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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"

11750 results found.

  1. Possible InfraRed Transient of GRB 010214.
  2. GRB010214 Optical Observation
  3. GRB 010214, optical observations
  4. HETE Status
  5. GRB010126 opt. obs.
  6. IPN/RXTE TRIANGULATION OF GRB010126
  7. GRB010126 optical observations
  8. IPN/RXTE TRIANGULATION OF GRB010126
  9. IPN TRIANGULATION OF GRB010115
  10. IPN triangulation of GRB001219
  11. GRB 001212 optical observation
  12. IPN triangulation of GRB001120
  13. GRB 001109 X-ray afterglow with BeppoSAX
  14. GRB001109: Optical observations
  15. GRB001109: BeppoSAX/NFI Observations
  16. XMM-Newton observation of GRB001025
  17. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  18. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  19. ASM Localization of GRB 001025
  20. GRB001018, Gamma Ray Observations
  21. IPN TRIANGULATION OF GRB001019
  22. GRB 000926 Chandra Observation
  23. IPN triangulation of GRB 001004
  24. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  25. GRB000926 K'-band Observation
  26. IPN triangulation of GRB000925
  27. IPN triangulation of GRB000910
  28. IPN triangulation of GRB000830
  29. HST/STIS observations of the host galaxy of GRB 980329
  30. SGR 1806-20 burst activity
  31. GRB000801 & GRB000730, Gamma Ray Observations
  32. GRB000730, Gamma Ray Observations
  33. GRB000801, Gamma Ray Observations
  34. possible optical counterpart of GRB 000630
  35. IPN triangulation of GRB000630
  36. GRB 000623, optical observations
  37. GRB000620, optical observations
  38. GRB000620: BeppoSAX WFC and GRBM detection
  39. BeppoSAX ALERT: GRB000620
  40. GRB000620: BeppoSAX Alert
  41. GRB000616 [IPN Position]
  42. GRB000615B [IPN Position]
  43. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  44. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  45. GRB000519: Optical observations
  46. IPN triangulation of GRB000516
  47. GRB 000429, optical observation
  48. GRB 000418, UBVRI field photometry
  49. GRB 000418, Optical Observation
  50. GRB 000418, optical observation
  51. GRB 000418, Optical Observation
  52. GRB 000418, Optical Observation
  53. GRB000418, near-infrared observations
  54. IPN error box for GRB000418
  55. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  56. GRB 000408, optical observations
  57. GRB000313, Radio observations
  58. GRB000301C - B and R photometry
  59. GRB 000307, BVRI Field Photometry
  60. IPN error box for GRB000307
  61. GRB 000301C, UBVRI field photometry
  62. GRB 000301C, Optical Observation
  63. GRB 000301A, Radio Observations
  64. GRB 000301C : Optical Candidate
  65. GRB000226 [IPN Position]
  66. GRB 000115 Optical observations
  67. BATSE GRB trigger criterion changed
  68. GRB 000210: BATSE Observations
  69. GRB000210: BeppoSAX GRBM and WFC Detection
  70. GRB000201 Optical Observations
  71. BATSE Observations of GRB000115
  72. GCN resumes full operations
  73. Chandra observation of the X-ray afterglow of GRB991216
  74. GRB 991216 Optical spectroscopy/imaging
  75. GRB 991216 Optical Observation
  76. GRB 991216: Extremely bright BATSE burst
  77. IPN localization of GRB991208
  78. GRB 991105: BATSE Observations
  79. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  80. GRB 990915 optical observations
  81. BATSE GRB trigger criteria
  82. GRB990907: BeppoSAX follow up and X-ray afterglow
  83. GRB990806: BATSE Observations
  84. GRB 990705, R-band observations
  85. Infrared and Optical Observations of GRB990705
  86. GRB990704
  87. Refined BeppoSAX-WFC position of GRB990704
  88. GRB990704: BeppoSAX detection
  89. IPN error box for GRB990527
  90. Late Afterglows of GRBs 990510, 990123
  91. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  92. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  93. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  94. BeppoSAX: A new fast X-ray transient
  95. VLT spectrum of GRB990510
  96. GRB 990510: BATSE Observations
  97. GRB990510
  98. GRB 990506: BATSE Observations
  99. GRB 990506, optical observations
  100. GRB990506 Optical observations

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