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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"

41619 results found.

  1. GRB000615, R-band photometry
  2. GRB980425, HST/STIS observations of the host galaxy
  3. GRB000615: BeppoSAX GRB Alert
  4. The Hosts of GRB 980703 and GRB 971214
  5. GRB 000301C: Further Late-Time HST/STIS observations
  6. GRB000528: follow-up X-ray measurements and update of IPN annulus
  7. Optical Follow-up of GRB000529 Error Box
  8. GRB980519, HST/STIS observations of the host galaxy
  9. GRB000607, Radio Observations
  10. BeppoSAX X-ray transient/possible GRB000608
  11. GRB000604 optical non-detection
  12. GRB000604 - Optical observations
  13. GRB000604, optical observations
  14. GRB000528, optical observations at ESO
  15. GRB 000604 optical observations
  16. GRB 000418: Detection of the Host Galaxy
  17. GRB000604, optical observations, comparison with DPOSS
  18. GRB000528, Radio Observations
  19. X-ray Afterglow of GRB 000529
  20. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  21. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  22. GRB000529: Optical Observations
  23. IPN localization and time history of GRB000528
  24. GRB000519: Optical observations
  25. IPN localization of GRB000529
  26. GRB 000528 - WFC measurements
  27. GRB000529: BeppoSAX WFC position
  28. GRB000528: BeppoSAX GRBM observations
  29. GRB 000528 Optical Observations
  30. GRB000519, BVRI field photometry
  31. Re: GRB000508B : Optical observations
  32. GRB 000418, Optical observation
  33. GRB000508B, optical photometry
  34. GRB000508B, BVR field photometry
  35. Possible GRB-related phenomenon
  36. RXTE/ASM and IPN localization of GRB 000508B
  37. GRB000424, UBVRI field photometry
  38. GRB 000424 Optical Observations
  39. GRB000418, UBVRI field photometry update
  40. The redshift of GRB 000418
  41. GRB000424, optical observations
  42. GRB 000429, optical observation
  43. GRB 000429, UBVRI field photometry
  44. IPN localization of GRB000429
  45. GRB 000418, UBVRI field photometry
  46. GRB000418, Radio detection
  47. GRB000418, K'-band photometry
  48. GRB 000418, Optical Observation
  49. GRB 000418, optical observation
  50. GRB000424 Optical Observations
  51. GRB 000418, Optical Observation
  52. GRB000424, optical observations
  53. GRB000424, optical observations
  54. GRB 000424, Optical Observations
  55. GRB 000418, Optical Observation
  56. GRB000418, near-infrared observations
  57. BeppoSAX GRB000424
  58. Correction to IPN error box for GRB000419
  59. GRB000416 Optical Observations
  60. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  61. GRB000416 BRJK observations
  62. 1SAXJ1715.0-7134 refined position
  63. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  64. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  65. Budget cuts in BeppoSAX operations: impact on GRB observations
  66. GRB 000408, optical observations
  67. GRB 991208, UBVRI field photometry
  68. GRB000301c results
  69. GRB000408: Optical CCD Observations from MIRO
  70. GRB000408, lotis optical observations
  71. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  72. GRB000408 [IPN Position]
  73. GRB000326 Optical Observations
  74. GRB000301C - R magnitude lower limit
  75. GRB000326, Further VLA observations
  76. GRB 000323, optical observations
  77. GRB 000326: Optical Observations
  78. GRB000326, Radio observations
  79. GRB 000307 optical observations
  80. GRB000313, Radio observations
  81. GRB 000313 - optical transient in the BATSE error box
  82. GRB000301C - B and R photometry
  83. GRB000301C - R photometry
  84. GRB 000307, Optical Observations
  85. GRB 000307, BVRI Field Photometry
  86. GRB 000301C: Optical Spectrum and Redshift
  87. GRB 000301C: Optical Spectrum and Redshift
  88. GRB 000301C: A Precise Redshift Determination
  89. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  90. GRB 000301C: HST/STIS CCD Imaging of the field
  91. GRB 000301c: K' observations
  92. GRB000301C, optical R-band observations
  93. GRB000301c - R photometry and nearby faint source confirmation
  94. GRB 000301C, Optical Observation
  95. GRB 000301c: K' observations
  96. GRB 000301C Optical Observations
  97. GRB 000301C: K' Observations
  98. GRB000301C OT candidate optical observations
  99. GRB000301C - Host galaxy not detected in R (?)
  100. Optical observations of GRB000301c

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