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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"

36339 results found.

  1. Correction to GRB 060109 XRT analysis
  2. GRB 050110: IR Observations
  3. GRB 060110: Optical limit
  4. GRB 060110: Swift-BAT detection of a burst
  5. GRB 060109: Refined Swift-XRT analysis
  6. GRB 060109: Swift/UVOT upper limits
  7. GRB060109, optical observation
  8. GRB 060108: ISAS early observations and near IR upper limit
  9. GRB060108: P200 Ks Observations
  10. GRB 060108: early UKIRT K-band observations
  11. Swift UVOT correction to GCN 4455
  12. GRB 060109: Swift Detection of a long burst
  13. GRB 060108: a dark burst?
  14. GRB 060108: Refined XRT analysis
  15. GRB 060108: VLT J-band observations
  16. GRB 060108: Mitsume optical observations
  17. GRB 060108: Swift/UVOT upper limits
  18. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  19. GRB060108: SDSS pre-burst observations
  20. GRB060108: Faulkes Telescope observation
  21. GRB 060108: Refined analysis of the Swift-BAT burst
  22. GRB 060108: Swift XRT position
  23. GRB060108: Swift detection of its 100th GRB
  24. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  25. GRB 060105: Radio observations
  26. GRB 060105: MDM Observation
  27. Konus-Wind observation of GRB 060105
  28. GRB 060105: ISAS observations and near IR upper limit
  29. GRB 060105: Swift/UVOT upper limits
  30. GRB 060105: Mitsume optical observations
  31. GRB 060105: BAT refined analysis
  32. GRB 060102 - no XRT afterglow
  33. GRB 060105: XRT refined analysis
  34. GRB060105: Suzaku-XIS and -HXD observation plan
  35. GRB060105, optical observation
  36. GRB060105 : Kiso optical observation
  37. GRB060105: Swift detection of a bright long burst
  38. Swift-BAT trigger 175653 is not an astrophysical source
  39. GRB 060102: MDM Observation
  40. Swift-BAT trigger 175653 is probably not a GRB
  41. GRB 060102: Swift-BAT refined analysis
  42. Time Correction to GRB 060102
  43. GRB 060102: Swift-BAT detection of a burst
  44. GRB051211B: optical observations
  45. GRB051227: SARA Observations
  46. GRB 051221B: Optical Observations with Kuiper 1.54m
  47. GRB 051227: Likely host galaxy underlying afterglow position
  48. GRB 051227: optical observation
  49. GRB 051221A: VLA Radio Observations
  50. GRB 051227: Confirmed fading from Gemini observations
  51. GRB051227: further analysis of VLT images
  52. GRB 051227: optical afterglow
  53. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  54. GRB 051227: Gemini observations
  55. GRB 051227: Keck Spectroscopy
  56. GRB 051227: Magellan r'-band Imaging/Astrometry
  57. GRB 051227: refined analysis of VLT images
  58. GRB 051227: P60 Observations
  59. GRB 051227: MDM Observation
  60. GRB 051227: R-band object in the XRT error circle
  61. GRB 051227: Joint Swift-HETE Spectral Analysis
  62. GRB 051227: XRT refined analysis
  63. GRB 051227: Further analysis of the Swift-BAT burst
  64. GRB 051227: Refined analysis of the Swift-BAT burst
  65. GRB051227: SDSS pre-burst observations
  66. GRB 051227, optical observation
  67. GRB 051227: Swift detection of a burst
  68. IBAS_alert n. 2719 : not a real GRB
  69. Konus-Wind observation of GRB 051221A
  70. GRB051221A: Suzaku WAM observation of the prompt emission
  71. GRB 051221A: MDM Optical Observations
  72. GRB051016: analysis of the XMM-Newton observation
  73. GRB 051221A: Detection at 251nm with Swift UVOT
  74. GRB 051221A: Chandra Afterglow Position
  75. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  76. GRB 051221B: ROTSE-III Optical Limits
  77. GRB 051221B: TAROT optical limits
  78. GRB 051221A: WSRT Radio Observations
  79. GRB 051221: Redshift from Gemini
  80. GRB 051221: Continued fading of optical afterglow
  81. GRB 051221B: Refined analysis of the Swift-BAT burst
  82. Possible GRB 051221B: MDM Optical Detection
  83. GRB 051221A: RAPTOR Fading Counterpart Constraint
  84. GRB 051221B: BOOTES optical observations.
  85. Possible GRB 051221B: Swift XRT position
  86. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  87. Swift-BAT detection of a possible burst
  88. GRB 051221: Discovery of fading optical afterglow
  89. GRB 051221: Swift XRT refined analysis
  90. GRB 051221: Swift/UVOT upper limits
  91. GRB 051221: Possible nearby cluster
  92. GRB 051221: No variability in Gemini data
  93. GRB 051221: Correction to GCN #4368
  94. GRB 051221: Gemini observations
  95. GRB 051221: Improved astrometry of the IR counterpart
  96. GRB051221: K-band source
  97. GRB 051221: XRT position
  98. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  99. GRB 051221: IR Observations at GRB+1hr
  100. GRB 051221: Swift detection of a bright short burst

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