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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"

26332 results found.

  1. GRB000615, R-band photometry
  2. GRB000615: BeppoSAX GRB Alert
  3. The Hosts of GRB 980703 and GRB 971214
  4. GRB 000301C: Further Late-Time HST/STIS observations
  5. GRB980519, HST/STIS observations of the host galaxy
  6. GRB000607, Radio Observations
  7. BeppoSAX X-ray transient/possible GRB000608
  8. GRB000604 - Optical observations
  9. GRB000607, A SHORT, HARD BURST
  10. GRB000604, optical observations
  11. GRB000604, optical observations, comparison with DPOSS
  12. GRB000604 [IPN Position]
  13. GRB000528, Radio Observations
  14. X-ray Afterglow of GRB 000529
  15. IPN localization and time history of GRB000528
  16. New IPN localization of GRB000529
  17. GRB000519: Optical observations
  18. GRB 000528 - WFC measurements
  19. GRB000529: BeppoSAX WFC position
  20. GRB 000528 Optical Observations
  21. IPN triangulation of GRB000519
  22. IPN triangulation of GRB000516
  23. Re: GRB000508B : Optical observations
  24. GRB 000418, Optical observation
  25. Possible GRB-related phenomenon
  26. RXTE/ASM and IPN localization of GRB 000508B
  27. GRB000424, optical observations
  28. IPN localization of GRB000429
  29. GRB000418, Radio detection
  30. GRB 000418, optical observation
  31. GRB 000418, Optical Observation
  32. GRB000418, near-infrared observations
  33. Correction to IPN error box for GRB000419
  34. IPN error box for GRB000418
  35. GRB000419 [IPN Position]
  36. 1SAXJ1715.0-7134 refined position
  37. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  38. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  39. Budget cuts in BeppoSAX operations: impact on GRB observations
  40. GRB000301c results
  41. GRB000408: Optical CCD Observations from MIRO
  42. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  43. GRB000408 [IPN Position]
  44. GRB000326 Optical Observations
  45. GRB 000326: Optical Observations
  46. GRB 000307 optical observations
  47. GRB000323 [IPN Position]
  48. GRB000313, Radio observations
  49. GRB000301C - B and R photometry
  50. GRB000301C - R photometry
  51. GRB 000307, Optical Observations
  52. GRB 000301C: Optical Spectrum and Redshift
  53. GRB 000301C: Optical Spectrum and Redshift
  54. GRB 000301C: A Precise Redshift Determination
  55. GRB 000301C, Optical Observation
  56. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  57. GRB 000301C: HST/STIS CCD Imaging of the field
  58. IPN error box for GRB000307
  59. GRB 000301c: K' observations
  60. GRB000301C, optical R-band observations
  61. GRB000301c - R photometry and nearby faint source confirmation
  62. GRB 000301C: K' Observations
  63. Optical observations of GRB000301c
  64. GRB000301C, Radio observations
  65. GRB000301C, Radio observations
  66. GRB000301C, near-infrared observations (JHK' imaging)
  67. GRB 000301c near-IR observations
  68. GRB 000301C, Optical Color
  69. GRB000301C 250 GHz detection
  70. GRB 000301C R-band observation
  71. GRB 000301C, Optical Observation
  72. GRB000301C, near-infrared observations (JHK' photometry)
  73. GRB 000301C: OT confirmed
  74. GRB 000301A, Radio Observations
  75. GRB000301C, optical observations
  76. GRB000301c, near-infrared observations
  77. GRB000301C
  78. GRB000301C: RXTE/ASM and IPN localizations
  79. HST Observations of GRB 990712
  80. GRB 000214 near-IR observations
  81. GRB 000115 Optical observations
  82. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  83. GRB000210, Radio Observations
  84. IPN annulus for GRB000214
  85. GRB000210 X-ray afterglow
  86. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  87. GRB 000210: BATSE Observations
  88. Correction to Chandra Position of GRB000210 afterglow
  89. Optical observations of the Chandra X-ray source for GRB000210
  90. GRB000210, Radio Observations
  91. Optical candidate for GRB000210
  92. IPN triangulation of GRB000210
  93. GRB000201, Radio Observations
  94. Optical observations of GRB000131
  95. GRB000201 Optical Observations
  96. GRB 000131 Optical Observations
  97. BATSE+IPN location of GRB000131
  98. IPN localization of GRB000131
  99. GRB 000126, optical observations
  100. GRB000126, optical observations

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