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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"

21393 results found.

  1. GRB 071112B: Gemini Optical Imaging
  2. GRB 071112B: Swift-XRT preliminary analysis
  3. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  4. GRB 071112C: Palomar Pre-Imaging
  5. Swift-BAT trigger 296491 is not a GRB
  6. GRB 071112C: TAROT Calern observatory optical observations
  7. Swift XRT follow-up observations of GRB071028B
  8. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  9. GRB 071112B: ROTSE-III Rapid Optical Limits
  10. GRB 071112C: Swift detection of a burst with an optical counterpart
  11. GRB 071112B: Swift detection of a short hard burst
  12. GRB 071112: Swift detection of a possible burst
  13. GRB071109: Super-LOTIS observations
  14. VLA IInd observation of INTEGRAL burst GRB 071109
  15. Swift/UVOT initial analysis of GRB071109
  16. GRB 071109: further Swift-XRT analysis
  17. No radio detection at Swift-XRT position
  18. GRB 071109: Swift-XRT possible X-ray counterpart
  19. GRB 071104: Swift-XRT Team Refined Analysis
  20. GRB 071104: Possible Swift UVOT Afterglow Candidate
  21. GRB 071104: Swift-XRT position
  22. Swift XRT and UVOT observations of GRB071028B
  23. GRB 071101, Swift-BAT refined analysis
  24. GRB 071101: Swift-XRT Team refined analysis
  25. GRB071101: Optical and NIR upper limits by KANATA
  26. GRB0711101: Two new source from Xinglong TNT observation
  27. GRB 071101: TAROT Calern observatory optical observations
  28. GRB 071101: Swift XRT position
  29. GRB 071101: BOOTES-2 prompt optical observations
  30. GRB 071101: a nearby galaxy
  31. GRB 071101: Swift detection of a burst
  32. GRB 071031, Swift-BAT refined analysis
  33. GRB 071031: Swift/UVOT detection of afterglow
  34. GRB 071031: Swift-XRT Team refined analysis
  35. GRB 071031: GROND detection in all bands
  36. GRB 071031: Swift detection of a burst with an optical counterpart
  37. GRB 071028B Swift-BAT detection of a burst
  38. GRB 071028: SARA observations of variable source
  39. Swift UVOT upper limits to GRB071028
  40. GRB071028: Xinglong EST V-band upper limit
  41. GRB 071028: Swift-XRT Team refined analysis
  42. GRB 071028, Swift-BAT refined analysis
  43. GRB 071028: Swift detection of a burst
  44. GRB 071025: Kuiper Telescope Optical Observations
  45. GRB 071018: Revised BAT position
  46. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  47. GRB071021: MARGE Optical Limits
  48. GRB071020, optical upper limit
  49. GRB 071025 Milagro GeV/TeV Observations
  50. Swift UVOT upper limits
  51. GRB071025: Xinglong TNT I-band upper limit
  52. GRB 071025: Swift-XRT Team refined analysis
  53. GRB 071025, Swift-BAT refined analysis
  54. GRB 071025: Early Super-LOTIS Observations
  55. GRB 071025: ROTSE-III Refined Analysis
  56. GRB 071025: Swift XRT refined position
  57. GRB071025: REM NIR afterglow
  58. GRB 071025: ROTSE-III Detection of Optical Counterpart
  59. GRB 071025: Swift detection of a burst
  60. GRB 071020: BTA spectroscopy
  61. Possible radio detection of GRB 071021 with the VLA
  62. Radio detection of GRB 071020 with the VLA
  63. GRB 071021: Subaru NIR observation
  64. GRB071021: MITSuME Okayama Optical Upper Limits
  65. GRB 071021: Magellan i-band observation
  66. GRB 071021: Magellan R-band observation
  67. GRB 071021: optical and NIR observations
  68. GRB 071021, Swift-BAT refined analysis
  69. GRB071018: 2nd epoch obsevations of Xinglong TNT
  70. GRB 071021: Swift-XRT Team refined analysis
  71. GRB 071021: Xinglong TNT optical Upper Limit
  72. GRB 071021 : Lulin R-band limit
  73. Konus-Wind observation of GRB 071020
  74. GRB 071021: Faulkes Telescope South optical candidate
  75. GRB 071021: Swift detection of a burst
  76. GRB 071020: Swift-XRT refined analysis
  77. GRB 071020, Swift-BAT refined analysis
  78. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  79. GRB071020 - SDSS Pre-burst Observations
  80. GRB 071020: Swift detection of a bright burst
  81. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  82. GRB 071018: Mercator Telescope optical observations
  83. Swift autonomous slewing re-enabled
  84. GRB 071018: SARA observations
  85. GRB 071018: Swift-XRT observation
  86. GRB 071017 - Swift XRT observations
  87. VLA radio observation of GRB 071018
  88. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  89. GRB 071018, Swift-BAT refined analysis
  90. GRB 071018?: Swift detection of a possible burst
  91. GRB 071010B: Suzaku WAM observation of the prompt emission
  92. GRB 071013: 3rd TLS Epoch - constraints on variability
  93. GRB 071013: TLS Upper Limit
  94. VLA detection of radio afterglow of GRB 071010B
  95. VLA non-detection of GRB 071011
  96. GRB 071013: Optical observations
  97. GRB 071013, Swift-BAT refined analysis
  98. GRB 071013: Swift detection of a burst
  99. GRB 071010C Swift-BAT detection of a burst
  100. GRB 071011: Swift-XRT refined analysis

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