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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"

44490 results found.

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

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