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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"

44289 results found.

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

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