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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"

35341 results found.

  1. BATSE GRB trigger criteria
  2. Optical Observations of GRB990907
  3. IPN error box for GRB990915 (=BATSE 7766)
  4. IPN localization of BATSE #7766 (GRB990915)
  5. IPN localization of GRB990907
  6. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  7. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  8. GRB 990712 Late Optical Decay and Host Galaxy
  9. GRB 990712, Optical Observation
  10. GRB990806: BATSE Observations
  11. GRB 990806 Optical observations
  12. Optical Observations of GRB990806
  13. GRB 990806, Optical Observations
  14. GRB 990806, optical observations
  15. GRB 990806, Optical Observations
  16. GRB990806 UBVRIJHK observations
  17. BeppoSAX ALERT GRB990806: Summer GRB
  18. GRB 990712 Optical Observations
  19. GRB990705: No Evidence for Neutrino Signal
  20. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  21. VLT spectrum of GRB990712
  22. GRB 990712
  23. Late-time HST/STIS Observations of GRB 990510
  24. Refined BeppoSAX-WFC position of GRB990712
  25. GRB 990705, R-band observations
  26. Updated IPN localization of GRB990705
  27. IPN localization of GRB990704
  28. IPN localization of GRB990705
  29. Infrared and Optical Observations of GRB990705
  30. GRB 990705, radio observations
  31. GRB990704 radio and optical observations
  32. GRB 990704 X-ray Observations
  33. GRB 990704 Optical Observations
  34. GRB 990704, optical observations
  35. GRB990704
  36. GRB990705: Intriguing Positional Coincidences
  37. GRB990704
  38. GRB990704, optical observations
  39. Identification of a possible optical counterpart for GRB990704
  40. GRB990704
  41. Refined BeppoSAX-WFC position of GRB990704
  42. GRB990704: BeppoSAX detection
  43. Optical Observations of GRB990627
  44. GRB 990627, radio observations
  45. GRB990627: BeppoSAX-WFC final location
  46. BeppoSAX: GRB990625
  47. Late-time HST/STIS Observation of GRB 990123
  48. GRB 990506 - clarification to GCN 352
  49. GRB 990506 - Optical Observations
  50. Optical Observations of GRB 990506
  51. GRB 990506 Radio Transient
  52. GRB990527 Optical Observations
  53. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  54. IPN error box for GRB990527
  55. Late Afterglows of GRBs 990510, 990123
  56. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  57. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  58. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  59. GRB 990506 optical observation
  60. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  61. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  62. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  63. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  64. radio observations of X-ray/GRB transient field
  65. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  66. Optical report on X-ray/GRB transient
  67. radio detection of X-ray/GRB transient
  68. BeppoSAX: A new fast X-ray transient
  69. GRB 990510: optical observations
  70. GRB990510: photometric and spectroscopic observations with the VLT
  71. GRB 990510: optical linear polarization
  72. GRB 990510: optical observations
  73. GRB990510, VI observations
  74. GRB 990506 R band observations
  75. GRB990510: X-ray afterglow
  76. GRB 990510: optical observation
  77. VLT spectrum of GRB990510
  78. GRB 990510: Broad Band Break
  79. GRB 990510: BATSE Observations
  80. GRB 990510 Optical Observations
  81. GRB 990510, BVI photometry
  82. GRB 990510 optical observations
  83. GRB 990510: BeppoSAX/GRBM observations
  84. GRB990510 optical observations
  85. GRB 990510 optical observations
  86. GRB 990510 optical observations
  87. Galactic extinction towards GRB 990510
  88. GRB 990510 optical observations
  89. IPN localization of GRB990510
  90. GRB 990506 Radio Observations
  91. GRB 990123, optical monitoring
  92. GRB 990506: BATSE Observations
  93. GRB 990506, optical observations
  94. GRB 990510: Final BeppoSAX-WFC Coordinates
  95. GRB 990506, Optical Observations
  96. GRB 990506 optical observations
  97. GRB 990506 optical observations
  98. GRB 990506, optical observations
  99. GRB990506 observation plan
  100. Refined IPN error box for GRB990506

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