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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36145 results found.

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

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