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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. Optical Observations of the Host Galaxy of GRB 980519
  2. GRB980519, Optical Observations
  3. GRB980703, Host galaxy multicolor photometry
  4. GRB980703 - BeppoSAX/GRBM detection
  5. GRB 980703 (NFI observations)
  6. GRB980703 optical photometry
  7. GRB 980703: BATSE Observations
  8. GRB980703 optical observations
  9. GRB980703: Radio transient
  10. GRB980703 H-band Observations
  11. GRB 980703: Spectrum of the proposed optical counterpart
  12. RXTE Observation of GRB 980706
  13. GRB980703: Spectrum of the proposed optical counterpart
  14. GRB980703 Transient Optical Follow-Up
  15. GRB980703: LOTIS observation at early times
  16. GRB980613 Optical Observations
  17. GRB 980703
  18. GRB980703 (I band observations)
  19. GRB 980703 H-band Observations
  20. GRB980703 (optical R observations)
  21. GRB980706
  22. GRB980703: radio source/optical transient
  23. BeppoSAX NFI observations of GRB 980703
  24. GRB 980703: ASM Position & Intensity
  25. GRB980703
  26. GRB980519 observation report
  27. GRB980703 optical followup
  28. SGR1627-41
  29. Radio observations of SGRs
  30. SGR1900+14 field optical observations
  31. GRB 980613 Near-IR observations
  32. GRB980613, optical observations
  33. GRB 980613: Optical transient and its host galaxy
  34. SGR1627-41, RXTE/ASM observations
  35. SGR1627-41, Refined IPN annulus location
  36. GRB 980613: Detection of the probable host galaxy
  37. Reduced error box of SGR 1627-41
  38. GRB 980613: BATSE Observations
  39. SGR1627-41, BeppoSAX-GRBM detections
  40. SGR 1627-41
  41. GRB 980613 Optical Observations
  42. GRB 980613 optical observations
  43. Discovery of a new SGR source, SGR1627-41
  44. GRB980613 Optical Observations
  45. GRB980613 observations from Palomar
  46. GRB980613 BeppoSAX-NFI follow up
  47. GRB 980613 new optical/IR observations
  48. GRB 980613 optical/IR obs.
  49. GRB980613 Near Infra-Red Observations
  50. GRB980611
  51. GRB980613, BeppoSAX WFC positions
  52. GRB971214 Secondary Standards
  53. SGR 1900+14
  54. GRB980519 Secondary Standards
  55. SGR1900+14
  56. SGR1900+14
  57. BATSE on-board GRB trigger change
  58. GRB 980519 Optical Observations
  59. GRB980519 optical observations
  60. GRB980519 I-band observations
  61. GRB 980519
  62. GRB980519 optical observations
  63. GRB 980519 Optical Observations
  64. GRB980519 BATSE Observations
  65. GRB970519, optical follow-up at Schmidt Calern
  66. GRB980519 optical observations
  67. GRB980519 Optical Observations
  68. GRB980519 Optical Observations
  69. GRB980519 IPN POSITION
  70. GRB980519 Optical Observations
  71. GRB 980519 Optical Observations
  72. GRB980519 optical observations
  73. GRB980515, BeppoSAX IAUC to be submitted
  74. BATSE on-board GRB trigger change
  75. GRB980519, BeppoSAX-WFC updated position
  76. GRB980519, BeppoSAX-WFC position
  77. GRB980515: SAX-WFC updated position
  78. BeppoSAX GRB ALERT: updated position of grb980515
  79. GRB 980425 Radio Light Curve
  80. GRB 980425 Brightness Temperature
  81. BSAX Observations of GRB980425 field
  82. IPN web site of GRBs
  83. GRB980425 BATSE observations
  84. SAX J0840.7+2248 Optical Observations
  85. GRB 980425 optical observations
  86. GRB980425: optical obs.
  87. GRB980425: Radio Observations
  88. GRB 980425 optical observations
  89. report on BSAX observations of GRB980425
  90. GRB 980425 optical observations
  91. GRB 980329 ROSAT observation
  92. GRB980326 X-ray Observations
  93. GRB980326, optical observations
  94. GRB980326, optical observations
  95. GRB980329, Fading IR counterpart to radio source
  96. GRByymmdd, Announcement of automation
  97. GRB980326 IPN annulus
  98. GRB980329
  99. GRB980329 Keck K-band observations
  100. GRB980329 sub-millimeter observations

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