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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. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  2. BeppoSAX NFI Observation of GRB980425
  3. GRB980329 R,I flux calibration and R,I,K upper limits
  4. GRB980425 Optical Follow-up
  5. GRB980425: X-ray revised positions
  6. GRB 980923 BATSE Observations
  7. SGR1900+14, BeppoSAX-GRBM observations
  8. GRB980703 Very Long Baseline Interferometry
  9. GRB970508 optical observations
  10. GRB971214, association with a Galactic star?
  11. Optical Observations of the Host Galaxy of GRB 980519
  12. GRB980519, Optical Observations
  13. GRB980703, Host galaxy multicolor photometry
  14. GRB980703 - BeppoSAX/GRBM detection
  15. GRB 980703 (NFI observations)
  16. GRB980703 optical photometry
  17. GRB 980703: BATSE Observations
  18. GRB980703 optical observations
  19. GRB980703: Radio transient
  20. GRB980703 H-band Observations
  21. GRB 980703: Spectrum of the proposed optical counterpart
  22. RXTE Observation of GRB 980706
  23. GRB980703: Spectrum of the proposed optical counterpart
  24. GRB980703 Transient Optical Follow-Up
  25. GRB980703: LOTIS observation at early times
  26. GRB980613 Optical Observations
  27. GRB 980703
  28. GRB980703 (I band observations)
  29. GRB 980703 H-band Observations
  30. GRB980703 (optical R observations)
  31. GRB980706
  32. GRB980703: radio source/optical transient
  33. BeppoSAX NFI observations of GRB 980703
  34. GRB 980703: ASM Position & Intensity
  35. GRB980703
  36. GRB980519 observation report
  37. GRB980703 optical followup
  38. SGR1627-41
  39. Radio observations of SGRs
  40. SGR1900+14 field optical observations
  41. GRB 980613 Near-IR observations
  42. GRB980613, optical observations
  43. GRB 980613: Optical transient and its host galaxy
  44. SGR1627-41, RXTE/ASM observations
  45. SGR1627-41, Refined IPN annulus location
  46. GRB 980613: Detection of the probable host galaxy
  47. Reduced error box of SGR 1627-41
  48. GRB 980613: BATSE Observations
  49. SGR1627-41, BeppoSAX-GRBM detections
  50. SGR 1627-41
  51. GRB 980613 Optical Observations
  52. GRB 980613 optical observations
  53. Discovery of a new SGR source, SGR1627-41
  54. GRB980613 Optical Observations
  55. GRB980613 observations from Palomar
  56. GRB980613 BeppoSAX-NFI follow up
  57. GRB 980613 new optical/IR observations
  58. GRB 980613 optical/IR obs.
  59. GRB980613 Near Infra-Red Observations
  60. GRB980611
  61. GRB980613, BeppoSAX WFC positions
  62. GRB971214 Secondary Standards
  63. SGR 1900+14
  64. GRB980519 Secondary Standards
  65. SGR1900+14
  66. SGR1900+14
  67. BATSE on-board GRB trigger change
  68. GRB 980519 Optical Observations
  69. GRB980519 optical observations
  70. GRB980519 I-band observations
  71. GRB 980519
  72. GRB980519 optical observations
  73. GRB 980519 Optical Observations
  74. GRB980519 BATSE Observations
  75. GRB970519, optical follow-up at Schmidt Calern
  76. GRB980519 optical observations
  77. GRB980519 Optical Observations
  78. GRB980519 Optical Observations
  79. GRB980519 IPN POSITION
  80. GRB980519 Optical Observations
  81. GRB 980519 Optical Observations
  82. GRB980519 optical observations
  83. GRB980515, BeppoSAX IAUC to be submitted
  84. BATSE on-board GRB trigger change
  85. GRB980519, BeppoSAX-WFC updated position
  86. GRB980519, BeppoSAX-WFC position
  87. GRB980515: SAX-WFC updated position
  88. BeppoSAX GRB ALERT: updated position of grb980515
  89. GRB 980425 Radio Light Curve
  90. GRB 980425 Brightness Temperature
  91. BSAX Observations of GRB980425 field
  92. IPN web site of GRBs
  93. GRB980425 BATSE observations
  94. SAX J0840.7+2248 Optical Observations
  95. GRB 980425 optical observations
  96. GRB980425: optical obs.
  97. GRB980425: Radio Observations
  98. GRB 980425 optical observations
  99. report on BSAX observations of GRB980425
  100. GRB 980425 optical observations

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