Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

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"

38284 results found.

  1. EP240618a: TRT optical upper limit
  2. Fermi trigger No 740474239: Global MASTER-Net observations report
  3. Fermi GRB 240619A: Global MASTER-Net observations report
  4. GRB 240615A: possible transient detection from Wendelstein observations
  5. LIGO/Virgo S240615dg: GRANDMA/FRAM-CTA-N Observations
  6. EP240618a: OHP/T193 MISTRAL i' and Y band upper limits
  7. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  8. GRB 240619B: Fermi GBM Final Real-time Localization
  9. Fermi trigger No 740430582: Global MASTER-Net observations report
  10. GRB240615A: 1.3m DFOT optical upper limit
  11. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  12. GRB 240619A: Fermi GBM Final Real-time Localization
  13. EP240617a: BOOTES-6/DPRT optical upper limit
  14. EP240617a is likely a GRB event
  15. LIGO/Virgo/KAGRA S240615ea: Upper limits from Swift/BAT-GUANO
  16. LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
  17. GRB 240615A: J-band upper limits from WINTER
  18. GRB 240615A: Fermi GBM Observation
  19. GRB 240615A: Swift-XRT observations
  20. GRB 240615A: GECAM detection
  21. GRB 240615A: FLWO-1.2m optical upper limits
  22. Fermi trigger No 740221779: Global MASTER-Net observations report
  23. Fermi GRB 240616A: Global MASTER-Net observations report
  24. Konus-Wind detection of GRB 240615A (short/hard)
  25. GRB 240615A: GOTO optical upper limits
  26. Fermi trigger No 740166710: Global MASTER-Net observations report
  27. GRB 240616A: Fermi GBM Final Real-time Localization
  28. GRB 240615A: Swift ToO observations
  29. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  30. GRB 240615A: Fermi GBM Final Real-time Localization
  31. GRB 240603A: VZLUSAT-2 detection
  32. GRB 240612A: GRBAlpha detection
  33. GRB 240613A: Fermi GBM Final Real-time Localization
  34. Fermi GRB 240612B: Global MASTER-Net observations report
  35. Fermi GRB 240612A: Global MASTER-Net observations report
  36. GRB 240612B: Fermi GBM Final Real-time Localization
  37. GRB 240612A: Fermi GBM Final Real-time Localization
  38. GRB 240607A: GECAM detection of a bright long burst
  39. Fermi GRB 240611A: Global MASTER-Net observations report
  40. Konus-Wind detection of GRB 240607A
  41. GRB 240611A: Fermi GBM Final Real-time Localization
  42. GRB 240529A: LBT optical detection and late temporal decay
  43. GRB 240529A : MITSuME Akeno optical afterglow detection
  44. Trigger 1236151: Swift detection of EXO 0748-676
  45. Fermi GRB 240610A: Global MASTER-Net observations report
  46. GRB 240610A: Fermi GBM Final Real-time Localization
  47. IPN triangulation of GRB 240607A
  48. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  49. Fermi trigger No 739632045: Global MASTER-Net observations report
  50. Fermi GRB 240608A: Global MASTER-Net observations report
  51. Konus-Wind detection of GRB 240606B
  52. Fermi trigger No 739506569: Global MASTER-Net observations report
  53. GRB 240608A: Fermi GBM Final Real-time Localization
  54. Fermi GRB 240607A: Global MASTER-Net observations report
  55. GRB 240529A: NOEMA detection
  56. GRB 240607A: Fermi GBM Observation
  57. GRB 240606B: Fermi GBM Observation
  58. Swift Trigger 1235109: consistent with noise and not astrophysical
  59. GRB 240607A: AstroSat CZTI detection of bright long burst
  60. GRB 240607A: Fermi GBM detection of a very bright burst
  61. GRB 240529A: radio detection with AMI-LA
  62. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  63. GRB 240607A: Fermi GBM Final Real-time Localization
  64. GRB 240606B: GECAM-B detection a long burst
  65. Fermi trigger No 739373591: Global MASTER-Net observations report
  66. GRB 240606B: Swift-XRT afterglow detection
  67. Swift GRB240606.15: Global MASTER-Net observations report
  68. GRB 240606B: Swift ToO observations
  69. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  70. Konus-Wind detection of GRB 240603A
  71. Swift Trigger 1235109: a possible GRB 240606A
  72. Fermi GRB 240604A: Global MASTER-Net observations report
  73. IPN triangulation of GRB 240531A (short)
  74. Fermi GRB 240605A: Global MASTER-Net observations report
  75. Fermi GRB 240605C: Global MASTER-Net observations report
  76. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  77. GRB 240605C: Fermi GBM Final Real-time Localization
  78. IPN triangulation of GRB 240603A
  79. GRB 240605B: Fermi GBM Final Real-time Localization
  80. GRB 240604A: Fermi GBM Final Localization
  81. GRB 240605A: Fermi GBM Final Real-time Localization
  82. GRB 240604A: GECAM detection of a long burst
  83. GRB 240529A: SAO RAS optical observations
  84. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  85. Fermi GRB 240603C: Global MASTER-Net observations report
  86. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  87. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  88. GRB 240603A: Fermi GBM Final Localization
  89. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  90. GRB 240603C: Fermi GBM Final Real-time Localization
  91. GRB 240603B: Swift detection of a possible burst
  92. GRB 240529A: MASTER prompt OT detection
  93. GRB 240603A: GECAM detection of a short burst
  94. GRB 240529A: continued SAO RAS optical observations
  95. Fermi GRB 240602A: Global MASTER-Net observations report
  96. GRB 240529A: OSN optical detection
  97. GRB 240529A: further SAO RAS optical observations
  98. GRB 240602A: Fermi GBM Final Real-time Localization
  99. Swift Trigger 1232465 is not a GRB
  100. GRB 240529A: AKO Optical Afterglow Follow-Up Observations

Advanced

Download all Circulars as a .tar.gz archive:
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