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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. GRB980703: radio source/optical transient
  2. BeppoSAX NFI observations of GRB 980703
  3. GRB 980703: ASM Position & Intensity
  4. GRB980703
  5. GRB980519 observation report
  6. GRB980703 optical followup
  7. SGR1627-41
  8. Radio observations of SGRs
  9. SGR1900+14 field optical observations
  10. GRB 980613 Near-IR observations
  11. GRB980613, optical observations
  12. GRB 980613: Optical transient and its host galaxy
  13. SGR1627-41, RXTE/ASM observations
  14. SGR1627-41, Refined IPN annulus location
  15. GRB 980613: Detection of the probable host galaxy
  16. Reduced error box of SGR 1627-41
  17. GRB 980613: BATSE Observations
  18. SGR1627-41, BeppoSAX-GRBM detections
  19. SGR 1627-41
  20. GRB 980613 Optical Observations
  21. GRB 980613 optical observations
  22. Discovery of a new SGR source, SGR1627-41
  23. GRB980613 Optical Observations
  24. GRB980613 observations from Palomar
  25. GRB980613 BeppoSAX-NFI follow up
  26. GRB 980613 new optical/IR observations
  27. GRB 980613 optical/IR obs.
  28. GRB980613 Near Infra-Red Observations
  29. GRB980611
  30. GRB980613, BeppoSAX WFC positions
  31. GRB971214 Secondary Standards
  32. SGR 1900+14
  33. GRB980519 Secondary Standards
  34. SGR1900+14
  35. SGR1900+14
  36. BATSE on-board GRB trigger change
  37. GRB 980519 Optical Observations
  38. GRB980519 optical observations
  39. GRB980519 I-band observations
  40. GRB 980519
  41. GRB980519 optical observations
  42. GRB 980519 Optical Observations
  43. GRB980519 BATSE Observations
  44. GRB970519, optical follow-up at Schmidt Calern
  45. GRB980519 optical observations
  46. GRB980519 Optical Observations
  47. GRB980519 Optical Observations
  48. GRB980519 IPN POSITION
  49. GRB980519 Optical Observations
  50. GRB 980519 Optical Observations
  51. GRB980519 optical observations
  52. GRB980515, BeppoSAX IAUC to be submitted
  53. BATSE on-board GRB trigger change
  54. GRB980519, BeppoSAX-WFC updated position
  55. GRB980519, BeppoSAX-WFC position
  56. GRB980515: SAX-WFC updated position
  57. BeppoSAX GRB ALERT: updated position of grb980515
  58. GRB 980425 Radio Light Curve
  59. GRB 980425 Brightness Temperature
  60. BSAX Observations of GRB980425 field
  61. IPN web site of GRBs
  62. GRB980425 BATSE observations
  63. SAX J0840.7+2248 Optical Observations
  64. GRB 980425 optical observations
  65. GRB980425: optical obs.
  66. GRB980425: Radio Observations
  67. GRB 980425 optical observations
  68. report on BSAX observations of GRB980425
  69. GRB 980425 optical observations
  70. GRB 980329 ROSAT observation
  71. GRB980326 X-ray Observations
  72. GRB980326, optical observations
  73. GRB980326, optical observations
  74. GRB980329, Fading IR counterpart to radio source
  75. GRByymmdd, Announcement of automation
  76. GRB980326 IPN annulus
  77. GRB980329
  78. GRB980329 Keck K-band observations
  79. GRB980329 sub-millimeter observations
  80. GRB980329 IPN annulus
  81. GRB980329 optical observations
  82. GRB980329 near-IR observations
  83. GRB980329 near-IR observations
  84. GRB980329 optical observations
  85. GRB980329 infrared observations
  86. GRB980329 optical observations
  87. GRB980326 optical observations
  88. GRB980329 optical observations
  89. GRB980329 VLA observations
  90. GRB980329 near IR observations
  91. GRB980329 optical observations
  92. GRB980329 optical observations
  93. GRB980329 optical observations
  94. GRB980326 optical observations
  95. GRB980326 optical observations
  96. GRB980326 optical observations
  97. GRB980326 optical observations
  98. GRB970508 SAO RAS optical observations
  99. Optical Observations of GRB 970508
  100. GRB 971214: Redshift from Keck Observations

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