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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"

26499 results found.

  1. GRB 060108: further analysis of VLT images
  2. GRB 060108: Evidence for an XRT Position Offset
  3. GRB 060110: KAIT observations
  4. GRB 060111B: Swift XRT refined analysis
  5. GRB 060111A: refined UVOT anaysis
  6. GRB 060111B: MITSuME detection of optical afterglow
  7. GRB 060111B: TAROT optical observation
  8. GRB 060111B: Refined analysis of the Swift-BAT burst
  9. GRB 060110: MARGE observations
  10. GRB 060111B: Gualba observatory limit
  11. GRB 060111: Swift-BAT Refined Analysis
  12. GRB060111.2:_MASTER optical limit
  13. GRB 060111: TAROT optical observation
  14. GRB060111 : XRT refined analysis
  15. GRB 060108: z-band imaging from Gemini-North
  16. GRB 060110a: RAPTOR detection of early optical emission.
  17. GRB 060110: UKIRT K-band observations
  18. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  19. GRB 060110: IR Candidate Afterglow
  20. GRB 060110: Super-LOTIS observations
  21. GRB 060110: Optical limit
  22. GRB 060109: Refined Swift-XRT analysis
  23. GRB 060109: Swift/UVOT upper limits
  24. GRB060108: P200 Ks Observations
  25. GRB 060108: early UKIRT K-band observations
  26. GRB 060109: Swift Detection of a long burst
  27. GRB 060108: a dark burst?
  28. GRB 060108: Refined XRT analysis
  29. GRB 060108: Mitsume optical observations
  30. GRB060108: SDSS pre-burst observations
  31. GRB060108: Faulkes Telescope observation
  32. GRB060108: Swift detection of its 100th GRB
  33. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  34. GRB 060105: Radio observations
  35. Konus-Wind observation of GRB 060105
  36. GRB 060105: BAT refined analysis
  37. GRB 060102 - no XRT afterglow
  38. GRB 060105: XRT refined analysis
  39. Swift-BAT trigger 175653 is not an astrophysical source
  40. GRB 060102: Swift-BAT refined analysis
  41. Time Correction to GRB 060102
  42. GRB051211B: optical observations
  43. GRB 051221B: Optical Observations with Kuiper 1.54m
  44. GRB 051227: optical observation
  45. GRB051221B: Radio observations
  46. GRB 051221A: VLA Radio Observations
  47. GRB051227: Radio Observations
  48. GRB 051227: Confirmed fading from Gemini observations
  49. GRB 051227: optical afterglow
  50. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  51. GRB 051227: Gemini observations
  52. GRB 051227: Magellan r'-band Imaging/Astrometry
  53. GRB 051227: refined analysis of VLT images
  54. GRB 051227: P60 Observations
  55. GRB 051227: R-band object in the XRT error circle
  56. GRB 051227: Joint Swift-HETE Spectral Analysis
  57. GRB 051227: Further analysis of the Swift-BAT burst
  58. GRB 051227: Swift detection of a burst
  59. Konus-Wind observation of GRB 051221A
  60. GRB051221A: Suzaku WAM observation of the prompt emission
  61. GRB 051221A: MDM Optical Observations
  62. GRB051016: analysis of the XMM-Newton observation
  63. GRB 051221A: Detection at 251nm with Swift UVOT
  64. GRB 051221A: Chandra Afterglow Position
  65. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  66. GRB 051221B: TAROT optical limits
  67. GRB 051221: Continued fading of optical afterglow
  68. GRB 051221A: RAPTOR Fading Counterpart Constraint
  69. GRB 051221B: BOOTES optical observations.
  70. GRB 051221: Discovery of fading optical afterglow
  71. GRB051221: K-band source
  72. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  73. GRB 051221: Swift detection of a bright short burst
  74. Refined analysis of the SWIFT J1626.6-5156
  75. GRB051211A (=H3979): Refined Analysis
  76. GRB 051211B: optical afterglow
  77. GRB051211A: possible optical candidate
  78. Swift Trigger 172767 is not a GRB
  79. GRB 051215: near-infrared observations
  80. GRB051215 - SDSS pre-burst observations
  81. GRB 051215: Swift detection of a possible burst
  82. GRB051211B: Probable radio afterglow
  83. GRB051105: optical observations
  84. GRB 051211B, optical observation
  85. GRB 051213: Swift-BAT detection of a burst
  86. GRB051211B, RBO optical observations
  87. GRB 051211B: Swift XRT confirmation of the afterglow
  88. GRB051211B: Liverpool Telescope observation
  89. GRB 051211b: RTT150 optical observations
  90. GRB051211b: P60 Observations
  91. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  92. GRB 051211B: Swift XRT Observations
  93. GRB 051210: Magellan Imaging
  94. GRB 051211: TAROT optical limits
  95. GRB 051211B: a possible optical detection by TAROT
  96. GRB 051211B: a long GRB detected by INTEGRAL
  97. GRB 051210: Swift XRT refined analysis
  98. GRB 051210: FRAM early limit
  99. Swift XRT positions
  100. An extraordinary long burst on December 3 from SGR1806-20

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