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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"

44618 results found.

  1. Reduced error box of SGR 1627-41
  2. GRB 980613: BATSE Observations
  3. SGR1627-41, BeppoSAX-GRBM detections
  4. SGR 1627-41
  5. GRB 980613 Optical Observations
  6. GRB 980613 optical observations
  7. Discovery of a new SGR source, SGR1627-41
  8. GRB980613 Optical Observations
  9. GRB980613 observations from Palomar
  10. GRB980613 BeppoSAX-NFI follow up
  11. GRB 980613 new optical/IR observations
  12. GRB 980613 optical/IR obs.
  13. GRB980613 Near Infra-Red Observations
  14. GRB980611
  15. GRB980613, BeppoSAX WFC positions
  16. GRB971214 Secondary Standards
  17. SGR 1900+14
  18. GRB980519 Secondary Standards
  19. SGR1900+14
  20. SGR1900+14
  21. BATSE on-board GRB trigger change
  22. GRB 980519 Optical Observations
  23. GRB980519 optical observations
  24. GRB980519 I-band observations
  25. GRB 980519
  26. GRB980519 optical observations
  27. GRB 980519 Optical Observations
  28. GRB980519 BATSE Observations
  29. GRB970519, optical follow-up at Schmidt Calern
  30. GRB980519 optical observations
  31. GRB980519 Optical Observations
  32. GRB980519 Optical Observations
  33. GRB980519 IPN POSITION
  34. GRB980519 Optical Observations
  35. GRB 980519 Optical Observations
  36. GRB980519 optical observations
  37. GRB980515, BeppoSAX IAUC to be submitted
  38. BATSE on-board GRB trigger change
  39. GRB980519, BeppoSAX-WFC updated position
  40. GRB980519, BeppoSAX-WFC position
  41. GRB980515: SAX-WFC updated position
  42. BeppoSAX GRB ALERT: updated position of grb980515
  43. GRB 980425 Radio Light Curve
  44. GRB 980425 Brightness Temperature
  45. BSAX Observations of GRB980425 field
  46. IPN web site of GRBs
  47. GRB980425 BATSE observations
  48. SAX J0840.7+2248 Optical Observations
  49. GRB 980425 optical observations
  50. GRB980425: optical obs.
  51. GRB980425: Radio Observations
  52. GRB 980425 optical observations
  53. report on BSAX observations of GRB980425
  54. GRB 980425 optical observations
  55. GRB 980329 ROSAT observation
  56. GRB980326 X-ray Observations
  57. GRB980326, optical observations
  58. GRB980326, optical observations
  59. GRB980329, Fading IR counterpart to radio source
  60. GRByymmdd, Announcement of automation
  61. GRB980326 IPN annulus
  62. GRB980329
  63. GRB980329 Keck K-band observations
  64. GRB980329 sub-millimeter observations
  65. GRB980329 IPN annulus
  66. GRB980329 optical observations
  67. GRB980329 near-IR observations
  68. GRB980329 near-IR observations
  69. GRB980329 optical observations
  70. GRB980329 infrared observations
  71. GRB980329 optical observations
  72. GRB980326 optical observations
  73. GRB980329 optical observations
  74. GRB980329 VLA observations
  75. GRB980329 near IR observations
  76. GRB980329 optical observations
  77. GRB980329 optical observations
  78. GRB980329 optical observations
  79. GRB980326 optical observations
  80. GRB980326 optical observations
  81. GRB980326 optical observations
  82. GRB980326 optical observations
  83. GRB970508 SAO RAS optical observations
  84. Optical Observations of GRB 970508
  85. GRB 971214: Redshift from Keck Observations
  86. Near-IR follow-up on GRB 971227
  87. GRB971214: Keck R & I-band Observations
  88. GRB 971227: Optical Observations
  89. Optical Observations of the GRB 971227 field
  90. Optical Observations on GRB 971227
  91. GRB971227: Plaskett R-band observations
  92. GRB 971227: Optical clarifications
  93. Optical Observations for GRB 971227
  94. GRB971227: Further CAHA R-band images
  95. GRB971227: LOTIS observations
  96. GRB 971227: CAHA R-band images
  97. GRB 971227: Optical observations
  98. GRB971214: Optical Observations and Calibrations
  99. Sub-millimeter Observations of GRB 971214 at the JCMT
  100. GRB 971214: EUVE Observations

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