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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').

31192 results found.

  1. GRB 980613: BATSE Observations
  2. GRB 980613 Optical Observations
  3. GRB 980613 optical observations
  4. GRB980613 Optical Observations
  5. GRB980613 observations from Palomar
  6. GRB980613 BeppoSAX-NFI follow up
  7. GRB 980613 new optical/IR observations
  8. GRB 980613 optical/IR obs.
  9. GRB980613 Near Infra-Red Observations
  10. GRB980611
  11. GRB980613, BeppoSAX WFC positions
  12. GRB971214 Secondary Standards
  13. GRB980519 Secondary Standards
  14. BATSE on-board GRB trigger change
  15. GRB 980519 Optical Observations
  16. GRB980519 optical observations
  17. GRB 980519
  18. GRB980519 optical observations
  19. GRB 980519 Optical Observations
  20. GRB980519 BATSE Observations
  21. GRB970519, optical follow-up at Schmidt Calern
  22. GRB980519 optical observations
  23. GRB980519 Optical Observations
  24. GRB980519 Optical Observations
  25. GRB980519 IPN POSITION
  26. GRB980519 Optical Observations
  27. GRB 980519 Optical Observations
  28. GRB980519 optical observations
  29. GRB980515, BeppoSAX IAUC to be submitted
  30. BATSE on-board GRB trigger change
  31. BeppoSAX GRB ALERT: updated position of grb980515
  32. GRB 980425 Radio Light Curve
  33. GRB 980425 Brightness Temperature
  34. GRB980425 BATSE observations
  35. SAX J0840.7+2248 Optical Observations
  36. GRB 980425 optical observations
  37. GRB980425: optical obs.
  38. GRB980425: Radio Observations
  39. GRB 980425 optical observations
  40. GRB 980425 optical observations
  41. GRB 980329 ROSAT observation
  42. GRB980326 X-ray Observations
  43. GRB980326, optical observations
  44. GRB980326, optical observations
  45. GRB980329, Fading IR counterpart to radio source
  46. GRByymmdd, Announcement of automation
  47. GRB980326 IPN annulus
  48. GRB980329 sub-millimeter observations
  49. GRB980329 IPN annulus
  50. GRB980329 near-IR observations
  51. GRB980326 optical observations
  52. GRB980329 optical observations
  53. GRB980329 VLA observations
  54. GRB980329 near IR observations
  55. GRB980329 optical observations
  56. GRB980329 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. Sub-millimeter Observations of GRB 971214 at the JCMT
  75. GRB 971214: EUVE Observations
  76. GRB 971214: Redshift from Keck Optical Observations
  77. GRB 971214: Redshift from Keck Optical Observations
  78. GRB 971214: Apache Point Observatory Optical Observations
  79. GRB 971214: KPNO Optical Observations
  80. Optical Observations of GRB 971214 at Keck
  81. GRB 971214: Optical Observations
  82. Radio Observations of GRB 971214 at the VLA
  83. GRB 971214: USNOFS Observations Summary
  84. GRB 971024: KPNO Optical Observations Summary
  85. GRB 971024: Refined analysis by USNOFS Observations
  86. GRB 971024: KPNO Optical Observations
  87. GRB 971024: USNO Observations
  88. GRB 970925: BATSE Localization
  89. IRAS 18119-1342 and the possible new SGR
  90. Possible new SGR from US Naval Observatory
  91. GRB 970828: Palomar Observations
  92. GRB 970228: Keck/LRIS Optical Observations

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