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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 980519
  2. GRB980519 optical observations
  3. GRB 980519 Optical Observations
  4. GRB980519 BATSE Observations
  5. GRB970519, optical follow-up at Schmidt Calern
  6. GRB980519 optical observations
  7. GRB980519 Optical Observations
  8. GRB980519 Optical Observations
  9. GRB980519 IPN POSITION
  10. GRB980519 Optical Observations
  11. GRB 980519 Optical Observations
  12. GRB980519 optical observations
  13. GRB980515, BeppoSAX IAUC to be submitted
  14. BATSE on-board GRB trigger change
  15. GRB980519, BeppoSAX-WFC updated position
  16. GRB980519, BeppoSAX-WFC position
  17. GRB980515: SAX-WFC updated position
  18. BeppoSAX GRB ALERT: updated position of grb980515
  19. GRB 980425 Radio Light Curve
  20. GRB 980425 Brightness Temperature
  21. BSAX Observations of GRB980425 field
  22. IPN web site of GRBs
  23. GRB980425 BATSE observations
  24. SAX J0840.7+2248 Optical Observations
  25. GRB 980425 optical observations
  26. GRB980425: optical obs.
  27. GRB980425: Radio Observations
  28. GRB 980425 optical observations
  29. report on BSAX observations of GRB980425
  30. GRB 980425 optical observations
  31. GRB 980329 ROSAT observation
  32. GRB980326 X-ray Observations
  33. GRB980326, optical observations
  34. GRB980326, optical observations
  35. GRB980329, Fading IR counterpart to radio source
  36. GRByymmdd, Announcement of automation
  37. GRB980326 IPN annulus
  38. GRB980329
  39. GRB980329 Keck K-band observations
  40. GRB980329 sub-millimeter observations
  41. GRB980329 IPN annulus
  42. GRB980329 optical observations
  43. GRB980329 near-IR observations
  44. GRB980329 near-IR observations
  45. GRB980329 optical observations
  46. GRB980329 infrared observations
  47. GRB980329 optical observations
  48. GRB980326 optical observations
  49. GRB980329 optical observations
  50. GRB980329 VLA observations
  51. GRB980329 near IR observations
  52. GRB980329 optical observations
  53. GRB980329 optical observations
  54. GRB980329 optical observations
  55. GRB980326 optical observations
  56. GRB980326 optical observations
  57. GRB980326 optical observations
  58. GRB980326 optical observations
  59. GRB970508 SAO RAS optical observations
  60. Optical Observations of GRB 970508
  61. GRB 971214: Redshift from Keck Observations
  62. Near-IR follow-up on GRB 971227
  63. GRB971214: Keck R & I-band Observations
  64. GRB 971227: Optical Observations
  65. Optical Observations of the GRB 971227 field
  66. Optical Observations on GRB 971227
  67. GRB971227: Plaskett R-band observations
  68. GRB 971227: Optical clarifications
  69. Optical Observations for GRB 971227
  70. GRB971227: Further CAHA R-band images
  71. GRB971227: LOTIS observations
  72. GRB 971227: CAHA R-band images
  73. GRB 971227: Optical observations
  74. GRB971214: Optical Observations and Calibrations
  75. Sub-millimeter Observations of GRB 971214 at the JCMT
  76. GRB 971214: EUVE Observations
  77. GRB 971214: Redshift from Keck Optical Observations
  78. GRB 971214: Redshift from Keck Optical Observations
  79. GRB 971214: Apache Point Observatory Optical Observations
  80. GRB 971214: KPNO Optical Observations
  81. Optical Observations of GRB 971214 at Keck
  82. GRB 971214: Optical Observations
  83. Radio Observations of GRB 971214 at the VLA
  84. GRB 971214: USNOFS Observations Summary
  85. GRB 971024: KPNO Optical Observations Summary
  86. GRB 971024: Refined analysis by USNOFS Observations
  87. GRB 971024: KPNO Optical Observations
  88. GRB 971024: USNO Observations
  89. GRB 970925: BATSE Localization
  90. IRAS 18119-1342 and the possible new SGR
  91. Possible new SGR from US Naval Observatory
  92. RXTE Observations of SGR 1814-13
  93. GRB 970828: Palomar Observations
  94. GRB 970228: Keck/LRIS Optical Observations

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