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"

26350 results found.

  1. GRB 111109A: Swift detection of a burst
  2. GRB 111107A: Fermi GBM observation
  3. GRB 111107A: Swift-XRT refined Analysis
  4. GRB 111107A: VLT/X-shooter spectroscopy
  5. GRB 111107A: Swift-BAT refined analysis
  6. GRB 111107A: Enhanced Swift-XRT position
  7. GRB 111107A: GROND observations
  8. GRB 111107A: Swift detection of a burst with an optical counterpart
  9. Konus-Wind observation of GRB 111103B
  10. GRB 111103B: Swift-XRT refined Analysis
  11. GRB 111103A: Fermi GBM observation
  12. GRB 111103B: optical observations from TAU, Ka-Dar
  13. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  14. GRB 111103B: Enhanced Swift-XRT position
  15. GRB 111103B: Swift-BAT refined analysis
  16. GRB 111103A: Swift-BAT refined analysis
  17. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  18. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  19. GRB 111103A: Swift detection of a burst
  20. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  21. GRB 111029A: Swift-XRT refined Analysis
  22. GRB 111026A: Swift-BAT refined analysis
  23. GRB 111029A: Swift-BAT refined analysis
  24. GRB 111029A: Enhanced Swift-XRT position
  25. GRB 111029A: Swift detection of a burst
  26. GRB 111026A: Swift detection of a burst
  27. GRB111022B: D50 optical limit
  28. GRB 111020A: Chandra Observation
  29. GRB 111022A: Swift/UVOT Upper Limits
  30. GRB 111022B, Swift-BAT refined analysis
  31. GRB 111022B: Swift-XRT refined Analysis
  32. GRB 111022B: Enhanced Swift-XRT position
  33. GRB 111020A Spectral lag analysis
  34. GRB 111022A: Swift-BAT refined analysis
  35. GRB 111022B: MASTER-Net early limit
  36. GRB 111022B: Swift detection of a burst
  37. GRB 111022A: Swift detection of a burst
  38. GRB 111020A: Swift-XRT refined Analysis
  39. GRB 111020A: Swift/UVOT Upper Limits
  40. GRB 111020A: Swift-BAT refined analysis
  41. GRB 111020A: Enhanced Swift-XRT position
  42. GRB 111020A: BOOTES-3 Optical Upper Limit.
  43. GRB 111020A: Planned XMM-Newton observation
  44. GRB 111020A: Swift detection of a short burst
  45. GRB 110918A: Optical light curve for days 1.4 to 16.3
  46. GRB 111018A: Swift-BAT refined analysis
  47. Konus-Wind observation of GRB 111016B
  48. GRB 111018A: Swift-XRT refined Analysis
  49. GRB 111018A: GROND Upper Limits
  50. GRB 111018A: Enhanced Swift-XRT position
  51. IPN Triangulation of GRB 111016B (long duration, intense)
  52. GRB 111018A: Swift detection of a burst
  53. GRB 111017A: Fermi GBM Detection
  54. GRB111016A: D50 optical limit
  55. GRB 111016A: Swift/UVOT Detection of a Source
  56. GRB 111016A: Swift-BAT refined analysis
  57. GRB 111016A: Swift-XRT refined Analysis
  58. GRB 111016A: Enhanced Swift-XRT position
  59. GRB 111016A: Swift detection of a burst
  60. GRB 110921A: optical observations
  61. GRB 111008A : miniTAO/ANIR NIR observations
  62. GRB 111005A: ATCA 18 GHz decay
  63. GRB 111008A: Swift/UVOT Upper Limits
  64. Konus-Wind observation of GRB 111008A
  65. GRB 111008A: IAC80 I-band observations
  66. GRB 111008A: VLT/X-shooter spectroscopy
  67. GRB 111008A: Swift-XRT refined Analysis
  68. GRB 111008A: Enhanced Swift-XRT position
  69. GRB 111008A, Swift-BAT refined analysis,
  70. GRB 111008A: Swift detection of a burst
  71. GRB 111005A: ATCA 18 GHz detection
  72. GRB 111005A: ATCA radio upper limit
  73. GRB 111005A : miniTAO/ANIR NIR observations
  74. GRB 111005A: GROND NIR observations
  75. GRB 111005A: Swift-BAT refined analysis
  76. GRB 111005A: Swift detection of a burst
  77. GRB 111003A: Fermi GBM detection
  78. GRB 110928A: Swift-XRT refined Analysis
  79. GRB 110825A: GROND Observations
  80. GRB 110928A: Enhanced Swift-XRT position
  81. GRB 110928A: Swift-BAT refined analysis
  82. GRB 110928A: Swift detection of a burst
  83. GRB 110924A: Swift detection of a possible burst
  84. GCN for GRB 110921B
  85. GRB 110921A: NOT observations
  86. GRB 110921A: Fermi GBM observation
  87. GRB 110921A: Swift-XRT refined Analysis
  88. GRB 110921A, Swift-BAT refined analysis
  89. GRB 110921A: Enhanced Swift-XRT position
  90. GRB 110918A: Swift-XRT refined Analysis
  91. GRB 110918A: Spectroscopy from GTC
  92. GRB 110921A: Swift detection of a burst
  93. GRB 110918A: rest-frame energetics in gamma-gays
  94. GRB 110918A optical observation
  95. GRB 110918A: Gemini-N redshift
  96. GRB 110918A: Afterglow Confirmation from PTF
  97. GRB 110918A: GROND detection of the afterglow candidate
  98. GRB 110918A: INT optical detection of Swift candidate afterglow
  99. GRB 110918A: pseudo-z= from prompt emission spectrum
  100. Konus-Wind observation of GRB 110918A

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