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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"

23410 results found.

  1. GRB000313, Radio observations
  2. GRB 000313 - optical transient in the BATSE error box
  3. GRB 000307, BVRI Field Photometry
  4. GRB 000301C: HST/STIS CCD Imaging of the field
  5. IPN error box for GRB000307
  6. GRB000301C, optical R-band observations
  7. GRB 000301C Optical Observations
  8. GRB 000301C: K' Observations
  9. GRB000301C OT candidate optical observations
  10. GRB000301C - Host galaxy not detected in R (?)
  11. Optical observations of GRB000301c
  12. GRB000301C, Radio observations
  13. GRB000301C, Radio observations
  14. GRB 000301c near-IR observations
  15. GRB 000301C, Optical Color
  16. GRB 000301C, UBVRI field photometry
  17. GRB000301C, near-infrared observations (JHK' photometry)
  18. GRB 000301C: OT confirmed
  19. GRB000301c optical observations
  20. GRB000301c, near-infrared observations
  21. GRB000301C
  22. GRB 000301C : Optical Candidate
  23. GRB000301C: RXTE/ASM and IPN localizations
  24. GRB000301A [IPN Position]
  25. GRB000226 [IPN Position]
  26. HST Observations of GRB 990712
  27. GRB 000214 near-IR observations
  28. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  29. GRB000210, Radio Observations
  30. Correction to GCN 557 (GRB000214: BeppoSAX GRBM and WFC Detection)
  31. GRB 000115, BVRI field photometry
  32. GRB000214: BeppoSAX GRBM and WFC Detection
  33. IPN annulus for GRB000214
  34. BATSE GRB trigger criterion changed
  35. Optical observations of GRB000210
  36. GRB000210 X-ray afterglow
  37. GRB000214: X-ray afterglow candidate
  38. GRB000214 refined BeppoSAX-WFC position
  39. GRB 000210: BATSE Observations
  40. Optical observations of the Chandra X-ray source for GRB000210
  41. GRB000210, Radio Observations
  42. GRB000201, Radio Observations
  43. GRB000210: BeppoSAX GRBM and WFC Detection
  44. GRB000201 Optical Observations
  45. BATSE+IPN location of GRB000131
  46. IPN localization of GRB000131
  47. GRB 000126, optical observations
  48. IPN annulus for GRB000115
  49. GRB991216, UBVRIJHK field photometry
  50. GCN resumes full operations
  51. GRB 991216: Detection of the Host and/or Absorber Galaxy
  52. IPN error box for GRB991216
  53. GRB 991216: Updated BATSE parameters
  54. GRB 991217 (SAX J2303.2+0015) Optical observations
  55. Chandra observation of the X-ray afterglow of GRB991216
  56. SAX J2303.2+0015 Optical observations
  57. IR observations of GRB991216
  58. GRB 991217 (SAX J2303.2+0015) Optical observations
  59. Refined IPN localization of GRB991216
  60. GRB 991216 Radio Observations
  61. GRB 991208 Infrared Detection
  62. GRB991216
  63. GRB 991216--Summary of RXTE Observations
  64. GRB 991216 Optical Observations
  65. GRB 991216, optical observations
  66. GRB 991208 SAO-RAS Spectroscopy
  67. SAX J2303.2+0015: an x-ray/GRB?
  68. GRB 991216, Optical Transient
  69. GRB991216 ('Beethoven Burst') B, R, and K Observations
  70. GRB991216, infrared observations
  71. GRB 991208 optical observations
  72. GRB 991216 Optical Observation
  73. GRB 991216: Extremely bright BATSE burst
  74. GRB991208, optical observations
  75. GRB 991208, Optical Observation
  76. GRB991208, optical observations
  77. GRB 991208 Optical Decay
  78. Optical Observations of GRB991105
  79. GRB 991106, optical observations
  80. BeppoSAX NFI Observation of GRB991106
  81. GRB 991106, radio observations
  82. GRB991106: the first BeppoSAX short GRB detection?
  83. IPN localization of GRB991105
  84. GRB 991106 Optical Observations
  85. GRB991106, optical observation at SAO-RAS
  86. GRB 991106, LOTIS Optical Observations
  87. GRB991105: SAX-GRBM/-WFC detection
  88. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  89. GRB 991014, Optical Observations
  90. GRB 991014 - BeppoSAX NFI observations
  91. GRB 991014, radio observations
  92. GRB 991014, Optical Observations
  93. GRB 991014, optical observations
  94. IPN localization of GRB991014 - CORRECTION
  95. IPN localization of GRB991014
  96. Optical Observations of GRB990907
  97. IPN localization of BATSE #7766 (GRB990915)
  98. GRB990907: BeppoSAX follow up and X-ray afterglow
  99. GRB990907 and 990908
  100. IPN localization of GRB990907

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