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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"

21455 results found.

  1. Swift UVOT upper limits to GRB071028
  2. GRB071028: Xinglong EST V-band upper limit
  3. GRB 071028: Swift-XRT Team refined analysis
  4. GRB 071028, Swift-BAT refined analysis
  5. GRB 071028: Swift detection of a burst
  6. GRB 071025: Kuiper Telescope Optical Observations
  7. GRB 071018: Revised BAT position
  8. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  9. GRB071021: MARGE Optical Limits
  10. GRB071020, optical upper limit
  11. GRB 071025 Milagro GeV/TeV Observations
  12. Swift UVOT upper limits
  13. GRB071025: Xinglong TNT I-band upper limit
  14. GRB 071025: Swift-XRT Team refined analysis
  15. GRB 071025, Swift-BAT refined analysis
  16. GRB 071025: Early Super-LOTIS Observations
  17. GRB 071025: ROTSE-III Refined Analysis
  18. GRB 071025: Swift XRT refined position
  19. GRB071025: REM NIR afterglow
  20. GRB 071025: ROTSE-III Detection of Optical Counterpart
  21. GRB 071025: Swift detection of a burst
  22. GRB 071020: BTA spectroscopy
  23. Possible radio detection of GRB 071021 with the VLA
  24. Radio detection of GRB 071020 with the VLA
  25. GRB 071021: Subaru NIR observation
  26. GRB071021: MITSuME Okayama Optical Upper Limits
  27. GRB 071021: Magellan i-band observation
  28. GRB 071021: Magellan R-band observation
  29. GRB 071021: optical and NIR observations
  30. GRB 071021, Swift-BAT refined analysis
  31. GRB071018: 2nd epoch obsevations of Xinglong TNT
  32. GRB 071021: Swift-XRT Team refined analysis
  33. GRB 071021: Xinglong TNT optical Upper Limit
  34. GRB 071021 : Lulin R-band limit
  35. Konus-Wind observation of GRB 071020
  36. GRB 071021: Faulkes Telescope South optical candidate
  37. GRB 071021: Swift detection of a burst
  38. GRB 071020: Swift-XRT refined analysis
  39. GRB 071020, Swift-BAT refined analysis
  40. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  41. GRB071020 - SDSS Pre-burst Observations
  42. GRB 071020: Swift detection of a bright burst
  43. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  44. GRB 071018: Mercator Telescope optical observations
  45. Swift autonomous slewing re-enabled
  46. GRB 071018: SARA observations
  47. GRB 071018: Swift-XRT observation
  48. GRB 071017 - Swift XRT observations
  49. VLA radio observation of GRB 071018
  50. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  51. GRB 071018, Swift-BAT refined analysis
  52. GRB 071018?: Swift detection of a possible burst
  53. GRB 071010B: Suzaku WAM observation of the prompt emission
  54. GRB 071013: 3rd TLS Epoch - constraints on variability
  55. GRB 071013: TLS Upper Limit
  56. VLA detection of radio afterglow of GRB 071010B
  57. VLA non-detection of GRB 071011
  58. GRB 071013: Optical observations
  59. GRB 071013, Swift-BAT refined analysis
  60. GRB 071013: Swift detection of a burst
  61. GRB 071010C Swift-BAT detection of a burst
  62. GRB 071011: Swift-XRT refined analysis
  63. VLA non-detection of GRB 071010A
  64. GRB 071011, Optical afterglow
  65. GRB 071011: Confirmation of P60 optical afterglow
  66. GRB 071011: Kanazawa Optical limits
  67. GRB 071011: P60 Optical Afterglow Candidate
  68. GRB 071011: MARGE Optical Limits
  69. GRB 071011: XRT afterglow detection
  70. GRB 071011, Swift-BAT refined analysis
  71. GRB 071011: Early Super-LOTIS Observations
  72. GRB 071010B: Bright OT confirmed with TLS
  73. GRB 071011: Swift detection of a burst
  74. Optical Observation: GRB 071010
  75. Optical observations: GRB 071010A
  76. Konus-Wind observation of GRB 071010B
  77. GRB071010B: Swift/XRT detection
  78. GRB 071010B, Swift-BAT refined analysis
  79. GRB 071006, Swift-BAT refined analysis
  80. GRB071008: optical observations
  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: TAROT La Silla observatory detection of the afterglow
  87. GRB 071010: Swift detection of a burst
  88. GRB 071006 Swift-BAT detection of a burst
  89. GRB071008: IAC80 observation
  90. GRB 071008: Swift detection of a burst
  91. GRB 071003: XRT refined analysis
  92. GRB070920A: MAGIC telescope GeV observation
  93. Radio detection of GRB 071003 with the VLA
  94. GRB 070810B: further XRT analysis
  95. Konus-Wind observation of GRB 071003
  96. GRB 071003: Swift XRT position
  97. GRB 071003, Swift-BAT refined analysis
  98. GRB 071003: MARGE Observations
  99. GRB 071003 Optical observations
  100. GRB 071003: KAIT optical afterglow observations

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