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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"

27391 results found.

  1. GRB 080129: Swift/UVOT Refined Upper Limits
  2. Swift/UVOT observations of GRB080130
  3. GRB 080130: REM NIR observations
  4. GRB 080130(?): Swift XRT observation
  5. GRB 080129: Swift-XRT refined analysis
  6. GRB 080129: KAIT optical limits
  7. GRB 080129, Swift-BAT refined analysis
  8. GRB 080129: TAROT La Silla observatory optical observations
  9. GRB 080129: GROND detection in all bands, and fading
  10. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  11. GRB 080129: Enhanced Swift-XRT position
  12. GRB 080129: Gemini-South Imaging Observations
  13. GRB 080129 (?): UVOT Upper Limits
  14. A new website of high-level data products for Swift GRBs
  15. GRB 080123 : Suzaku WAM observation of the prompt emission
  16. Transient 080109/SN 2008D: Spectroscopic Evolution
  17. Konus-Wind observation of GRB 080122
  18. GRB 080122 : Suzaku WAM observation of the prompt emission
  19. GRB 080121: Swift/UVOT upper limits
  20. SNe 2008D and 2007uy: Chandra Detections
  21. GRB 080121: Enhanced Swift-XRT position
  22. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  23. IPN triangulation of GRB080122
  24. GRB 080121: Nearby SDSS galaxies
  25. GRB 080123: Swift-XRT refined analysis
  26. GRB 080123: Swift/UVOT refined analysis
  27. GRB 080123, Swift-BAT refined analysis
  28. GRB 080123: Enhanced Swift-XRT position
  29. GRB 080123: Swift detection of a short burst
  30. GRB 080120: GROND confirmation of the optical afterglow
  31. VLA radio upper limit on GRB 080120
  32. GRB 080120: Swift-XRT refined analysis
  33. GRB 080120: GROND detection
  34. GRB080120: Swift XRT position
  35. GRB 080120: a long GRB detected by INTEGRAL
  36. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  37. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  38. XRF 080109 / SN 2008D: UKIRT JHK imaging
  39. optical observations, XRT in NGC 2770
  40. XRF 080109/SN 2008D: PROMPT Optical Imaging
  41. Gemini-South observations of XRF 080109 / SN 2008D
  42. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  43. Discovery of Radio Emission from Transient in NGC 2770
  44. XRF 080109 in NGC2770: NIR observations at TNG
  45. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  46. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  47. XRF 080109 in NGC2770: Detectable Superluminal Motion
  48. Refined Swift-XRT analysis of the transient in NGC 2770
  49. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  50. GRB 071227: Suzaku WAM observation of the prompt emission
  51. GRB 071227: optical afterglow
  52. Further Swift-BAT analysis of GRB 071227
  53. Konus-Wind observation of GRB 071227
  54. GRB 071227: Swift-XRT refined analysis
  55. GRB 071227: VLT probable redshift of the candidate host galaxy
  56. GRB071227: Swift/UVOT refined analysis
  57. GRB 071227: REM NIR and Optical observations
  58. Swift-BAT refined analysis of short GRB 071227
  59. GRB 071227: Swift detection of a burst
  60. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  61. GRB 071125: Suzaku WAM observation of the prompt emission
  62. GRB 070429B: Probable host galaxy and redshift
  63. GRB 071129, Swift-BAT refined analysis
  64. GRB 071126: Enhanced Swift-XRT position
  65. GRB071122: Swift/UVOT Observations
  66. GRB071104: NIR Afterglow Candidate at TNG
  67. GRB 071122, Swift-BAT refined analysis
  68. GRB 071122 Swift-XRT refined analysis
  69. GRB 071122: P60 Optical Afterglow Candidate
  70. GRB 071122: Swift detection of a burst
  71. GRB 071118: P60 Observations
  72. GRB071118 MITSuME OAO optical observation
  73. GRB 071118: Observations from OSN
  74. GRB 071117: VLT observations and probable redshift
  75. Swift/UVOT observations of GRB071118
  76. Konus-Wind and Konus-A observations of GRB 071117
  77. Swift XRT follow-up observations of GRB071008
  78. Swift/UVOT upper limits for GRB 071117
  79. GRB071118: Swift XRT refined analysis
  80. GRB 071117: Gemini Optical Afterglow Discovery
  81. GRB 071118, Swift-BAT refined analysis
  82. GRB 071117: TAROT La Silla observatory optical observations
  83. GRB 071118: Swift detection of a burst
  84. GRB 071117: Gemini Observations
  85. GRB 071117: Swift-XRT refined analysis
  86. GRB 071117, Swift-BAT refined analysis
  87. Swift detection of MXB 0656-072
  88. GRB 071112C: Optical and NIR data observed with KANATA
  89. GRB 071112C MITSuME Akeno early optical observation
  90. GRB 071112C: SARA upper limit
  91. GRB 071112C : Second Epoch Lulin R-band observations
  92. GRB071112C MITSuME Okayama Optical Observation
  93. GRB 071112C: Swift-BAT refined analysis
  94. GRB 071112C: Swift XRT refined analysis
  95. Swift UVOT upper limits of GRB071112B
  96. GRB 071112B: Gemini Optical Imaging
  97. GRB 071112B: Swift-XRT preliminary analysis
  98. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  99. GRB 071112C : Lulin R-band observation
  100. GRB 071112C: TAROT Calern observatory optical observations

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