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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"

23093 results found.

  1. GRB 000210: BATSE Observations
  2. Optical observations of the Chandra X-ray source for GRB000210
  3. Optical candidate for GRB000210
  4. IPN triangulation of GRB000210
  5. GRB000210: BeppoSAX GRBM and WFC Detection
  6. GRB 000201: TAROT optical observations
  7. GRB 000131 Optical Observations
  8. GRB 991208, radio observations
  9. BATSE+IPN location of GRB000131
  10. IPN localization of GRB000131
  11. GRB 000126, optical observations
  12. BATSE location of GRB000126
  13. IPN localization of GRB000126
  14. GRB 000115 Optical observations
  15. BATSE Observations of GRB000115
  16. IPN annulus for GRB000115
  17. GRB991216, UBVRIJHK field photometry
  18. GRB991216 late optical observation
  19. Single IPN error box for GRB991229
  20. BEPPOSAX GRBM Localization of GRB991226
  21. IPN error boxes for GRB991229
  22. IPN localization of GRB991226
  23. Single IPN error box for GRB991221
  24. IPN error boxes for GRB991221
  25. IPN error box for GRB991216
  26. GRB 991216: Updated BATSE parameters
  27. Chandra observation of the X-ray afterglow of GRB991216
  28. GRB 991216, optical observations
  29. GRB 991216 Optical spectroscopy/imaging
  30. GRB991216 Optical and IR observations
  31. SAX J2303.2+0015 Optical observations
  32. GRB991216 radio observations
  33. GRB 991217 (SAX J2303.2+0015) Optical observations
  34. GRB991216 Spectroscopy
  35. Refined IPN localization of GRB991216
  36. GRB 991208 Infrared Detection
  37. GRB 991216, optical observations
  38. GRB 991208 SAO-RAS Spectroscopy
  39. GRB 991216, Optical Transient
  40. GRB991216, infrared observations
  41. GRB 991208 Keck Spectroscopy
  42. GRB 991216: Extremely bright BATSE burst
  43. R-band Observations of GRB991208 at TNG
  44. GRB991208, optical observations
  45. GRB 991208 Keck Spectroscopy
  46. GRB991208 - millimeter detection
  47. GRB 991208 Optical Decay
  48. GRB 991208 optical observations
  49. IPN localization of GRB991208
  50. GRB991106: BeppoSAX/BATSE results
  51. GRB 991106, optical observations
  52. GRB991106, near-infrared observations
  53. BeppoSAX NFI Observation of GRB991106
  54. GRB 991105: BATSE Observations
  55. IPN localization of GRB991105
  56. GRB 991106 Optical Observations
  57. GRB 991105, optical observations
  58. GRB 991106, LOTIS Optical Observations
  59. GRB 991106, optical observations
  60. BeppoSAX GRB Alert: GRB991106
  61. GRB991105: SAX-GRBM/-WFC detection
  62. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  63. GRB 991014, Optical Observations
  64. GRB 991014 - BeppoSAX NFI observations
  65. GRB 991014, Optical Observations
  66. GRB991014 BATSE Observations
  67. GRB 991014, Optical Observations
  68. GRB 991014, optical observations
  69. Super-LOTIS optical observation of GRB991014
  70. IPN/NFI error box for GRB991014
  71. IPN localization of GRB991014 - CORRECTION
  72. IPN localization of GRB991014
  73. BeppoSAX ALERT: GRB991014
  74. GRB 990915 optical observations
  75. GRB 990907 optical observations
  76. Optical Observations of GRB990907
  77. IPN error box for GRB990915 (=BATSE 7766)
  78. GRB990907: BeppoSAX follow up and X-ray afterglow
  79. IPN localization of GRB990907
  80. GRB990907: refined WFC position
  81. GRB 990712 Late Optical Decay and Host Galaxy
  82. GRB990806 BeppoSAX follow up
  83. GRB990806: BATSE Observations
  84. Optical Observations of GRB990806
  85. GRB 990806, optical observations
  86. GRB990806 UBVRIJHK observations
  87. BeppoSAX ALERT GRB990806: Summer GRB
  88. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  89. GRB 990705, R-band observations
  90. Updated IPN localization of GRB990705
  91. IPN localization of GRB990704
  92. IPN localization of GRB990705
  93. Infrared and Optical Observations of GRB990705
  94. GRB990704: SAX-NFI results summary
  95. GRB 990704 Optical Observations
  96. GRB 990704, optical observations
  97. GRB990705: Intriguing Positional Coincidences
  98. GRB990704, optical observations
  99. GRB990704
  100. BeppoSAX NFI Observation of GRB990627 X-ray afterglow

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