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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"

20948 results found.

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

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