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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"

38302 results found.

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

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