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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"

37506 results found.

  1. GRB980613 Optical Observations
  2. GRB 980703
  3. GRB 980703 H-band Observations
  4. GRB980703 (optical R observations)
  5. GRB980706
  6. GRB980703: radio source/optical transient
  7. BeppoSAX NFI observations of GRB 980703
  8. GRB 980703: ASM Position & Intensity
  9. GRB980703
  10. GRB980703 optical followup
  11. GRB 980613 Near-IR observations
  12. GRB980613, optical observations
  13. GRB 980613: Optical transient and its host galaxy
  14. GRB 980613: Detection of the probable host galaxy
  15. GRB 980613: BATSE Observations
  16. GRB 980613 Optical Observations
  17. GRB 980613 optical observations
  18. GRB980613 Optical Observations
  19. GRB980613 observations from Palomar
  20. GRB980613 BeppoSAX-NFI follow up
  21. GRB 980613 new optical/IR observations
  22. GRB 980613 optical/IR obs.
  23. GRB980613 Near Infra-Red Observations
  24. GRB980611
  25. GRB980613, BeppoSAX WFC positions
  26. GRB971214 Secondary Standards
  27. GRB980519 Secondary Standards
  28. BATSE on-board GRB trigger change
  29. GRB 980519 Optical Observations
  30. GRB980519 optical observations
  31. GRB 980519
  32. GRB980519 optical observations
  33. GRB 980519 Optical Observations
  34. GRB980519 BATSE Observations
  35. GRB970519, optical follow-up at Schmidt Calern
  36. GRB980519 optical observations
  37. GRB980519 Optical Observations
  38. GRB980519 Optical Observations
  39. GRB980519 IPN POSITION
  40. GRB980519 Optical Observations
  41. GRB 980519 Optical Observations
  42. GRB980519 optical observations
  43. GRB980515, BeppoSAX IAUC to be submitted
  44. BATSE on-board GRB trigger change
  45. BeppoSAX GRB ALERT: updated position of grb980515
  46. GRB 980425 Radio Light Curve
  47. GRB 980425 Brightness Temperature
  48. GRB980425 BATSE observations
  49. SAX J0840.7+2248 Optical Observations
  50. GRB 980425 optical observations
  51. GRB980425: optical obs.
  52. GRB980425: Radio Observations
  53. GRB 980425 optical observations
  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 sub-millimeter observations
  63. GRB980329 IPN annulus
  64. GRB980329 near-IR observations
  65. GRB980326 optical observations
  66. GRB980329 optical observations
  67. GRB980329 VLA observations
  68. GRB980329 near IR observations
  69. GRB980329 optical observations
  70. GRB980329 optical observations
  71. GRB980326 optical observations
  72. GRB980326 optical observations
  73. GRB970508 SAO RAS optical observations
  74. Optical Observations of GRB 970508
  75. GRB 971214: Redshift from Keck Observations
  76. Near-IR follow-up on GRB 971227
  77. GRB971214: Keck R & I-band Observations
  78. GRB 971227: Optical Observations
  79. Optical Observations of the GRB 971227 field
  80. Optical Observations on GRB 971227
  81. GRB971227: Plaskett R-band observations
  82. GRB 971227: Optical clarifications
  83. Optical Observations for GRB 971227
  84. GRB971227: Further CAHA R-band images
  85. GRB971227: LOTIS observations
  86. GRB 971227: CAHA R-band images
  87. GRB 971227: Optical observations
  88. Sub-millimeter Observations of GRB 971214 at the JCMT
  89. GRB 971214: EUVE Observations
  90. GRB 971214: Redshift from Keck Optical Observations
  91. GRB 971214: Redshift from Keck Optical Observations
  92. GRB 971214: Apache Point Observatory Optical Observations
  93. GRB 971214: KPNO Optical Observations
  94. Optical Observations of GRB 971214 at Keck
  95. GRB 971214: Optical Observations
  96. Radio Observations of GRB 971214 at the VLA
  97. GRB 971214: USNOFS Observations Summary
  98. GRB 971024: KPNO Optical Observations Summary
  99. GRB 971024: Refined analysis by USNOFS Observations
  100. GRB 971024: KPNO Optical Observations

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