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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"

37503 results found.

  1. GRB980703 (optical R observations)
  2. GRB980706
  3. GRB980703: radio source/optical transient
  4. BeppoSAX NFI observations of GRB 980703
  5. GRB 980703: ASM Position & Intensity
  6. GRB980703
  7. GRB980703 optical followup
  8. GRB 980613 Near-IR observations
  9. GRB980613, optical observations
  10. GRB 980613: Optical transient and its host galaxy
  11. GRB 980613: Detection of the probable host galaxy
  12. GRB 980613: BATSE Observations
  13. GRB 980613 Optical Observations
  14. GRB 980613 optical observations
  15. GRB980613 Optical Observations
  16. GRB980613 observations from Palomar
  17. GRB980613 BeppoSAX-NFI follow up
  18. GRB 980613 new optical/IR observations
  19. GRB 980613 optical/IR obs.
  20. GRB980613 Near Infra-Red Observations
  21. GRB980611
  22. GRB980613, BeppoSAX WFC positions
  23. GRB971214 Secondary Standards
  24. GRB980519 Secondary Standards
  25. BATSE on-board GRB trigger change
  26. GRB 980519 Optical Observations
  27. GRB980519 optical observations
  28. GRB 980519
  29. GRB980519 optical observations
  30. GRB 980519 Optical Observations
  31. GRB980519 BATSE Observations
  32. GRB970519, optical follow-up at Schmidt Calern
  33. GRB980519 optical observations
  34. GRB980519 Optical Observations
  35. GRB980519 Optical Observations
  36. GRB980519 IPN POSITION
  37. GRB980519 Optical Observations
  38. GRB 980519 Optical Observations
  39. GRB980519 optical observations
  40. GRB980515, BeppoSAX IAUC to be submitted
  41. BATSE on-board GRB trigger change
  42. BeppoSAX GRB ALERT: updated position of grb980515
  43. GRB 980425 Radio Light Curve
  44. GRB 980425 Brightness Temperature
  45. GRB980425 BATSE observations
  46. SAX J0840.7+2248 Optical Observations
  47. GRB 980425 optical observations
  48. GRB980425: optical obs.
  49. GRB980425: Radio Observations
  50. GRB 980425 optical observations
  51. GRB 980425 optical observations
  52. GRB 980329 ROSAT observation
  53. GRB980326 X-ray Observations
  54. GRB980326, optical observations
  55. GRB980326, optical observations
  56. GRB980329, Fading IR counterpart to radio source
  57. GRByymmdd, Announcement of automation
  58. GRB980326 IPN annulus
  59. GRB980329 sub-millimeter observations
  60. GRB980329 IPN annulus
  61. GRB980329 near-IR observations
  62. GRB980326 optical observations
  63. GRB980329 optical observations
  64. GRB980329 VLA observations
  65. GRB980329 near IR observations
  66. GRB980329 optical observations
  67. GRB980329 optical observations
  68. GRB980326 optical observations
  69. GRB980326 optical observations
  70. GRB970508 SAO RAS optical observations
  71. Optical Observations of GRB 970508
  72. GRB 971214: Redshift from Keck Observations
  73. Near-IR follow-up on GRB 971227
  74. GRB971214: Keck R & I-band Observations
  75. GRB 971227: Optical Observations
  76. Optical Observations of the GRB 971227 field
  77. Optical Observations on GRB 971227
  78. GRB971227: Plaskett R-band observations
  79. GRB 971227: Optical clarifications
  80. Optical Observations for GRB 971227
  81. GRB971227: Further CAHA R-band images
  82. GRB971227: LOTIS observations
  83. GRB 971227: CAHA R-band images
  84. GRB 971227: Optical observations
  85. Sub-millimeter Observations of GRB 971214 at the JCMT
  86. GRB 971214: EUVE Observations
  87. GRB 971214: Redshift from Keck Optical Observations
  88. GRB 971214: Redshift from Keck Optical Observations
  89. GRB 971214: Apache Point Observatory Optical Observations
  90. GRB 971214: KPNO Optical Observations
  91. Optical Observations of GRB 971214 at Keck
  92. GRB 971214: Optical Observations
  93. Radio Observations of GRB 971214 at the VLA
  94. GRB 971214: USNOFS Observations Summary
  95. GRB 971024: KPNO Optical Observations Summary
  96. GRB 971024: Refined analysis by USNOFS Observations
  97. GRB 971024: KPNO Optical Observations
  98. GRB 971024: USNO Observations
  99. GRB 970925: BATSE Localization
  100. IRAS 18119-1342 and the possible new SGR

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