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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"

28044 results found.

  1. GRB 071025: ROTSE-III Detection of Optical Counterpart
  2. GRB 071025: Swift detection of a burst
  3. GRB 071021: R-band detection and analysis
  4. Possible radio detection of GRB 071021 with the VLA
  5. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  6. GRB 071020: SARA observations
  7. Radio detection of GRB 071020 with the VLA
  8. GRB071021: MITSuME Okayama Optical Upper Limits
  9. GRB 071021: Z-band detection
  10. GRB 071021: optical and NIR observations
  11. GRB 071021: possible high-z burst
  12. GRB 071021, Swift-BAT refined analysis
  13. GRB071018: 2nd epoch obsevations of Xinglong TNT
  14. GRB 071021: Swift-XRT Team refined analysis
  15. GRB 071021: Xinglong TNT optical Upper Limit
  16. GRB 071021 : Lulin R-band limit
  17. GRB 071021: Swift detection of a burst
  18. GRB071020A: Xinglong TNT Optical afterglow observations
  19. GRB 071020: Swift-XRT refined analysis
  20. GRB 071020, Swift-BAT refined analysis
  21. GRB 071020A: IR Imaging with PAIRITEL
  22. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  23. GRB071020 - SDSS Pre-burst Observations
  24. GRB 071020: Swift detection of a bright burst
  25. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  26. GRB 071018: Mercator Telescope optical observations
  27. Swift autonomous slewing re-enabled
  28. GRB 071018: SARA observations
  29. GRB 071018: Swift-XRT observation
  30. GRB 071017 - Swift XRT observations
  31. GRB 071018: Possible OT from Xinglong TNT observation
  32. GRB 071010B: Light Curve Break Confirmed
  33. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  34. GRB 071018, Swift-BAT refined analysis
  35. GRB 071010B: Suzaku WAM observation of the prompt emission
  36. GRB 071013: 3rd TLS Epoch - constraints on variability
  37. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  38. GRB 071010B: Optical observations of EST
  39. GRB 071011: MITSuME Optical Observations
  40. GRB 070920A: deep optical observations at the NOT
  41. GRB 071010B: Keck/LRIS Photometry
  42. GRB 071013: TLS Upper Limit
  43. VLA non-detection of GRB 071011
  44. GRB 071013: Optical observations
  45. GRB 071013: optical observations at NOT
  46. GRB 071013, Swift-BAT refined analysis
  47. GRB071010B, BVRcIc field calibration
  48. GRB 20071013: Xinglong TNT optical Upper Limit
  49. GRB 071010C Swift-BAT detection of a burst
  50. GRB 071011: Optical Limit after 13.95hrs
  51. GRB 071010B correction to GCN 6892 optical observations
  52. GRB 071011: Swift-XRT refined analysis
  53. VLA non-detection of GRB 071010A
  54. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  55. GRB 071011: Confirmation of P60 optical afterglow
  56. GRB 071010B: Optical Detection
  57. GRB 071011: Kanazawa Optical limits
  58. GRB 071011: P60 Optical Afterglow Candidate
  59. GRB 071011: MARGE Optical Limits
  60. GRB 071010B: Super-LOTIS upper limit
  61. GRB 071010B optical photometry
  62. GRB 071011: XRT afterglow detection
  63. GRB 071011, Swift-BAT refined analysis
  64. GRB 071010B: Gemini Spectroscopic Observations
  65. GRB 071011: NAYUTA Optical Observation
  66. GRB 071010A: Continued Keck Imaging
  67. GRB 071010B: Bright OT confirmed with TLS
  68. GRB 071011: Swift detection of a burst
  69. Optical Observation: GRB 071010
  70. Optical observations: GRB 071010A
  71. Konus-Wind observation of GRB 071010B
  72. GRB071010B: Swift/XRT detection
  73. GRB 071010B, Swift-BAT refined analysis
  74. GRB 071010A: bright NIR afterglow
  75. GRB 071006, Swift-BAT refined analysis
  76. GRB 071010A: Keck/LRIS Photometry
  77. GRB 071008, Swift-BAT refined analysis
  78. GRB 071010, Swift-BAT refined analysis
  79. GRB 071010 REM NIR observations
  80. GRB 071010: TAROT La Silla observatory detection of the afterglow
  81. GRB 071008: Swift detection of a burst
  82. GRB 071003: XRT refined analysis
  83. GRB070920A: MAGIC telescope GeV observation
  84. Radio detection of GRB 071003 with the VLA
  85. GRB 070810B: further XRT analysis
  86. GRB 071003: Possible rebrightening
  87. GRB 071003 : Lulin R-band observations
  88. GRB 071003: Keck HIRES spectroscopy
  89. GRB 071003, Swift-BAT refined analysis
  90. GRB 071003: P60 Confirmation of Optical Afterglow
  91. GRB 071001: Swift-XRT Team refined analysis
  92. GRB 071001, Swift-BAT refined analysis
  93. Faulkes Telescope South observations of GRB 071001
  94. GRB 071001: Swift detection of a burst
  95. VLA observation of GRB 070923
  96. GRB 070911, SMARTS optical/IR afterglow observations
  97. GRB 070925: Gemini South Imaging
  98. GRB070925: Swift-XRT Position
  99. GRB 070920B: ROTSE-III Early Optical Limits
  100. GRB 070925: a long GRB detected by INTEGRAL

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