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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"

36231 results found.

  1. GRB060108: P200 Ks Observations
  2. GRB 060108: early UKIRT K-band observations
  3. Swift UVOT correction to GCN 4455
  4. GRB 060109: Swift Detection of a long burst
  5. GRB 060108: a dark burst?
  6. GRB 060108: Refined XRT analysis
  7. GRB 060108: VLT J-band observations
  8. GRB 060108: Mitsume optical observations
  9. GRB 060108: Swift/UVOT upper limits
  10. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  11. GRB060108: SDSS pre-burst observations
  12. GRB060108: Faulkes Telescope observation
  13. GRB 060108: Refined analysis of the Swift-BAT burst
  14. GRB 060108: Swift XRT position
  15. GRB060108: Swift detection of its 100th GRB
  16. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  17. GRB 060105: Radio observations
  18. GRB 060105: MDM Observation
  19. Konus-Wind observation of GRB 060105
  20. GRB 060105: ISAS observations and near IR upper limit
  21. GRB 060105: Swift/UVOT upper limits
  22. GRB 060105: Mitsume optical observations
  23. GRB 060105: BAT refined analysis
  24. GRB 060102 - no XRT afterglow
  25. GRB 060105: XRT refined analysis
  26. GRB060105: Suzaku-XIS and -HXD observation plan
  27. GRB060105, optical observation
  28. GRB060105 : Kiso optical observation
  29. GRB060105: Swift detection of a bright long burst
  30. Swift-BAT trigger 175653 is not an astrophysical source
  31. GRB 060102: MDM Observation
  32. Swift-BAT trigger 175653 is probably not a GRB
  33. GRB 060102: Swift-BAT refined analysis
  34. Time Correction to GRB 060102
  35. GRB 060102: Swift-BAT detection of a burst
  36. GRB051211B: optical observations
  37. GRB051227: SARA Observations
  38. GRB 051221B: Optical Observations with Kuiper 1.54m
  39. GRB 051227: Likely host galaxy underlying afterglow position
  40. GRB 051227: optical observation
  41. GRB 051221A: VLA Radio Observations
  42. GRB 051227: Confirmed fading from Gemini observations
  43. GRB051227: further analysis of VLT images
  44. GRB 051227: optical afterglow
  45. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  46. GRB 051227: Gemini observations
  47. GRB 051227: Keck Spectroscopy
  48. GRB 051227: Magellan r'-band Imaging/Astrometry
  49. GRB 051227: refined analysis of VLT images
  50. GRB 051227: P60 Observations
  51. GRB 051227: MDM Observation
  52. GRB 051227: R-band object in the XRT error circle
  53. GRB 051227: Joint Swift-HETE Spectral Analysis
  54. GRB 051227: XRT refined analysis
  55. GRB 051227: Further analysis of the Swift-BAT burst
  56. GRB 051227: Refined analysis of the Swift-BAT burst
  57. GRB051227: SDSS pre-burst observations
  58. GRB 051227, optical observation
  59. GRB 051227: Swift detection of a burst
  60. IBAS_alert n. 2719 : not a real GRB
  61. Konus-Wind observation of GRB 051221A
  62. GRB051221A: Suzaku WAM observation of the prompt emission
  63. GRB 051221A: MDM Optical Observations
  64. GRB051016: analysis of the XMM-Newton observation
  65. GRB 051221A: Detection at 251nm with Swift UVOT
  66. GRB 051221A: Chandra Afterglow Position
  67. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  68. GRB 051221B: ROTSE-III Optical Limits
  69. GRB 051221B: TAROT optical limits
  70. GRB 051221A: WSRT Radio Observations
  71. GRB 051221: Redshift from Gemini
  72. GRB 051221: Continued fading of optical afterglow
  73. GRB 051221B: Refined analysis of the Swift-BAT burst
  74. Possible GRB 051221B: MDM Optical Detection
  75. GRB 051221A: RAPTOR Fading Counterpart Constraint
  76. GRB 051221B: BOOTES optical observations.
  77. Possible GRB 051221B: Swift XRT position
  78. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  79. Swift-BAT detection of a possible burst
  80. GRB 051221: Discovery of fading optical afterglow
  81. GRB 051221: Swift XRT refined analysis
  82. GRB 051221: Swift/UVOT upper limits
  83. GRB 051221: Possible nearby cluster
  84. GRB 051221: No variability in Gemini data
  85. GRB 051221: Correction to GCN #4368
  86. GRB 051221: Gemini observations
  87. GRB 051221: Improved astrometry of the IR counterpart
  88. GRB051221: K-band source
  89. GRB 051221: XRT position
  90. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  91. GRB 051221: IR Observations at GRB+1hr
  92. GRB 051221: Swift detection of a bright short burst
  93. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  94. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  95. GRB 051211B: optical afterglow
  96. Swift detection of an RS CVn flare star
  97. GRB051211A: possible optical candidate
  98. Swift Trigger 172767 is not a GRB
  99. GRB 051215: near-infrared observations
  100. GRB051215 - SDSS pre-burst observations

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