Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

20453 results found.

  1. GRB061210: Radio Observations
  2. GRB 061202: Suzaku WAM observation of the prompt emission
  3. GRB 061210, Swift-BAT refined analysis of the SHB
  4. Optical Afterglow observations of GRB 061126
  5. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  6. GRB 061202: TORTOREM optical upper limits
  7. GRB 061201: VLT optical decay
  8. GRB 061201: SOAR Confirmation of Candidate Afterglow
  9. GRB061202: FRAM early follow-up limit
  10. GRB061202 optical limit by "Pi of the Sky"
  11. Konus-Wind observation of GRB 061201
  12. GRB061202: optical/NIR observations with REM
  13. GRB061202: Swift/UVOT Upper Limits
  14. GRB 061202, Swift-BAT refined analysis
  15. GRB 061202: Swift detection of a burst
  16. GRB 061201: VLT optical observations
  17. INT+WFC observations of GRB 061126
  18. GRB 061126: Early Super-LOTIS Observations
  19. RHESSI Spectrum of GRB061126
  20. GRB061126: Optical afterglow observations from MIRO
  21. GRB061126: Optical afterglow observations from MIRO
  22. GRB 061126 : SDSS Pre-Burst Observations
  23. GRB 061126: Swift/UVOT Observations
  24. GRB 061126: Early Detection of the IR Afterglow
  25. GRB 061126: Swift detection of a burst
  26. GRB 061122: Candidate Optical Afterglow
  27. GRB061122: Swift/UVOT Optical Observations
  28. GRB 061121: ART detection in Ic
  29. GRB061121: P60 Observations
  30. Radio detection of GRB 061121
  31. GRB061122: Swift-XRT position
  32. Konus-Wind observation of GRB 061122
  33. RHESSI Spectrum of GRB061121
  34. Konus-Wind and Konus-A observations of GRB 061121
  35. Swift-BAT trigger 239987 is not a GRB
  36. GRB 061121: Swift/UVOT Observations
  37. GRB 061121, Swift-BAT refined analysis
  38. GRB061121, optical observation
  39. GRB 061121: Optical observation at the KANATA 1.5m telescope
  40. GRB 061121: Swift detection of a bright burst with an optical counterpart
  41. GRB 060605: NIR Observations
  42. GRB 050915B: optical afterglow
  43. Swift/UVOT Upper Limits for GRB061110b
  44. Swift/UVOT Upper Limits for GRB061110a
  45. GRB 061110B, Swift-BAT refined analysis
  46. GRB061110B: Optical observations at Crni Vrh
  47. GRB 061110A, Swift-BAT refined analysis
  48. GRB 061110B: TAROT Calern observatory optical observations
  49. GRB 061110B: Swift detection of a burst
  50. GRB 061110: Candidate confirmed
  51. GRB 061110: ROTSE-III Optical Limits
  52. GRB 061110: Swift detection of a burst
  53. GRB061110A - Optical Non-detection
  54. GRB 061109: TAROT Calern observatory optical observations
  55. GRB 061027: TAROT La Silla observatory optical observations
  56. GRB 061028: Swift/XRT Astrometry Correction
  57. GRB 061102: Swift/UVOT Magnitude Upper Limits
  58. GRB061102B: Super-LOTIS observations
  59. GRB 061028: Optical R passband observations
  60. GRB 061102B: Swift detection of a possible burst
  61. GRB 061102: Swift detection of a burst
  62. GRB 061028: VLA Observation
  63. GRB 061004: Swift/XRT Astrometry Correction
  64. GRB 060801: Swift/XRT Astrometry Correction
  65. GRB 061028: Futher P200 Observations
  66. GRB 061028: P200 Observations
  67. GRB 061028: SARA upper limit
  68. GRB 061028: z band imaging
  69. GRB 061028: Swift/UVOT Observations
  70. GRB 061028, Swift-BAT refined analysis
  71. GRB 061028: TAROT Calern observatory optical observations
  72. GRB 061028: Swift detection of a burst
  73. GRB 061027, Swift refined analysis of a possible burst
  74. GRB 061027: Swift detection of a possible burst
  75. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  76. GRB061025: Swift/UVOT observations
  77. GRB 061025: REM observations
  78. GRB 061025: ROTSE-III Optical Limits
  79. Konus-Wind observation of GRB 061021
  80. GRB 061021: Swift-XRT refined analysis
  81. GRB 061021: Swift/UVOT Observation
  82. GRB 061021: Swift detection of a burst
  83. GRB060904b: optical observations
  84. GRB 061019: SARA upper limit
  85. GRB 061019: Swift/UVOT upper limit
  86. GRB 061019, Swift-BAT refined analysis
  87. GRB 061019: TAROT La Silla observatory optical observations
  88. GRB 061019: REM K-band candidate afterglow
  89. GRB 061007: Suzaku/WAM observation of the prompt emission
  90. GRB 061006: astrometry-corrected XRT position
  91. Konus-Wind observation of GRB 061007
  92. GRB061007: Swift UVOT followup observations
  93. GRB 061006: optical afterglow
  94. GRB 061006 : Suzaku/WAM observation of the prompt emission
  95. GRB 061007: OA fading and VLT redshift
  96. GRB 061007: Swift-BAT refined analysis
  97. GRB 061007: Swift XRT refined analysis
  98. GRB 061006: Swift/UVOT optical observations
  99. Konus-Wind observation of the short hard GRB 061006
  100. GRB 061007: Swift detection of a burst with an optical counterpart

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