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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"

35946 results found.

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

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