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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"

37518 results found.

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

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