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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"

41675 results found.

  1. GRB061110A - Optical Non-detection
  2. GRB 061109: optical observation
  3. GRB 061109: TAROT Calern observatory optical observations
  4. GRB 061109: Swift detection of a possible burst
  5. GRB061028: MAGIC telescope GeV observation
  6. GRB 061027: TAROT La Silla observatory optical observations
  7. GRB 061007: Third Epoch ATCA Radio Observations
  8. GRB061019: second epoch CrAO observations
  9. GRB 061028: Swift/XRT Astrometry Correction
  10. GRB 061102: Swift/UVOT Magnitude Upper Limits
  11. GRB 061102, XRT refined analysis
  12. GRB 061004: Further VLT/NTT observations
  13. GRB061102B: Super-LOTIS observations
  14. GRB 061102B: Swift detection of a possible burst
  15. GRB 061102, Swift-BAT refined analysis
  16. GRB 061102: Swift detection of a burst
  17. GRB 061028: VLA Observation
  18. GRB 061004: Swift/XRT Astrometry Correction
  19. GRB 060801: Swift/XRT Astrometry Correction
  20. GRB 061028: Futher P200 Observations
  21. GRB 061028: MDM Observations
  22. GRB 061028: P200 Observations
  23. GRB 061028: SARA upper limit
  24. GRB061028: XRT refined analysis
  25. GRB 061028, Swift-BAT refined analysis
  26. GRB 061028: TAROT Calern observatory optical observations
  27. GRB 061028: Swift detection of a burst
  28. GRB 061027, Swift refined analysis of a possible burst
  29. GRB 061027: Swift detection of a possible burst
  30. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  31. GRB061025: Swift XRT refined analysis
  32. GRB061025: Swift/UVOT observations
  33. GRB 061019: MITSuME upper limits
  34. GRB 061025: REM observations
  35. GRB061025: Swift XRT position
  36. GRB 061025: ROTSE-III Optical Limits
  37. GRB 061025: a long GRB detected by INTEGRAL
  38. Swift XRT boresight update
  39. GRB 061021, Swift-BAT Lag analysis
  40. Konus-Wind observation of GRB 061021
  41. GRB 061021 - VLT spectrum without lines
  42. GRB 061021: Swift-XRT refined analysis
  43. GRB 061021: Swift/UVOT Observation
  44. GRB 061021, Swift-BAT refined analysis
  45. GRB 061021: Swift detection of a burst
  46. GRB 061019: Super-LOTIS upper limit
  47. GRB060904b: optical observations
  48. GRB061019: optical observations
  49. GRB061019: optical observations
  50. GRB 061019: SARA upper limit
  51. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  52. GRB 061019: Swift/UVOT upper limit
  53. GRB 061019: SMARTS afterglow confirmation
  54. GRB061019: Swift XRT refined analysis
  55. GRB 061019, Swift-BAT refined analysis
  56. GRB 061019: TAROT La Silla observatory optical observations
  57. GRB 061019: REM K-band candidate afterglow
  58. GRB061019: Swift/XRT position
  59. GRB 061019: Swift-BAT detection of a burst
  60. GRB 060825: GORT Observations
  61. GRB 061007: Second Epoch ATCA Radio Observations
  62. GRB 061007: RHESSI Spectral Fit
  63. GRB 061007: Suzaku/WAM observation of the prompt emission
  64. GRB 061006: astrometry-corrected XRT position
  65. Konus-Wind observation of GRB 061007
  66. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  67. GRB 061007: ATCA Radio Observations
  68. GRB061007: Swift UVOT followup observations
  69. GRB 061006: optical afterglow
  70. GRB 061006 : Suzaku/WAM observation of the prompt emission
  71. GRB 061007: OA fading and VLT redshift
  72. GRB 061007: Magellan Spectroscopy
  73. GRB 061007: Correction to GCN 5712
  74. GRB 061007: Swift-BAT refined analysis
  75. GRB 061007: Swift XRT refined analysis
  76. GRB 061006: Swift/UVOT optical observations
  77. Konus-Wind observation of the short hard GRB 061006
  78. GRB 061007 - FTS early brightening and power law decay
  79. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  80. GRB 061007: Swift detection of a burst with an optical counterpart
  81. GRB 061006: VLT observation
  82. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  83. GRB 061006: Swift-XRT Team Refined Analysis
  84. GRB061006 (Swift 232585) might be a short-hard GRB
  85. GRB 060930: near-IR afterglow candidate retraction
  86. GRB061006: Faulkes Telescope South Observations
  87. GRB 061006: Swift detection of a burst
  88. GRB 061004: Optical afterglow candidate and redshift
  89. GRB 061004: Las Campanas Optical/NIR Observations
  90. GRB061004: Swift/UVOT optical observations
  91. GRB 061004: Swift-XRT Team Refined Analysis
  92. GRB 061004: Nearby 2MASS Galaxy
  93. GRB 061004: Swift detection of a burst
  94. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  95. Konus-Wind observation of GRB 060928
  96. GRB 060928: Suzaku/WAM observation of the prompt emission
  97. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  98. GRB 060928: Swift observations
  99. GRB 060928: RHESSI Spectral Fit
  100. IPN triangulation of GRB060928 (long, exceptionally bright)

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