Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

37764 results found.

  1. Fermi trigger No 745220784: Global MASTER-Net observations report
  2. Konus-Wind detection of GRB 240811A
  3. Konus-Wind detection of GRB 240810A
  4. Fermi Gamma-ray Burst Monitor trigger 745220784/240813240 is not a GRB
  5. GRB 240809A: Correction to the VLA source position in GCN 37158
  6. GRB 240810A: SVOM/GRM observation
  7. Fermi Gamma-ray Burst Monitor trigger 240812940/745194848 is not a GRB
  8. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  9. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  10. GRB 240809A: ATA radio non-detection
  11. GRB 240812D: Fermi GBM Final Real-time Localization
  12. GRB 240812C: Fermi GBM Final Real-time Localization
  13. GRB 240809A : RAPAS follow-up observations
  14. GRB 240809A: VLA detection
  15. GRB 240809A: ALMA detection
  16. IPN triangulation of GRB 240810A (short)
  17. GRB 240811A: Swift-BAT refined analysis
  18. GRB 240809A: Swift-BAT refined analysis
  19. GRB 240812B: AstroSat CZTI detection of a long burst
  20. GRB 240811A: Bassano Bresciano Observatory upper limit
  21. GRB 240811A: Swift-XRT refined Analysis
  22. Fermi Gamma-ray Burst Monitor trigger 745135620/240812255 is not a GRB
  23. GRB 240811A: Swift/UVOT Upper Limits
  24. EP240801a: Assy-Turgen optical observations
  25. Fermi GRB 240810A: Global MASTER-Net observations report
  26. Fermi Gamma-ray Burst Monitor trigger 240812094/745121685 is not a GRB
  27. GRB 240812A: Fermi GBM Final Real-time Localization
  28. GRB 240811A: LCOGT Optical Upper Limit
  29. GRB 240811A: Enhanced Swift-XRT position
  30. GRB 240811A: Upper limits with Mephisto
  31. Konus-Wind detection of GRB 240809A
  32. Fermi trigger No 745057312: Global MASTER-Net observations report
  33. Swift GRB 240811A: Global MASTER-Net observations report
  34. GRB 240811A: Swift detection of a burst
  35. Fermi Gamma-ray Burst Monitor trigger 745050426/240811269 is not a GRB
  36. GRB 240810A: Fermi GBM Final Real-time Localization
  37. GRB 240809A: REM detection of the optical afterglow
  38. GRB 240809A: Bassano Bresciano Observatory optical observations
  39. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  40. GRB 240809A: Conclusive redshift from VLT
  41. Fermi-LAT gamma-ray observations of IceCube-240808A
  42. GRB 240809A: KAIT optical observations
  43. GRB 240808A: AstroSat CZTI detection
  44. GRB 240809A: GIT afterglow observations
  45. GRB 240809B: MAXI/GSC detection
  46. GRB 240809A: Swift/UVOT Detection
  47. GRB 240809A: Tentative redshift from NOT
  48. GRB 240809A: Swift-XRT refined Analysis
  49. IPN triangulation of GRB 240807A / EP 240807a
  50. Swift GRB 240809A: Global MASTER-Net observations report
  51. GRB 240809A: JinShan optical observations
  52. GRB 240809A: Enhanced Swift-XRT position
  53. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  54. GRB 240809A: SVOM/GRM observation
  55. GRB 240808A: SVOM/GRM observation
  56. GRB 240807A: SVOM/GRM observation
  57. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  58. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  59. EP240807a: STEP/T80S optical limits
  60. GRB 240807B: AstroSat CZTI detection of a short burst
  61. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  62. GRB 240801A: GRBAlpha detection
  63. GRB 240807B: Fermi GBM Final Localization
  64. GRB 240710B: VZLUSAT-2 detection
  65. GRB 240805A: ATCA Radio Upper Limits
  66. Fermi trigger No 744761058: Global MASTER-Net observations report
  67. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  68. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  69. EP240802a/GRB240802A: KAIT optical upper limit
  70. GRB 240720B: VZLUSAT-2 detection
  71. GRB 240710A: VZLUSAT-2 detection
  72. GRB 240807A: Fermi GBM Final Localization
  73. GRB 240805B: GIT optical upper limit
  74. EP240806a: KAIT optical observations
  75. GRB 240805B: Swift-BAT refined analysis
  76. GRB 240805A: Swift-BAT refined analysis
  77. Fermi trigger No 744629911: Global MASTER-Net observations report
  78. EP240804a (GRB 240804B): NOT optical observations
  79. Konus-Wind detection of GRB 240802A (EP240802a)
  80. Improved IPN triangulation of GRB 240802A / EP 240802a
  81. Konus-Wind detection of GRB 240805A
  82. GRB 240805B Bassano Bresciano Observatory upper limit
  83. GRB240805A: Fermi GBM Observation
  84. GRB 240805B: JinShan optical afterglow detection
  85. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  86. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  87. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  88. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  89. GRB 240626B: VZLUSAT-2 detection
  90. GRB 240624B: VZLUSAT-2 detection
  91. GRB 240619C: VZLUSAT-2 detection
  92. EP 240806A: LCO optical observations
  93. GRB 240805B: Optical detection with 1.6m Mephisto
  94. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  95. GRB 240805B: Swift-XRT refined Analysis
  96. Fermi trigger No 744544656: Global MASTER-Net observations report
  97. GRB 240805B: Swift/UVOT Upper Limits
  98. GRB 240805A: Swift/UVOT Upper Limits
  99. GRB 240805B: BTA optical afterglow candidate
  100. GRB 240805A: SVOM/GRM 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