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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"

7397 results found.

  1. GRB010126 Optical Observations
  2. GRB 001204: Ks observations
  3. GRB 001212 possible OA in 2MASS
  4. GRB001204: Optical observations
  5. GRB001120: Gunn-i observations
  6. GRB001120: Optical observations
  7. GRB 001109: deep JHK upper limits
  8. GRB001007: Optical observations
  9. GRB001007, Radio observations
  10. GRB 001007, BVR-band observations
  11. GRB000911: VLT infrared observation
  12. GRB000911: optical VLT observations
  13. GRB000926 K'-band Observation
  14. J and K band observations of GRB 000926
  15. GRB000911 Optical Observations
  16. GRB 000926, optical observation by Oksanen (vsnet-grb)
  17. GRB000926: Optical observations
  18. GRB 000926, Optical Observation
  19. GRB000926, radio observations
  20. GRB 000926: Optical candidate
  21. Optical candidate for GRB000926
  22. GRB000911: Corrected coordinates
  23. GRB000911: Optical Transient
  24. GRB000911, Radio and Optical observations
  25. GRB000911: Optical observations
  26. GRB000830: Optical observations
  27. Chandra Position of GRB000210
  28. GRB000830: Optical observations
  29. HST/STIS observations of the host galaxy of GRB 980329
  30. GRB000630, Optical Observations
  31. GRB000630, optical observations
  32. GRB000630, optical observations
  33. GRB000630: Optical observations
  34. possible optical counterpart of GRB 000630
  35. GRB000604 - Optical observations
  36. GRB000604, optical observations
  37. X-ray Afterglow of GRB 000529
  38. GRB000529: Optical Observations
  39. GRB000519: Optical observations
  40. GRB 000528 Optical Observations
  41. GRB 000418, Optical observation
  42. GRB 000418, Optical Observation
  43. GRB 000418, optical observation
  44. GRB 000418, Optical Observation
  45. GRB 000418, Optical Observation
  46. GRB 000408, optical observations
  47. GRB000301C - R magnitude lower limit
  48. GRB 000307 optical observations
  49. GRB000301C - B and R photometry
  50. GRB000301C - R photometry
  51. GRB 000301c: K' observations
  52. GRB000301C, optical R-band observations
  53. GRB000301c - R photometry and nearby faint source confirmation
  54. GRB 000301c: K' observations
  55. GRB 000301C: K' Observations
  56. GRB000301C OT candidate optical observations
  57. GRB000301C - Host galaxy not detected in R (?)
  58. GRB000301C optical observations
  59. GRB 000301c near-IR observations
  60. GRB000301C, optical observations
  61. GRB000301C, near-infrared observations (JHK' photometry)
  62. GRB 000301C: OT confirmed
  63. GRB000301c optical observations
  64. GRB000301C, optical observations
  65. GRB 000301C : Optical Candidate
  66. GRB000214: X-ray afterglow candidate
  67. Optical candidate for GRB000210
  68. GRB 000115 Optical observations
  69. GRB 991216: J band spectrophotometry
  70. GRB 991208 Keck Spectroscopy
  71. GRB 991208 optical observations
  72. GRB 991208: Radio Observations
  73. GRB991106: BeppoSAX/BATSE results
  74. GRB 990510: optical observations
  75. GRB 990510: optical observations
  76. GRB981220 VLBA observations
  77. GRB 990316, Radio observations
  78. GRB 990316, Optical observations
  79. GRB990316, Optical observations
  80. GRB 990316 optical observations
  81. GRB 981220, radio observations
  82. GRB990123, Optical observation
  83. GRB990123 Optical Observation
  84. GRB 981226 Optical Observations
  85. GRB981226 Optical Observations
  86. GRB 981226 optical observations
  87. GRB980425 Optical Follow-up
  88. GRB 980703 H-band Observations
  89. SGR1900+14 field optical observations
  90. Reduced error box of SGR 1627-41
  91. GRB980613 Near Infra-Red Observations
  92. GRB980519 Optical Observations
  93. GRB980515, BeppoSAX IAUC to be submitted
  94. GRB 980425 Radio Light Curve
  95. GRB 980425 Brightness Temperature
  96. GRB980425: Radio Observations
  97. GRB 971214: KPNO Optical Observations

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