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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"

37905 results found.

  1. GRB 060109: Swift/UVOT upper limits
  2. GRB060109, optical observation
  3. GRB 060108: ISAS early observations and near IR upper limit
  4. GRB060108: P200 Ks Observations
  5. GRB 060108: early UKIRT K-band observations
  6. Swift UVOT correction to GCN 4455
  7. GRB 060109: Swift Detection of a long burst
  8. GRB 060108: a dark burst?
  9. GRB 060108: Refined XRT analysis
  10. GRB 060108: VLT J-band observations
  11. GRB 060108: Mitsume optical observations
  12. GRB 060108: Swift/UVOT upper limits
  13. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  14. GRB060108: SDSS pre-burst observations
  15. GRB060108: Faulkes Telescope observation
  16. GRB 060108: Refined analysis of the Swift-BAT burst
  17. GRB 060108: Swift XRT position
  18. GRB060108: Swift detection of its 100th GRB
  19. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  20. GRB 060105: Radio observations
  21. GRB 060105: MDM Observation
  22. Konus-Wind observation of GRB 060105
  23. GRB 060105: ISAS observations and near IR upper limit
  24. GRB 060105: Swift/UVOT upper limits
  25. GRB 060105: Mitsume optical observations
  26. GRB 060105: BAT refined analysis
  27. GRB 060102 - no XRT afterglow
  28. GRB 060105: XRT refined analysis
  29. GRB060105: Suzaku-XIS and -HXD observation plan
  30. GRB060105, optical observation
  31. GRB060105 : Kiso optical observation
  32. GRB060105: Swift detection of a bright long burst
  33. Swift-BAT trigger 175653 is not an astrophysical source
  34. GRB 060102: MDM Observation
  35. Swift-BAT trigger 175653 is probably not a GRB
  36. GRB 060102: Swift-BAT refined analysis
  37. Time Correction to GRB 060102
  38. GRB 060102: Swift-BAT detection of a burst
  39. GRB051211B: optical observations
  40. GRB051227: SARA Observations
  41. GRB 051221B: Optical Observations with Kuiper 1.54m
  42. GRB 051227: Likely host galaxy underlying afterglow position
  43. GRB 051227: optical observation
  44. GRB051221B: Radio observations
  45. GRB 051221A: VLA Radio Observations
  46. GRB051227: Radio Observations
  47. GRB 051227: Confirmed fading from Gemini observations
  48. GRB051227: further analysis of VLT images
  49. GRB 051227: optical afterglow
  50. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  51. GRB 051227: Gemini observations
  52. GRB 051227: Keck Spectroscopy
  53. GRB 051227: Magellan r'-band Imaging/Astrometry
  54. GRB 051227: refined analysis of VLT images
  55. GRB 051227: P60 Observations
  56. GRB 051227: MDM Observation
  57. GRB 051227: R-band object in the XRT error circle
  58. GRB 051227: Joint Swift-HETE Spectral Analysis
  59. GRB 051227: XRT refined analysis
  60. GRB 051227: Further analysis of the Swift-BAT burst
  61. GRB 051227: Refined analysis of the Swift-BAT burst
  62. GRB051227: SDSS pre-burst observations
  63. GRB 051227, optical observation
  64. GRB 051227: Swift detection of a burst
  65. IBAS_alert n. 2719 : not a real GRB
  66. Konus-Wind observation of GRB 051221A
  67. GRB051221A: Suzaku WAM observation of the prompt emission
  68. GRB 051221A: MDM Optical Observations
  69. GRB051016: analysis of the XMM-Newton observation
  70. GRB 051221A: Detection at 251nm with Swift UVOT
  71. GRB 051221A: Chandra Afterglow Position
  72. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  73. GRB 051221B: ROTSE-III Optical Limits
  74. GRB 051221B: TAROT optical limits
  75. GRB 051221A: WSRT Radio Observations
  76. GRB 051221: Redshift from Gemini
  77. GRB 051221: Continued fading of optical afterglow
  78. GRB 051221B: Refined analysis of the Swift-BAT burst
  79. Possible GRB 051221B: MDM Optical Detection
  80. GRB 051221A: RAPTOR Fading Counterpart Constraint
  81. GRB 051221B: BOOTES optical observations.
  82. Possible GRB 051221B: Swift XRT position
  83. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  84. Swift-BAT detection of a possible burst
  85. GRB 051221: Discovery of fading optical afterglow
  86. GRB 051221: Swift XRT refined analysis
  87. GRB 051221: Swift/UVOT upper limits
  88. GRB 051221: Possible nearby cluster
  89. GRB 051221: No variability in Gemini data
  90. GRB 051221: Correction to GCN #4368
  91. GRB 051221: Gemini observations
  92. GRB 051221: Improved astrometry of the IR counterpart
  93. GRB051221: K-band source
  94. GRB 051221: XRT position
  95. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  96. GRB 051221: IR Observations at GRB+1hr
  97. GRB 051221: Swift detection of a bright short burst
  98. Refined analysis of the SWIFT J1626.6-5156
  99. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  100. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg

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