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"

19343 results found.

  1. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  2. Konus-Wind observation of GRB 060117
  3. GRB 060117: Refined analysis of the Swift-BAT burst
  4. GRB 060117: FRAM optical afterglow candidate
  5. GRB 060117: Swift-BAT detection of a bright burst
  6. GRB 060116: Refined analysis of the Swift-BAT burst
  7. GRB 060116: Swift/UVOT upper limits
  8. GRB060115: REM observations
  9. GRB 060110: XRT position and analysis
  10. GRB 060116: ROTSE-III Optical Limits
  11. GRB060116: XRT position
  12. GRB060116: Faulkes North observation
  13. GRB 060116: Swift-BAT detection of a burst
  14. GRB 060115: Refined analysis of the Swift-BAT burst
  15. GRB 060115: Swift/UVOT upper limits
  16. GRB 060115: Swift XRT refined analysis
  17. GRB 060114: Swift/UVOT Observations
  18. GRB 060115: MITSuME optical afterglow candidate
  19. GRB 060115: Swift detection of a burst
  20. GRB 060114: Swift XRT upper limit
  21. GRB 060110: KAIT observations
  22. GRB 060111B: Swift XRT refined analysis
  23. GRB 060111A: refined UVOT anaysis
  24. GRB 060111B: TAROT optical observation
  25. GRB060111A: RTT150 optical observations
  26. GRB060111B: RTT150, possible host galaxy
  27. GRB 060111B: Refined analysis of the Swift-BAT burst
  28. GRB 060110: MARGE observations
  29. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  30. GRB 060111B: Swift detection of a burst
  31. GRB 060111: Swift-BAT Refined Analysis
  32. GRB 060111: TAROT optical observation
  33. GRB 060111: possible UVOT counterpart
  34. GRB060111 : XRT refined analysis
  35. GRB 060111: ROTSE-III Optical Limits
  36. GRB 060111: Swift detection of a burst
  37. GRB 060110: Swift-BAT refined analysis
  38. GRB 060109: Swift-BAT refined analysis
  39. GRB 060110a: RAPTOR detection of early optical emission.
  40. Correction to GRB 060109 XRT analysis
  41. GRB 060110: Swift-BAT detection of a burst
  42. GRB 060109: Refined Swift-XRT analysis
  43. GRB 060109: Swift/UVOT upper limits
  44. Swift UVOT correction to GCN 4455
  45. GRB 060109: Swift Detection of a long burst
  46. GRB 060108: Refined XRT analysis
  47. GRB 060108: VLT J-band observations
  48. GRB 060108: Swift/UVOT upper limits
  49. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  50. GRB060108: Faulkes Telescope observation
  51. GRB 060108: Refined analysis of the Swift-BAT burst
  52. GRB 060108: Swift XRT position
  53. GRB060108: Swift detection of its 100th GRB
  54. GRB 060105: Radio observations
  55. Konus-Wind observation of GRB 060105
  56. GRB 060105: Swift/UVOT upper limits
  57. GRB 060105: BAT refined analysis
  58. GRB 060105: XRT refined analysis
  59. GRB060105: Swift detection of a bright long burst
  60. Swift-BAT trigger 175653 is not an astrophysical source
  61. Swift-BAT trigger 175653 is probably not a GRB
  62. GRB 060102: Swift-BAT refined analysis
  63. Time Correction to GRB 060102
  64. GRB 060102: Swift-BAT detection of a burst
  65. GRB051211B: optical observations
  66. GRB051227: SARA Observations
  67. GRB 051221B: Optical Observations with Kuiper 1.54m
  68. GRB051221B: Radio observations
  69. GRB051227: Radio Observations
  70. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  71. GRB 051227: MDM Observation
  72. GRB 051227: Joint Swift-HETE Spectral Analysis
  73. GRB 051227: XRT refined analysis
  74. GRB 051227: Further analysis of the Swift-BAT burst
  75. GRB 051227: Refined analysis of the Swift-BAT burst
  76. GRB051227: SDSS pre-burst observations
  77. GRB 051227: Swift detection of a burst
  78. Konus-Wind observation of GRB 051221A
  79. GRB051221A: Suzaku WAM observation of the prompt emission
  80. GRB051016: analysis of the XMM-Newton observation
  81. GRB 051221A: Detection at 251nm with Swift UVOT
  82. GRB 051221A: Chandra Afterglow Position
  83. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  84. GRB 051221B: ROTSE-III Optical Limits
  85. GRB 051221B: TAROT optical limits
  86. GRB 051221A: WSRT Radio Observations
  87. GRB 051221B: Refined analysis of the Swift-BAT burst
  88. Possible GRB 051221B: MDM Optical Detection
  89. GRB 051221A: RAPTOR Fading Counterpart Constraint
  90. GRB 051221B: BOOTES optical observations.
  91. Possible GRB 051221B: Swift XRT position
  92. Swift-BAT detection of a possible burst
  93. GRB 051221: Swift XRT refined analysis
  94. GRB 051221: Swift/UVOT upper limits
  95. GRB 051221: XRT position
  96. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  97. GRB 051221: Swift detection of a bright short burst
  98. Refined analysis of the SWIFT J1626.6-5156
  99. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  100. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg

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