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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

8489 results found.

  1. GRB 061201: Swift detection of a short hard burst
  2. GRB 061121: Second Epoch ATCA Radio Observations
  3. GRB 061121: ATCA & WSRT Radio Observations
  4. GRB 061126: Swift/UVOT Afterglow Detection
  5. GRB 061122: Candidate Optical Afterglow
  6. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  7. GRB 061121: Swift detection of a bright burst with an optical counterpart
  8. GRB 061110B: Swift/XRT position
  9. GRB 061110B: Swift-UVOT Initial Observation
  10. GRB 061110A, Swift-BAT refined analysis
  11. GRB 061110: Candidate confirmed
  12. GRB 061110 : Optical afterglow candidate
  13. GRB 061110: Swift detection of a burst
  14. GRB 061027: TAROT La Silla observatory optical observations
  15. GRB 061007: Third Epoch ATCA Radio Observations
  16. GRB 061004: Further VLT/NTT observations
  17. GRB 061028: Optical R passband observations
  18. GRB 061102: Swift detection of a burst
  19. GRB 061028: Futher P200 Observations
  20. GRB 061028: P200 Observations
  21. GRB 061028: Swift detection of a burst
  22. GRB 061027, Swift refined analysis of a possible burst
  23. GRB 061027: Swift detection of a possible burst
  24. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  25. GRB 061025: REM observations
  26. GRB 061025: Gemini-S observations
  27. GRB 061021, Swift-BAT refined analysis
  28. GRB 061021: Swift detection of a burst
  29. GRB 061019: SARA upper limit
  30. GRB061019: Swift XRT refined analysis
  31. GRB 061019: REM K-band candidate afterglow
  32. GRB 061007: Second Epoch ATCA Radio Observations
  33. GRB 061006: astrometry-corrected XRT position
  34. GRB 061007: ATCA Radio Observations
  35. GRB 061007: ROTSE-III Detection of Optical Counterpart
  36. GRB 060930: near-IR afterglow candidate retraction
  37. GRB 061004: Optical afterglow candidate and redshift
  38. GRB 061004: Swift detection of a burst
  39. GRB 060930: near-IR afterglow candidate
  40. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  41. GRB 061002: Swift detection of a burst
  42. GRB 060929: Swift detection of a burst
  43. GRB 060927: Swift XRT Team refined analysis
  44. GRB060927: Faulkes Telescope South observation
  45. GRB 060927: Swift detection of a burst
  46. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  47. GRB 060926: MASTER optical observation
  48. GRB 060926: Swift detection of a burst
  49. GRB 060923C: Gemini Observations and Afterglow Candidate
  50. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  51. GRB 060923A: Swift XRT refined analysis
  52. GRB 060923C: Keck Observations
  53. GRB 060923A: Keck and Gemini Observations
  54. GRB 060923C: optical observation
  55. GRB 060923B: Swift detection of a burst
  56. GRB 060923: UKIRT nIR observations - candidate afterglow
  57. GRB 060923: Swift detection of a burst
  58. GRB 060919, Swift-BAT refined analysis
  59. GRB 060919: Swift detection of a burst
  60. GRB060912: optical observations
  61. GRB 060912: Swift detection of a burst with an optical afterglow
  62. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  63. GRB 060908: Swift detection of a burst with a bright optical counterpart
  64. GRB 060906: KAIT observations
  65. GRB 060906: Confirmation of P60 Optical Afterglow
  66. GRB 060906: observations with FRAM
  67. GRB 060906 (?): P60 Optical Afterglow Candidate
  68. GRB 060906: Swift detection of a probable burst
  69. GRB 060904B: Swift detection of a burst with optical counterpart
  70. GRB 060904: Swift detection of a bright burst
  71. GRB 060826(?): Swift detection of a possible burst
  72. GRB 060825: TAROT optical observations
  73. GRB 060825: Swift detection of a burst
  74. GRB060801: host galaxy redshift
  75. GRB 060814: Swift detection of a bright burst
  76. GRB 060813: Swift detection of a burst
  77. GRB060807: Possible Highly Significant X-ray Emission Lines
  78. GRB 060805B: XRT Team Analysis
  79. GRB 060807: K- and R-band observations
  80. GRB060807: optical afterglow candidate
  81. GRB060807: optical upper limit in white light
  82. GRB 060805B: Swift/UVOT Upper Limits
  83. GRB 060807: Swift detection of a burst
  84. GRB 060805: optical upper limit in R
  85. GRB 060805: Swift/UVOT Upper Limits
  86. GRB 060805: Swift detection of a burst
  87. GRB 060804: Swift UVOT observations
  88. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  89. GRB 060728: Upper limits of the X-ray emission
  90. GRB 051109B: Bright spiral host galaxy at low redshift
  91. GRB060801: optical upper limit in R
  92. GRB 060801: Swift detection of a short burst
  93. GRB 060729: Swift-XRT refined analysis
  94. GRB060719: prompt NIR observations with REM
  95. GRB 060719: Refined analysis of the Swift-BAT burst
  96. GRB 060719: prompt PROMPT observations
  97. GRB 060719: Continued LCO optical observations
  98. GRB 060719: Swift detection of a burst
  99. GRB 060717 optical upper limit
  100. GRB 060714: REM infrared observations

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