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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"

37250 results found.

  1. Konus-Wind observation of GRB 060105
  2. GRB 060105: ISAS observations and near IR upper limit
  3. GRB 060105: Swift/UVOT upper limits
  4. GRB 060105: Mitsume optical observations
  5. GRB 060105: BAT refined analysis
  6. GRB 060102 - no XRT afterglow
  7. GRB 060105: XRT refined analysis
  8. GRB060105: Suzaku-XIS and -HXD observation plan
  9. GRB060105, optical observation
  10. GRB060105 : Kiso optical observation
  11. GRB060105: Swift detection of a bright long burst
  12. Swift-BAT trigger 175653 is not an astrophysical source
  13. GRB 060102: MDM Observation
  14. Swift-BAT trigger 175653 is probably not a GRB
  15. GRB 060102: Swift-BAT refined analysis
  16. Time Correction to GRB 060102
  17. GRB 060102: Swift-BAT detection of a burst
  18. GRB051211B: optical observations
  19. GRB051227: SARA Observations
  20. GRB 051221B: Optical Observations with Kuiper 1.54m
  21. GRB 051227: Likely host galaxy underlying afterglow position
  22. GRB 051227: optical observation
  23. GRB 051221A: VLA Radio Observations
  24. GRB 051227: Confirmed fading from Gemini observations
  25. GRB051227: further analysis of VLT images
  26. GRB 051227: optical afterglow
  27. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  28. GRB 051227: Gemini observations
  29. GRB 051227: Keck Spectroscopy
  30. GRB 051227: Magellan r'-band Imaging/Astrometry
  31. GRB 051227: refined analysis of VLT images
  32. GRB 051227: P60 Observations
  33. GRB 051227: MDM Observation
  34. GRB 051227: R-band object in the XRT error circle
  35. GRB 051227: Joint Swift-HETE Spectral Analysis
  36. GRB 051227: XRT refined analysis
  37. GRB 051227: Further analysis of the Swift-BAT burst
  38. GRB 051227: Refined analysis of the Swift-BAT burst
  39. GRB051227: SDSS pre-burst observations
  40. GRB 051227, optical observation
  41. GRB 051227: Swift detection of a burst
  42. IBAS_alert n. 2719 : not a real GRB
  43. Konus-Wind observation of GRB 051221A
  44. GRB051221A: Suzaku WAM observation of the prompt emission
  45. GRB 051221A: MDM Optical Observations
  46. GRB051016: analysis of the XMM-Newton observation
  47. GRB 051221A: Detection at 251nm with Swift UVOT
  48. GRB 051221A: Chandra Afterglow Position
  49. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  50. GRB 051221B: ROTSE-III Optical Limits
  51. GRB 051221B: TAROT optical limits
  52. GRB 051221A: WSRT Radio Observations
  53. GRB 051221: Redshift from Gemini
  54. GRB 051221: Continued fading of optical afterglow
  55. GRB 051221B: Refined analysis of the Swift-BAT burst
  56. Possible GRB 051221B: MDM Optical Detection
  57. GRB 051221A: RAPTOR Fading Counterpart Constraint
  58. GRB 051221B: BOOTES optical observations.
  59. Possible GRB 051221B: Swift XRT position
  60. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  61. Swift-BAT detection of a possible burst
  62. GRB 051221: Discovery of fading optical afterglow
  63. GRB 051221: Swift XRT refined analysis
  64. GRB 051221: Swift/UVOT upper limits
  65. GRB 051221: Possible nearby cluster
  66. GRB 051221: No variability in Gemini data
  67. GRB 051221: Correction to GCN #4368
  68. GRB 051221: Gemini observations
  69. GRB 051221: Improved astrometry of the IR counterpart
  70. GRB051221: K-band source
  71. GRB 051221: XRT position
  72. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  73. GRB 051221: IR Observations at GRB+1hr
  74. GRB 051221: Swift detection of a bright short burst
  75. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  76. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  77. GRB 051211B: optical afterglow
  78. Swift detection of an RS CVn flare star
  79. GRB051211A: possible optical candidate
  80. Swift Trigger 172767 is not a GRB
  81. GRB 051215: near-infrared observations
  82. GRB051215 - SDSS pre-burst observations
  83. GRB 051215: Swift detection of a possible burst
  84. GRB 051215: A short GRB in a cluster?
  85. GRB051211B: Probable radio afterglow
  86. GRB051105: optical observations
  87. GRB 051213: Swift-BAT refined analysis
  88. GRB 051211B, optical observation
  89. GRB 051213: Swift-BAT detection of a burst
  90. GRB 051211a: RTT150 optical observations
  91. GRB051211B, RBO optical observations
  92. GRB 051211A: Swift/UVOT upper limits
  93. GRB 051211B: Swift/UVOT upper limits - correction
  94. GRB 051211B: Swift/UVOT upper limits
  95. GRB 051211A,optical observation
  96. GRB 051211B: Swift XRT confirmation of the afterglow
  97. GRB051211B: Liverpool Telescope observation
  98. GRB 051211b: RTT150 optical observations
  99. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  100. GRB 051211B: Swift XRT Observations

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