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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"

39156 results found.

  1. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  2. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  3. IPN localization and time history of GRB000528
  4. New IPN localization of GRB000529
  5. GRB 000528 - WFC measurements
  6. GRB000528: BeppoSAX GRBM observations
  7. GRB 000528 Optical Observations
  8. GRB000519, BVRI field photometry
  9. IPN triangulation of GRB000519
  10. IPN triangulation of GRB000516
  11. Re: GRB000508B : Optical observations
  12. GRB 000418, Optical observation
  13. GRB000508B, optical photometry
  14. GRB000508B, BVR field photometry
  15. Possible GRB-related phenomenon
  16. RXTE/ASM and IPN localization of GRB 000508B
  17. GRB000424, UBVRI field photometry
  18. GRB 000424 Optical Observations
  19. GRB000418, UBVRI field photometry update
  20. The redshift of GRB 000418
  21. GRB 000429, optical observation
  22. GRB 000429, UBVRI field photometry
  23. IPN localization of GRB000429
  24. GRB 000418, UBVRI field photometry
  25. GRB000418, K'-band photometry
  26. GRB 000418, Optical Observation
  27. GRB 000418, optical observation
  28. GRB000424 Optical Observations
  29. GRB 000418, Optical Observation
  30. GRB 000424, Optical Observations
  31. GRB 000418, Optical Observation
  32. GRB000418, near-infrared observations
  33. Correction to IPN error box for GRB000419
  34. IPN error box for GRB000418
  35. GRB000419 [IPN Position]
  36. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  37. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  38. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  39. Budget cuts in BeppoSAX operations: impact on GRB observations
  40. GRB 000408, optical observations
  41. Refined IPN error box for GRB000408
  42. GRB 991208, UBVRI field photometry
  43. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  44. GRB000408 [IPN Position]
  45. GRB000326 Optical Observations
  46. GRB000301C - Addendum to GCN 623
  47. GRB000301C - R magnitude lower limit
  48. GRB 000323, optical observations
  49. GRB 000326: Optical Observations
  50. GRB000326, Radio observations
  51. GRB000326 [IPN Position]
  52. GRB 000307 optical observations
  53. GRB000323 [IPN Position]
  54. GRB000315 [IPN Positions]
  55. GRB 000313 - optical transient in the BATSE error box
  56. GRB000301C - B and R photometry
  57. GRB000301C - R photometry
  58. GRB 000307, Optical Observations
  59. GRB 000307, BVRI Field Photometry
  60. GRB 000301C: Optical Spectrum and Redshift
  61. GRB 000301C: Optical Spectrum and Redshift
  62. GRB 000301C: A Precise Redshift Determination
  63. GRB 000301C, Optical Observation
  64. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  65. GRB 000301C: HST/STIS CCD Imaging of the field
  66. IPN error box for GRB000307
  67. GRB 000301c: K' observations
  68. GRB000301C, optical R-band observations
  69. GRB000301c - R photometry and nearby faint source confirmation
  70. GRB 000301C, Optical Observation
  71. GRB 000301c: K' observations
  72. GRB 000301C Optical Observations
  73. GRB 000301C: K' Observations
  74. GRB000301C - Host galaxy not detected in R (?)
  75. GRB000301C, Radio observations
  76. GRB000301C, Radio observations
  77. GRB000301C optical observations
  78. GRB 000301c near-IR observations
  79. GRB 000301C, Optical Color
  80. GRB000301C, Optical Spectroscopy
  81. GRB 000301C, UBVRI field photometry
  82. GRB 000301C, Optical Observation
  83. GRB000301C 250 GHz detection
  84. GRB 000301C R-band observation
  85. GRB 000301C, Optical Observation
  86. GRB000301C, near-infrared observations (JHK' photometry)
  87. GRB 000301C: OT confirmed
  88. GRB000301c optical observations
  89. GRB 000301A, Radio Observations
  90. GRB000301C, optical observations
  91. GRB000301c, near-infrared observations
  92. GRB000301C
  93. GRB 000301C : Optical Candidate
  94. GRB000301C: RXTE/ASM and IPN localizations
  95. GRB000226 [IPN Position]
  96. HST Observations of GRB 990712
  97. GRB 000214 near-IR observations
  98. GRB 000115 Optical observations
  99. GRB 000214, Radio Observations
  100. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation

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