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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"

20480 results found.

  1. GRB 000301C: HST/STIS CCD Imaging of the field
  2. GRB 000301c: K' observations
  3. GRB000301C, optical R-band observations
  4. GRB000301c - R photometry and nearby faint source confirmation
  5. GRB 000301C, Optical Observation
  6. GRB 000301c: K' observations
  7. GRB 000301C Optical Observations
  8. GRB 000301C: K' Observations
  9. GRB000301C OT candidate optical observations
  10. GRB000301C - Host galaxy not detected in R (?)
  11. Optical observations of GRB000301c
  12. GRB000301C, Radio observations
  13. GRB000301C, Radio observations
  14. GRB000301C optical observations
  15. GRB000301C, near-infrared observations (JHK' imaging)
  16. GRB 000301c near-IR observations
  17. GRB000301C, optical observations
  18. GRB000301C, near-infrared observations (JHK' photometry)
  19. GRB000301c optical observations
  20. GRB 000301A, Radio Observations
  21. GRB000301C, optical observations
  22. GRB000301c, near-infrared observations
  23. Radio observations of the error box of GRB000301A
  24. HST Observations of GRB 990712
  25. GRB 000214 near-IR observations
  26. GRB 000115 Optical observations
  27. GRB 000214, Radio Observations
  28. GRB000210, Radio Observations
  29. Optical observations of GRB000210
  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. GRB000201, Radio Observations
  36. Optical observations of GRB000131
  37. GRB000201 Optical Observations
  38. GRB 000201: TAROT optical observations
  39. GRB 000131 Optical Observations
  40. GRB000126 Optical Observations
  41. GRB 991208, radio observations
  42. GRB 000126, optical observations
  43. GRB000126, optical observations
  44. GRB 000115 Optical observations
  45. BATSE Observations of GRB000115
  46. GRB991216, UBVRIJHK field photometry
  47. GRB991216 late optical observation
  48. GRB 991216 VLBA Observations
  49. IPN error boxes for GRB991229
  50. GRB 991216: J band spectrophotometry
  51. GRB 991216 RXTE ASM Observations
  52. Lowell/Perkins observation of GRB 991216
  53. GRB 991217 (SAX J2303.2+0015) Optical observations
  54. GRB991217/SAX J2303.2+0015, optical observations
  55. GRB 991216, optical observations
  56. GRB 991216 Optical Observations
  57. GRB991216 Optical and IR observations
  58. K observations of GRB991216
  59. SAX J2303.2+0015 Optical observations
  60. IR observations of GRB991216
  61. GRB991216 radio observations
  62. GRB 991217 (SAX J2303.2+0015) Optical observations
  63. GRB991216 radio observations
  64. GRB991216, optical observations
  65. GRB991216 Optical and infrared observations of Beethoven Burst
  66. GRB 991216 Radio Observations
  67. GRB 991208 Keck Spectroscopy
  68. GRB 991216--Summary of RXTE Observations
  69. GRB 991216 Optical Observations
  70. GRB 991216, optical observations
  71. GRB 991216, Optical Transient
  72. GRB 991216, Optical Afterglow
  73. GRB991216 ('Beethoven Burst') B, R, and K Observations
  74. GRB991216, infrared observations
  75. GRB991216 Optical Observations
  76. GRB 991208 optical observations
  77. GRB 991208 Keck Spectroscopy
  78. GRB 991216: Extremely bright BATSE burst
  79. R-band Observations of GRB991208 at TNG
  80. GRB991208, optical observations
  81. GRB 991208 Keck Spectroscopy
  82. GRB991208 15-GHz observations
  83. GRB991208, optical observations
  84. GRB 991208 - OVRO detection
  85. GRB 991208 optical observations
  86. GRB 991208 optical observations
  87. GRB 991208: Radio Observations
  88. Optical Observations of GRB991105
  89. GRB991106: BeppoSAX/BATSE results
  90. GRB 991106, optical observations
  91. GRB991106, near-infrared observations
  92. GRB 991106, radio observations
  93. GRB 991105: BATSE Observations
  94. GRB 991106 Optical Observations
  95. GRB 991105, optical observations
  96. GRB 991106, LOTIS Optical Observations
  97. GRB 991106, optical observations
  98. GRB 991014, Optical Observations
  99. GRB 991014 - BeppoSAX NFI observations
  100. GRB 991014, Optical Observations

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