Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11504 results found.

  1. GRB060213: MASTER final result
  2. GRB060213:_MASTER_optical_observation
  3. Konus-Wind observation of bright hard GRB 060213
  4. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  5. GRB 060210: Further refined analysis of the Swift-BAT burst
  6. GRB 060211B: Swift/BAT refined analysis
  7. GRB 060211: ROTSE-III Optical Limits
  8. GRB060206, optical observations
  9. GRB060210: Optical Observations
  10. GRB 060209(?): Swift-BAT detection of a possible burst
  11. GRB 060206: TTT Observations
  12. GRB 060206: optical observations at Asiago
  13. GRB 060206: Super-LOTIS observations
  14. GRB060204C: optical observation
  15. Swift XRT Observation of GRB 060204C
  16. GRB 060204B: Swift-BAT refined analysis
  17. GRB 060204C: ROTSE-III Optical Limits
  18. GRB 060204C: Swift-BAT detection of a burst
  19. GRB 060204B: ART optical limit
  20. GRB 060204A: further INTEGRAL results
  21. GRB 060203: Swift-BAT refined analysis
  22. GRB 060203: RTT150 optical observations
  23. Swift-BAT trigger is GRB 060203
  24. GRB 060203: IR Counterpart
  25. GRB 060202: PROMPT Observations
  26. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  27. GRB 060202: Refined analysis of the Swift-BAT burst
  28. GRB 060202: Swift detection of a burst
  29. GRB 060130: PROMPT Observations
  30. GRB 060130: further INTEGRAL IBIS results
  31. GRB 060121: Confirmation of NIR Afterglow
  32. GRB 060123: Swift refined analysis of an unusual GRB
  33. GRB060105: refined analysis of the Suzaku observation
  34. GRB060124 optical observations
  35. GRB 060121: Probable Detection of NIR Afterglow
  36. Konus-Wind observation of GRB 060124
  37. GRB060124: detailed XRT analysis
  38. GRB 060124: Confirmation of the Afterglow
  39. GRB 060124: Optical Observations at Tautenburg
  40. GRB 060117: Suzaku WAM observation of the prompt emission
  41. GRB 060111B: Suzaku WAM observation of the prompt emission
  42. Konus-Wind observation of GRB 060121
  43. GRB060117 - ATCA 3/6cm radio limits - correction
  44. GRB060117 - ATCA 3/6cm radio limits
  45. Konus-Wind observation of GRB 060117
  46. GRB 060116: PROMPT Observations
  47. GRB 060117: FRAM refined analysis
  48. GRB 060116: Refined analysis of the Swift-BAT burst
  49. GRB 060116: ROTSE-III Optical Limits
  50. GRB 060115: Refined analysis of the Swift-BAT burst
  51. GRB 060115: MITSuME optical afterglow candidate
  52. GRB 060115: Swift detection of a burst
  53. GRB 060114: A long GRB detected by INTEGRAL
  54. GRB 060111B: MITSuME detection of optical afterglow
  55. GRB 060110: MARGE observations
  56. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  57. GRB 060111B: Swift detection of a burst
  58. GRB 060111: TAROT optical observation
  59. GRB 060111: Swift detection of a burst
  60. GRB 060109: Swift-BAT refined analysis
  61. GRB060109, optical observation
  62. GRB060108: Swift detection of its 100th GRB
  63. Konus-Wind observation of GRB 060105
  64. GRB 060105: Mitsume optical observations
  65. GRB 060105: XRT refined analysis
  66. GRB 060102: Swift-BAT detection of a burst
  67. GRB051227: SARA Observations
  68. GRB 051227: Gemini observations
  69. GRB 051227: Magellan r'-band Imaging/Astrometry
  70. GRB 051227: refined analysis of VLT images
  71. GRB 051227: R-band object in the XRT error circle
  72. Konus-Wind observation of GRB 051221A
  73. GRB051221A: Suzaku WAM observation of the prompt emission
  74. GRB 051221A: Chandra Afterglow Position
  75. GRB 051221B: ROTSE-III Optical Limits
  76. GRB 051221A: RAPTOR Fading Counterpart Constraint
  77. GRB 051221B: BOOTES optical observations.
  78. Swift-BAT detection of a possible burst
  79. GRB 051211B: Swift XRT confirmation of the afterglow
  80. GRB 051211b: RTT150 optical observations
  81. GRB051211b: P60 Observations
  82. GRB 051211B: a long GRB detected by INTEGRAL
  83. IPN observations of SGR1806-20
  84. An extraordinary long burst on December 3 from SGR1806-20
  85. Possible resuming of the SGR 1806-20 activity
  86. GRB 051127: Swift-BAT detection of a possible burst
  87. GRB051117B: Swift XRT refined analysis
  88. GRB051111: Suzaku WAM observation of the prompt emission
  89. GRB051111: Rc optical observations
  90. GRB051008: Suzaku WAM observation of the prompt emission
  91. GRB 051021 Optical Observations
  92. GRB 051117B: ROTSE-III Optical Limits
  93. GRB 051117: Swift detection of a bright burst
  94. GRB050925: analysis of the XMM-Newton observation
  95. GRB 051111: Further spectroscopic analysis
  96. GRB/SGR 050925: XMM-Newton ToO observation
  97. GRB051111: Swift/UVOT Observations
  98. GRB 051111A: KAIT optical observations
  99. GRB051111: Swift-BAT detection of a bright burst
  100. GRB 051109b: GETS observation

Advanced

Download all Circulars as a .tar.gz archive:
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