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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"

25841 results found.

  1. GRB 000301C: K' Observations
  2. GRB000301C - Host galaxy not detected in R (?)
  3. Optical observations of GRB000301c
  4. GRB000301C, Radio observations
  5. GRB000301C, Radio observations
  6. GRB000301C, near-infrared observations (JHK' imaging)
  7. GRB 000301c near-IR observations
  8. GRB 000301C, Optical Color
  9. GRB 000301C, UBVRI field photometry
  10. GRB000301C 250 GHz detection
  11. GRB000301C, near-infrared observations (JHK' photometry)
  12. GRB 000301C: OT confirmed
  13. GRB000301c optical observations
  14. GRB000301C
  15. GRB 000301C : Optical Candidate
  16. Radio observations of the error box of GRB000301A
  17. GRB000301A [IPN Position]
  18. GRB000226 [IPN Position]
  19. HST Observations of GRB 990712
  20. GRB 000214 near-IR observations
  21. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  22. GRB000210, Radio Observations
  23. GRB 000115, BVRI field photometry
  24. GRB000214: BeppoSAX GRBM and WFC Detection
  25. IPN annulus for GRB000214
  26. Optical observations of GRB000210
  27. GRB000210 X-ray afterglow
  28. GRB000214: X-ray afterglow candidate
  29. GRB000214 refined BeppoSAX-WFC position
  30. GRB 000210: BATSE Observations
  31. Optical observations of the Chandra X-ray source for GRB000210
  32. GRB000210, Radio Observations
  33. Optical candidate for GRB000210
  34. Chandra Observations of GRB000210 X-ray Afterglow
  35. GRB000210: possible afterglow detection with BeppoSAX NFI
  36. GRB000201, Radio Observations
  37. GRB000210: BeppoSAX GRBM and WFC Detection
  38. Optical observations of GRB000131
  39. GRB000201 Optical Observations
  40. GRB 000131 Optical Observations
  41. BATSE+IPN location of GRB000131
  42. IPN localization of GRB000131
  43. GRB 000126, optical observations
  44. IPN localization of GRB000126
  45. BATSE Observations of GRB000115
  46. GRB991216, UBVRIJHK field photometry
  47. GCN resumes full operations
  48. GRB 991216 VLBA Observations
  49. IPN error boxes for GRB991229
  50. GRB 991216: Detection of the Host and/or Absorber Galaxy
  51. IPN localization of GRB991226
  52. IPN error boxes for GRB991221
  53. GRB 991216 RXTE ASM Observations
  54. GRB 991216: Updated BATSE parameters
  55. GRB 991217 (SAX J2303.2+0015) Optical observations
  56. GRB991217/SAX J2303.2+0015, optical observations
  57. Chandra observation of the X-ray afterglow of GRB991216
  58. K observations of GRB991216
  59. SAX J2303.2+0015 Optical observations
  60. IR observations of GRB991216
  61. GRB 991217 (SAX J2303.2+0015) Optical observations
  62. GRB 991216 Radio Observations
  63. GRB 991208 Infrared Detection
  64. GRB991216
  65. GRB 991216--Summary of RXTE Observations
  66. GRB 991216 Optical Observations
  67. GRB 991216, optical observations
  68. GRB 991208 SAO-RAS Spectroscopy
  69. SAX J2303.2+0015: an x-ray/GRB?
  70. GRB 991216, Optical Transient
  71. GRB991216 ('Beethoven Burst') B, R, and K Observations
  72. GRB991216, infrared observations
  73. GRB 991208 optical observations
  74. GRB 991216 Optical Observation
  75. GRB 991208 Keck Spectroscopy
  76. GRB 991216: Extremely bright BATSE burst
  77. GRB991208, optical observations
  78. GRB 991208, Optical Observation
  79. GRB991208, optical observations
  80. IPN localization of GRB991208
  81. Optical Observations of GRB991105
  82. GRB991106: BeppoSAX/BATSE results
  83. GRB 991106, optical observations
  84. BeppoSAX NFI Observation of GRB991106
  85. GRB 991106, radio observations
  86. GRB991106: the first BeppoSAX short GRB detection?
  87. GRB 991105: BATSE Observations
  88. GRB 991106 Optical Observations
  89. GRB991106, optical observation at SAO-RAS
  90. GRB 991106, LOTIS Optical Observations
  91. GRB991105: SAX-GRBM/-WFC detection
  92. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  93. GRB 991014, Optical Observations
  94. GRB 991014 - BeppoSAX NFI observations
  95. GRB 991014, Optical Observations
  96. GRB 991014, radio observations
  97. GRB991014 BATSE Observations
  98. GRB 991014, Optical Observations
  99. GRB 991014, optical observations
  100. Super-LOTIS optical observation of GRB991014

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