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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"

27326 results found.

  1. GRB 000313 - optical transient in the BATSE error box
  2. GRB 000307, Optical Observations
  3. GRB 000307, BVRI Field Photometry
  4. GRB 000301C: A Precise Redshift Determination
  5. GRB 000301C, Optical Observation
  6. GRB 000301C: HST/STIS CCD Imaging of the field
  7. IPN error box for GRB000307
  8. GRB000301C, optical R-band observations
  9. GRB 000301C Optical Observations
  10. GRB 000301C: K' Observations
  11. GRB000301C OT candidate optical observations
  12. GRB000301C - Host galaxy not detected in R (?)
  13. Optical observations of GRB000301c
  14. GRB000301C, Radio observations
  15. GRB000301C, Radio observations
  16. GRB000301C, near-infrared observations (JHK' imaging)
  17. GRB 000301c near-IR observations
  18. GRB 000301C, UBVRI field photometry
  19. GRB 000301C: OT confirmed
  20. GRB000301c optical observations
  21. GRB000301C, optical observations
  22. GRB000301C
  23. GRB 000301C : Optical Candidate
  24. GRB000301C: RXTE/ASM and IPN localizations
  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. GRB 000115, BVRI field photometry
  31. GRB000214: BeppoSAX GRBM and WFC Detection
  32. Optical observations of GRB000210
  33. GRB000210 X-ray afterglow
  34. GRB000214: X-ray afterglow candidate
  35. GRB000214 refined BeppoSAX-WFC position
  36. GRB 000210: BATSE Observations
  37. Optical observations of the Chandra X-ray source for GRB000210
  38. GRB000210, Radio Observations
  39. IPN triangulation of GRB000210
  40. GRB000210: possible afterglow detection with BeppoSAX NFI
  41. GRB000201, Radio Observations
  42. GRB000210: BeppoSAX GRBM and WFC Detection
  43. SAX_WFC_GRB_NOTICE
  44. SAX_WFC_GRB_NOTICE
  45. GRB000201 Optical Observations
  46. GRB 000201: TAROT optical observations
  47. GRB 991208, radio observations
  48. BATSE+IPN location of GRB000131
  49. IPN localization of GRB000131
  50. GRB 000126, optical observations
  51. BATSE Observations of GRB000115
  52. Second RXTE Observation of GRB 000115
  53. GRB991216, UBVRIJHK field photometry
  54. GCN resumes full operations
  55. GRB 991216 VLBA Observations
  56. GRB 991216: J band spectrophotometry
  57. GRB 991216: Detection of the Host and/or Absorber Galaxy
  58. IPN localization of GRB991226
  59. GRB 991216 RXTE ASM Observations
  60. GRB 991216: Updated BATSE parameters
  61. GRB 991217 (SAX J2303.2+0015) Optical observations
  62. Chandra observation of the X-ray afterglow of GRB991216
  63. GRB 991216, optical observations
  64. GRB 991216 Optical spectroscopy/imaging
  65. SAX J2303.2+0015 Optical observations
  66. IR observations of GRB991216
  67. GRB 991217 (SAX J2303.2+0015) Optical observations
  68. GRB991216 Optical and infrared observations of Beethoven Burst
  69. GRB 991216 Radio Observations
  70. GRB 991208 Keck Spectroscopy
  71. GRB 991208 Infrared Detection
  72. GRB991216
  73. GRB 991216--Summary of RXTE Observations
  74. GRB 991216 Optical Observations
  75. GRB 991216, optical observations
  76. GRB 991208 SAO-RAS Spectroscopy
  77. SAX J2303.2+0015: an x-ray/GRB?
  78. GRB 991216, Optical Transient
  79. GRB991216 ('Beethoven Burst') B, R, and K Observations
  80. GRB991216, infrared observations
  81. GRB 991208 optical observations
  82. GRB 991216 Optical Observation
  83. GRB 991216: Extremely bright BATSE burst
  84. R-band Observations of GRB991208 at TNG
  85. GRB991208, optical observations
  86. GRB 991208, Optical Observation
  87. GRB991208, optical observations
  88. GRB 991208 optical observations
  89. Optical Observations of GRB991105
  90. GRB991106: BeppoSAX/BATSE results
  91. GRB991106, near-infrared observations
  92. BeppoSAX NFI Observation of GRB991106
  93. GRB 991106, radio observations
  94. GRB991106: the first BeppoSAX short GRB detection?
  95. GRB 991105: BATSE Observations
  96. GRB 991106 Optical Observations
  97. GRB991106, optical observation at SAO-RAS
  98. GRB 991106, LOTIS Optical Observations
  99. GRB991105: SAX-GRBM/-WFC detection
  100. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI

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