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"

27323 results found.

  1. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  2. GRB071020 - SDSS Pre-burst Observations
  3. GRB 071020: Swift detection of a bright burst
  4. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  5. GRB 071018: Mercator Telescope optical observations
  6. Swift autonomous slewing re-enabled
  7. GRB 071018: SARA observations
  8. GRB 071018: Swift-XRT observation
  9. GRB 071017 - Swift XRT observations
  10. GRB 071018: Possible OT from Xinglong TNT observation
  11. GRB 071010B: Light Curve Break Confirmed
  12. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  13. GRB 071018, Swift-BAT refined analysis
  14. GRB 071010B: Suzaku WAM observation of the prompt emission
  15. GRB 071013: 3rd TLS Epoch - constraints on variability
  16. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  17. GRB 071010B: Optical observations of EST
  18. GRB 071011: MITSuME Optical Observations
  19. GRB 070920A: deep optical observations at the NOT
  20. GRB 071010B: Keck/LRIS Photometry
  21. GRB 071013: TLS Upper Limit
  22. VLA non-detection of GRB 071011
  23. GRB 071013: Optical observations
  24. GRB 071013: optical observations at NOT
  25. GRB 071013, Swift-BAT refined analysis
  26. GRB071010B, BVRcIc field calibration
  27. GRB 20071013: Xinglong TNT optical Upper Limit
  28. GRB 071010C Swift-BAT detection of a burst
  29. GRB 071011: Optical Limit after 13.95hrs
  30. GRB 071010B correction to GCN 6892 optical observations
  31. GRB 071011: Swift-XRT refined analysis
  32. VLA non-detection of GRB 071010A
  33. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  34. GRB 071011: Confirmation of P60 optical afterglow
  35. GRB 071010B: Optical Detection
  36. GRB 071011: Kanazawa Optical limits
  37. GRB 071011: P60 Optical Afterglow Candidate
  38. GRB 071011: MARGE Optical Limits
  39. GRB 071010B: Super-LOTIS upper limit
  40. GRB 071010B optical photometry
  41. GRB 071011: XRT afterglow detection
  42. GRB 071011, Swift-BAT refined analysis
  43. GRB 071010B: Gemini Spectroscopic Observations
  44. GRB 071011: NAYUTA Optical Observation
  45. GRB 071010A: Continued Keck Imaging
  46. GRB 071010B: Bright OT confirmed with TLS
  47. GRB 071011: Swift detection of a burst
  48. Optical Observation: GRB 071010
  49. Optical observations: GRB 071010A
  50. Konus-Wind observation of GRB 071010B
  51. GRB071010B: Swift/XRT detection
  52. GRB 071010B, Swift-BAT refined analysis
  53. GRB 071010A: bright NIR afterglow
  54. GRB 071006, Swift-BAT refined analysis
  55. GRB 071010A: Keck/LRIS Photometry
  56. GRB 071008, Swift-BAT refined analysis
  57. GRB 071010, Swift-BAT refined analysis
  58. GRB 071010 REM NIR observations
  59. GRB 071010: TAROT La Silla observatory detection of the afterglow
  60. GRB 071008: Swift detection of a burst
  61. GRB 071003: XRT refined analysis
  62. GRB070920A: MAGIC telescope GeV observation
  63. Radio detection of GRB 071003 with the VLA
  64. GRB 070810B: further XRT analysis
  65. GRB 071003: Possible rebrightening
  66. GRB 071003 : Lulin R-band observations
  67. GRB 071003: Keck HIRES spectroscopy
  68. GRB 071003, Swift-BAT refined analysis
  69. GRB 071003: P60 Confirmation of Optical Afterglow
  70. GRB 071001: Swift-XRT Team refined analysis
  71. GRB 071001, Swift-BAT refined analysis
  72. Faulkes Telescope South observations of GRB 071001
  73. GRB 071001: Swift detection of a burst
  74. VLA observation of GRB 070923
  75. GRB 070911, SMARTS optical/IR afterglow observations
  76. GRB 070925: Gemini South Imaging
  77. GRB070925: Swift-XRT Position
  78. GRB 070920B: ROTSE-III Early Optical Limits
  79. GRB 070925: a long GRB detected by INTEGRAL
  80. GRB 070923, Swift-BAT refined analysis
  81. GRB 070920B: XRT observations
  82. GRB 070917: Suzaku/WAM observation of the prompt emission
  83. GRB 070920B: TAROT La Silla observatory optical observations
  84. GRB 070920B, Swift-BAT refined analysis
  85. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  86. GRB 070920B: NOT optical observations
  87. GRB 070920, Swift-BAT refined analysis
  88. GRB 070920: TAROT Calern observatory optical observations
  89. GRB 070917: P60 Observations
  90. Konus-Wind observation of GRB 070917
  91. Swift Status and XRT Calibration Uncertainties
  92. GRB 070917: Swift-XRT observations
  93. GRB 070917: MITSuME Akeno Ic upper limit
  94. GRB 070917: R band observations
  95. GRB 070917, Swift-BAT refined analysis
  96. GRB 070911: Suzaku WAM observation of the prompt emission
  97. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  98. GRB 070809: The Swift evidence for the SHB nature of this burst
  99. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  100. GRB 070913: Swift-BAT refined analysis

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