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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"

38663 results found.

  1. GRB 071010B: Suzaku WAM observation of the prompt emission
  2. GRB 071013: 3rd TLS Epoch - constraints on variability
  3. GRB 071013: TNT optical data refined analysis
  4. GRB 071010B: Keck/DEIMOS emission-line redshift
  5. GRB 071017: a SHORT GRB detected by INTEGRAL
  6. GRB071013: optical observations
  7. GRB 071011: MITSuME Optical Observations
  8. GRB 070920A: deep optical observations at the NOT
  9. GRB 071010B: Photometry after 1.6 days
  10. GRB 071010B: Keck/LRIS Photometry
  11. VLA detection of radio afterglow of GRB 071010B
  12. VLA non-detection of GRB 071011
  13. GRB 071013: Optical observations
  14. GRB 071013: optical observations at NOT
  15. GRB071013: optical limit
  16. GRB071010B, BVRcIc field calibration
  17. GRB 20071013: Xinglong TNT optical Upper Limit
  18. GRB 071013: Swift detection of a burst
  19. GRB 071010C Swift-BAT detection of a burst
  20. GRB 071011: Optical Limit after 13.95hrs
  21. GRB 071011: Xinglong TNT Optical afterglow observations
  22. GRB 071010B correction to GCN 6892 optical observations
  23. GRB 071011: Swift-XRT refined analysis
  24. VLA non-detection of GRB 071010A
  25. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  26. GRB 071011, Optical afterglow
  27. GRB 071010B: Optical Detection
  28. GRB 071011: Kanazawa Optical limits
  29. GRB 071011: P60 Optical Afterglow Candidate
  30. GRB 071011: MARGE Optical Limits
  31. GRB 071010B: Super-LOTIS upper limit
  32. GRB 071010B optical photometry
  33. GRB 071011: XRT afterglow detection
  34. GRB 071010B: Keck/LRIS Spectroscopy
  35. GRB 071010B: Gemini Spectroscopic Observations
  36. GRB 071011: Early Super-LOTIS Observations
  37. GRB 071011: NAYUTA Optical Observation
  38. GRB 071010A: Continued Keck Imaging
  39. GRB 071010B: Bright OT confirmed with TLS
  40. GRB 071011: Swift detection of a burst
  41. Optical Observation: GRB 071010
  42. Optical observations: GRB 071010A
  43. Konus-Wind observation of GRB 071010B
  44. GRB071010B: Swift/XRT detection
  45. GRB 071010B, Swift-BAT refined analysis
  46. GRB 071010A: bright NIR afterglow
  47. GRB 071006, Swift-BAT refined analysis
  48. GRB071008: optical observations
  49. GRB 071010B: Swift detection of a burst
  50. GRB 071010: Swift-XRT observation
  51. Konus-Wind observation of GRB 071006
  52. GRB071008: Swift-XRT observation
  53. GRB 071010 REM NIR observations
  54. GRB 071010: Keck/LRIS Spectroscopy
  55. GRB 071010: Swift detection of a burst
  56. GRB 071006 Swift-BAT detection of a burst
  57. GRB071008: IAC80 observation
  58. GRB 071008: Swift detection of a burst
  59. GRB 071003: XRT refined analysis
  60. GRB070920A: MAGIC telescope GeV observation
  61. Radio detection of GRB 071003 with the VLA
  62. GRB 070810B: further XRT analysis
  63. GRB 071003: VLT spectroscopy
  64. GRB 071003: Keck spectroscopy
  65. Konus-Wind observation of GRB 071003
  66. GRB 071003: Possible rebrightening
  67. GRB 071003 : Lulin R-band observations
  68. GRB 071003: Swift XRT position
  69. GRB 071003: OA power-law decay indices from KAIT
  70. GRB 071003: Keck HIRES spectroscopy
  71. GRB 071003: MARGE Observations
  72. GRB 071003 Optical observations
  73. GRB 071003: P60 Confirmation of Optical Afterglow
  74. GRB 071003: KAIT optical afterglow observations
  75. GRB 071003: Swift detection of a bright burst
  76. GRB 070714B: host galaxy spectroscopic redshift
  77. GRB 071001: Swift-XRT Team refined analysis
  78. Faulkes Telescope South observations of GRB 071001
  79. GRB 071001: Swift detection of a burst
  80. VLA observation of GRB 070923
  81. GRB 070911, SMARTS optical/IR afterglow observations
  82. GRB070925: Swift-XRT Afterglow confirmation
  83. GRB 070925: Gemini South Imaging
  84. GRB070925: Swift-XRT Position
  85. Update on Swift Status
  86. GRB 070920B: ROTSE-III Early Optical Limits
  87. GRB 070925: a long GRB detected by INTEGRAL
  88. Recent SGR1806-20 Activity
  89. GRB 070920B: XRT observations
  90. GRB 070923: Swift detection of a short hard burst
  91. GRB 070917: Suzaku/WAM observation of the prompt emission
  92. INTEGRAL ToO observations of SGR1806-20
  93. GRB 070920b, SMARTS optical observation
  94. GRB 070917: Confirmation of the X-ray afterglow
  95. GRB 070920b: LCO optical observations
  96. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  97. GRB 070920B: Swift detection of a burst
  98. GRB 070920: Swift detection of a burst
  99. SGR1806-20: Swift-BAT detection of enhanced activity
  100. GRB070917: Confirmation of optical afterglow

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