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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"

11468 results found.

  1. IPN triangulation of GRB010629
  2. GRB010629: A Burst Localized by HETE
  3. SGR1900+14: Second Burst Localized by HETE
  4. Possible burst from SGR1806-20
  5. SGR1806-20: A Second, Intense Burst Localized by HETE
  6. SGR1806-20: Localization by HETE
  7. X-ray precursors to the large flare from SGR 1900+14
  8. GRB010427, Gamma Ray Observations
  9. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  10. SGR 1900+14, Chandra observations
  11. GRB010326: Localization by HETE
  12. GRB010214, field photometry
  13. GRB010222, field photometry
  14. GRB010214B,Gamma Ray Observations
  15. BeppoSAX ALERT: GRB010220
  16. GRB010214: BeppoSAX WFC and GRBM preliminary data
  17. GRB 010214, Optical Observations
  18. J-Band Observation of GRB 010214.
  19. Possible InfraRed Transient of GRB 010214.
  20. GRB010214 Optical Observation
  21. GRB 010214, optical observations
  22. HETE Status
  23. GRB010126 opt. obs.
  24. IPN/RXTE TRIANGULATION OF GRB010126
  25. GRB010126 optical observations
  26. IPN/RXTE TRIANGULATION OF GRB010126
  27. IPN TRIANGULATION OF GRB010115
  28. IPN triangulation of GRB001219
  29. GRB 001212 optical observation
  30. IPN triangulation of GRB001120
  31. GRB 001109 X-ray afterglow with BeppoSAX
  32. GRB001109: Optical observations
  33. GRB001109: BeppoSAX/NFI Observations
  34. XMM-Newton observation of GRB001025
  35. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  36. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  37. ASM Localization of GRB 001025
  38. GRB001018, Gamma Ray Observations
  39. IPN TRIANGULATION OF GRB001019
  40. GRB 000926 Chandra Observation
  41. IPN triangulation of GRB 001004
  42. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  43. GRB000926 K'-band Observation
  44. IPN triangulation of GRB000925
  45. IPN triangulation of GRB000910
  46. IPN triangulation of GRB000830
  47. HST/STIS observations of the host galaxy of GRB 980329
  48. SGR 1806-20 burst activity
  49. GRB000801 & GRB000730, Gamma Ray Observations
  50. GRB000730, Gamma Ray Observations
  51. GRB000801, Gamma Ray Observations
  52. possible optical counterpart of GRB 000630
  53. IPN triangulation of GRB000630
  54. GRB 000623, optical observations
  55. GRB000620, optical observations
  56. GRB000620: BeppoSAX WFC and GRBM detection
  57. BeppoSAX ALERT: GRB000620
  58. GRB000620: BeppoSAX Alert
  59. GRB000616 [IPN Position]
  60. GRB000615B [IPN Position]
  61. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  62. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  63. GRB000519: Optical observations
  64. IPN triangulation of GRB000516
  65. GRB 000429, optical observation
  66. GRB 000418, UBVRI field photometry
  67. GRB 000418, Optical Observation
  68. GRB 000418, optical observation
  69. GRB 000418, Optical Observation
  70. GRB 000418, Optical Observation
  71. GRB000418, near-infrared observations
  72. IPN error box for GRB000418
  73. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  74. GRB 000408, optical observations
  75. GRB000313, Radio observations
  76. GRB000301C - B and R photometry
  77. GRB 000307, BVRI Field Photometry
  78. IPN error box for GRB000307
  79. GRB 000301C, UBVRI field photometry
  80. GRB 000301C, Optical Observation
  81. GRB 000301A, Radio Observations
  82. GRB 000301C : Optical Candidate
  83. GRB000226 [IPN Position]
  84. GRB 000115 Optical observations
  85. BATSE GRB trigger criterion changed
  86. GRB 000210: BATSE Observations
  87. GRB000210: BeppoSAX GRBM and WFC Detection
  88. GRB000201 Optical Observations
  89. BATSE Observations of GRB000115
  90. GCN resumes full operations
  91. Chandra observation of the X-ray afterglow of GRB991216
  92. GRB 991216 Optical spectroscopy/imaging
  93. GRB 991216 Optical Observation
  94. GRB 991216: Extremely bright BATSE burst
  95. IPN localization of GRB991208
  96. GRB 991105: BATSE Observations
  97. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  98. GRB 990915 optical observations
  99. BATSE GRB trigger criteria
  100. GRB990907: BeppoSAX follow up and X-ray afterglow

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