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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"

21983 results found.

  1. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  2. GRB 071025: SARA VRI upper limits
  3. GRB 071025 Milagro GeV/TeV Observations
  4. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  5. Swift UVOT upper limits
  6. GRB 060602A: host redshift
  7. GRB 071025: Early Super-LOTIS Observations
  8. GRB071021 : CFHT Ks-band observation
  9. GRB 071025: ROTSE-III Refined Analysis
  10. GRB 071025a: PAIRITEL observations
  11. GRB071025: REM NIR afterglow
  12. GRB 071025: ROTSE-III Detection of Optical Counterpart
  13. GRB 071021: R-band detection and analysis
  14. GRB071021: Optical+NIR observations
  15. Possible radio detection of GRB 071021 with the VLA
  16. Optical observations of GRB 071020
  17. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  18. GRB 071020: SARA observations
  19. Radio detection of GRB 071020 with the VLA
  20. GRB 071021: Subaru NIR observation
  21. GRB071021: MITSuME Okayama Optical Upper Limits
  22. GRB 071021: Magellan i-band observation
  23. GRB 071021: Magellan R-band observation
  24. GRB 071020: Fading slowly?
  25. GRB 071021: optical and NIR observations
  26. GRB 071021: possible high-z burst
  27. GRB 071021 : Lulin R-band limit
  28. GRB 071021: Faulkes Telescope South optical candidate
  29. GRB 071010B: Independent Confirmation of Break
  30. GRB071020A: Xinglong TNT Optical afterglow observations
  31. GRB 071020: Swift-XRT refined analysis
  32. GRB 071020: VLT spectroscopy
  33. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  34. GRB071020 - SDSS Pre-burst Observations
  35. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  36. GRB 071018: Mercator Telescope optical observations
  37. Swift autonomous slewing re-enabled
  38. GRB071010b: optical observations
  39. GRB 071018: SARA observations
  40. GRB 071018: Swift-XRT observation
  41. GRB 071017 - Swift XRT observations
  42. GRB 071018: Possible OT from Xinglong TNT observation
  43. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  44. GRB 071018?: Swift detection of a possible burst
  45. GRB 071013: 3rd TLS Epoch - constraints on variability
  46. GRB 071010B: Keck/DEIMOS emission-line redshift
  47. GRB071013: optical observations
  48. GRB 071010B: Optical observations of EST
  49. GRB 071011: MITSuME Optical Observations
  50. GRB 070920A: deep optical observations at the NOT
  51. GRB 071010B: Keck/LRIS Photometry
  52. GRB 071010B: TLS 2nd Epoch, refined analysis
  53. GRB 071013: Optical observations
  54. GRB 071013: optical observations at NOT
  55. GRB 071011: Xinglong TNT Optical afterglow observations
  56. GRB 071010B correction to GCN 6892 optical observations
  57. GRB 071011: Swift-XRT refined analysis
  58. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  59. GRB 071011, Optical afterglow
  60. GRB 071011: P60 Optical Afterglow Candidate
  61. GRB 071010B optical photometry
  62. GRB 071010B: Gemini Spectroscopic Observations
  63. GRB 071011: Early Super-LOTIS Observations
  64. GRB 071011: Optical afterglow candidate
  65. Optical Observation: GRB 071010
  66. Optical observations: GRB 071010A
  67. GRB 071010A: bright NIR afterglow
  68. GRB071008: optical observations
  69. GRB 071010B possible optical transient
  70. GRB 071010B: Swift detection of a burst
  71. GRB071008: Swift-XRT observation
  72. GRB 071010 REM NIR observations
  73. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  74. GRB 071010: Keck Observations of the Afterglow
  75. GRB 071010: TAROT La Silla observatory detection of the afterglow
  76. GRB 071010: Swift detection of a burst
  77. GRB 071008: Swift detection of a burst
  78. GRB 071003: XRT refined analysis
  79. Radio detection of GRB 071003 with the VLA
  80. GRB 070810B: further XRT analysis
  81. GRB 071003: VLT spectroscopy
  82. GRB 071003: Keck spectroscopy
  83. GRB071003: Faulkes Telescope North observations
  84. GRB 071003: Possible rebrightening
  85. GRB 071003 : Lulin R-band observations
  86. GRB 071003: OA power-law decay indices from KAIT
  87. GRB 071003: Keck HIRES spectroscopy
  88. GRB 071003: MARGE Observations
  89. GRB 071003 Optical observations
  90. GRB 071003: P60 Confirmation of Optical Afterglow
  91. GRB 071003: KAIT optical afterglow observations
  92. GRB 071003: Swift detection of a bright burst
  93. GRB 070714B: host galaxy spectroscopic redshift
  94. GRB 071001: Swift-XRT Team refined analysis
  95. Faulkes Telescope South observations of GRB 071001
  96. GRB 070911, SMARTS optical/IR afterglow observations
  97. GRB070925: Swift-XRT Afterglow confirmation
  98. GRB070925: Swift-XRT Position
  99. Update on Swift Status
  100. Recent SGR1806-20 Activity

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