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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"

44400 results found.

  1. GRB000615, further R-band photometry
  2. GRB 000615: NIR observations
  3. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  4. GRB000615, R-band photometry
  5. GRB000615: BeppoSAX refined coordinates
  6. GRB980425, HST/STIS observations of the host galaxy
  7. GRB000615: BeppoSAX GRB Alert
  8. The Hosts of GRB 980703 and GRB 971214
  9. GRB 000301C: Further Late-Time HST/STIS observations
  10. GRB000528: follow-up X-ray measurements and update of IPN annulus
  11. Optical Follow-up of GRB000529 Error Box
  12. GRB980519, HST/STIS observations of the host galaxy
  13. GRB000607, Radio Observations
  14. BeppoSAX X-ray transient/possible GRB000608
  15. GRB000604 optical non-detection
  16. GRB000604 - Optical observations
  17. GRB000607, A SHORT, HARD BURST
  18. GRB000604, optical observations
  19. GRB000528, optical observations at ESO
  20. GRB 000604 optical observations
  21. GRB 000418: Detection of the Host Galaxy
  22. GRB000604, optical observations, comparison with DPOSS
  23. GRB000604 [IPN Position]
  24. GRB000528, Radio Observations
  25. X-ray Afterglow of GRB 000529
  26. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  27. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  28. GRB000529: Optical Observations
  29. IPN localization and time history of GRB000528
  30. New IPN localization of GRB000529
  31. GRB000519: Optical observations
  32. IPN localization of GRB000529
  33. GRB 000528 - WFC measurements
  34. GRB000529: BeppoSAX WFC position
  35. GRB000528: BeppoSAX GRBM observations
  36. GRB 000528 Optical Observations
  37. GRB000519, BVRI field photometry
  38. IPN triangulation of GRB000519
  39. IPN triangulation of GRB000516
  40. Re: GRB000508B : Optical observations
  41. GRB 000418, Optical observation
  42. GRB000508B, optical photometry
  43. GRB000508B, BVR field photometry
  44. Possible GRB-related phenomenon
  45. RXTE/ASM and IPN localization of GRB 000508B
  46. GRB000424, UBVRI field photometry
  47. GRB 000424 Optical Observations
  48. GRB000418, UBVRI field photometry update
  49. The redshift of GRB 000418
  50. GRB000424, optical observations
  51. GRB 000429, optical observation
  52. GRB 000429, UBVRI field photometry
  53. IPN localization of GRB000429
  54. GRB 000418, UBVRI field photometry
  55. GRB000418, Radio detection
  56. GRB000418, K'-band photometry
  57. GRB 000418, Optical Observation
  58. GRB 000418, optical observation
  59. GRB000424 Optical Observations
  60. GRB 000418, Optical Observation
  61. GRB000424, optical observations
  62. GRB000424, optical observations
  63. GRB 000424, Optical Observations
  64. GRB 000418, Optical Observation
  65. GRB000418, near-infrared observations
  66. BeppoSAX GRB000424
  67. Correction to IPN error box for GRB000419
  68. IPN error box for GRB000418
  69. GRB000419 [IPN Position]
  70. GRB000416 Optical Observations
  71. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  72. GRB000416 BRJK observations
  73. 1SAXJ1715.0-7134 refined position
  74. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  75. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  76. Budget cuts in BeppoSAX operations: impact on GRB observations
  77. GRB 000408, optical observations
  78. Refined IPN error box for GRB000408
  79. GRB 991208, UBVRI field photometry
  80. GRB000301c results
  81. GRB000408: Optical CCD Observations from MIRO
  82. GRB000408, lotis optical observations
  83. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  84. GRB000408 [IPN Position]
  85. GRB000326 Optical Observations
  86. GRB000301C - Addendum to GCN 623
  87. GRB000301C - R magnitude lower limit
  88. GRB000326, Further VLA observations
  89. GRB 000323, optical observations
  90. GRB 000326: Optical Observations
  91. GRB000326, Radio observations
  92. GRB000326 [IPN Position]
  93. GRB 000307 optical observations
  94. GRB000323 [IPN Position]
  95. Single error box for GRB000315
  96. GRB000315 [IPN Positions]
  97. GRB000313, Radio observations
  98. GRB 000313 - optical transient in the BATSE error box
  99. GRB000301C - B and R photometry
  100. GRB000301C - R photometry

Advanced

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