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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"

28054 results found.

  1. XRF 080109 / SN 2008D: UKIRT JHK imaging
  2. optical observations, XRT in NGC 2770
  3. XRF 080109/SN 2008D: PROMPT Optical Imaging
  4. Gemini-South observations of XRF 080109 / SN 2008D
  5. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  6. Discovery of Radio Emission from Transient in NGC 2770
  7. XRF 080109 in NGC2770: NIR observations at TNG
  8. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  9. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  10. XRF 080109 in NGC2770: Detectable Superluminal Motion
  11. Refined Swift-XRT analysis of the transient in NGC 2770
  12. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  13. GRB 071227: Suzaku WAM observation of the prompt emission
  14. GRB 071227: optical afterglow
  15. Further Swift-BAT analysis of GRB 071227
  16. Konus-Wind observation of GRB 071227
  17. GRB 071227: Swift-XRT refined analysis
  18. GRB 071227: VLT probable redshift of the candidate host galaxy
  19. GRB071227: Swift/UVOT refined analysis
  20. GRB 071227: REM NIR and Optical observations
  21. Swift-BAT refined analysis of short GRB 071227
  22. GRB 071227: Swift detection of a burst
  23. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  24. GRB 071125: Suzaku WAM observation of the prompt emission
  25. GRB 070429B: Probable host galaxy and redshift
  26. GRB 071129, Swift-BAT refined analysis
  27. GRB 071126: Enhanced Swift-XRT position
  28. GRB071122: Swift/UVOT Observations
  29. GRB071104: NIR Afterglow Candidate at TNG
  30. GRB 071122, Swift-BAT refined analysis
  31. GRB 071122 Swift-XRT refined analysis
  32. GRB 071122: P60 Optical Afterglow Candidate
  33. GRB 071122: Swift detection of a burst
  34. GRB 071118: P60 Observations
  35. GRB071118 MITSuME OAO optical observation
  36. GRB 071118: Observations from OSN
  37. GRB 071117: VLT observations and probable redshift
  38. Swift/UVOT observations of GRB071118
  39. Konus-Wind and Konus-A observations of GRB 071117
  40. Swift XRT follow-up observations of GRB071008
  41. Swift/UVOT upper limits for GRB 071117
  42. GRB071118: Swift XRT refined analysis
  43. GRB 071117: Gemini Optical Afterglow Discovery
  44. GRB 071118, Swift-BAT refined analysis
  45. GRB 071117: TAROT La Silla observatory optical observations
  46. GRB 071118: Swift detection of a burst
  47. GRB 071117: Gemini Observations
  48. GRB 071117: Swift-XRT refined analysis
  49. GRB 071117, Swift-BAT refined analysis
  50. Swift detection of MXB 0656-072
  51. GRB 071112C: Optical and NIR data observed with KANATA
  52. GRB 071112C MITSuME Akeno early optical observation
  53. GRB 071112C: SARA upper limit
  54. GRB 071112C : Second Epoch Lulin R-band observations
  55. GRB071112C MITSuME Okayama Optical Observation
  56. GRB 071112C: Swift-BAT refined analysis
  57. GRB 071112C: Swift XRT refined analysis
  58. Swift UVOT upper limits of GRB071112B
  59. GRB 071112B: Gemini Optical Imaging
  60. GRB 071112B: Swift-XRT preliminary analysis
  61. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  62. GRB 071112C : Lulin R-band observation
  63. GRB 071112C: TAROT Calern observatory optical observations
  64. Swift XRT follow-up observations of GRB071028B
  65. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  66. GRB 071112C: Optical and NIR afterglows observed with KANATA
  67. GRB 071112C: Swift detection of a burst with an optical counterpart
  68. GRB 071112B: Swift detection of a short hard burst
  69. GRB 071112: Swift detection of a possible burst
  70. Swift/UVOT initial analysis of GRB071109
  71. GRB 071109: further Swift-XRT analysis
  72. GRB 071109: TAROT Calern observatory optical observations
  73. GRB 071109: Swift-XRT possible X-ray counterpart
  74. GRB 071109: IBIS refined analysis
  75. GRB 071104: Swift-XRT Team Refined Analysis
  76. GRB 071104: Possible Swift UVOT Afterglow Candidate
  77. GRB 071104: Swift-XRT position
  78. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  79. Swift XRT and UVOT observations of GRB071028B
  80. GRB 071101, Swift-BAT refined analysis
  81. GRB 071101: Swift-XRT Team refined analysis
  82. GRB071101: Optical and NIR upper limits by KANATA
  83. GRB0711101: Two new source from Xinglong TNT observation
  84. GRB 071101: TAROT Calern observatory optical observations
  85. GRB071101 LOAO B,V,R,I observation
  86. GRB 071101: Swift detection of a burst
  87. GRB 071031, Swift-BAT refined analysis
  88. GRB 071031: Swift-XRT Team refined analysis
  89. GRB 071020: MITSuME Akeno optical observations
  90. GRB 071031: REM NIR and Optical observation
  91. GRB 071031: Swift detection of a burst with an optical counterpart
  92. GRB 071028B Swift-BAT detection of a burst
  93. GRB 071028: SARA observations of variable source
  94. Swift UVOT upper limits to GRB071028
  95. GRB071028: Xinglong EST V-band upper limit
  96. GRB 071028: Swift-XRT Team refined analysis
  97. GRB 071028, Swift-BAT refined analysis
  98. GRB 071028: Swift detection of a burst
  99. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  100. GRB071021: MARGE Optical Limits

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