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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"

35945 results found.

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

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