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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"

27396 results found.

  1. GRB010222: BeppoSAX/NFI Observations
  2. GRB010214B,Gamma Ray Observations
  3. GRB 010220, simultaneous optical observations
  4. GRB010220: BeppoSAX WFC and GRBM preliminary data
  5. GRB010214, candidate optical afterglow
  6. GRB010214, optical observations
  7. GRB010214: BeppoSAX WFC and GRBM preliminary data
  8. GRB 010214: X-Ray afterglow
  9. GRB 010214 optical observation
  10. GRB010213, Radio Observations
  11. J-Band Observation of GRB 010214.
  12. GRB010213, Near-IR observations
  13. Possible InfraRed Transient of GRB 010214.
  14. GRB 010214, optical observations
  15. GRB010213 detected by HETE
  16. IPN Status Report
  17. HETE Status
  18. IPN/RXTE TRIANGULATION OF GRB010126
  19. GRB010126 Optical Observations
  20. IPN TRIANGULATION OF GRB010126
  21. Optical Observations of GRB 001018 at Keck
  22. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)
  23. Optical observations of GRB 001018 with JCAM
  24. IPN TRIANGULATION OF GRB010115
  25. IPN TRIANGULATION OF GRB010109
  26. IPN TRIANGULATION OF GRB010109
  27. IPN triangulation of GRB010104
  28. IPN triangulation of GRB010103
  29. H band observation of GRB 001212
  30. IPN triangulation of GRB001219
  31. GRB 001212 Optical Observation
  32. GRB 001212 Optical Observation
  33. GRB 001212 possible OA in 2MASS
  34. IPN triangulation of GRB001212
  35. Confirmation of IPN position for GRB001204
  36. IPN triangulation of GRB001204 (short/hard)
  37. GRB001120, optical observations
  38. WSRT 4.8 GHz observations of GRB001109
  39. IPN triangulation of GRB001120
  40. GRB 001109: deep JHK upper limits
  41. GRB 001109 X-ray afterglow with BeppoSAX
  42. CORRECTION to XMM-Newton observation of GRB001025
  43. GRB001109, Radio observations
  44. GRB001105 BVRI field photometry correction
  45. GRB001105, BVRI field photometry
  46. IPN TRIANGULATION OF GRB001105
  47. GRB 001025B, Optical obervations
  48. GRB 991208: HST Imaging of the Host Galaxy
  49. GRB 001025B, I-band observations
  50. XMM-Newton observation of GRB001025
  51. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  52. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  53. GRB001007: Optical observations
  54. ASM Localization of GRB 001025
  55. GRB001007, Radio observations
  56. GRB 001018, Possible Radio Afterglow
  57. GRB001018, Gamma Ray Observations
  58. IPN TRIANGULATION OF GRB001019
  59. IPN TRIANGULATION OF GRB001018
  60. IPN TRIANGULATION OF GRB 001017
  61. V,R,I band observations of GRB000926
  62. HETE positions added to GCN
  63. GRB000926 - Amateur Optical Observations
  64. CONCAM null result on GRB001005
  65. IPN triangulation of GRB001005
  66. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  67. GRB000926 - Optical observations
  68. GRB000926 - Optical observations
  69. GRB 000926, Optical Decay
  70. GRB000911: VLT infrared observation
  71. GRB 000926, Optical Observations
  72. GRB000926 K'-band Observation
  73. J and K band observations of GRB 000926
  74. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  75. CONCAM crude optical limits before and after GRB000926
  76. GRB 000926: Preliminary R-band Lightcurve
  77. Spectroscopic Redshift of GRB 000926
  78. GRB 000926: Optical candidate
  79. Optical candidate for GRB000926
  80. GRB 000911, BVRI field photometry
  81. GRB000911, Radio and Optical observations
  82. GRB000911: Optical observations
  83. GRB000830, BVRI field photometry
  84. GRB000210, Optical observations
  85. "Snapshot" afterglow IDs and GRB 000830
  86. GRB000730, Gamma Ray Observations
  87. GRB000812, Radio observations
  88. GRB000801, Gamma Ray Observations
  89. GRB000801, VLT-Antu R-band observations
  90. GRB 991208 Host Galaxy Imaging
  91. IPN localization of GRB000730B
  92. GRB 990510: Possible detection of a host galaxy
  93. GRB 990510 Host Galaxy Discovery
  94. IPN localization of GRB000727
  95. GRB 990712: Late time HST/STIS Observations
  96. GRB 991216, HST/STIS observations
  97. GRB000620, Radio Observations
  98. GRB000630, optical observations
  99. GRB000630, Revised BVRI Field Photometry
  100. GRB000630, Optical Observations

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