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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"

36053 results found.

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

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