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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"

32495 results found.

  1. Optical Observations of the Host Galaxy of GRB 980519
  2. GRB980519, Optical Observations
  3. GRB980703, Host galaxy multicolor photometry
  4. GRB 980703 (NFI observations)
  5. GRB980703 optical photometry
  6. GRB 980703: BATSE Observations
  7. GRB980703 optical observations
  8. GRB980703: Radio transient
  9. GRB980703 H-band Observations
  10. GRB 980703: Spectrum of the proposed optical counterpart
  11. RXTE Observation of GRB 980706
  12. GRB980703: Spectrum of the proposed optical counterpart
  13. GRB980703 Transient Optical Follow-Up
  14. GRB980703: LOTIS observation at early times
  15. GRB980613 Optical Observations
  16. GRB 980703
  17. GRB980703 (I band observations)
  18. GRB 980703 H-band Observations
  19. GRB980703: radio source/optical transient
  20. BeppoSAX NFI observations of GRB 980703
  21. GRB980519 observation report
  22. Radio observations of SGRs
  23. GRB 980613 Near-IR observations
  24. GRB980613, optical observations
  25. GRB 980613: Optical transient and its host galaxy
  26. SGR1627-41, RXTE/ASM observations
  27. SGR1627-41, Refined IPN annulus location
  28. GRB 980613: Detection of the probable host galaxy
  29. Reduced error box of SGR 1627-41
  30. SGR1627-41, BeppoSAX-GRBM detections
  31. GRB 980613 Optical Observations
  32. GRB 980613 optical observations
  33. GRB980613 Optical Observations
  34. GRB980613 observations from Palomar
  35. GRB 980613 new optical/IR observations
  36. GRB971214 Secondary Standards
  37. GRB980519 Secondary Standards
  38. SGR1900+14
  39. GRB 980519 Optical Observations
  40. GRB980519 optical observations
  41. GRB980519 I-band observations
  42. GRB 980519
  43. GRB980519 optical observations
  44. GRB 980519 Optical Observations
  45. GRB980519 BATSE Observations
  46. GRB970519, optical follow-up at Schmidt Calern
  47. GRB980519 optical observations
  48. GRB980519 Optical Observations
  49. GRB980519 Optical Observations
  50. GRB980519 IPN POSITION
  51. GRB980519 Optical Observations
  52. GRB 980519 Optical Observations
  53. GRB980519 optical observations
  54. GRB980515, BeppoSAX IAUC to be submitted
  55. GRB980519, BeppoSAX-WFC updated position
  56. GRB 980425 Radio Light Curve
  57. GRB 980425 Brightness Temperature
  58. BSAX Observations of GRB980425 field
  59. IPN web site of GRBs
  60. GRB980425 BATSE observations
  61. SAX J0840.7+2248 Optical Observations
  62. GRB 980425 optical observations
  63. GRB980425: optical obs.
  64. GRB980425: Radio Observations
  65. GRB 980425 optical observations
  66. GRB980326, optical observations
  67. GRB980326, optical observations
  68. GRB980329, Fading IR counterpart to radio source
  69. GRByymmdd, Announcement of automation
  70. GRB980326 IPN annulus
  71. GRB980329
  72. GRB980329 Keck K-band observations
  73. GRB980329 sub-millimeter observations
  74. GRB980329 IPN annulus
  75. GRB980329 optical observations
  76. GRB980329 near-IR observations
  77. GRB980329 optical observations
  78. GRB980326 optical observations
  79. GRB980326 optical observations
  80. GRB970508 SAO RAS optical observations
  81. GRB 971214: Redshift from Keck Observations
  82. Near-IR follow-up on GRB 971227
  83. GRB971214: Keck R & I-band Observations
  84. GRB 971227: Optical Observations
  85. Optical Observations of the GRB 971227 field
  86. GRB971227: Plaskett R-band observations
  87. GRB 971227: Optical clarifications
  88. GRB971227: LOTIS observations
  89. GRB971214: Optical Observations and Calibrations
  90. Optical Observations of GRB 971214 at Keck
  91. GRB 971024: Refined analysis by USNOFS Observations
  92. GRB 971024: USNO Observations
  93. GRB 970925: BATSE Localization
  94. IRAS 18119-1342 and the possible new SGR
  95. GRB 970228: Keck/LRIS Optical Observations

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