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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"

43899 results found.

  1. GRB 061222b, SMARTS optical/IR afterglow observations
  2. GRB 061222B: TAROT La Silla observatory afterglow observation
  3. GRB 061222B: TAROT La Silla observatory optical observations
  4. GRB 061222b: Magellan redshift
  5. GRB 061222B: Swift detection of a burst
  6. GRB 061222b: optical afterglow
  7. GRB 061222A: Prompt ROTSE-III Optical Limits
  8. GRB 061222: Swift detection of a burst
  9. GRB 061217: Astrometry-Corrected XRT Position
  10. GRB 061201: Magellan redshift of nearby galaxy
  11. GRB 061217: Confirmation of host candidate
  12. GRB 061217: Object ib GCN 5948 is a star
  13. GRB 061217: Extended object in the revised XRT error circle
  14. GRB 061217, Candidate host galaxy
  15. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  16. GRB 061201: Correction to GCN 5944
  17. GRB 061201: Magellan Redshift of nearby Abell cluster
  18. GRB 061218: TAROT La Silla observatory optical observations
  19. GRB 061217: TAROT Calern observatory optical observations
  20. GRB 061218: TORTOREM optical upper limits
  21. GRB 061218, Swift-BAT refined analysis
  22. GRB061217: VLT NIR observations
  23. GRB 061218, SMARTS optical/IR observations
  24. GRB 061218: REM prompt observations
  25. Swift triggers (#251863) on a possible burst
  26. GRB 061217, SMARTS optical observations
  27. GRB061217: Swift/UVOT refined analysis.
  28. GRB 061217: optical observations at Calar Alto
  29. GRB061217 - Swift/XRT refined analysis
  30. GRB 061217, Swift-BAT refined analysis
  31. GRB 061217: Magellan Observations
  32. GRB 061217: REM prompt observations
  33. GRB 061217: ROTSE-III Optical Limits
  34. GRB 061217: Swift detection of a short hard burst
  35. GRB 061210: MDM Follow-up Observation
  36. GRB061210: Swift/UVOT observations
  37. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  38. GRB 061210: Optical sources near XRT positions
  39. GRB 061210: Swift XRT analysis - Possible counterparts
  40. GRB 061210 : Faulkes North Telescope optical limit
  41. GRB 061214(?): ROTSE-III Optical Limits
  42. GRB 061214(?): Swift detection of a possible burst
  43. GRB 061210: Suzaku WAM observation of the prompt emission
  44. Swift/BAT trigger #250033 is due to a known source during loss of
  45. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  46. GRB 061213: MASTER-VWF-Kislovodsk observations
  47. GRB 061210: Gemini/GMOS Observations
  48. GRB 061126: Radio Observations
  49. GRB061210: Radio Observations
  50. GRB061201, VLT optical decay: correction
  51. GRB 061126: a GRB detected off-axis by INTEGRAL
  52. GRB 061202: Suzaku WAM observation of the prompt emission
  53. GRB 061210: MDM Observation
  54. GRB 061210, Swift-BAT refined analysis of the SHB
  55. GRB 061210: Swift-BAT detection of a short burst
  56. Optical Afterglow observations of GRB 061126
  57. GRB061126: optical observations
  58. GRB 060926: MASTER: discovery of the optical flare
  59. GRB061126: update on the Swift-XRT afterglow light curve
  60. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  61. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  62. GRB 061202: TORTOREM optical upper limits
  63. GRB 061201: VLT optical decay
  64. GRB 061201: SOAR Confirmation of Candidate Afterglow
  65. GRB061126 : NMSU 1.0m observations
  66. GRB 061202: Swift XRT refined analysis
  67. Konus-Wind observation of GRB 061201
  68. GRB061202: optical/NIR observations with REM
  69. GRB 061202, Swift-BAT refined analysis
  70. GRB 061202: Swift detection of a burst
  71. GRB 061201: Swift XRT Team refined analysis
  72. GRB 061201: VLT optical observations
  73. GRB 061201: Initial UVOT Observations
  74. GRB 061201, Swift-BAT refined analysis of the SHB
  75. GRB 061201: Swift detection of a short hard burst
  76. GRB 061201: Coincidence with a Galaxy Cluster
  77. GRB 061121, SMARTS optical/IR observations
  78. GRB 061121: flattening of the decay
  79. INT+WFC observations of GRB 061126
  80. GRB 061126: Possible Jet Break
  81. GRB 061121: Second Epoch ATCA Radio Observations
  82. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  83. Swift XRT on-board boresight update
  84. GRB 061121: ATCA & WSRT Radio Observations
  85. GRB061121: optical observations
  86. GRB 061126: Early Super-LOTIS Observations
  87. RHESSI Spectrum of GRB061126
  88. GRB 061126: Tautenburg afterglow observations
  89. GRB061126: Optical afterglow observations from MIRO
  90. GRB061126: Optical afterglow observations from MIRO
  91. GRB 061126 : SDSS Pre-Burst Observations
  92. GRB 061126: Swift-XRT refined analysis
  93. GRB 061126: Swift/UVOT Observations
  94. GRB 061126, Swift-BAT refined analysis
  95. GRB 061126: SARA Observations
  96. GRB 061126: Early Detection of the IR Afterglow
  97. GRB 061126: Faulkes Telescope North Optical Observations
  98. GRB 061126: Swift/UVOT Afterglow Detection
  99. GRB 061126: XRT position
  100. GRB 061126: Swift detection of a burst

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