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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"

23093 results found.

  1. Optical Observations of GRB981226
  2. GRB 981220:Optical Observations
  3. GRB 981220 optical R and I observations
  4. GRB 981226 - Infrared Observations
  5. GRB 981220
  6. GRB981226 Optical Observation
  7. GRB 981220: BeppoSAX/GRBM results
  8. GRB981220 I-band Observations
  9. GRB 981220
  10. GRB 981220, optical observations
  11. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  12. BeppoSAX NFI Observation of GRB980425
  13. SGR1900+14, BeppoSAX-GRBM observations
  14. GRB980519, Optical Observations
  15. GRB980703, Host galaxy multicolor photometry
  16. GRB980703 - BeppoSAX/GRBM detection
  17. GRB980703 optical photometry
  18. GRB 980703: BATSE Observations
  19. GRB980703 optical observations
  20. GRB980703 H-band Observations
  21. GRB980703 Transient Optical Follow-Up
  22. GRB 980703
  23. GRB980703 (I band observations)
  24. GRB 980703 H-band Observations
  25. GRB980703 (optical R observations)
  26. GRB980703: radio source/optical transient
  27. BeppoSAX NFI observations of GRB 980703
  28. GRB 980703: ASM Position & Intensity
  29. GRB980519 observation report
  30. SGR1900+14 field optical observations
  31. GRB 980613 Near-IR observations
  32. GRB980613, optical observations
  33. SGR1627-41, RXTE/ASM observations
  34. SGR1627-41, Refined IPN annulus location
  35. Reduced error box of SGR 1627-41
  36. GRB 980613: BATSE Observations
  37. SGR1627-41, BeppoSAX-GRBM detections
  38. GRB 980613 Optical Observations
  39. Discovery of a new SGR source, SGR1627-41
  40. GRB980613 observations from Palomar
  41. GRB 980613 new optical/IR observations
  42. GRB 980613 optical/IR obs.
  43. GRB980613 Near Infra-Red Observations
  44. GRB971214 Secondary Standards
  45. SGR 1900+14
  46. SGR1900+14
  47. SGR1900+14
  48. GRB980519 optical observations
  49. GRB980519 Optical Observations
  50. GRB980519 optical observations
  51. GRB980515, BeppoSAX IAUC to be submitted
  52. GRB 980425 Radio Light Curve
  53. GRB 980425 Brightness Temperature
  54. GRB980425 BATSE observations
  55. GRB980425: Radio Observations
  56. GRB 980425 optical observations
  57. report on BSAX observations of GRB980425
  58. GRB 980425 optical observations
  59. GRB980326, optical observations
  60. GRB980329, Fading IR counterpart to radio source
  61. GRByymmdd, Announcement of automation
  62. GRB980326 IPN annulus
  63. GRB980329
  64. GRB980329 IPN annulus
  65. GRB980329 optical observations
  66. GRB980329 near-IR observations
  67. GRB980329 near-IR observations
  68. GRB980329 optical observations
  69. GRB980329 infrared observations
  70. GRB980329 optical observations
  71. GRB980326 optical observations
  72. GRB980329 optical observations
  73. GRB980329 near IR observations
  74. GRB980329 optical observations
  75. GRB980329 optical observations
  76. GRB980329 optical observations
  77. GRB980326 optical observations
  78. GRB970508 SAO RAS optical observations
  79. Near-IR follow-up on GRB 971227
  80. GRB971227: Plaskett R-band observations
  81. GRB 971227: Optical clarifications
  82. GRB971227: Further CAHA R-band images
  83. GRB971227: LOTIS observations
  84. GRB 971227: CAHA R-band images
  85. GRB971214: Optical Observations and Calibrations
  86. GRB 971214: EUVE Observations
  87. GRB 971214: Redshift from Keck Optical Observations
  88. GRB 971214: Redshift from Keck Optical Observations
  89. Optical Observations of GRB 971214 at Keck
  90. GRB 971214: Optical Observations
  91. GRB 971024: Refined analysis by USNOFS Observations
  92. GRB 971024: USNO Observations
  93. IRAS 18119-1342 and the possible new SGR

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