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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"

18334 results found.

  1. GRB000408: Optical CCD Observations from MIRO
  2. GRB000408, lotis optical observations
  3. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  4. GRB000408 [IPN Position]
  5. GRB000301C - Addendum to GCN 623
  6. GRB 000326: Optical Observations
  7. GRB000326, Radio observations
  8. GRB000313, Radio observations
  9. GRB 000313 - optical transient in the BATSE error box
  10. GRB 000307, BVRI Field Photometry
  11. GRB 000301C: HST/STIS CCD Imaging of the field
  12. GRB 000301C Optical Observations
  13. GRB 000301C: K' Observations
  14. GRB000301C - Host galaxy not detected in R (?)
  15. Optical observations of GRB000301c
  16. GRB000301C, Radio observations
  17. GRB000301C, Radio observations
  18. GRB 000301c near-IR observations
  19. GRB 000301C, UBVRI field photometry
  20. GRB 000301C: OT confirmed
  21. GRB000301c optical observations
  22. GRB000301C
  23. GRB 000301C : Optical Candidate
  24. HST Observations of GRB 990712
  25. GRB 000214 near-IR observations
  26. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  27. GRB000210, Radio Observations
  28. GRB 000115, BVRI field photometry
  29. GRB000214: BeppoSAX GRBM and WFC Detection
  30. Optical observations of GRB000210
  31. GRB000210 X-ray afterglow
  32. GRB000214: X-ray afterglow candidate
  33. GRB000214 refined BeppoSAX-WFC position
  34. Optical observations of the Chandra X-ray source for GRB000210
  35. GRB000210, Radio Observations
  36. GRB000201, Radio Observations
  37. GRB000210: BeppoSAX GRBM and WFC Detection
  38. GRB000201 Optical Observations
  39. GRB 000126, optical observations
  40. GRB991216, UBVRIJHK field photometry
  41. GCN resumes full operations
  42. GRB 991216: Detection of the Host and/or Absorber Galaxy
  43. IPN error box for GRB991216
  44. GRB 991217 (SAX J2303.2+0015) Optical observations
  45. Chandra observation of the X-ray afterglow of GRB991216
  46. SAX J2303.2+0015 Optical observations
  47. IR observations of GRB991216
  48. GRB 991217 (SAX J2303.2+0015) Optical observations
  49. GRB 991216 Radio Observations
  50. GRB 991208 Infrared Detection
  51. GRB991216
  52. GRB 991216--Summary of RXTE Observations
  53. GRB 991216 Optical Observations
  54. GRB 991216, optical observations
  55. GRB 991208 SAO-RAS Spectroscopy
  56. SAX J2303.2+0015: an x-ray/GRB?
  57. GRB 991216, Optical Transient
  58. GRB991216 ('Beethoven Burst') B, R, and K Observations
  59. GRB991216, infrared observations
  60. GRB 991208 optical observations
  61. GRB 991216 Optical Observation
  62. GRB 991216: Extremely bright BATSE burst
  63. GRB991208, optical observations
  64. GRB 991208, Optical Observation
  65. GRB991208, optical observations
  66. Optical Observations of GRB991105
  67. GRB991106: BeppoSAX/BATSE results
  68. BeppoSAX NFI Observation of GRB991106
  69. GRB 991106, radio observations
  70. GRB991106: the first BeppoSAX short GRB detection?
  71. GRB 991106 Optical Observations
  72. GRB991106, optical observation at SAO-RAS
  73. GRB 991106, LOTIS Optical Observations
  74. GRB991105: SAX-GRBM/-WFC detection
  75. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  76. GRB 991014, Optical Observations
  77. GRB 991014 - BeppoSAX NFI observations
  78. GRB 991014, radio observations
  79. GRB 991014, Optical Observations
  80. GRB 991014, optical observations
  81. Super-LOTIS optical observation of GRB991014
  82. Optical Observations of GRB990907
  83. GRB990907 and 990908
  84. GRB990806 BeppoSAX follow up
  85. GRB 990806 Optical observations
  86. GRB 990806, optical observations
  87. GRB 990806, Optical Observations
  88. GRB 990712 Optical Observations
  89. GRB 990712
  90. Late-time HST/STIS Observations of GRB 990510
  91. BeppoSAX NFI Observation of GRB990705
  92. BeppoSAX NFI Observation of GRB990705
  93. GRB 990705, R-band observations
  94. GRB990704: SAX-NFI results summary
  95. GRB990704 radio and optical observations
  96. GRB990704
  97. GRB990704, optical observations
  98. Late-time HST/STIS Observation of GRB 990123
  99. Optical Observations of GRB 990506
  100. GRB990527 Optical Observations

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