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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"

45678 results found.

  1. GRB060108: Swift detection of its 100th GRB
  2. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  3. GRB 060105: Radio observations
  4. GRB 060105: MDM Observation
  5. Konus-Wind observation of GRB 060105
  6. GRB 060105: ISAS observations and near IR upper limit
  7. GRB 060105: Swift/UVOT upper limits
  8. GRB 060105: Mitsume optical observations
  9. GRB 060105: BAT refined analysis
  10. GRB 060105: XRT refined analysis
  11. GRB060105: Suzaku-XIS and -HXD observation plan
  12. GRB060105, optical observation
  13. GRB060105 : Kiso optical observation
  14. GRB060105: Swift detection of a bright long burst
  15. Swift-BAT trigger 175653 is not an astrophysical source
  16. GRB 060102: MDM Observation
  17. Swift-BAT trigger 175653 is probably not a GRB
  18. GRB 060102: Swift-BAT refined analysis
  19. Time Correction to GRB 060102
  20. GRB 060102: Swift-BAT detection of a burst
  21. GRB051211B: optical observations
  22. GRB051227: SARA Observations
  23. GRB 051221B: Optical Observations with Kuiper 1.54m
  24. GRB 051227: Likely host galaxy underlying afterglow position
  25. GRB 051227: optical observation
  26. GRB051221B: Radio observations
  27. GRB 051221A: VLA Radio Observations
  28. GRB051227: Radio Observations
  29. GRB 051227: Confirmed fading from Gemini observations
  30. GRB051227: further analysis of VLT images
  31. GRB 051227: optical afterglow
  32. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  33. GRB 051227: Gemini observations
  34. GRB 051227: Keck Spectroscopy
  35. GRB 051227: Magellan r'-band Imaging/Astrometry
  36. GRB 051227: refined analysis of VLT images
  37. GRB 051227: P60 Observations
  38. GRB 051227: MDM Observation
  39. GRB 051227: R-band object in the XRT error circle
  40. GRB 051227: Joint Swift-HETE Spectral Analysis
  41. GRB 051227: XRT refined analysis
  42. GRB 051227: Further analysis of the Swift-BAT burst
  43. GRB 051227: Refined analysis of the Swift-BAT burst
  44. GRB051227: SDSS pre-burst observations
  45. GRB 051227, optical observation
  46. GRB 051227: Swift detection of a burst
  47. GRB051117B: optical observation
  48. IBAS_alert n. 2719 : not a real GRB
  49. Konus-Wind observation of GRB 051221A
  50. GRB051221A: Suzaku WAM observation of the prompt emission
  51. GRB 051221A: MDM Optical Observations
  52. GRB051016: analysis of the XMM-Newton observation
  53. GRB 051221A: Detection at 251nm with Swift UVOT
  54. GRB 051221A: Chandra Afterglow Position
  55. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  56. GRB 051221B: ROTSE-III Optical Limits
  57. GRB 051221B: TAROT optical limits
  58. GRB 051221A: WSRT Radio Observations
  59. GRB 051221: Redshift from Gemini
  60. GRB 051221: Continued fading of optical afterglow
  61. GRB 051221B: Refined analysis of the Swift-BAT burst
  62. Possible GRB 051221B: MDM Optical Detection
  63. GRB 051221A: RAPTOR Fading Counterpart Constraint
  64. GRB 051221B: BOOTES optical observations.
  65. Possible GRB 051221B: Swift XRT position
  66. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  67. Swift-BAT detection of a possible burst
  68. GRB 051221: Discovery of fading optical afterglow
  69. GRB 051221: Swift XRT refined analysis
  70. GRB 051221: Swift/UVOT upper limits
  71. GRB 051221: Possible nearby cluster
  72. GRB 051221: No variability in Gemini data
  73. GRB 051221: Correction to GCN #4368
  74. GRB 051221: Gemini observations
  75. GRB 051221: Improved astrometry of the IR counterpart
  76. GRB051221: K-band source
  77. GRB 051221: XRT position
  78. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  79. GRB 051221: IR Observations at GRB+1hr
  80. GRB 051221: Swift detection of a bright short burst
  81. Refined analysis of the SWIFT J1626.6-5156
  82. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  83. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  84. GRB051211A (=H3979): Refined Analysis
  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. GRB051211B: Probable radio afterglow
  94. GRB051105: optical observations
  95. GRB 051213: Swift-BAT refined analysis
  96. GRB051211B: XRT refined analysis
  97. GRB 051211B, optical observation
  98. GRB 051213: Swift-BAT detection of a burst
  99. GRB 051211a: RTT150 optical observations
  100. GRB051211B, RBO optical observations

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