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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. SGR1900+14
  2. SGR1900+14
  3. BATSE on-board GRB trigger change
  4. GRB 980519 Optical Observations
  5. GRB980519 optical observations
  6. GRB980519 I-band observations
  7. GRB 980519
  8. GRB980519 optical observations
  9. GRB 980519 Optical Observations
  10. GRB980519 BATSE Observations
  11. GRB970519, optical follow-up at Schmidt Calern
  12. GRB980519 optical observations
  13. GRB980519 Optical Observations
  14. GRB980519 Optical Observations
  15. GRB980519 IPN POSITION
  16. GRB980519 Optical Observations
  17. GRB 980519 Optical Observations
  18. GRB980519 optical observations
  19. GRB980515, BeppoSAX IAUC to be submitted
  20. BATSE on-board GRB trigger change
  21. GRB980519, BeppoSAX-WFC updated position
  22. GRB980519, BeppoSAX-WFC position
  23. GRB980515: SAX-WFC updated position
  24. BeppoSAX GRB ALERT: updated position of grb980515
  25. GRB 980425 Radio Light Curve
  26. GRB 980425 Brightness Temperature
  27. BSAX Observations of GRB980425 field
  28. IPN web site of GRBs
  29. GRB980425 BATSE observations
  30. SAX J0840.7+2248 Optical Observations
  31. GRB 980425 optical observations
  32. GRB980425: optical obs.
  33. GRB980425: Radio Observations
  34. GRB 980425 optical observations
  35. report on BSAX observations of GRB980425
  36. GRB 980425 optical observations
  37. GRB 980329 ROSAT observation
  38. GRB980326 X-ray Observations
  39. GRB980326, optical observations
  40. GRB980326, optical observations
  41. GRB980329, Fading IR counterpart to radio source
  42. GRByymmdd, Announcement of automation
  43. GRB980326 IPN annulus
  44. GRB980329
  45. GRB980329 Keck K-band observations
  46. GRB980329 sub-millimeter observations
  47. GRB980329 IPN annulus
  48. GRB980329 optical observations
  49. GRB980329 near-IR observations
  50. GRB980329 near-IR observations
  51. GRB980329 optical observations
  52. GRB980329 infrared observations
  53. GRB980329 optical observations
  54. GRB980326 optical observations
  55. GRB980329 optical observations
  56. GRB980329 VLA observations
  57. GRB980329 near IR observations
  58. GRB980329 optical observations
  59. GRB980329 optical observations
  60. GRB980329 optical observations
  61. GRB980326 optical observations
  62. GRB980326 optical observations
  63. GRB980326 optical observations
  64. GRB980326 optical observations
  65. GRB970508 SAO RAS optical observations
  66. Optical Observations of GRB 970508
  67. GRB 971214: Redshift from Keck Observations
  68. Near-IR follow-up on GRB 971227
  69. GRB971214: Keck R & I-band Observations
  70. GRB 971227: Optical Observations
  71. Optical Observations of the GRB 971227 field
  72. Optical Observations on GRB 971227
  73. GRB971227: Plaskett R-band observations
  74. GRB 971227: Optical clarifications
  75. Optical Observations for GRB 971227
  76. GRB971227: Further CAHA R-band images
  77. GRB971227: LOTIS observations
  78. GRB 971227: CAHA R-band images
  79. GRB 971227: Optical observations
  80. GRB971214: Optical Observations and Calibrations
  81. Sub-millimeter Observations of GRB 971214 at the JCMT
  82. GRB 971214: EUVE Observations
  83. GRB 971214: Redshift from Keck Optical Observations
  84. GRB 971214: Redshift from Keck Optical Observations
  85. GRB 971214: Apache Point Observatory Optical Observations
  86. GRB 971214: KPNO Optical Observations
  87. Optical Observations of GRB 971214 at Keck
  88. GRB 971214: Optical Observations
  89. Radio Observations of GRB 971214 at the VLA
  90. GRB 971214: USNOFS Observations Summary
  91. GRB 971024: KPNO Optical Observations Summary
  92. GRB 971024: Refined analysis by USNOFS Observations
  93. GRB 971024: KPNO Optical Observations
  94. GRB 971024: USNO Observations
  95. GRB 970925: BATSE Localization
  96. IRAS 18119-1342 and the possible new SGR
  97. Possible new SGR from US Naval Observatory
  98. RXTE Observations of SGR 1814-13
  99. GRB 970828: Palomar Observations
  100. GRB 970228: Keck/LRIS Optical Observations

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