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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"

20949 results found.

  1. possible optical counterpart of GRB 000630
  2. GRB 000623, optical observations
  3. GRB 000620, optical observations
  4. GRB000418, HST/STIS Observations
  5. GRB990123: Late-time HST/STIS observations of the host
  6. GRB 990506, HST/STIS Observations of the Host Galaxy
  7. GRB 000620: J-band observations
  8. GRB000620, optical observations
  9. GRB000615: H-band observations
  10. GRB990308, HST/STIS observations of the host galaxy
  11. GRB000620 - Optical observations
  12. GRB000620 Optical observations
  13. GRB000615, Radio observations
  14. GRB000607, optical observations
  15. GRB 000615: NIR further observations
  16. GRB990123, HST/STIS observations of the host galaxy
  17. GRB000616 optical observations
  18. GRB 000615, near-infrared observations
  19. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  20. GRB000615, further R-band photometry
  21. GRB 000615: NIR observations
  22. GRB000615, R-band photometry
  23. GRB980425, HST/STIS observations of the host galaxy
  24. GRB 000301C: Further Late-Time HST/STIS observations
  25. GRB980519, HST/STIS observations of the host galaxy
  26. GRB000607, Radio Observations
  27. GRB000604 - Optical observations
  28. GRB000604, optical observations
  29. GRB000528, optical observations at ESO
  30. GRB 000604 optical observations
  31. GRB 000418: Detection of the Host Galaxy
  32. GRB000604, optical observations, comparison with DPOSS
  33. GRB000528, Radio Observations
  34. GRB000529: Optical Observations
  35. GRB000519: Optical observations
  36. GRB000528: BeppoSAX GRBM observations
  37. GRB 000528 Optical Observations
  38. Re: GRB000508B : Optical observations
  39. GRB000508B, optical photometry
  40. Possible GRB-related phenomenon
  41. GRB 000424 Optical Observations
  42. The redshift of GRB 000418
  43. GRB000424, optical observations
  44. GRB000424 Optical Observations
  45. GRB000424, optical observations
  46. GRB000424, optical observations
  47. GRB 000424, Optical Observations
  48. GRB 000418, Optical Observation
  49. GRB000418, near-infrared observations
  50. GRB000416 Optical Observations
  51. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  52. GRB000416 BRJK observations
  53. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  54. Budget cuts in BeppoSAX operations: impact on GRB observations
  55. GRB 000408, optical observations
  56. GRB000408: Optical CCD Observations from MIRO
  57. GRB000408, lotis optical observations
  58. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  59. GRB000326 Optical Observations
  60. GRB000301C - R magnitude lower limit
  61. GRB000326, Further VLA observations
  62. GRB 000323, optical observations
  63. GRB 000326: Optical Observations
  64. GRB000326, Radio observations
  65. GRB 000307 optical observations
  66. GRB000313, Radio observations
  67. GRB 000313 - optical transient in the BATSE error box
  68. GRB 000307, Optical Observations
  69. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  70. GRB 000301C: HST/STIS CCD Imaging of the field
  71. GRB 000301c: K' observations
  72. GRB000301C, optical R-band observations
  73. GRB000301c - R photometry and nearby faint source confirmation
  74. GRB 000301C, Optical Observation
  75. GRB 000301c: K' observations
  76. GRB 000301C Optical Observations
  77. GRB 000301C: K' Observations
  78. GRB000301C OT candidate optical observations
  79. GRB000301C - Host galaxy not detected in R (?)
  80. Optical observations of GRB000301c
  81. GRB000301C, Radio observations
  82. GRB000301C, Radio observations
  83. GRB000301C optical observations
  84. GRB000301C, near-infrared observations (JHK' imaging)
  85. GRB 000301c near-IR observations
  86. GRB000301C, optical observations
  87. GRB000301C, near-infrared observations (JHK' photometry)
  88. GRB000301c optical observations
  89. GRB 000301A, Radio Observations
  90. GRB000301C, optical observations
  91. GRB000301c, near-infrared observations
  92. Radio observations of the error box of GRB000301A
  93. HST Observations of GRB 990712
  94. GRB 000214 near-IR observations
  95. GRB 000115 Optical observations
  96. GRB 000214, Radio Observations
  97. GRB000210, Radio Observations
  98. Optical observations of GRB000210
  99. GRB 000210: BATSE Observations
  100. Optical observations of the Chandra X-ray source for GRB000210

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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