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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. GRB981220 I-band Observations
  2. GRB981220 Optical Observations
  3. GRB 981220
  4. GRB 981220 Optical Observations
  5. GRB 981220, optical observations
  6. GRB 980326/Host Galaxy
  7. GRB981220 IPN error box
  8. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  9. BeppoSAX NFI Observation of GRB980425
  10. GRB980329 R,I flux calibration and R,I,K upper limits
  11. GRB980425 Optical Follow-up
  12. GRB980425: X-ray revised positions
  13. GRB 980923 BATSE Observations
  14. SGR1900+14, BeppoSAX-GRBM observations
  15. GRB980703 Very Long Baseline Interferometry
  16. GRB970508 optical observations
  17. GRB971214, association with a Galactic star?
  18. Optical Observations of the Host Galaxy of GRB 980519
  19. GRB980519, Optical Observations
  20. GRB980703, Host galaxy multicolor photometry
  21. GRB980703 - BeppoSAX/GRBM detection
  22. GRB 980703 (NFI observations)
  23. GRB980703 optical photometry
  24. GRB 980703: BATSE Observations
  25. GRB980703 optical observations
  26. GRB980703: Radio transient
  27. GRB980703 H-band Observations
  28. GRB 980703: Spectrum of the proposed optical counterpart
  29. RXTE Observation of GRB 980706
  30. GRB980703: Spectrum of the proposed optical counterpart
  31. GRB980703 Transient Optical Follow-Up
  32. GRB980703: LOTIS observation at early times
  33. GRB980613 Optical Observations
  34. GRB 980703
  35. GRB980703 (I band observations)
  36. GRB 980703 H-band Observations
  37. GRB980703 (optical R observations)
  38. GRB980706
  39. GRB980703: radio source/optical transient
  40. BeppoSAX NFI observations of GRB 980703
  41. GRB 980703: ASM Position & Intensity
  42. GRB980703
  43. GRB980519 observation report
  44. GRB980703 optical followup
  45. SGR1627-41
  46. Radio observations of SGRs
  47. SGR1900+14 field optical observations
  48. GRB 980613 Near-IR observations
  49. GRB980613, optical observations
  50. GRB 980613: Optical transient and its host galaxy
  51. SGR1627-41, RXTE/ASM observations
  52. SGR1627-41, Refined IPN annulus location
  53. GRB 980613: Detection of the probable host galaxy
  54. Reduced error box of SGR 1627-41
  55. GRB 980613: BATSE Observations
  56. SGR1627-41, BeppoSAX-GRBM detections
  57. SGR 1627-41
  58. GRB 980613 Optical Observations
  59. GRB 980613 optical observations
  60. Discovery of a new SGR source, SGR1627-41
  61. GRB980613 Optical Observations
  62. GRB980613 observations from Palomar
  63. GRB980613 BeppoSAX-NFI follow up
  64. GRB 980613 new optical/IR observations
  65. GRB 980613 optical/IR obs.
  66. GRB980613 Near Infra-Red Observations
  67. GRB980611
  68. GRB980613, BeppoSAX WFC positions
  69. GRB971214 Secondary Standards
  70. SGR 1900+14
  71. GRB980519 Secondary Standards
  72. SGR1900+14
  73. SGR1900+14
  74. BATSE on-board GRB trigger change
  75. GRB 980519 Optical Observations
  76. GRB980519 optical observations
  77. GRB980519 I-band observations
  78. GRB 980519
  79. GRB980519 optical observations
  80. GRB 980519 Optical Observations
  81. GRB980519 BATSE Observations
  82. GRB970519, optical follow-up at Schmidt Calern
  83. GRB980519 optical observations
  84. GRB980519 Optical Observations
  85. GRB980519 Optical Observations
  86. GRB980519 IPN POSITION
  87. GRB980519 Optical Observations
  88. GRB 980519 Optical Observations
  89. GRB980519 optical observations
  90. GRB980515, BeppoSAX IAUC to be submitted
  91. BATSE on-board GRB trigger change
  92. GRB980519, BeppoSAX-WFC updated position
  93. GRB980519, BeppoSAX-WFC position
  94. GRB980515: SAX-WFC updated position
  95. BeppoSAX GRB ALERT: updated position of grb980515
  96. GRB 980425 Radio Light Curve
  97. GRB 980425 Brightness Temperature
  98. BSAX Observations of GRB980425 field
  99. IPN web site of GRBs
  100. GRB980425 BATSE observations

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