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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"

32793 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. IPN web site of GRBs
  35. GRB980425 BATSE observations
  36. SAX J0840.7+2248 Optical Observations
  37. GRB 980425 optical observations
  38. GRB980425: optical obs.
  39. GRB980425: Radio Observations
  40. GRB 980425 optical observations
  41. GRB 980425 optical observations
  42. GRB 980329 ROSAT observation
  43. GRB980326 X-ray Observations
  44. GRB980326, optical observations
  45. GRB980326, optical observations
  46. GRB980329, Fading IR counterpart to radio source
  47. GRByymmdd, Announcement of automation
  48. GRB980326 IPN annulus
  49. GRB980329 sub-millimeter observations
  50. GRB980329 IPN annulus
  51. GRB980329 near-IR observations
  52. GRB980326 optical observations
  53. GRB980329 optical observations
  54. GRB980329 VLA observations
  55. GRB980329 near IR observations
  56. GRB980329 optical observations
  57. GRB980329 optical observations
  58. GRB980326 optical observations
  59. GRB980326 optical observations
  60. GRB970508 SAO RAS optical observations
  61. Optical Observations of GRB 970508
  62. GRB 971214: Redshift from Keck Observations
  63. Near-IR follow-up on GRB 971227
  64. GRB971214: Keck R & I-band Observations
  65. GRB 971227: Optical Observations
  66. Optical Observations of the GRB 971227 field
  67. Optical Observations on GRB 971227
  68. GRB971227: Plaskett R-band observations
  69. GRB 971227: Optical clarifications
  70. Optical Observations for GRB 971227
  71. GRB971227: Further CAHA R-band images
  72. GRB971227: LOTIS observations
  73. GRB 971227: CAHA R-band images
  74. GRB 971227: Optical observations
  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. GRB 970828: Palomar Observations
  93. GRB 970228: Keck/LRIS Optical Observations

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