Global MASTER-Net observations report
  45. GRB 220506A: MITSuME Akeno optical upper limits
  46. GRB 220506A: GIT optical upper limit.
  47. Swift-BAT triggers 1105560-1 are not GRBs
  48. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  49. MAXI GRB220506.27: Global MASTER-Net observations report
  50. GRB 220430A: Nanshan/NEXT optical upper limit
  51. GRB 220430A: Nanshan/HMT optical upper limit
  52. GRB 220430A: GIT optical upper limits
  53. IPN triangulation of GRB 220423A
  54. GRB 220427A: LCO Optical Observations
  55. IceCube-220501A: Upper limits from a search for additional neutrino events in IceCube
  56. GRB 220501A: Swift-BAT refined analysis
  57. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  58. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  59. GRB 220501A: BOOTES-1 optical upper limit
  60. GRB 220501A: Fermi GBM observation
  61. GRB 220430A: AstroSat CZTI detection
  62. GRB 220501A: Fermi GBM Final Real-time Localization
  63. GRB 220430A: Swift-BAT refined analysis
  64. GRB 220430A: Swift-XRT refined Analysis
  65. GRB 220430A: Mondy and AbAO optical upper limits
  66. GRB 220430A: MeerLICHT optical upper limits
  67. GRB 220430A: Enhanced Swift-XRT position
  68. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  69. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  70. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  72. GRB 220427A: Swift-BAT refined analysis
  73. GRB 220427A: VLT/X-shooter photometry
  74. GRB 220426A: Swift-XRT and UVOT observations
  75. GRB 220423A: Detection by VZLUSAT-2
  76. GRB 220427A: Swift-XRT refined Analysis
  77. GRB 220427A: Enhanced Swift-XRT position
  78. GRB 220427A: Swift detection of a burst with an optical counterpart
  79. IPN triangulation of GRB 220426A
  80. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  81. GRB 220426A: Fermi GBM detection
  82. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  83. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  84. GRB 220426A: BALROG localization (Fermi Trigger 672648596/ GRB 220426285)
  85. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  86. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  87. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 220421B: Detection by VZLUSAT-2
  89. GRB 220421A: Fermi GBM observation
  90. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  91. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  92. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220403C: Further Swift-XRT observations
  94. GRB 220417A: Fermi GBM detection
  95. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  96. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  97. GRB 220412B: Swift/UVOT Upper Limits
  98. Fermi trigger No 671729344: Global MASTER-Net observations report
  99. GRB 220412B: Swift-BAT refined analysis
  100. GRB 220408B: Fermi GBM observation

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