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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"

35254 results found.

  1. GRB 991014 - BeppoSAX NFI observations
  2. GRB 991014, Optical Observations
  3. GRB 991014, radio observations
  4. GRB991014 BATSE Observations
  5. GRB 991014, Optical Observations
  6. GRB 991014, optical observations
  7. Super-LOTIS optical observation of GRB991014
  8. IPN/NFI error box for GRB991014
  9. IPN localization of GRB991014 - CORRECTION
  10. IPN localization of GRB991014
  11. BeppoSAX ALERT: GRB991014
  12. GRB 990915 optical observations
  13. GRB 990907 optical observations
  14. BATSE GRB trigger criteria
  15. Optical Observations of GRB990907
  16. IPN error box for GRB990915 (=BATSE 7766)
  17. IPN localization of BATSE #7766 (GRB990915)
  18. IPN localization of GRB990907
  19. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  20. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  21. GRB 990712 Late Optical Decay and Host Galaxy
  22. GRB 990712, Optical Observation
  23. GRB990806: BATSE Observations
  24. GRB 990806 Optical observations
  25. Optical Observations of GRB990806
  26. GRB 990806, Optical Observations
  27. GRB 990806, optical observations
  28. GRB 990806, Optical Observations
  29. GRB990806 UBVRIJHK observations
  30. BeppoSAX ALERT GRB990806: Summer GRB
  31. GRB 990712 Optical Observations
  32. GRB990705: No Evidence for Neutrino Signal
  33. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  34. VLT spectrum of GRB990712
  35. GRB 990712
  36. Late-time HST/STIS Observations of GRB 990510
  37. Refined BeppoSAX-WFC position of GRB990712
  38. GRB 990705, R-band observations
  39. Updated IPN localization of GRB990705
  40. IPN localization of GRB990704
  41. IPN localization of GRB990705
  42. Infrared and Optical Observations of GRB990705
  43. GRB 990705, radio observations
  44. GRB990704 radio and optical observations
  45. GRB 990704 X-ray Observations
  46. GRB 990704 Optical Observations
  47. GRB 990704, optical observations
  48. GRB990704
  49. GRB990705: Intriguing Positional Coincidences
  50. GRB990704
  51. GRB990704, optical observations
  52. Identification of a possible optical counterpart for GRB990704
  53. GRB990704
  54. Refined BeppoSAX-WFC position of GRB990704
  55. GRB990704: BeppoSAX detection
  56. Optical Observations of GRB990627
  57. GRB 990627, radio observations
  58. GRB990627: BeppoSAX-WFC final location
  59. BeppoSAX: GRB990625
  60. Late-time HST/STIS Observation of GRB 990123
  61. GRB 990506 - clarification to GCN 352
  62. GRB 990506 - Optical Observations
  63. Optical Observations of GRB 990506
  64. GRB 990506 Radio Transient
  65. GRB990527 Optical Observations
  66. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  67. IPN error box for GRB990527
  68. Late Afterglows of GRBs 990510, 990123
  69. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  70. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  71. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  72. GRB 990506 optical observation
  73. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  74. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  75. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  76. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  77. radio observations of X-ray/GRB transient field
  78. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  79. Optical report on X-ray/GRB transient
  80. radio detection of X-ray/GRB transient
  81. BeppoSAX: A new fast X-ray transient
  82. GRB 990510: optical observations
  83. GRB990510: photometric and spectroscopic observations with the VLT
  84. GRB 990510: optical linear polarization
  85. GRB 990510: optical observations
  86. GRB990510, VI observations
  87. GRB 990506 R band observations
  88. GRB990510: X-ray afterglow
  89. GRB 990510: optical observation
  90. VLT spectrum of GRB990510
  91. GRB 990510: Broad Band Break
  92. GRB 990510: BATSE Observations
  93. GRB 990510 Optical Observations
  94. GRB 990510, BVI photometry
  95. GRB 990510 optical observations
  96. GRB 990510: BeppoSAX/GRBM observations
  97. GRB990510 optical observations
  98. GRB 990510 optical observations
  99. GRB 990510 optical observations
  100. Galactic extinction towards GRB 990510

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