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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"

36016 results found.

  1. GRB 980703 (NFI observations)
  2. GRB980703 optical photometry
  3. GRB 980703: BATSE Observations
  4. GRB980703: Radio transient
  5. GRB980703 H-band Observations
  6. GRB 980703: Spectrum of the proposed optical counterpart
  7. RXTE Observation of GRB 980706
  8. GRB980703: Spectrum of the proposed optical counterpart
  9. GRB980703 Transient Optical Follow-Up
  10. GRB980703: LOTIS observation at early times
  11. GRB980613 Optical Observations
  12. GRB 980703
  13. GRB 980703 H-band Observations
  14. GRB980703 (optical R observations)
  15. GRB980706
  16. GRB980703: radio source/optical transient
  17. BeppoSAX NFI observations of GRB 980703
  18. GRB 980703: ASM Position & Intensity
  19. GRB980703
  20. GRB980703 optical followup
  21. GRB 980613 Near-IR observations
  22. GRB980613, optical observations
  23. GRB 980613: Optical transient and its host galaxy
  24. GRB 980613: Detection of the probable host galaxy
  25. GRB 980613: BATSE Observations
  26. GRB 980613 Optical Observations
  27. GRB 980613 optical observations
  28. GRB980613 Optical Observations
  29. GRB980613 observations from Palomar
  30. GRB980613 BeppoSAX-NFI follow up
  31. GRB 980613 new optical/IR observations
  32. GRB 980613 optical/IR obs.
  33. GRB980613 Near Infra-Red Observations
  34. GRB980611
  35. GRB980613, BeppoSAX WFC positions
  36. GRB971214 Secondary Standards
  37. GRB980519 Secondary Standards
  38. BATSE on-board GRB trigger change
  39. GRB 980519 Optical Observations
  40. GRB980519 optical observations
  41. GRB 980519
  42. GRB980519 optical observations
  43. GRB 980519 Optical Observations
  44. GRB980519 BATSE Observations
  45. GRB970519, optical follow-up at Schmidt Calern
  46. GRB980519 optical observations
  47. GRB980519 Optical Observations
  48. GRB980519 Optical Observations
  49. GRB980519 IPN POSITION
  50. GRB980519 Optical Observations
  51. GRB 980519 Optical Observations
  52. GRB980519 optical observations
  53. GRB980515, BeppoSAX IAUC to be submitted
  54. BATSE on-board GRB trigger change
  55. BeppoSAX GRB ALERT: updated position of grb980515
  56. GRB 980425 Radio Light Curve
  57. GRB 980425 Brightness Temperature
  58. GRB980425 BATSE observations
  59. SAX J0840.7+2248 Optical Observations
  60. GRB 980425 optical observations
  61. GRB980425: optical obs.
  62. GRB980425: Radio Observations
  63. GRB 980425 optical observations
  64. GRB 980425 optical observations
  65. GRB 980329 ROSAT observation
  66. GRB980326 X-ray Observations
  67. GRB980326, optical observations
  68. GRB980326, optical observations
  69. GRB980329, Fading IR counterpart to radio source
  70. GRByymmdd, Announcement of automation
  71. GRB980326 IPN annulus
  72. GRB980329 sub-millimeter observations
  73. GRB980329 IPN annulus
  74. GRB980329 near-IR observations
  75. GRB980326 optical observations
  76. GRB980329 optical observations
  77. GRB980329 VLA observations
  78. GRB980329 near IR observations
  79. GRB980329 optical observations
  80. GRB980329 optical observations
  81. GRB980326 optical observations
  82. GRB980326 optical observations
  83. GRB970508 SAO RAS optical observations
  84. Optical Observations of GRB 970508
  85. GRB 971214: Redshift from Keck Observations
  86. Near-IR follow-up on GRB 971227
  87. GRB971214: Keck R & I-band Observations
  88. GRB 971227: Optical Observations
  89. Optical Observations of the GRB 971227 field
  90. Optical Observations on GRB 971227
  91. GRB971227: Plaskett R-band observations
  92. GRB 971227: Optical clarifications
  93. Optical Observations for GRB 971227
  94. GRB971227: Further CAHA R-band images
  95. GRB971227: LOTIS observations
  96. GRB 971227: CAHA R-band images
  97. GRB 971227: Optical observations
  98. Sub-millimeter Observations of GRB 971214 at the JCMT
  99. GRB 971214: EUVE Observations
  100. GRB 971214: Redshift from Keck Optical Observations

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