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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').
  1. GRB000418, K'-band photometry
  2. GRB 000418, Optical Observation
  3. GRB 000418, optical observation
  4. GRB000424 Optical Observations
  5. GRB 000418, Optical Observation
  6. GRB000424, optical observations
  7. GRB000424, optical observations
  8. GRB 000424, Optical Observations
  9. GRB 000418, Optical Observation
  10. GRB000418, near-infrared observations
  11. BeppoSAX GRB000424
  12. Correction to IPN error box for GRB000419
  13. IPN error box for GRB000418
  14. GRB000419 [IPN Position]
  15. GRB000416 Optical Observations
  16. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  17. GRB000416 BRJK observations
  18. 1SAXJ1715.0-7134 refined position
  19. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  20. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  21. Budget cuts in BeppoSAX operations: impact on GRB observations
  22. GRB 000408, optical observations
  23. Refined IPN error box for GRB000408
  24. GRB 991208, UBVRI field photometry
  25. GRB000301c results
  26. GRB000408: Optical CCD Observations from MIRO
  27. GRB000408, lotis optical observations
  28. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  29. GRB000408 [IPN Position]
  30. GRB000326 Optical Observations
  31. GRB000301C - Addendum to GCN 623
  32. GRB000301C - R magnitude lower limit
  33. GRB000326, Further VLA observations
  34. GRB 000323, optical observations
  35. GRB 000326: Optical Observations
  36. GRB000326, Radio observations
  37. GRB000326 [IPN Position]
  38. GRB 000307 optical observations
  39. GRB000323 [IPN Position]
  40. Single error box for GRB000315
  41. GRB000315 [IPN Positions]
  42. GRB000313, Radio observations
  43. GRB 000313 - optical transient in the BATSE error box
  44. GRB000301C - B and R photometry
  45. GRB000301C - R photometry
  46. GRB 000307, Optical Observations
  47. GRB 000307, BVRI Field Photometry
  48. GRB 000301C: Optical Spectrum and Redshift
  49. GRB 000301C: Optical Spectrum and Redshift
  50. GRB 000301C: A Precise Redshift Determination
  51. GRB 000301C, Optical Observation
  52. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  53. GRB 000301C: HST/STIS CCD Imaging of the field
  54. IPN error box for GRB000307
  55. GRB 000301c: K' observations
  56. GRB000301C, optical R-band observations
  57. GRB000301c - R photometry and nearby faint source confirmation
  58. GRB 000301C, Optical Observation
  59. GRB 000301c: K' observations
  60. GRB 000301C Optical Observations
  61. GRB 000301C: K' Observations
  62. GRB000301C OT candidate optical observations
  63. GRB000301C - Host galaxy not detected in R (?)
  64. Optical observations of GRB000301c
  65. GRB000301C, Radio observations
  66. GRB000301C, Radio observations
  67. GRB000301C optical observations
  68. GRB000301C, near-infrared observations (JHK' imaging)
  69. GRB 000301c near-IR observations
  70. GRB 000301C, Optical Color
  71. GRB000301C, Optical Spectroscopy
  72. GRB 000301C, UBVRI field photometry
  73. GRB 000301C, Optical Observation
  74. GRB000301C, optical observations
  75. GRB000301C 250 GHz detection
  76. GRB 000301C R-band observation
  77. GRB 000301C, Optical Observation
  78. GRB000301C, near-infrared observations (JHK' photometry)
  79. GRB 000301C: OT confirmed
  80. GRB000301c optical observations
  81. GRB 000301A, Radio Observations
  82. GRB000301C, optical observations
  83. GRB000301c, near-infrared observations
  84. GRB000301C
  85. GRB 000301C : Optical Candidate
  86. Radio observations of the error box of GRB000301A
  87. GRB000301C: RXTE/ASM and IPN localizations
  88. GRB000301A [IPN Position]
  89. GRB000226 [IPN Position]
  90. HST Observations of GRB 990712
  91. GRB 000214 near-IR observations
  92. GRB 000115 Optical observations
  93. GRB 000214, Radio Observations
  94. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  95. GRB000210, Radio Observations
  96. Correction to GCN 557 (GRB000214: BeppoSAX GRBM and WFC Detection)
  97. GRB 000115, BVRI field photometry
  98. GRB000214: BeppoSAX GRBM and WFC Detection
  99. IPN annulus for GRB000214
  100. BATSE GRB trigger criterion changed

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