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"

19681 results found.

  1. GRB 081210, SMARTS optical/IR observations
  2. GRB 081211: Enhanced Swift-XRT position
  3. GRB 081211: Swift detection of a burst
  4. GRB081203B: optical observations
  5. GRB 081210: Enhanced Swift-XRT position
  6. GRB 081210: Swift-BAT refined analysis
  7. GRB 081210: Swift detection of a burst with optical afterglow
  8. IPN triangulation of short hard GRB 081209
  9. GRB 081203A: optical observations
  10. GRB 081206: Fermi GBM detection
  11. GRB 081128: afterglow observations
  12. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  13. GRB081203A: Optical observations at Ishigaki
  14. GRB 081204: GROND Observations
  15. Radio detection of GRB 081203B with the VLA
  16. GRB081203A: Radio upper limit at 15 GHz
  17. GRB 081204B: Fermi GBM detection
  18. GRB 081204: Swift/UVOT Upper Limits
  19. GRB081203A: MITSuME optical observation
  20. GRB081203A: optical observation
  21. VLA Radio upper limit on GRB 081203A
  22. GRB 081203B: optical observations
  23. Swift/UVOT detection of GRB081203B
  24. GRB 081203B: Swift-XRT candidate afterglow.
  25. GRB 081203A: optical observations
  26. GRB 081203: Enhanced Swift-XRT position
  27. GRB 081130B: MASTER prompt optical observations
  28. GRB081203: optical observation
  29. GRB 081203: Swift detection of a burst with a bright optical counterpart
  30. GRB 081128: optical observation
  31. Swift Trigger 335971: Swift/UVOT Observations
  32. GRB 081126: afterglow photometry
  33. GRB 081126: Fermi GBM detection
  34. VLA Radio upper limit on GRB 081126
  35. GRB 081129: Fermi GBM detection
  36. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  37. GRB 081128A: optical observations
  38. Trigger 335971: Swift possible detection of a burst
  39. GRB081128: Swift/UVOT Upper Limits
  40. GRB 081122B: Fermi GBM Detection
  41. GRB 081128: Liverpool Telescope afterglow confirmation
  42. GRB081128: optical observations
  43. GRB 081128: Enhanced Swift-XRT position
  44. GRB 081128: Optical observation of xinglong TNT
  45. GRB 081128: Swift detection of a burst
  46. GRB 081126: GRT Optical Observation
  47. GRB 081127: Swift/UVOT Upper Limits
  48. GRB 081127: Enhanced Swift-XRT position
  49. GRB 081127: Swift detection of a burst
  50. GRB 081126: Swift/UVOT Observations
  51. GRB 081126: optical observations
  52. GRB 081126: Enhanced Swift-XRT position
  53. GRB 081126: TAROT Calern observatory optical observations
  54. GRB 081126: Swift detection of a burst
  55. GRB 081125: Fermi GBM detection
  56. GRB 081124: Fermi GBM detection
  57. GRB 081120: Fermi GBM detection
  58. GRB 081118: Fermi GBM detection.
  59. GRB 081122: Fermi GBM detection
  60. GRB 081121, SMARTS optical/IR afterglow observations
  61. GRB081121: Refined Swift/UVOT observations
  62. GRB 081121: Swift-XRT refined analysis
  63. GRB 081121: Enhanced Swift-XRT position
  64. GRB 081121: GROND observations
  65. GRB081121: Swift/UVOT observations
  66. GRB081118 : optical upper limit
  67. GRB 081119: Fermi GBM detection
  68. VLA Radio upper limit on GRB 081118
  69. GRB 081118: Swift-XRT refined analysis
  70. GRB 081118: GROND detection of afterglow
  71. GRB 081118: optical afterglow candidate
  72. GRB 081118: Swift UVOT Upper Limits
  73. GRB 081118: Enhanced Swift-XRT position
  74. GRB 081118: Swift detection of a burst
  75. GRB 081109A: confirmation of possible detection host galaxy
  76. Further Swift-XRT observations of the probable GRB 081105.
  77. GRB 081113: Fermi GBM detection
  78. GRB 081102: RTT150 Optical observations
  79. GRB 081110: Fermi GBM detection
  80. GRB 081110: MASTER: first optical observations Fermi GRB
  81. GRB 081109: TAROT La Silla observatory optical observations
  82. GRB 081102: MASTER refind and final results
  83. GRB 081109: GROND redshift limit and host extinction
  84. GRB 081025: Swift-XRT further analysis
  85. GRB 081024B: Swift-XRT late-time observations
  86. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  87. GRB 081109A: Swift-XRT refined analysis
  88. GRB 081109: Fermi GBM detection
  89. Swift-BAT Trigger 334129: possible burst
  90. GRB 081109: REM NIR afterglow detection
  91. GRB 081109: Swift detection of a burst
  92. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  93. SGR 1806-20: Fermi GBM detection
  94. GRB 081102B: Fermi GBM detection
  95. GRB 081105B: Fermi GBM detection
  96. GRB 081107: Fermi GBM detection
  97. GRB 081104: GROND found no Optical/NIR Afterglow
  98. GRB 081105: GROND Upper Limits
  99. Radio observation of GRB 080523 with ATCA
  100. Radio observation of GRB 080520 with ATCA

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