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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"

15685 results found.

  1. GRB060707 possible optical confirmation
  2. GRB 060714, optical observation
  3. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  4. GRB 060605: SkyNet Optical Limits
  5. GRB060526: optical observations
  6. GRB060712: MASTER optical observation
  7. GRB120706: MASTER optical observation
  8. GRB 060708: PROMPT Optical Limits
  9. GRB 060707: OA fading and redshift
  10. GCN 060708: Swift-UVOT Observations
  11. GCN 060707: Swift-UVOT observations
  12. GRB 060707: Swift-XRT refined analysis
  13. GRB060707 possible optical confirmation
  14. GRB 060707: BOOTES-IR optical afterglow candidate
  15. GRB 060707: BOOTES-IR optical observation
  16. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  17. GRB060614: Detection of the host galaxy but no supernova emission
  18. GRB060614: Optical observations
  19. GRB060512: near IR observations
  20. GRB060526: optical observations
  21. GRB060605: optical observation
  22. The Unusually Long-Lived Afterglow of GRB 060614
  23. GRB 060614: optical observations
  24. GRB 060605, optical observations
  25. GRB 060614, SMARTS optical/IR afterglow observation
  26. GRB 060614: Swift/UVOT Observations
  27. GRB 060604, optical observations
  28. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  29. GRB 060607: RTT150 optical observations
  30. GRB 070706B: Watcher upper limit
  31. GRB060602A: Swift/UVOT upper limits
  32. GCN 060607: Swift-UVOT obswervations.
  33. GRB 060607: optical limit by "Pi of the Sky"
  34. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  35. GRB 060607: PROMPT Observations
  36. GRB 060605: RTT150 optical observations
  37. GRB 060607: Swift detection of a burst with bright optical counterpart
  38. GRB 060522: PROMPT Optical Limits
  39. GRB 060605: Xinglong TNT optical observations
  40. GRB060605: Swift/UVOT detections
  41. GRB 060605: Swift-XRT Team refined analysis
  42. GRB 060605: TNG optical observations
  43. GRB 060605: RTT150 optical observations
  44. GRB 060605: ROTSE-III Optical Counterpart
  45. GRB 060605: Swift detection of a burst with optical counterpart
  46. GRB 060605: ROTSE-III Detection of Optical Counterpart
  47. GRB 060604: redshift
  48. GRB 060512: Keck Redshift
  49. GRB 060604 optical photometry
  50. GRB 060604A: ROTSE-III Optical Limits
  51. GRB 060604: Swift detection of a burst with possible optical counterpart
  52. GRB 060602B: RTT150 optical observations
  53. GRB 060211A : WIDGET simultaneous optical observations
  54. GRB060602A: optical observations(/transient?)
  55. GRB 060526: Tautenburg Second Epoch Observations
  56. GRB 060502A: Optical afterglow observations
  57. GRB 060526: Break in X-ray light curve
  58. GRB 060526: RTT150 optical observations
  59. GRB060526, optical observations
  60. GRB 051227 : WIDGET simultaneous optical observations
  61. GRB 051028 : WIDGET pre-trigger limit
  62. GRB 060526: RTT150 optical observations
  63. GRB 060526: Multiple Optical Flares
  64. GRB060526: afterglow fitting and probable jet break
  65. GRB 060526: RTT150 optical observations
  66. GRB060526: Optical counterpart from MIRO
  67. GRB060502b: optical observations
  68. GRB 060526: RTT150 optical observations
  69. GRB060526: optical observations
  70. GRB 060526: SMARTS optical/IR afterglow observations
  71. GRB060526: possible break in the optical light curve
  72. GRB 060526: REM observations
  73. GRB 060526: RTT150 optical observations, afterglow flattening
  74. GRB 060526: Optical Flare
  75. GRB 060526: RTT150 optical observations
  76. GRB060526: Further Swift-UVOT Observations
  77. GRB060526, optical observations
  78. GRB 060526: Magellan Redshift
  79. GRB 060526 Lulin optical observation
  80. GRB 060526: TNG optical observations
  81. GRB 060526: ROTSE-III Observations of Optical Counterpart
  82. GRB 060526: Continued emission for the Swift burst
  83. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  84. GRB060505: VLT observations of the optical afterglow
  85. GRB 060413 : WIDGET simultaneous optical observations
  86. GRB 060522: Swift/UVOT Observations: Correction
  87. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  88. XMM-Newton observation of GRB060510b
  89. GRB060512: Late-Time P200 Observations
  90. GRB 060522: Swift/XRT Team refined analysis
  91. GRB 060522: REM NIR observations
  92. GRB 060522: TNG optical observations
  93. GRB 060522: Swift detection of a burst with possible optical afterglow
  94. GRB 060512: reanalysis of optical spectra
  95. GRB 060210: Jet Break in the XRT light curve
  96. GRB 060512: TNG optical spectroscopy
  97. GRB 060512: TAROT optical observation
  98. GRB 060515: Swift/XRT Team refined analysis
  99. GRB 060515: Super-LOTIS Observations
  100. GRB 060515: TAROT optical observation

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