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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"

28044 results found.

  1. Refined Swift-XRT analysis of the transient in NGC 2770
  2. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  3. GRB 071227: Suzaku WAM observation of the prompt emission
  4. GRB 071227: optical afterglow
  5. Further Swift-BAT analysis of GRB 071227
  6. Konus-Wind observation of GRB 071227
  7. GRB 071227: Swift-XRT refined analysis
  8. GRB 071227: VLT probable redshift of the candidate host galaxy
  9. GRB071227: Swift/UVOT refined analysis
  10. GRB 071227: REM NIR and Optical observations
  11. Swift-BAT refined analysis of short GRB 071227
  12. GRB 071227: Swift detection of a burst
  13. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  14. GRB 071125: Suzaku WAM observation of the prompt emission
  15. GRB 070429B: Probable host galaxy and redshift
  16. GRB 071129, Swift-BAT refined analysis
  17. GRB 071126: Enhanced Swift-XRT position
  18. GRB071122: Swift/UVOT Observations
  19. GRB071104: NIR Afterglow Candidate at TNG
  20. GRB 071122, Swift-BAT refined analysis
  21. GRB 071122 Swift-XRT refined analysis
  22. GRB 071122: P60 Optical Afterglow Candidate
  23. GRB 071122: Swift detection of a burst
  24. GRB 071118: P60 Observations
  25. GRB071118 MITSuME OAO optical observation
  26. GRB 071118: Observations from OSN
  27. GRB 071117: VLT observations and probable redshift
  28. Swift/UVOT observations of GRB071118
  29. Konus-Wind and Konus-A observations of GRB 071117
  30. Swift XRT follow-up observations of GRB071008
  31. Swift/UVOT upper limits for GRB 071117
  32. GRB071118: Swift XRT refined analysis
  33. GRB 071117: Gemini Optical Afterglow Discovery
  34. GRB 071118, Swift-BAT refined analysis
  35. GRB 071117: TAROT La Silla observatory optical observations
  36. GRB 071118: Swift detection of a burst
  37. GRB 071117: Gemini Observations
  38. GRB 071117: Swift-XRT refined analysis
  39. GRB 071117, Swift-BAT refined analysis
  40. Swift detection of MXB 0656-072
  41. GRB 071112C: Optical and NIR data observed with KANATA
  42. GRB 071112C MITSuME Akeno early optical observation
  43. GRB 071112C: SARA upper limit
  44. GRB 071112C : Second Epoch Lulin R-band observations
  45. GRB071112C MITSuME Okayama Optical Observation
  46. GRB 071112C: Swift-BAT refined analysis
  47. GRB 071112C: Swift XRT refined analysis
  48. Swift UVOT upper limits of GRB071112B
  49. GRB 071112B: Gemini Optical Imaging
  50. GRB 071112B: Swift-XRT preliminary analysis
  51. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  52. GRB 071112C : Lulin R-band observation
  53. GRB 071112C: TAROT Calern observatory optical observations
  54. Swift XRT follow-up observations of GRB071028B
  55. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  56. GRB 071112C: Optical and NIR afterglows observed with KANATA
  57. GRB 071112C: Swift detection of a burst with an optical counterpart
  58. GRB 071112B: Swift detection of a short hard burst
  59. GRB 071112: Swift detection of a possible burst
  60. Swift/UVOT initial analysis of GRB071109
  61. GRB 071109: further Swift-XRT analysis
  62. GRB 071109: TAROT Calern observatory optical observations
  63. GRB 071109: Swift-XRT possible X-ray counterpart
  64. GRB 071109: IBIS refined analysis
  65. GRB 071104: Swift-XRT Team Refined Analysis
  66. GRB 071104: Possible Swift UVOT Afterglow Candidate
  67. GRB 071104: Swift-XRT position
  68. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  69. Swift XRT and UVOT observations of GRB071028B
  70. GRB 071101, Swift-BAT refined analysis
  71. GRB 071101: Swift-XRT Team refined analysis
  72. GRB071101: Optical and NIR upper limits by KANATA
  73. GRB0711101: Two new source from Xinglong TNT observation
  74. GRB 071101: TAROT Calern observatory optical observations
  75. GRB071101 LOAO B,V,R,I observation
  76. GRB 071101: Swift detection of a burst
  77. GRB 071031, Swift-BAT refined analysis
  78. GRB 071031: Swift-XRT Team refined analysis
  79. GRB 071020: MITSuME Akeno optical observations
  80. GRB 071031: REM NIR and Optical observation
  81. GRB 071031: Swift detection of a burst with an optical counterpart
  82. GRB 071028B Swift-BAT detection of a burst
  83. GRB 071028: SARA observations of variable source
  84. Swift UVOT upper limits to GRB071028
  85. GRB071028: Xinglong EST V-band upper limit
  86. GRB 071028: Swift-XRT Team refined analysis
  87. GRB 071028, Swift-BAT refined analysis
  88. GRB 071028: Swift detection of a burst
  89. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  90. GRB071021: MARGE Optical Limits
  91. GRB071020, optical upper limit
  92. GRB 071025: SARA VRI upper limits
  93. Swift UVOT upper limits
  94. GRB071025: Xinglong TNT I-band upper limit
  95. GRB 071025: Swift-XRT Team refined analysis
  96. GRB 060602A: host redshift
  97. GRB 071025, Swift-BAT refined analysis
  98. GRB071021 : CFHT Ks-band observation
  99. GRB 071025: ROTSE-III Refined Analysis
  100. GRB 071025a: PAIRITEL observations

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