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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"

35259 results found.

  1. GRB000528: follow-up X-ray measurements and update of IPN annulus
  2. GRB980519, HST/STIS observations of the host galaxy
  3. GRB000607, Radio Observations
  4. GRB000604 - Optical observations
  5. GRB000607, A SHORT, HARD BURST
  6. GRB000604, optical observations
  7. GRB000528, optical observations at ESO
  8. GRB 000604 optical observations
  9. GRB 000418: Detection of the Host Galaxy
  10. GRB000604, optical observations, comparison with DPOSS
  11. GRB000604 [IPN Position]
  12. X-ray Afterglow of GRB 000529
  13. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  14. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  15. IPN localization and time history of GRB000528
  16. New IPN localization of GRB000529
  17. GRB 000528 - WFC measurements
  18. GRB000528: BeppoSAX GRBM observations
  19. GRB 000528 Optical Observations
  20. GRB000519, BVRI field photometry
  21. IPN triangulation of GRB000519
  22. IPN triangulation of GRB000516
  23. Re: GRB000508B : Optical observations
  24. GRB 000418, Optical observation
  25. GRB000508B, optical photometry
  26. GRB000508B, BVR field photometry
  27. Possible GRB-related phenomenon
  28. RXTE/ASM and IPN localization of GRB 000508B
  29. GRB000424, UBVRI field photometry
  30. GRB 000424 Optical Observations
  31. GRB000418, UBVRI field photometry update
  32. The redshift of GRB 000418
  33. GRB 000429, optical observation
  34. GRB 000429, UBVRI field photometry
  35. IPN localization of GRB000429
  36. GRB 000418, UBVRI field photometry
  37. GRB000418, K'-band photometry
  38. GRB 000418, Optical Observation
  39. GRB 000418, optical observation
  40. GRB000424 Optical Observations
  41. GRB 000418, Optical Observation
  42. GRB 000424, Optical Observations
  43. GRB 000418, Optical Observation
  44. GRB000418, near-infrared observations
  45. Correction to IPN error box for GRB000419
  46. IPN error box for GRB000418
  47. GRB000419 [IPN Position]
  48. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  49. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  50. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  51. Budget cuts in BeppoSAX operations: impact on GRB observations
  52. GRB 000408, optical observations
  53. Refined IPN error box for GRB000408
  54. GRB 991208, UBVRI field photometry
  55. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  56. GRB000408 [IPN Position]
  57. GRB000326 Optical Observations
  58. GRB000301C - Addendum to GCN 623
  59. GRB000301C - R magnitude lower limit
  60. GRB 000323, optical observations
  61. GRB 000326: Optical Observations
  62. GRB000326, Radio observations
  63. GRB000326 [IPN Position]
  64. GRB 000307 optical observations
  65. GRB000323 [IPN Position]
  66. GRB000315 [IPN Positions]
  67. GRB 000313 - optical transient in the BATSE error box
  68. GRB000301C - B and R photometry
  69. GRB000301C - R photometry
  70. GRB 000307, Optical Observations
  71. GRB 000307, BVRI Field Photometry
  72. GRB 000301C: Optical Spectrum and Redshift
  73. GRB 000301C: Optical Spectrum and Redshift
  74. GRB 000301C: A Precise Redshift Determination
  75. GRB 000301C, Optical Observation
  76. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  77. GRB 000301C: HST/STIS CCD Imaging of the field
  78. IPN error box for GRB000307
  79. GRB 000301c: K' observations
  80. GRB000301C, optical R-band observations
  81. GRB000301c - R photometry and nearby faint source confirmation
  82. GRB 000301C, Optical Observation
  83. GRB 000301c: K' observations
  84. GRB 000301C Optical Observations
  85. GRB 000301C: K' Observations
  86. GRB000301C - Host galaxy not detected in R (?)
  87. GRB000301C optical observations
  88. GRB 000301c near-IR observations
  89. GRB 000301C, Optical Color
  90. GRB000301C, Optical Spectroscopy
  91. GRB 000301C, UBVRI field photometry
  92. GRB 000301C, Optical Observation
  93. GRB000301C 250 GHz detection
  94. GRB 000301C R-band observation
  95. GRB 000301C, Optical Observation
  96. GRB000301C, near-infrared observations (JHK' photometry)
  97. GRB 000301C: OT confirmed
  98. GRB000301c optical observations
  99. GRB 000301A, Radio Observations
  100. GRB000301C, optical observations

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