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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"

16155 results found.

  1. Optical candidate for GRB000926
  2. GRB 000911, BVRI field photometry
  3. GRB000911: Sub-millimeter observations
  4. GRB000911: Optical Transient
  5. GRB000911, Radio and Optical observations
  6. GRB000911: Optical observations
  7. GRB 000830: Optical observations
  8. GRB000830: Optical observations
  9. GRB000830, TNG B-band observations
  10. GRB000830, BVRI field photometry
  11. GRB000830: Optical observations
  12. GRB000210, Optical observations
  13. Chandra Position of GRB000210
  14. "Snapshot" afterglow IDs and GRB 000830
  15. GRB000830: Optical observations
  16. HST/STIS observations of the host galaxy of GRB 980329
  17. HST/STIS observations of the chaotic environment of GRB 980613
  18. GRB000812, TNG R-band observations
  19. GRB000801, VLT-Antu R-band observations
  20. GRB000301C, UBVI optical observations
  21. GRB 000727, optical observations
  22. GRB 990712: Late time HST/STIS Observations
  23. GRB000630, optical observations
  24. GRB 000630: Detection of the Optical Afterglow
  25. GRB000630, Optical Observations
  26. GRB000630, optical observations
  27. GRB000630, optical observations
  28. GRB000630, BVRI Field Photometry
  29. GRB000630, optical observations
  30. GRB000630, optical observations
  31. GRB000630: Optical observations
  32. GRB000630, Radio Observations
  33. possible optical counterpart of GRB 000630
  34. GRB 000623, optical observations
  35. GRB 000620, optical observations
  36. GRB000418, HST/STIS Observations
  37. GRB 990506, HST/STIS Observations of the Host Galaxy
  38. GRB000620, optical observations
  39. GRB990308, HST/STIS observations of the host galaxy
  40. GRB000620 - Optical observations
  41. GRB000620 Optical observations
  42. GRB000607, optical observations
  43. GRB990123, HST/STIS observations of the host galaxy
  44. GRB000616 optical observations
  45. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  46. GRB000615, further R-band photometry
  47. The Hosts of GRB 980703 and GRB 971214
  48. GRB 000301C: Further Late-Time HST/STIS observations
  49. Optical Follow-up of GRB000529 Error Box
  50. GRB000604 optical non-detection
  51. GRB000604 - Optical observations
  52. GRB000604, optical observations
  53. GRB000528, optical observations at ESO
  54. GRB 000604 optical observations
  55. GRB 000418: Detection of the Host Galaxy
  56. GRB000604, optical observations, comparison with DPOSS
  57. GRB000529: Optical Observations
  58. GRB000519: Optical observations
  59. GRB 000528 Optical Observations
  60. GRB000519, BVRI field photometry
  61. Re: GRB000508B : Optical observations
  62. GRB 000418, Optical observation
  63. GRB000508B, optical photometry
  64. GRB000508B, BVR field photometry
  65. Possible GRB-related phenomenon
  66. GRB000424, UBVRI field photometry
  67. GRB 000424 Optical Observations
  68. GRB000418, UBVRI field photometry update
  69. GRB000424, optical observations
  70. GRB 000429, optical observation
  71. GRB 000429, UBVRI field photometry
  72. GRB000418, Radio detection
  73. GRB 000418, Optical Observation
  74. GRB 000418, optical observation
  75. GRB000424 Optical Observations
  76. GRB 000418, Optical Observation
  77. GRB000424, optical observations
  78. GRB000424, optical observations
  79. GRB 000424, Optical Observations
  80. GRB 000418, Optical Observation
  81. GRB000416 Optical Observations
  82. GRB000416 BRJK observations
  83. GRB 000408, optical observations
  84. GRB 991208, UBVRI field photometry
  85. GRB000301c results
  86. GRB000408: Optical CCD Observations from MIRO
  87. GRB000408, lotis optical observations
  88. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  89. GRB000326 Optical Observations
  90. GRB000301C - R magnitude lower limit
  91. GRB 000323, optical observations
  92. GRB 000326: Optical Observations
  93. GRB 000307 optical observations
  94. GRB000313, Radio observations
  95. GRB 000313 - optical transient in the BATSE error box
  96. GRB000301C - B and R photometry
  97. GRB000301C - R photometry
  98. GRB 000307, Optical Observations
  99. GRB 000307, BVRI Field Photometry
  100. GRB 000301C: Optical Spectrum and Redshift

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Download all Circulars as a .tar.gz archive (updated once a day):
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