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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"

35955 results found.

  1. GRB000607, A SHORT, HARD BURST
  2. GRB000604, optical observations
  3. GRB000528, optical observations at ESO
  4. GRB 000604 optical observations
  5. GRB 000418: Detection of the Host Galaxy
  6. GRB000604, optical observations, comparison with DPOSS
  7. GRB000604 [IPN Position]
  8. X-ray Afterglow of GRB 000529
  9. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  10. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  11. IPN localization and time history of GRB000528
  12. New IPN localization of GRB000529
  13. GRB 000528 - WFC measurements
  14. GRB000528: BeppoSAX GRBM observations
  15. GRB 000528 Optical Observations
  16. GRB000519, BVRI field photometry
  17. IPN triangulation of GRB000519
  18. IPN triangulation of GRB000516
  19. Re: GRB000508B : Optical observations
  20. GRB 000418, Optical observation
  21. GRB000508B, optical photometry
  22. GRB000508B, BVR field photometry
  23. Possible GRB-related phenomenon
  24. RXTE/ASM and IPN localization of GRB 000508B
  25. GRB000424, UBVRI field photometry
  26. GRB 000424 Optical Observations
  27. GRB000418, UBVRI field photometry update
  28. The redshift of GRB 000418
  29. GRB 000429, optical observation
  30. GRB 000429, UBVRI field photometry
  31. IPN localization of GRB000429
  32. GRB 000418, UBVRI field photometry
  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. GRB 000424, Optical Observations
  39. GRB 000418, Optical Observation
  40. GRB000418, near-infrared observations
  41. Correction to IPN error box for GRB000419
  42. IPN error box for GRB000418
  43. GRB000419 [IPN Position]
  44. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  45. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  46. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  47. Budget cuts in BeppoSAX operations: impact on GRB observations
  48. GRB 000408, optical observations
  49. Refined IPN error box for GRB000408
  50. GRB 991208, UBVRI field photometry
  51. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  52. GRB000408 [IPN Position]
  53. GRB000326 Optical Observations
  54. GRB000301C - Addendum to GCN 623
  55. GRB000301C - R magnitude lower limit
  56. GRB 000323, optical observations
  57. GRB 000326: Optical Observations
  58. GRB000326, Radio observations
  59. GRB000326 [IPN Position]
  60. GRB 000307 optical observations
  61. GRB000323 [IPN Position]
  62. GRB000315 [IPN Positions]
  63. GRB 000313 - optical transient in the BATSE error box
  64. GRB000301C - B and R photometry
  65. GRB000301C - R photometry
  66. GRB 000307, Optical Observations
  67. GRB 000307, BVRI Field Photometry
  68. GRB 000301C: Optical Spectrum and Redshift
  69. GRB 000301C: Optical Spectrum and Redshift
  70. GRB 000301C: A Precise Redshift Determination
  71. GRB 000301C, Optical Observation
  72. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  73. GRB 000301C: HST/STIS CCD Imaging of the field
  74. IPN error box for GRB000307
  75. GRB 000301c: K' observations
  76. GRB000301C, optical R-band observations
  77. GRB000301c - R photometry and nearby faint source confirmation
  78. GRB 000301C, Optical Observation
  79. GRB 000301c: K' observations
  80. GRB 000301C Optical Observations
  81. GRB 000301C: K' Observations
  82. GRB000301C - Host galaxy not detected in R (?)
  83. GRB000301C optical observations
  84. GRB 000301c near-IR observations
  85. GRB 000301C, Optical Color
  86. GRB000301C, Optical Spectroscopy
  87. GRB 000301C, UBVRI field photometry
  88. GRB 000301C, Optical Observation
  89. GRB000301C 250 GHz detection
  90. GRB 000301C R-band observation
  91. GRB 000301C, Optical Observation
  92. GRB000301C, near-infrared observations (JHK' photometry)
  93. GRB 000301C: OT confirmed
  94. GRB000301c optical observations
  95. GRB 000301A, Radio Observations
  96. GRB000301C, optical observations
  97. GRB000301c, near-infrared observations
  98. GRB000301C
  99. GRB 000301C : Optical Candidate
  100. GRB000301C: RXTE/ASM and IPN localizations

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