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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"

36351 results found.

  1. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  2. GRB 080129: Enhanced Swift-XRT position
  3. GRB 080129: Gemini-South Imaging Observations
  4. GRB 080129: Swift XRT position
  5. GRB 080129 (?): UVOT Upper Limits
  6. GRB 080129 (?): Swift detection of a possible burst
  7. A new website of high-level data products for Swift GRBs
  8. GRB 080121: Upper limit on X-ray afterglow
  9. GRB 080123 : Suzaku WAM observation of the prompt emission
  10. Swift trigger(=301779) is not a GRB
  11. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  12. Konus-Wind observation of GRB 080122
  13. GRB 080122 : Suzaku WAM observation of the prompt emission
  14. GRB 080121: Swift/UVOT upper limits
  15. SNe 2008D and 2007uy: Chandra Detections
  16. GRB 080121 position was incorrect
  17. GRB 080121: Enhanced Swift-XRT position
  18. IPN triangulation of GRB080122
  19. GRB 080121: Nearby SDSS galaxies
  20. GRB 080121: Swift-BAT detection of a very weak, short burst
  21. GRB 080123: Swift-XRT refined analysis
  22. GRB 080123: Swift/UVOT refined analysis
  23. X-ray transient in NGC 2770: RTT150 optical observations
  24. GRB 080123, Swift-BAT refined analysis
  25. GRB 080123: Enhanced Swift-XRT position
  26. GRB 080123: Swift detection of a short burst
  27. GRB 080120: GROND confirmation of the optical afterglow
  28. VLA radio upper limit on GRB 080120
  29. GRB 080120: Swift-XRT refined analysis
  30. GRB 080120: GROND detection
  31. GRB 080120 : Planned XMM-Newton observation
  32. GRB080120: Swift XRT position
  33. GRB 080120: a long GRB detected by INTEGRAL
  34. XRF 080109 / SN 2008D: spectroscopic evolution
  35. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  36. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  37. XRF 080109 in NGC2770: Detectable Superluminal Motion
  38. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  39. Transient in NGC 2770: spectroscopic evidence for a SN
  40. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  41. GRB 071227: Suzaku WAM observation of the prompt emission
  42. GRB 071227: optical afterglow
  43. Further Swift-BAT analysis of GRB 071227
  44. Konus-Wind observation of GRB 071227
  45. GRB 071227: Magellan redshift confirmation
  46. GRB 071227: Swift-XRT refined analysis
  47. GRB 071227: VLT probable redshift of the candidate host galaxy
  48. GRB 071227: Magellan observations
  49. GRB 071227: REM NIR and Optical observations
  50. Swift-BAT refined analysis of short GRB 071227
  51. GRB 071227: Swift detection of a burst
  52. GRB071020: optical observations
  53. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  54. Swift-BAT trigger 298308 is not a GRB
  55. GRB 071208?: Swift detection of a possible burst
  56. IBAS Alert #4772 in not a GRB
  57. GRB 071125: Suzaku WAM observation of the prompt emission
  58. GRB 070429B: Probable host galaxy and redshift
  59. GRB 071129, Swift-BAT refined analysis
  60. GRB 071129: Swift detection of a burst
  61. Konus-Wind and Konus-A observations of GRB 071125
  62. IPN triangulation of very bright GRB 071125
  63. GRB 071112C: Optical/NIR observations
  64. Disregard the "GRB 071126" position
  65. GRB 071126: Enhanced Swift-XRT position
  66. VLA radio detection of GRB 071122
  67. GRB071122: Swift/UVOT Observations
  68. GRB071104: NIR Afterglow Candidate at TNG
  69. GRB 071122: MASTER optical observation
  70. GRB 071122, Swift-BAT refined analysis
  71. GRB 071122 Swift XRT position update sent in error.
  72. GRB 071122 Swift-XRT refined analysis
  73. GRB 071122: Corrected P60 Coordinates
  74. GRB071122: Gemini Absorption redshift
  75. GRB 071122: P60 Optical Afterglow Candidate
  76. GRB 071122: ROTSE-III Optical Limits
  77. GRB 071122: Swift detection of a burst
  78. GRB 071118: P60 Observations
  79. GRB071118 MITSuME OAO optical observation
  80. GRB 071118: Observations from OSN
  81. GRB 071117: VLT observations and probable redshift
  82. Swift/UVOT observations of GRB071118
  83. GRB 071117: Swift-XRT revised position
  84. Konus-Wind and Konus-A observations of GRB 071117
  85. Swift XRT follow-up observations of GRB071008
  86. Swift/UVOT upper limits for GRB 071117
  87. GRB071118: Swift XRT refined analysis
  88. GRB 071117: Gemini Optical Afterglow Discovery
  89. GRB 071118, Swift-BAT refined analysis
  90. GRB 071117: TAROT La Silla observatory optical observations
  91. GRB 071112B: Gemini Image Differencing
  92. GRB 071118: Swift detection of a burst
  93. GRB 071117: Gemini Observations
  94. GRB 071117: Las Campanas optical observations
  95. GRB 071117: Swift-XRT refined analysis
  96. GRB 071117, Swift-BAT refined analysis
  97. VLT FORS2 observations of short hard GRB071112B
  98. GRB 071117: Swift/XRT position
  99. GRB 071117: Initial Swift/UVOT observations
  100. GRB 071117: Swift detection of a bright burst

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