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"

45794 results found.

  1. GRB121209A: RATIR Optical and NIR Upper Limits
  2. GRB 121209A: GROND optical afterglow candidate
  3. GRB 121209A: Gemini-South imaging
  4. GRB 121209A: PAIRITEL NIR Observations
  5. GRB 121209A: UVOT Observation
  6. GRB 121209A: Swift detection of a burst
  7. GRB 121127A: Suzaku WAM observation of the prompt emission
  8. GRB 121128A: Optical Observations
  9. GRB 121122A: Suzaku WAM observation of the prompt emission
  10. GRB 121202A: Swift/UVOT Upper Limits
  11. GRB 121202A: Swift-XRT refined Analysis
  12. GRB 121202A: Fermi GBM observation
  13. GRB 121202A: Enhanced Swift-XRT position
  14. GRB 121202A: Swift-BAT refined analysis
  15. GRB 121202A: Swift-XRT observations
  16. GRB 121201A: X-shooter redshift
  17. GRB121202A: Swift/UVOT Observations
  18. GRB 121202A: TAROT Calern observatory optical observations
  19. GRB 121202A: Swift detection of a burst
  20. GRB 121201A: GROND afterglow observations and photometric redshift
  21. GRB 121201A: Swift/UVOT Detection
  22. GRB 121201A: Swift-XRT refined Analysis
  23. GRB 121201A: Swift-BAT refined analysis
  24. GRB 121201A: Enhanced Swift-XRT position
  25. GRB 121201A: BOOTES-4 optical observations
  26. GRB 121201A: a GRB with an optical counterpart
  27. GRB 121128A: optical observation in Mondy observatory
  28. GRB 121128A: MITSuME Akeno Optical upper limits
  29. Konus-Wind observation of GRB 121127A
  30. IPN Triangulation of GRB 121127A (short/hard)
  31. GRB 121125A: optical upper limit
  32. GRB 121128A: optical observation in Mondy observatory
  33. GRB 121128A: WSRT radio observation
  34. GRB 121128A: Swift/UVOT Detection
  35. GRB 121128A: Swift-XRT refined Analysis
  36. GRB 121128A: Enhanced Swift-XRT position
  37. GRB 121122A: Fermi GBM observation
  38. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  39. GRB 121128A: Fermi GBM observation
  40. GRB 121128A, Swift-BAT refined analysis
  41. Konus-Wind observation of GRB 121128A
  42. GRB 121128A - Gemini North redshift
  43. GRB 121128A: FTN optical afterglow confirmation
  44. GRB 121128A: Swift detection of a burst with an optical counterpart
  45. GRB 121123A: Suzaku WAM observation of the prompt emission
  46. Konus-Wind observation of GRB 121122A
  47. GRB 121117A: Terskol obseravtions
  48. GRB 121123A: Swift/UVOT Observations
  49. GRB 121125A: Swift/UVOT Detection
  50. IPN Triangulation of GRB 121122A (long/intense)
  51. GRB 121118B: Suzaku WAM observation of the prompt emission
  52. GRB 121125A: Swift-XRT refined Analysis
  53. GRB 121125A: Enhanced Swift-XRT position
  54. GRB 121125A: Fermi GBM Observation
  55. GRB 121125A: Swift-BAT refined analysis
  56. GRB 121125A: LOAO Observation
  57. GRB 121125A: MASTER-NET optical observations
  58. GRB 121125A: Swift detection of a burst with optical counterpart
  59. GRB 121123A: GROND observations
  60. GRB 121123A: Enhanced Swift-XRT position
  61. GRB 121123A: Swift-BAT refined analysis
  62. GRB 121123A: Swift-XRT refined Analysis
  63. GRB 121123A: optical observations
  64. GRB 121123A: BOOTES-4 and IAC80 optical observations
  65. GRB 121123A: NOT optical observations
  66. GRB 121123A: Fermi GBM observation
  67. GRB 121123A: MASTER-NET optical limit
  68. GRB 121123A: GMG optical observation
  69. GRB 121123A: Swift detection of a burst with optical counterpart
  70. GRB 121108A: optical upper limit
  71. GRB 121117A: Optical observations
  72. Konus-Wind observation of GRB 121118B
  73. GRB 121117A: optical upper limit
  74. IPN Triangulation of GRB 121118B (long/intense)
  75. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  76. IPN Triangulation of GRB 121118A
  77. Swift-BAT trigger 538575 is not astrophysical
  78. GRB 121117A: Swift/UVOT Observations
  79. GRB 121117A: Swift-XRT refined Analysis
  80. GRB 121117A: MASTER prompt optical limit
  81. GRB 121117A, Swift-BAT refined analysis
  82. GRB 121117A: ROTSE-III Optical Limits
  83. GRB 121117A: BOOTES-3 early optical upper limit
  84. GRB 121117A: Swift detection of a burst
  85. Swift trigger 538575: Magellan Observations
  86. Fermi GBM trigger 121115.186 is not a GRB
  87. Trigger 538084: Swift detection of XTE J1739-302
  88. GRB 121108A: Swift-XRT refined Analysis
  89. GRB 121108A: Swift/UVOT Upper Limits
  90. GRB 121108A, Swift-BAT refined analysis
  91. GRB 121108A: Xinglong TNT upper limit
  92. GRB 121108A: Enhanced Swift-XRT position
  93. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  94. GRB 121108A: Optical observations
  95. GRB 121108A: MITSuME Ishigakijima upper limits
  96. GRB 121108A: Weihai observatory optical observations
  97. GRB 121108A: MASTER early prompt optical limit
  98. GRB 121108A: TAROT Calern observatory optical observations
  99. GRB 121108A: Swift detection of a burst
  100. GRB 121031A: Fermi GBM 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