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"

28229 results found.

  1. GRB 111103B: optical upper limit of CrAO
  2. GRB 111103B: optical upper limit of Mt. Terskol observatory
  3. GRB 111107A: Fermi GBM observation
  4. Continued Skynet observations of GRB111107A
  5. GRB 111107A: Swift-XRT refined Analysis
  6. GRB 111107A: APEX submm observation
  7. GRB 111107A: Swift/UVOT Afterglow Analysis
  8. GRB 111107A: Swift-BAT refined analysis
  9. GRB 111107A: Enhanced Swift-XRT position
  10. GRB 111107A: GROND observations
  11. Skynet observations of GRB 111107A
  12. GRB 111107A: Swift detection of a burst with an optical counterpart
  13. GRB 111103B : WIYN 3.5m NIR observations
  14. GRB 111103B: Swift-XRT refined Analysis
  15. GRB 111103A: Fermi GBM observation
  16. GRB111103B Swift/UVOT Upper Limits
  17. GRB 111103B: Enhanced Swift-XRT position
  18. GRB 111103B: Swift-BAT refined analysis
  19. GRB 111103A: Swift-BAT refined analysis
  20. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  21. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  22. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  23. GRB 111029A: SAO RAS optical limits
  24. GRB 111029A: Super-LOTIS early limits
  25. All GCN Circulars available in a tarfile for data mining
  26. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  27. GRB 111029A: Swift-XRT refined Analysis
  28. GRB 111029A: PAIRITEL NIR Upper Limits
  29. GRB 111026A: Swift-BAT refined analysis
  30. GRB 111029A: Swift/UVOT Upper Limits
  31. GRB 111029A: Swift-BAT refined analysis
  32. GRB 111029A: Enhanced Swift-XRT position
  33. GRB 111029A: optical upper limit
  34. GRB 111029A: ROTSE-III Optical Limits
  35. GRB 111029A: Swift detection of a burst
  36. GRB 111026A: Swift detection of a burst
  37. GRB 111022B: 10.4m GTC z'-band observations
  38. GRB111022B: D50 optical limit
  39. GRB 111020A: Chandra Observation
  40. GRB 111022B: BTA Optical Observations
  41. GRB 111022B: Swift/UVOT upper limits
  42. GRB 111022A: Swift/UVOT Upper Limits
  43. GRB 111016A: optical upper limit
  44. GRB 111022B, Swift-BAT refined analysis
  45. GRB 111022B: Swift-XRT refined Analysis
  46. GRB 111022A: Swift-XRT refined Analysis
  47. GRB 111022B: NOT observations
  48. GRB 111022B: Enhanced Swift-XRT position
  49. GRB 111022A: Swift-BAT refined analysis
  50. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  51. GRB 111022B: Swift detection of a burst
  52. GRB 111022A: Swift detection of a burst
  53. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  54. GRB 111020A: EVLA observations
  55. GRB 111020A: Swift-XRT refined Analysis
  56. GRB 111020A: Swift/UVOT Upper Limits
  57. GRB 111020A: Faulkes Telescope South observations
  58. GRB 111020A: Swift-BAT refined analysis
  59. GRB 111020A: Enhanced Swift-XRT position
  60. GRB 111020A: BOOTES-3 Optical Upper Limit.
  61. GRB 111020A: Swift detection of a short burst
  62. GRB 111018A: Swift/UVOT Upper Limits
  63. GRB 111018A: Swift-BAT refined analysis
  64. GRB 111018A: Swift-XRT refined Analysis
  65. GRB 111018A: GROND Upper Limits
  66. GRB 111018A: Enhanced Swift-XRT position
  67. IPN Triangulation of GRB 111016B (long duration, intense)
  68. GRB111016A : WIYN 3.5m NIR observations
  69. GRB 111018A: Swift detection of a burst
  70. GRB 111017A: Fermi GBM Detection
  71. GRB111016A: D50 optical limit
  72. GRB 111016A: Gemini Detection of the NIR Counterpart
  73. GRB 111016A: Swift/UVOT Detection of a Source
  74. GRB 111016A: Swift-BAT refined analysis
  75. GRB 111016A: P60 Afterglow Candidate
  76. GRB 111016A: Swift-XRT refined Analysis
  77. GRB 111016A: Enhanced Swift-XRT position
  78. GRB 111016A: Swift-XRT observations
  79. GRB 111016A: Swift detection of a burst
  80. GRB 110921A: optical observations
  81. GRB 111008A: Swift/UVOT Upper Limits
  82. GRB 111008A: IAC80 I-band observations
  83. GRB 111008A: Swift-XRT refined Analysis
  84. GRB 111008A, GROND observations
  85. GRB 111008A: NOT optical observation
  86. GRB 111008A: Gemini optical counterpart
  87. GRB 111008A: Enhanced Swift-XRT position
  88. GRB 111008A, Swift-BAT refined analysis,
  89. GRB 111008A: Swift detection of a burst
  90. GRB 111005A: ATCA 18 GHz detection
  91. GRB 111005A: ATCA radio upper limit
  92. GRB 111005A : miniTAO/ANIR NIR observations
  93. GRB 111005A: GROND NIR observations
  94. GRB 111005A: VLT IR observations
  95. GRB 111005A: Swift-BAT refined analysis
  96. GRB 111005A: Swift detection of a burst
  97. GRB 111003A: Fermi GBM detection
  98. GRB 110921A: MITSuME-Akeno Optical photometry
  99. Skynet/Dolomiti observations of GRB 110928A
  100. Skynet observations of GRB 110928A

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