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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"

27297 results found.

  1. Swift UVOT upper limits of GRB071112B
  2. GRB 071112B: Swift-XRT preliminary analysis
  3. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  4. Swift-BAT trigger 296491 is not a GRB
  5. GRB 071112C: TAROT Calern observatory optical observations
  6. Swift XRT follow-up observations of GRB071028B
  7. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  8. GRB 071112B: ROTSE-III Rapid Optical Limits
  9. GRB 071112C: Swift detection of a burst with an optical counterpart
  10. GRB 071112B: Swift detection of a short hard burst
  11. GRB 071112: Swift detection of a possible burst
  12. VLA IInd observation of INTEGRAL burst GRB 071109
  13. Swift/UVOT initial analysis of GRB071109
  14. GRB 071109: further Swift-XRT analysis
  15. No radio detection at Swift-XRT position
  16. GRB 071109: Swift-XRT possible X-ray counterpart
  17. VLA prompt radio detection of the INTEGRAL burst 071109
  18. GRB 071104: Swift-XRT Team Refined Analysis
  19. GRB 071104: Possible Swift UVOT Afterglow Candidate
  20. GRB 071104: Swift-XRT position
  21. Swift XRT and UVOT observations of GRB071028B
  22. GRB 071101, Swift-BAT refined analysis
  23. GRB 071101: Swift-XRT Team refined analysis
  24. GRB 071101: TAROT Calern observatory optical observations
  25. GRB 071101: Swift XRT position
  26. GRB 071101: BOOTES-2 prompt optical observations
  27. GRB 071101: a nearby galaxy
  28. GRB 071101: Swift detection of a burst
  29. GRB 071031, Swift-BAT refined analysis
  30. GRB 071031: Swift/UVOT detection of afterglow
  31. GRB 071031: Swift-XRT Team refined analysis
  32. GRB 071031: VLT high-resolution spectroscopy
  33. GRB 071031: GROND detection in all bands
  34. GRB 071031: Swift detection of a burst with an optical counterpart
  35. GRB 071028B Swift-BAT detection of a burst
  36. GRB 071028: SARA observations of variable source
  37. Swift UVOT upper limits to GRB071028
  38. GRB 071028: Swift-XRT Team refined analysis
  39. GRB 071028, Swift-BAT refined analysis
  40. GRB 071028: Swift detection of a burst
  41. GRB 071025: Kuiper Telescope Optical Observations
  42. GRB 071018: Revised BAT position
  43. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  44. GRB071021: MARGE Optical Limits
  45. GRB071020, optical upper limit
  46. GRB 071025 Milagro GeV/TeV Observations
  47. Swift UVOT upper limits
  48. GRB 071025: Swift-XRT Team refined analysis
  49. GRB 071025, Swift-BAT refined analysis
  50. GRB 071025: Early Super-LOTIS Observations
  51. GRB 071025: R/I-band update
  52. GRB 071025: ROTSE-III Refined Analysis
  53. GRB 071025: I-detection, R-dropout?
  54. GRB 071025: Swift XRT refined position
  55. GRB 071025: ROTSE-III Detection of Optical Counterpart
  56. GRB 071025: Swift detection of a burst
  57. GRB 071021: R-band detection and analysis
  58. GRB 071020: BTA spectroscopy
  59. GRB071021: Optical+NIR observations
  60. Possible radio detection of GRB 071021 with the VLA
  61. Optical observations of GRB 071020
  62. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  63. Radio detection of GRB 071020 with the VLA
  64. GRB 071021: Magellan i-band observation
  65. GRB 071021: Z-band detection
  66. GRB 071010B: Fading quickly
  67. GRB 071021: optical and NIR observations
  68. GRB 071021: possible high-z burst
  69. GRB 071021, Swift-BAT refined analysis
  70. GRB 071021: Swift-XRT Team refined analysis
  71. Konus-Wind observation of GRB 071020
  72. GRB 071021: Swift detection of a burst
  73. GRB 071020: Swift-XRT refined analysis
  74. GRB 071020, Swift-BAT refined analysis
  75. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  76. GRB071020 - SDSS Pre-burst Observations
  77. GRB 071020: Swift detection of a bright burst
  78. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  79. GRB 071018: Mercator Telescope optical observations
  80. Swift autonomous slewing re-enabled
  81. GRB 071018: Swift-XRT observation
  82. GRB 071017 - Swift XRT observations
  83. VLA radio observation of GRB 071018
  84. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  85. GRB 071018, Swift-BAT refined analysis
  86. GRB 071018?: Swift detection of a possible burst
  87. GRB 071010B: Suzaku WAM observation of the prompt emission
  88. GRB 071013: 3rd TLS Epoch - constraints on variability
  89. GRB 071010B: Keck/DEIMOS emission-line redshift
  90. GRB 071013: TLS Upper Limit
  91. VLA detection of radio afterglow of GRB 071010B
  92. VLA non-detection of GRB 071011
  93. GRB 071013: Optical observations
  94. GRB 071013, Swift-BAT refined analysis
  95. GRB 071013: Swift detection of a burst
  96. GRB 071010C Swift-BAT detection of a burst
  97. GRB 071011: Swift-XRT refined analysis
  98. VLA non-detection of GRB 071010A
  99. GRB 071011, Optical afterglow
  100. GRB 071010B: Optical Detection

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