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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"

12057 results found.

  1. GRB 061028: TAROT Calern observatory late optical observations
  2. GRB 061028: Swift detection of a burst
  3. GRB 061027, Swift refined analysis of a possible burst
  4. GRB 061027: Swift detection of a possible burst
  5. GRB061025: Swift/UVOT observations
  6. GRB 061019: MITSuME upper limits
  7. Konus-Wind observation of GRB 061021
  8. GRB 061021 - VLT spectrum without lines
  9. GRB 061019: Super-LOTIS upper limit
  10. GRB 061019: SARA upper limit
  11. GRB 061019: Swift/UVOT upper limit
  12. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  13. GRB 061006: Swift/UVOT optical observations
  14. GRB 061006: Swift detection of a burst
  15. GRB061004: Swift/UVOT optical observations
  16. GRB 061004: Swift detection of a burst
  17. GRB061002: Swift UVOT followup observations
  18. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  19. GRB 061002: Swift detection of a burst
  20. GRB 060923A: Probable host galaxy in the R-band
  21. GRB 060929: Swift/UVOT Optical Observations
  22. GRB060923C: optical limit
  23. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  24. GRB 060927: Swift/UVOT Optical Observations
  25. GRB 060927 optical limit
  26. GRB 060927, optical observation
  27. GRB 060926: Swift-UVOT Detections
  28. GRB 060923C: VLA Observation
  29. GRB 060923C, optical observation
  30. GRB060923B: Swift/UVOT upper limits
  31. GRB 060923A: Keck and Gemini Observations
  32. GRB060919: Swift/UVOT optical observations
  33. GRB 060912A: VLA Observation
  34. GRB060825: MAGIC telescope GeV observation
  35. GRB060912: Swift/UVOT Observations
  36. GRB060906: Danish/DFOSC optical observations
  37. VLA observations of GRB 060908
  38. GRB 060906: Swift-UVOT observations
  39. GRB 060906: Swift detection of a probable burst
  40. GRB 060904A Milagro GeV/TeV Observations
  41. GRB060904A: Swift/UVOT optical observations
  42. GRB 060904: Swift detection of a bright burst
  43. 060901: Swift UVOT followup observations
  44. GRB 060604: VLA Observation
  45. GRB 060605: VLA Observation
  46. GRB 060707: VLA observation
  47. GRB 060825: VLA observations
  48. GRB 060825: Swift detection of a burst
  49. GRB060814: Swift/UVOT upper limits
  50. GRB 060814: Swift detection of a bright burst
  51. GRB060813: Swift/UVOT upper limits
  52. GRB 060813: Swift detection of a burst
  53. Second VLA limit on new radio point source in SGR 1806-20
  54. A dust-scattering halo detected around SGR 1806-20
  55. GRB 060729: An update on the Swift XRT and UVOT observations
  56. VLA Upper Limit on Outburst of SGR 1806-20
  57. GRB 060807: UVOT Upper limits
  58. GRB060807: optical upper limit in white light
  59. GRB 060805B: Swift/UVOT Upper Limits
  60. GRB 060807: optical limit
  61. GRB 060807: Swift detection of a burst
  62. GRB 060805: optical upper limit in R
  63. GRB 060805: Swift/UVOT Upper Limits
  64. GRB 060804: Swift UVOT observations
  65. GRB 060728: Upper limits of the X-ray emission
  66. GRB060801: Swift/UVOT Upper Limits
  67. GRB060801: optical upper limit in R
  68. GRB 060801, optical observation
  69. GRB 060801: Swift detection of a short burst
  70. GRB 060719: TORTOREM optical upper limits
  71. GRB 060728: Swift/UVOT Upper Limits
  72. GRB060719: prompt NIR observations with REM
  73. GRB 060522: VLA observation
  74. GRB 060719: Swift/UVOT Upper Limits
  75. GRB 060719: Swift detection of a burst
  76. GRB 060717: NOT observations
  77. GRB 060717 optical upper limit
  78. GRB060717: Swift/UVOT upper limits
  79. GRB 060708: VLT spectroscopy
  80. GRB 060712: Swift/UVOT Upper Limits
  81. GRB060526: optical observations
  82. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  83. GRB 060707: Swift detection of a burst
  84. GRB 060515: Upper Limit on Host Galaxy
  85. GRB 060109: Upper Limit on Host Galaxy
  86. GRB 060105: Upper limit on Host Galaxy
  87. Konus-Wind observation of GRB 060614
  88. GRB 070706B: Watcher upper limit
  89. GRB060602A: Swift/UVOT upper limits
  90. GRB060605: Swift/UVOT detections
  91. GRB060604: Swift/UVOT detections
  92. GRB 060604: Swift-XRT Team refined analysis
  93. GRB 060602A: Swift-BAT Refined Analysis: Correction
  94. GRB 060602B: Swift/UVOT observations
  95. GRB 060602B: Swift detection of a burst
  96. GRB060526: optical observations
  97. GRB 060526: REM observations
  98. GRB060526: Further Swift-UVOT Observations
  99. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  100. GRB 060522: REM NIR observations

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