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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"

36221 results found.

  1. GRB060108: SDSS pre-burst observations
  2. GRB060108: Faulkes Telescope observation
  3. GRB 060108: Refined analysis of the Swift-BAT burst
  4. GRB 060108: Swift XRT position
  5. GRB060108: Swift detection of its 100th GRB
  6. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  7. GRB 060105: Radio observations
  8. GRB 060105: MDM Observation
  9. Konus-Wind observation of GRB 060105
  10. GRB 060105: ISAS observations and near IR upper limit
  11. GRB 060105: Swift/UVOT upper limits
  12. GRB 060105: Mitsume optical observations
  13. GRB 060105: BAT refined analysis
  14. GRB 060102 - no XRT afterglow
  15. GRB 060105: XRT refined analysis
  16. GRB060105: Suzaku-XIS and -HXD observation plan
  17. GRB060105, optical observation
  18. GRB060105 : Kiso optical observation
  19. GRB060105: Swift detection of a bright long burst
  20. Swift-BAT trigger 175653 is not an astrophysical source
  21. GRB 060102: MDM Observation
  22. Swift-BAT trigger 175653 is probably not a GRB
  23. GRB 060102: Swift-BAT refined analysis
  24. Time Correction to GRB 060102
  25. GRB 060102: Swift-BAT detection of a burst
  26. GRB051211B: optical observations
  27. GRB051227: SARA Observations
  28. GRB 051221B: Optical Observations with Kuiper 1.54m
  29. GRB 051227: Likely host galaxy underlying afterglow position
  30. GRB 051227: optical observation
  31. GRB 051221A: VLA Radio Observations
  32. GRB 051227: Confirmed fading from Gemini observations
  33. GRB051227: further analysis of VLT images
  34. GRB 051227: optical afterglow
  35. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  36. GRB 051227: Gemini observations
  37. GRB 051227: Keck Spectroscopy
  38. GRB 051227: Magellan r'-band Imaging/Astrometry
  39. GRB 051227: refined analysis of VLT images
  40. GRB 051227: P60 Observations
  41. GRB 051227: MDM Observation
  42. GRB 051227: R-band object in the XRT error circle
  43. GRB 051227: Joint Swift-HETE Spectral Analysis
  44. GRB 051227: XRT refined analysis
  45. GRB 051227: Further analysis of the Swift-BAT burst
  46. GRB 051227: Refined analysis of the Swift-BAT burst
  47. GRB051227: SDSS pre-burst observations
  48. GRB 051227, optical observation
  49. GRB 051227: Swift detection of a burst
  50. IBAS_alert n. 2719 : not a real GRB
  51. Konus-Wind observation of GRB 051221A
  52. GRB051221A: Suzaku WAM observation of the prompt emission
  53. GRB 051221A: MDM Optical Observations
  54. GRB051016: analysis of the XMM-Newton observation
  55. GRB 051221A: Detection at 251nm with Swift UVOT
  56. GRB 051221A: Chandra Afterglow Position
  57. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  58. GRB 051221B: ROTSE-III Optical Limits
  59. GRB 051221B: TAROT optical limits
  60. GRB 051221A: WSRT Radio Observations
  61. GRB 051221: Redshift from Gemini
  62. GRB 051221: Continued fading of optical afterglow
  63. GRB 051221B: Refined analysis of the Swift-BAT burst
  64. Possible GRB 051221B: MDM Optical Detection
  65. GRB 051221A: RAPTOR Fading Counterpart Constraint
  66. GRB 051221B: BOOTES optical observations.
  67. Possible GRB 051221B: Swift XRT position
  68. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  69. Swift-BAT detection of a possible burst
  70. GRB 051221: Discovery of fading optical afterglow
  71. GRB 051221: Swift XRT refined analysis
  72. GRB 051221: Swift/UVOT upper limits
  73. GRB 051221: Possible nearby cluster
  74. GRB 051221: No variability in Gemini data
  75. GRB 051221: Correction to GCN #4368
  76. GRB 051221: Gemini observations
  77. GRB 051221: Improved astrometry of the IR counterpart
  78. GRB051221: K-band source
  79. GRB 051221: XRT position
  80. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  81. GRB 051221: IR Observations at GRB+1hr
  82. GRB 051221: Swift detection of a bright short burst
  83. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  84. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  85. GRB 051211B: optical afterglow
  86. Swift detection of an RS CVn flare star
  87. GRB051211A: possible optical candidate
  88. Swift Trigger 172767 is not a GRB
  89. GRB 051215: near-infrared observations
  90. GRB051215 - SDSS pre-burst observations
  91. GRB 051215: Swift detection of a possible burst
  92. GRB 051215: A short GRB in a cluster?
  93. GRB051105: optical observations
  94. GRB 051213: Swift-BAT refined analysis
  95. GRB 051211B, optical observation
  96. GRB 051213: Swift-BAT detection of a burst
  97. GRB 051211a: RTT150 optical observations
  98. GRB051211B, RBO optical observations
  99. GRB 051211A: Swift/UVOT upper limits
  100. GRB 051211B: Swift/UVOT upper limits - correction

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