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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"

21966 results found.

  1. GRB 061218: REM prompt observations
  2. GRB 061217, SMARTS optical observations
  3. GRB061217: Swift/UVOT refined analysis.
  4. GRB 061217: optical observations at Calar Alto
  5. GRB 061217: Magellan Observations
  6. GRB 061217: REM prompt observations
  7. GRB 061210: MDM Follow-up Observation
  8. GRB061210: Swift/UVOT observations
  9. GRB 061210: Optical sources near XRT positions
  10. GRB 061210 : Faulkes North Telescope optical limit
  11. GRB 061213: MASTER-VWF-Kislovodsk observations
  12. GRB 061210: Gemini/GMOS Observations
  13. GRB 061126: Radio Observations
  14. GRB061210: Radio Observations
  15. GRB061201, VLT optical decay: correction
  16. GRB 061210: Swift-BAT detection of a short burst
  17. Optical Afterglow observations of GRB 061126
  18. GRB061126: optical observations
  19. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  20. GRB 061201: VLT optical decay
  21. GRB061126 : NMSU 1.0m observations
  22. GRB061202: optical/NIR observations with REM
  23. GRB 061201: VLT optical observations
  24. GRB 061201: Initial UVOT Observations
  25. GRB 061201: Coincidence with a Galaxy Cluster
  26. GRB 061121, SMARTS optical/IR observations
  27. GRB 061121: flattening of the decay
  28. INT+WFC observations of GRB 061126
  29. GRB 061126: Possible Jet Break
  30. GRB 061121: Second Epoch ATCA Radio Observations
  31. GRB 061121: ATCA & WSRT Radio Observations
  32. GRB061121: optical observations
  33. GRB 061126: Early Super-LOTIS Observations
  34. GRB 061126: Tautenburg afterglow observations
  35. GRB061126: Optical afterglow observations from MIRO
  36. GRB061126: Optical afterglow observations from MIRO
  37. GRB 061126 : SDSS Pre-Burst Observations
  38. GRB 061126: Swift/UVOT Observations
  39. GRB 061126: SARA Observations
  40. GRB 061126: Faulkes Telescope North Optical Observations
  41. GRB 061126: Swift detection of a burst
  42. GRB 061121: MDM Continued Monitoring
  43. GRB 061122: Confirmation of X-ray/Optical Afterglow
  44. GRB 061121: MDM Continuing Optical Decay
  45. GRB061121: optical observations
  46. GRB 061122: Candidate Optical Afterglow
  47. GRB061122: Swift/UVOT Optical Observations
  48. GRB061121: P60 Observations
  49. Radio detection of GRB 061121
  50. GRB 061121: MDM Optical Observations
  51. GRB 061121 declared "Burst of Interest" by Swift team
  52. Konus-Wind and Konus-A observations of GRB 061121
  53. GRB 061121: Swift/UVOT Observations
  54. GRB 061121: Optical observation at the KANATA 1.5m telescope
  55. GRB 061121: Faulkes Telescope North Optical Observation
  56. GRB061121: Keck spectroscopic observations
  57. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  58. GRB 060605: NIR Observations
  59. GRB 050915B: optical afterglow
  60. GRB 061110B: NIR Observations
  61. Swift TOO observations of GRB061110A
  62. GRB 061110A - VLT tentative redshift
  63. GRB 061110B: VLT redshift
  64. GRB061110B: Optical observations at Crni Vrh
  65. GRB 061110B: NOT optical observations
  66. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  67. GRB 061110B: TAROT Calern observatory optical observations
  68. GRB 061110: NOT observations
  69. GRB 061110 : Optical afterglow candidate
  70. GRB 061109: TAROT Calern observatory optical observations
  71. GRB 061027: TAROT La Silla observatory optical observations
  72. GRB 061007: Third Epoch ATCA Radio Observations
  73. GRB061019: second epoch CrAO observations
  74. GRB 061004: Further VLT/NTT observations
  75. GRB061102B: Super-LOTIS observations
  76. GRB 061028: Optical R passband observations
  77. GRB 060801: Swift/XRT Astrometry Correction
  78. GRB 061028: Futher P200 Observations
  79. GRB 061028: MDM Observations
  80. GRB 061028: P200 Observations
  81. GRB 061028: SARA upper limit
  82. GRB 061028: Swift/UVOT Observations
  83. GRB 061028: TAROT Calern observatory late optical observations
  84. GRB 061028: TAROT Calern observatory optical observations
  85. GRB061025: Swift/UVOT observations
  86. GRB 061025: REM observations
  87. GRB 061025: Gemini-S observations
  88. GRB061025: Swift XRT position
  89. GRB 061025: ROTSE-III Optical Limits
  90. GRB 061021 - VLT spectrum without lines
  91. GRB 061021: Swift/UVOT Observation
  92. GRB 061019: Super-LOTIS upper limit
  93. GRB060904b: optical observations
  94. GRB061019: optical observations
  95. GRB061019: optical observations
  96. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  97. GRB 061019: SMARTS afterglow confirmation
  98. GRB 061019: TAROT La Silla observatory optical observations
  99. GRB 061019: REM K-band candidate afterglow
  100. GRB061019: Swift/XRT position

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