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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"

32504 results found.

  1. GRB000615, R-band photometry
  2. GRB980425, HST/STIS observations of the host galaxy
  3. The Hosts of GRB 980703 and GRB 971214
  4. GRB 000301C: Further Late-Time HST/STIS observations
  5. GRB000528: follow-up X-ray measurements and update of IPN annulus
  6. Optical Follow-up of GRB000529 Error Box
  7. GRB000607, Radio Observations
  8. GRB000604 optical non-detection
  9. GRB000604 - Optical observations
  10. GRB000604, optical observations
  11. GRB000528, optical observations at ESO
  12. GRB 000604 optical observations
  13. GRB 000418: Detection of the Host Galaxy
  14. GRB000604, optical observations, comparison with DPOSS
  15. GRB000528, Radio Observations
  16. X-ray Afterglow of GRB 000529
  17. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  18. IPN localization and time history of GRB000528
  19. New IPN localization of GRB000529
  20. GRB000519: Optical observations
  21. IPN localization of GRB000529
  22. GRB 000528 - WFC measurements
  23. IPN triangulation of GRB000519
  24. Re: GRB000508B : Optical observations
  25. GRB 000418, Optical observation
  26. GRB000508B, optical photometry
  27. Possible GRB-related phenomenon
  28. GRB 000424 Optical Observations
  29. The redshift of GRB 000418
  30. GRB000424, optical observations
  31. GRB 000429, optical observation
  32. GRB000418, Radio detection
  33. GRB000418, K'-band photometry
  34. GRB 000418, Optical Observation
  35. GRB 000418, optical observation
  36. GRB000424 Optical Observations
  37. GRB 000418, Optical Observation
  38. GRB000424, optical observations
  39. GRB000424, optical observations
  40. GRB 000424, Optical Observations
  41. GRB 000418, Optical Observation
  42. GRB000418, near-infrared observations
  43. BeppoSAX GRB000424
  44. Correction to IPN error box for GRB000419
  45. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  46. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  47. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  48. GRB 000408, optical observations
  49. Refined IPN error box for GRB000408
  50. GRB000301c results
  51. GRB000408: Optical CCD Observations from MIRO
  52. GRB000408, lotis optical observations
  53. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  54. GRB000326 Optical Observations
  55. GRB000301C - Addendum to GCN 623
  56. GRB000326, Further VLA observations
  57. GRB 000323, optical observations
  58. GRB 000326: Optical Observations
  59. GRB000326, Radio observations
  60. GRB 000307 optical observations
  61. Single error box for GRB000315
  62. GRB000313, Radio observations
  63. GRB000301C - B and R photometry
  64. GRB 000307, Optical Observations
  65. GRB 000301C: Optical Spectrum and Redshift
  66. GRB 000301C: Optical Spectrum and Redshift
  67. GRB 000301C: A Precise Redshift Determination
  68. GRB 000301C, Optical Observation
  69. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  70. GRB 000301C: HST/STIS CCD Imaging of the field
  71. GRB000301C, optical R-band observations
  72. GRB000301c - R photometry and nearby faint source confirmation
  73. GRB 000301C, Optical Observation
  74. GRB 000301C Optical Observations
  75. GRB 000301C: K' Observations
  76. GRB000301C OT candidate optical observations
  77. Optical observations of GRB000301c
  78. GRB000301C, Radio observations
  79. GRB000301C, Radio observations
  80. GRB000301C, near-infrared observations (JHK' imaging)
  81. GRB 000301C, Optical Color
  82. GRB 000301C, UBVRI field photometry
  83. GRB 000301C, Optical Observation
  84. GRB000301C, optical observations
  85. GRB000301C 250 GHz detection
  86. GRB 000301C R-band observation
  87. GRB 000301C, Optical Observation
  88. GRB000301C, near-infrared observations (JHK' photometry)
  89. GRB 000301C: OT confirmed
  90. GRB000301c optical observations
  91. GRB 000301A, Radio Observations
  92. GRB000301C, optical observations
  93. GRB000301c, near-infrared observations
  94. GRB000301C
  95. GRB 000301C : Optical Candidate
  96. Radio observations of the error box of GRB000301A
  97. HST Observations of GRB 990712
  98. GRB 000115 Optical observations
  99. GRB 000214, Radio Observations
  100. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation

Advanced

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