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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"

32702 results found.

  1. GRB 070103: NOT observations
  2. Retractions of previous Swift-BAT triggers
  3. GRB061222a: optical observations
  4. Konus-Wind observation of GRB 061222A
  5. GRB 061210: Swift/XRT Astrometry Correction
  6. GRB 050826: MDM Redshift
  7. GRB 061222B: TAROT La Silla observatory early optical observations
  8. GRB 061218: TAROT La Silla observatory early optical observations
  9. GRB 061222A: MITSuME Akeno optical upper limits
  10. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  11. GRB 061222B: MITSuME Akeno optical upper limits
  12. GRB 061222A: Gemini Afterglow Candidate
  13. GRB 061222B, Swift-BAT refined analysis
  14. GRB061222A Swift/UVOT: Upper Limits
  15. GRB 061222B: Swift/UVOT Upper limits
  16. GRB 061222B: Observation with the KANATA 1.5m telescope
  17. GRB061222B: Swift-XRT Refined Analysis
  18. GRB 061222A: Observation with the KANATA 1.5m telescope
  19. GRB 061222B: BOOTES-IR optical observations
  20. GRB 061222B: SARA upper limit
  21. GRB 061222A: Swift-XRT refined analysis
  22. GRB 061217: Magellan host galaxy redshift
  23. GRB 061222A, Swift-BAT refined analysis
  24. GRB 061222B: REM NIR/optical observations
  25. GRB 061222b, SMARTS optical/IR afterglow observations
  26. GRB 061222B: TAROT La Silla observatory afterglow observation
  27. GRB 061222b: Magellan redshift
  28. GRB 061222B: Swift detection of a burst
  29. GRB 061222A: Prompt ROTSE-III Optical Limits
  30. GRB 061201: Magellan redshift of nearby galaxy
  31. GRB 061217: Confirmation of host candidate
  32. GRB 061217: Object ib GCN 5948 is a star
  33. GRB 061217: Extended object in the revised XRT error circle
  34. GRB 061217, Candidate host galaxy
  35. GRB 061217 - Swift/XRT position correction
  36. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  37. GRB 061201: Correction to GCN 5944
  38. GRB 061201: Magellan Redshift of nearby Abell cluster
  39. GRB 061218: TAROT La Silla observatory optical observations
  40. GRB 061217: TAROT Calern observatory optical observations
  41. GRB 061218: TORTOREM optical upper limits
  42. GRB 061218, Swift-BAT refined analysis
  43. GRB061217: VLT NIR observations
  44. GRB 061218, SMARTS optical/IR observations
  45. GRB 061218: REM prompt observations
  46. GRB 061217, SMARTS optical observations
  47. GRB061217: Swift/UVOT refined analysis.
  48. GRB 061217: optical observations at Calar Alto
  49. GRB061217 - Swift/XRT refined analysis
  50. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  51. GRB 061217, Swift-BAT refined analysis
  52. GRB 061217: Magellan Observations
  53. GRB 061217: REM prompt observations
  54. GRB 061217: ROTSE-III Optical Limits
  55. GRB 061210: MDM Follow-up Observation
  56. GRB061210: Swift/UVOT observations
  57. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  58. GRB 061210: Optical sources near XRT positions
  59. GRB 061210: Swift XRT analysis - Possible counterparts
  60. GRB 061210 : Faulkes North Telescope optical limit
  61. GRB 061214(?): ROTSE-III Optical Limits
  62. GRB 061210: Suzaku WAM observation of the prompt emission
  63. Swift/BAT trigger #250033 is due to a known source during loss of
  64. GRB 061213: MASTER-VWF-Kislovodsk OT candidate retraction
  65. GRB 061210: Gemini/GMOS Observations
  66. GRB 061126: Radio Observations
  67. GRB061210: Radio Observations
  68. GRB061201, VLT optical decay: correction
  69. GRB 061126: a GRB detected off-axis by INTEGRAL
  70. GRB 061202: Suzaku WAM observation of the prompt emission
  71. GRB 061210: MDM Observation
  72. GRB 061210, Swift-BAT refined analysis of the SHB
  73. GRB 061210: Swift-BAT detection of a short burst
  74. Optical Afterglow observations of GRB 061126
  75. GRB061126: optical observations
  76. GRB 060926: MASTER: discovery of the optical flare
  77. GRB061126: update on the Swift-XRT afterglow light curve
  78. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  79. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  80. GRB 061202: TORTOREM optical upper limits
  81. GRB 061201: VLT optical decay
  82. GRB 061201: SOAR Confirmation of Candidate Afterglow
  83. GRB061126 : NMSU 1.0m observations
  84. GRB 061202: Swift XRT refined analysis
  85. GRB061202: FRAM early follow-up limit
  86. Konus-Wind observation of GRB 061201
  87. GRB061202: optical/NIR observations with REM
  88. GRB061202: Swift/UVOT Upper Limits
  89. GRB 061202, Swift-BAT refined analysis
  90. GRB 061201: Swift XRT Team refined analysis
  91. GRB 061201: VLT optical observations
  92. GRB 061201: Initial UVOT Observations
  93. GRB 061201, Swift-BAT refined analysis of the SHB
  94. GRB 061122: GETS observation
  95. GRB 061121, SMARTS optical/IR observations
  96. GRB 061121: flattening of the decay
  97. INT+WFC observations of GRB 061126
  98. GRB 061126: Possible Jet Break
  99. GRB 061121: Second Epoch ATCA Radio Observations
  100. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission

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