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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"

19643 results found.

  1. GRB 070107: Swift/XRT position
  2. GRB 070107: Swift detection of a burst
  3. GRB070103: APO SPIcam i' and z' limits
  4. GRB 070103: Swift/UVOT Upper limits
  5. GRB070103: Swift XRT refined analysis
  6. GRB 070103, Swift-BAT refined analysis
  7. GRB 070103: TAROT Calern observatory optical observations
  8. GRB 070103: Swift detection of a burst
  9. Retractions of previous Swift-BAT triggers
  10. Konus-Wind observation of GRB 061222A
  11. GRB 061210: Swift/XRT Astrometry Correction
  12. GRB 050826: MDM Redshift
  13. GRB 061222B, Swift-BAT refined analysis
  14. GRB061222A Swift/UVOT: Upper Limits
  15. GRB 061222B: Swift/UVOT Upper limits
  16. GRB061222B: Swift-XRT Refined Analysis
  17. GRB 061222B: BOOTES-IR optical observations
  18. GRB 061222B: SARA upper limit
  19. GRB 061222A: Swift-XRT refined analysis
  20. GRB 061222A, Swift-BAT refined analysis
  21. GRB 061222B: TAROT La Silla observatory optical observations
  22. GRB 061222B: Swift detection of a burst
  23. GRB 061222A: Prompt ROTSE-III Optical Limits
  24. GRB 061222: Swift detection of a burst
  25. GRB 061217: Astrometry-Corrected XRT Position
  26. GRB 061217, Candidate host galaxy
  27. GRB 061217 - Swift/XRT position correction
  28. GRB 061218: TAROT La Silla observatory optical observations
  29. GRB 061217: TAROT Calern observatory optical observations
  30. GRB 061218, Swift-BAT refined analysis
  31. Swift triggers (#251863) on a possible burst
  32. GRB061217: Swift/UVOT refined analysis.
  33. GRB 061217: optical observations at Calar Alto
  34. GRB061217 - Swift/XRT refined analysis
  35. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  36. GRB 061217, Swift-BAT refined analysis
  37. GRB 061217: ROTSE-III Optical Limits
  38. GRB 061217: Swift detection of a short hard burst
  39. GRB 061210: MDM Follow-up Observation
  40. GRB061210: Swift/UVOT observations
  41. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  42. GRB 061210: Swift XRT analysis - Possible counterparts
  43. GRB 061210 : Faulkes North Telescope optical limit
  44. GRB 061214(?): ROTSE-III Optical Limits
  45. GRB 061214(?): Swift detection of a possible burst
  46. Swift/BAT trigger #250033 is due to a known source during loss of
  47. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  48. GRB 061213: MASTER-VWF-Kislovodsk observations
  49. GRB 061210: MDM Observation
  50. GRB 061210, Swift-BAT refined analysis of the SHB
  51. GRB 061210: Swift-BAT detection of a short burst
  52. Optical Afterglow observations of GRB 061126
  53. GRB061126: update on the Swift-XRT afterglow light curve
  54. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  55. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  56. GRB061126 : NMSU 1.0m observations
  57. GRB 061202: Swift XRT refined analysis
  58. GRB061202: FRAM early follow-up limit
  59. GRB061202 optical limit by "Pi of the Sky"
  60. Konus-Wind observation of GRB 061201
  61. GRB061202: Swift/UVOT Upper Limits
  62. GRB 061202, Swift-BAT refined analysis
  63. GRB 061202: Swift detection of a burst
  64. GRB 061201: Swift XRT Team refined analysis
  65. GRB 061201: Initial UVOT Observations
  66. GRB 061201, Swift-BAT refined analysis of the SHB
  67. GRB 061201: Swift detection of a short hard burst
  68. GRB 061201: Coincidence with a Galaxy Cluster
  69. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  70. Swift XRT on-board boresight update
  71. GRB 061126: Early Super-LOTIS Observations
  72. GRB061126: Optical afterglow observations from MIRO
  73. GRB061126: Optical afterglow observations from MIRO
  74. GRB 061126: Swift-XRT refined analysis
  75. GRB 061126: Swift/UVOT Observations
  76. GRB 061126, Swift-BAT refined analysis
  77. GRB 061126: Faulkes Telescope North Optical Observations
  78. GRB 061126: Swift/UVOT Afterglow Detection
  79. GRB 061126: XRT position
  80. GRB 061126: Swift detection of a burst
  81. GRB 061122: Confirmation of X-ray/Optical Afterglow
  82. GRB 061122: Candidate Optical Afterglow
  83. GRB 061121: Ep,i - Eiso correlation
  84. GRB061122: Swift/UVOT Optical Observations
  85. GRB061122: Swift-XRT position
  86. GRB 061121 declared "Burst of Interest" by Swift team
  87. Konus-Wind and Konus-A observations of GRB 061121
  88. Swift-BAT trigger 239987 is not a GRB
  89. GRB 061121: Swift/UVOT Observations
  90. GRB 061121: Swift-XRT Team Refined Analysis
  91. GRB 061121, Swift-BAT refined analysis
  92. GRB061121, optical observation
  93. GRB 061121: Faulkes Telescope North Optical Observation
  94. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  95. GRB 061121: Swift detection of a bright burst with an optical counterpart
  96. GRB 060111B: Swift UVOT Refined Magnitudes
  97. Swift-BAT triggers 238544 and 238546 are not GRBs
  98. Swift TOO observations of GRB061110A
  99. Swift/UVOT Upper Limits for GRB061110b
  100. Swift/UVOT Upper Limits for GRB061110a

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