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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"

45486 results found.

  1. GRB000604 optical non-detection
  2. GRB000604 - Optical observations
  3. GRB000607, A SHORT, HARD BURST
  4. GRB000604, optical observations
  5. GRB000528, optical observations at ESO
  6. GRB 000604 optical observations
  7. GRB 000418: Detection of the Host Galaxy
  8. GRB000604, optical observations, comparison with DPOSS
  9. GRB000604 [IPN Position]
  10. GRB000528, Radio Observations
  11. X-ray Afterglow of GRB 000529
  12. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  13. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  14. GRB000529: Optical Observations
  15. IPN localization and time history of GRB000528
  16. New IPN localization of GRB000529
  17. GRB000519: Optical observations
  18. IPN localization of GRB000529
  19. GRB 000528 - WFC measurements
  20. GRB000529: BeppoSAX WFC position
  21. GRB000528: BeppoSAX GRBM observations
  22. GRB 000528 Optical Observations
  23. GRB000519, BVRI field photometry
  24. IPN triangulation of GRB000519
  25. IPN triangulation of GRB000516
  26. Re: GRB000508B : Optical observations
  27. GRB 000418, Optical observation
  28. GRB000508B, optical photometry
  29. GRB000508B, BVR field photometry
  30. Possible GRB-related phenomenon
  31. RXTE/ASM and IPN localization of GRB 000508B
  32. GRB000424, UBVRI field photometry
  33. GRB 000424 Optical Observations
  34. GRB000418, UBVRI field photometry update
  35. The redshift of GRB 000418
  36. GRB000424, optical observations
  37. GRB 000429, optical observation
  38. GRB 000429, UBVRI field photometry
  39. IPN localization of GRB000429
  40. GRB 000418, UBVRI field photometry
  41. GRB000418, Radio detection
  42. GRB000418, K'-band photometry
  43. GRB 000418, Optical Observation
  44. GRB 000418, optical observation
  45. GRB000424 Optical Observations
  46. GRB 000418, Optical Observation
  47. GRB000424, optical observations
  48. GRB000424, optical observations
  49. GRB 000424, Optical Observations
  50. GRB 000418, Optical Observation
  51. GRB000418, near-infrared observations
  52. BeppoSAX GRB000424
  53. Correction to IPN error box for GRB000419
  54. IPN error box for GRB000418
  55. GRB000419 [IPN Position]
  56. GRB000416 Optical Observations
  57. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  58. GRB000416 BRJK observations
  59. 1SAXJ1715.0-7134 refined position
  60. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  61. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  62. Budget cuts in BeppoSAX operations: impact on GRB observations
  63. GRB 000408, optical observations
  64. Refined IPN error box for GRB000408
  65. GRB 991208, UBVRI field photometry
  66. GRB000301c results
  67. GRB000408: Optical CCD Observations from MIRO
  68. GRB000408, lotis optical observations
  69. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  70. GRB000408 [IPN Position]
  71. GRB000326 Optical Observations
  72. GRB000301C - Addendum to GCN 623
  73. GRB000301C - R magnitude lower limit
  74. GRB000326, Further VLA observations
  75. GRB 000323, optical observations
  76. GRB 000326: Optical Observations
  77. GRB000326, Radio observations
  78. GRB000326 [IPN Position]
  79. GRB 000307 optical observations
  80. GRB000323 [IPN Position]
  81. Single error box for GRB000315
  82. GRB000315 [IPN Positions]
  83. GRB000313, Radio observations
  84. GRB 000313 - optical transient in the BATSE error box
  85. GRB000301C - B and R photometry
  86. GRB000301C - R photometry
  87. GRB 000307, Optical Observations
  88. GRB 000307, BVRI Field Photometry
  89. GRB 000301C: Optical Spectrum and Redshift
  90. GRB 000301C: Optical Spectrum and Redshift
  91. GRB 000301C: A Precise Redshift Determination
  92. GRB 000301C, Optical Observation
  93. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  94. GRB 000301C: HST/STIS CCD Imaging of the field
  95. IPN error box for GRB000307
  96. GRB 000301c: K' observations
  97. GRB000301C, optical R-band observations
  98. GRB000301c - R photometry and nearby faint source confirmation
  99. GRB 000301C, Optical Observation
  100. GRB 000301c: K' observations

Advanced

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