Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

26128 results found.

  1. GRB071021: MITSuME Okayama Optical Upper Limits
  2. GRB 071021: Magellan i-band observation
  3. GRB 071021: Magellan R-band observation
  4. GRB 071020: Fading slowly?
  5. GRB 071010B: Fading quickly
  6. GRB 071021: optical and NIR observations
  7. GRB 071021: possible high-z burst
  8. GRB 071021, Swift-BAT refined analysis
  9. GRB071018: 2nd epoch obsevations of Xinglong TNT
  10. GRB 071021: Swift-XRT Team refined analysis
  11. GRB 071021: Xinglong TNT optical Upper Limit
  12. GRB 071021 : Lulin R-band limit
  13. Konus-Wind observation of GRB 071020
  14. GRB 071021: Faulkes Telescope South optical candidate
  15. GRB 071021: Swift detection of a burst
  16. GRB071020A: Xinglong TNT Optical afterglow observations
  17. GRB 071020: Swift-XRT refined analysis
  18. GRB 071020, Swift-BAT refined analysis
  19. GRB 071020: VLT spectroscopy
  20. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  21. GRB071020 - SDSS Pre-burst Observations
  22. GRB 071020: Swift detection of a bright burst
  23. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  24. GRB 071018: Mercator Telescope optical observations
  25. Swift autonomous slewing re-enabled
  26. GRB071010b: optical observations
  27. GRB 071018: SARA observations
  28. GRB 071018: Swift-XRT observation
  29. GRB 071017 - Swift XRT observations
  30. VLA radio observation of GRB 071018
  31. GRB 071010B: Light Curve Break Confirmed
  32. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  33. GRB 071018, Swift-BAT refined analysis
  34. GRB 071018?: Swift detection of a possible burst
  35. GRB 071010B: Suzaku WAM observation of the prompt emission
  36. GRB 071013: 3rd TLS Epoch - constraints on variability
  37. GRB 071010B: Keck/DEIMOS emission-line redshift
  38. GRB071013: optical observations
  39. GRB 071010B: Optical observations of EST
  40. GRB 071010B: TLS 3rd Epoch - finally a break??
  41. GRB 071011: MITSuME Optical Observations
  42. GRB 071010B: Keck/LRIS Photometry
  43. GRB 071010B: TLS 2nd Epoch, refined analysis
  44. GRB 071013: TLS Upper Limit
  45. VLA detection of radio afterglow of GRB 071010B
  46. VLA non-detection of GRB 071011
  47. GRB 071013: Optical observations
  48. GRB 071013: optical observations at NOT
  49. GRB 071013, Swift-BAT refined analysis
  50. GRB 071013: Swift detection of a burst
  51. GRB 071010C Swift-BAT detection of a burst
  52. GRB 071011: Xinglong TNT Optical afterglow observations
  53. GRB 071010B correction to GCN 6892 optical observations
  54. GRB 071011: Swift-XRT refined analysis
  55. VLA non-detection of GRB 071010A
  56. GRB 071011, Optical afterglow
  57. GRB 071011: Confirmation of P60 optical afterglow
  58. GRB 071011: Kanazawa Optical limits
  59. GRB 071011: P60 Optical Afterglow Candidate
  60. GRB 071011: MARGE Optical Limits
  61. GRB 071010B optical photometry
  62. GRB 071011: XRT afterglow detection
  63. GRB 071010B: Keck/LRIS Spectroscopy
  64. GRB 071011, Swift-BAT refined analysis
  65. GRB 071010B: Gemini Spectroscopic Observations
  66. GRB 071011: Early Super-LOTIS Observations
  67. GRB 071011: NAYUTA Optical Observation
  68. GRB 071010A: Continued Keck Imaging
  69. GRB 071010B: Bright OT confirmed with TLS
  70. GRB 071011: Optical afterglow candidate
  71. GRB 071011: Swift detection of a burst
  72. Optical Observation: GRB 071010
  73. Optical observations: GRB 071010A
  74. Konus-Wind observation of GRB 071010B
  75. GRB071010B: Swift/XRT detection
  76. GRB 071010B, Swift-BAT refined analysis
  77. GRB 071010A: bright NIR afterglow
  78. GRB 071006, Swift-BAT refined analysis
  79. GRB071008: optical observations
  80. GRB 071010A: Keck/LRIS Photometry
  81. GRB 071010B: Swift detection of a burst
  82. GRB 071010: Swift-XRT observation
  83. GRB 071008, Swift-BAT refined analysis
  84. GRB 071010, Swift-BAT refined analysis
  85. GRB071008: Swift-XRT observation
  86. GRB 071010 REM NIR observations
  87. GRB 071010: Keck/LRIS Spectroscopy
  88. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  89. GRB 071010: Rapid PROMPT Detections
  90. GRB 071010: Keck Observations of the Afterglow
  91. GRB 071010: TAROT La Silla observatory detection of the afterglow
  92. GRB 071010: Swift detection of a burst
  93. GRB 071006 Swift-BAT detection of a burst
  94. GRB071008: IAC80 observation
  95. GRB 071008: Swift detection of a burst
  96. GRB 071003: XRT refined analysis
  97. GRB070920A: MAGIC telescope GeV observation
  98. Radio detection of GRB 071003 with the VLA
  99. GRB 070810B: further XRT analysis
  100. GRB 071003: VLT spectroscopy

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