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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"

21575 results found.

  1. GRB 000131 Optical Observations
  2. GRB000126 Optical Observations
  3. GRB 991208, radio observations
  4. BATSE+IPN location of GRB000131
  5. IPN localization of GRB000131
  6. GRB 000126, optical observations
  7. GRB000126, optical observations
  8. IPN localization of GRB000126
  9. GRB 000115 Optical observations
  10. BATSE Observations of GRB000115
  11. IPN annulus for GRB000115
  12. GRB991216, UBVRIJHK field photometry
  13. GRB991216 late optical observation
  14. Single IPN error box for GRB991229
  15. GRB 991216 VLBA Observations
  16. BEPPOSAX GRBM Localization of GRB991226
  17. IPN error boxes for GRB991229
  18. GRB 991216: J band spectrophotometry
  19. IPN localization of GRB991226
  20. Single IPN error box for GRB991221
  21. IPN error boxes for GRB991221
  22. GRB 991216 RXTE ASM Observations
  23. IPN error box for GRB991216
  24. Lowell/Perkins observation of GRB 991216
  25. GRB 991217 (SAX J2303.2+0015) Optical observations
  26. GRB991217/SAX J2303.2+0015, optical observations
  27. GRB 991216, optical observations
  28. GRB 991216 Optical Observations
  29. GRB991216 Optical and IR observations
  30. K observations of GRB991216
  31. SAX J2303.2+0015 Optical observations
  32. IR observations of GRB991216
  33. GRB991216 radio observations
  34. GRB 991217 (SAX J2303.2+0015) Optical observations
  35. GRB991216 radio observations
  36. GRB991216, optical observations
  37. GRB991216 Optical and infrared observations of Beethoven Burst
  38. GRB 991216 Radio Observations
  39. GRB 991208 Keck Spectroscopy
  40. GRB 991208 Infrared Detection
  41. GRB991216
  42. GRB 991216--Summary of RXTE Observations
  43. GRB 991216 Optical Observations
  44. GRB 991216, optical observations
  45. GRB 991216, Optical Transient
  46. GRB 991216, Optical Afterglow
  47. GRB991216 ('Beethoven Burst') B, R, and K Observations
  48. GRB991216, infrared observations
  49. GRB991216 Optical Observations
  50. GRB 991208 optical observations
  51. GRB 991208 Keck Spectroscopy
  52. GRB 991216: Extremely bright BATSE burst
  53. R-band Observations of GRB991208 at TNG
  54. GRB991208, optical observations
  55. GRB 991208 Keck Spectroscopy
  56. GRB991208 15-GHz observations
  57. GRB991208, optical observations
  58. GRB 991208 - OVRO detection
  59. GRB 991208 optical observations
  60. GRB 991208 optical observations
  61. GRB 991208: Radio Observations
  62. IPN localization of GRB991208
  63. Optical Observations of GRB991105
  64. GRB991106: BeppoSAX/BATSE results
  65. GRB 991106, optical observations
  66. GRB991106, near-infrared observations
  67. GRB 991106, radio observations
  68. GRB 991105: BATSE Observations
  69. IPN localization of GRB991105
  70. GRB 991106 Optical Observations
  71. GRB 991105, optical observations
  72. GRB 991106, LOTIS Optical Observations
  73. GRB 991106, optical observations
  74. GRB 991014, Optical Observations
  75. GRB 991014 - BeppoSAX NFI observations
  76. GRB 991014, Optical Observations
  77. GRB 991014, radio observations
  78. GRB991014 BATSE Observations
  79. GRB 991014, Optical Observations
  80. GRB 991014, optical observations
  81. GRB 990915 optical observations
  82. GRB 990907 optical observations
  83. Optical Observations of GRB990907
  84. IPN error box for GRB990915 (=BATSE 7766)
  85. GRB990907 and 990908
  86. GRB 990712 Late Optical Decay and Host Galaxy
  87. GRB 990712, Optical Observation
  88. GRB990806: BATSE Observations
  89. GRB 990806 Optical observations
  90. Optical Observations of GRB990806
  91. GRB 990806, Optical Observations
  92. GRB 990806, optical observations
  93. GRB 990806, Optical Observations
  94. GRB990806 UBVRIJHK observations
  95. GRB 990712 Optical Observations
  96. GRB 990712
  97. Late-time HST/STIS Observations of GRB 990510
  98. GRB 990705, R-band observations
  99. Updated IPN localization of GRB990705
  100. Infrared and Optical Observations of GRB990705

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