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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"

42581 results found.

  1. GRB 000307 optical observations
  2. GRB000323 [IPN Position]
  3. GRB000315 [IPN Positions]
  4. GRB000313, Radio observations
  5. GRB 000313 - optical transient in the BATSE error box
  6. GRB000301C - B and R photometry
  7. GRB000301C - R photometry
  8. GRB 000307, BVRI Field Photometry
  9. GRB 000301C: Optical Spectrum and Redshift
  10. GRB 000301C: Optical Spectrum and Redshift
  11. GRB 000301C: A Precise Redshift Determination
  12. GRB 000301C, Optical Observation
  13. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  14. GRB 000301C: HST/STIS CCD Imaging of the field
  15. IPN error box for GRB000307
  16. GRB 000301c: K' observations
  17. GRB000301C, optical R-band observations
  18. GRB000301c - R photometry and nearby faint source confirmation
  19. GRB 000301C, Optical Observation
  20. GRB 000301c: K' observations
  21. GRB 000301C Optical Observations
  22. GRB 000301C: K' Observations
  23. GRB000301C OT candidate optical observations
  24. GRB000301C - Host galaxy not detected in R (?)
  25. Optical observations of GRB000301c
  26. GRB000301C, Radio observations
  27. GRB000301C, Radio observations
  28. GRB000301C optical observations
  29. GRB000301C, near-infrared observations (JHK' imaging)
  30. GRB 000301c near-IR observations
  31. GRB 000301C, Optical Color
  32. GRB000301C, Optical Spectroscopy
  33. GRB 000301C, UBVRI field photometry
  34. GRB 000301C, Optical Observation
  35. GRB000301C, optical observations
  36. GRB000301C 250 GHz detection
  37. GRB 000301C R-band observation
  38. GRB 000301C, Optical Observation
  39. GRB000301C, near-infrared observations (JHK' photometry)
  40. GRB 000301C: OT confirmed
  41. GRB000301c optical observations
  42. GRB 000301A, Radio Observations
  43. GRB000301C, optical observations
  44. GRB000301c, near-infrared observations
  45. GRB000301C
  46. GRB 000301C : Optical Candidate
  47. Radio observations of the error box of GRB000301A
  48. GRB000301C: RXTE/ASM and IPN localizations
  49. GRB000226 [IPN Position]
  50. HST Observations of GRB 990712
  51. GRB 000214 near-IR observations
  52. GRB 000115 Optical observations
  53. GRB 000214, Radio Observations
  54. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  55. GRB000210, Radio Observations
  56. GRB 000115, BVRI field photometry
  57. GRB000214: BeppoSAX GRBM and WFC Detection
  58. IPN annulus for GRB000214
  59. Optical observations of GRB000210
  60. GRB000210 X-ray afterglow
  61. GRB000214: X-ray afterglow candidate
  62. GRB000214 refined BeppoSAX-WFC position
  63. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  64. GRB 000210: BATSE Observations
  65. Correction to Chandra Position of GRB000210 afterglow
  66. Optical observations of the Chandra X-ray source for GRB000210
  67. GRB000210, Radio Observations
  68. Optical candidate for GRB000210
  69. Chandra Observations of GRB000210 X-ray Afterglow
  70. IPN triangulation of GRB000210
  71. GRB000210: possible afterglow detection with BeppoSAX NFI
  72. GRB000201, Radio Observations
  73. GRB000210: BeppoSAX GRBM and WFC Detection
  74. Optical observations of GRB000131
  75. GRB000201 Optical Observations
  76. GRB 000201: TAROT optical observations
  77. GRB 000131 Optical Observations
  78. GRB000126 Optical Observations
  79. BATSE GRB trigger criteria changed
  80. GRB 991208, radio observations
  81. BATSE+IPN location of GRB000131
  82. IPN localization of GRB000131
  83. GRB000126, optical observations
  84. BATSE location of GRB000126
  85. IPN localization of GRB000126
  86. GRB 000115 Optical observations
  87. BATSE Observations of GRB000115
  88. Correction to GCN 520 (IPN annulus for GRB000115)
  89. IPN annulus for GRB000115
  90. Second RXTE Observation of GRB 000115
  91. GRB991216, UBVRIJHK field photometry
  92. GRB991216 late optical observation
  93. GCN resumes full operations
  94. GRB 991216 VLBA Observations
  95. BEPPOSAX GRBM Localization of GRB991226
  96. IPN error boxes for GRB991229
  97. GRB 991216: J band spectrophotometry
  98. GRB 991216: Detection of the Host and/or Absorber Galaxy
  99. IPN localization of GRB991226
  100. IPN error boxes for GRB991221

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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