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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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

41602 results found.

  1. GRB980613 BeppoSAX-NFI follow up
  2. GRB 980613 new optical/IR observations
  3. GRB 980613 optical/IR obs.
  4. GRB980613 Near Infra-Red Observations
  5. GRB980613, BeppoSAX WFC positions
  6. GRB971214 Secondary Standards
  7. SGR 1900+14
  8. GRB980519 Secondary Standards
  9. SGR1900+14
  10. SGR1900+14
  11. GRB 980519 Optical Observations
  12. GRB980519 optical observations
  13. GRB980519 I-band observations
  14. GRB 980519
  15. GRB980519 optical observations
  16. GRB 980519 Optical Observations
  17. GRB980519 BATSE Observations
  18. GRB970519, optical follow-up at Schmidt Calern
  19. GRB980519 optical observations
  20. GRB980519 Optical Observations
  21. GRB980519 Optical Observations
  22. GRB980519 IPN POSITION
  23. GRB980519 Optical Observations
  24. GRB 980519 Optical Observations
  25. GRB980519 optical observations
  26. GRB980515, BeppoSAX IAUC to be submitted
  27. GRB980519, BeppoSAX-WFC updated position
  28. GRB980519, BeppoSAX-WFC position
  29. BeppoSAX GRB ALERT: updated position of grb980515
  30. GRB 980425 Radio Light Curve
  31. GRB 980425 Brightness Temperature
  32. BSAX Observations of GRB980425 field
  33. GRB980425 BATSE observations
  34. SAX J0840.7+2248 Optical Observations
  35. GRB 980425 optical observations
  36. GRB980425: optical obs.
  37. GRB980425: Radio Observations
  38. GRB 980425 optical observations
  39. report on BSAX observations of GRB980425
  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. GRB980329
  48. GRB980329 Keck K-band observations
  49. GRB980329 sub-millimeter observations
  50. GRB980329 optical observations
  51. GRB980329 near-IR observations
  52. GRB980329 near-IR observations
  53. GRB980329 optical observations
  54. GRB980329 infrared observations
  55. GRB980329 optical observations
  56. GRB980326 optical observations
  57. GRB980329 optical observations
  58. GRB980329 VLA observations
  59. GRB980329 near IR observations
  60. GRB980329 optical observations
  61. GRB980329 optical observations
  62. GRB980329 optical observations
  63. GRB980326 optical observations
  64. GRB980326 optical observations
  65. GRB980326 optical observations
  66. GRB980326 optical observations
  67. GRB970508 SAO RAS optical observations
  68. Optical Observations of GRB 970508
  69. GRB 971214: Redshift from Keck Observations
  70. Near-IR follow-up on GRB 971227
  71. GRB971214: Keck R & I-band Observations
  72. GRB 971227: Optical Observations
  73. Optical Observations of the GRB 971227 field
  74. Optical Observations on GRB 971227
  75. GRB971227: Plaskett R-band observations
  76. GRB 971227: Optical clarifications
  77. Optical Observations for GRB 971227
  78. GRB971227: Further CAHA R-band images
  79. GRB971227: LOTIS observations
  80. GRB 971227: CAHA R-band images
  81. GRB 971227: Optical observations
  82. GRB971214: Optical Observations and Calibrations
  83. Sub-millimeter Observations of GRB 971214 at the JCMT
  84. GRB 971214: EUVE Observations
  85. GRB 971214: Redshift from Keck Optical Observations
  86. GRB 971214: Redshift from Keck Optical Observations
  87. GRB 971214: Apache Point Observatory Optical Observations
  88. GRB 971214: KPNO Optical Observations
  89. Optical Observations of GRB 971214 at Keck
  90. GRB 971214: Optical Observations
  91. Radio Observations of GRB 971214 at the VLA
  92. GRB 971214: USNOFS Observations Summary
  93. GRB 971024: KPNO Optical Observations Summary
  94. GRB 971024: Refined analysis by USNOFS Observations
  95. GRB 971024: KPNO Optical Observations
  96. GRB 971024: USNO Observations
  97. GRB 970925: BATSE Localization
  98. IRAS 18119-1342 and the possible new SGR
  99. Possible new SGR from US Naval Observatory
  100. RXTE Observations of SGR 1814-13

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