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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"

15725 results found.

  1. GRB 030429: Radio Observations
  2. GRB 030429: redshift from VLT spectroscopy
  3. GRB 030329 Optical Observations
  4. GRB030328, optical observation
  5. GRB030429: Optical Observations
  6. GRB030501: TAROT candidate afterglow present in archival images
  7. GRB030429, possible optical counterpart
  8. GRB030425: CrAO optical observation
  9. GRB 030329 Oprical observations in Rozhen observatory
  10. GRB 030324: Radio Observations
  11. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  12. GRB030329, SPM optical observations (Correction)
  13. GRB030329, SPM optical observations
  14. GRB 030329: Spectral Evolution of SN 2003dh
  15. Optical Observations of GRB 030418 with Magellan
  16. GRB 030329: optical spectropolarimetry at VLT
  17. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  18. GRB030329: optical polarization
  19. GRB030329, optical observation
  20. ROTSE-III prompt optical detections of GRB 030418
  21. GRB030418: Upper limits from recent and historical observations.
  22. GRB 030418: Optical afterglow
  23. GRB 030418: Finder for afterglow candidate
  24. GRB 030418: Optical afterglow candidate
  25. GRB 030329 OT position
  26. GRB030329: Optical Observations
  27. GRB030329, UBVRI polarimetry, R-polarization
  28. GRB 030329: SARA Optical Observations
  29. OT GRB 030329: early spectrum
  30. GRB030324: Candidate Optical Afterglow (Erratum)
  31. GRB030324: Candidate Optical Afterglow
  32. GRB 030413: Optical Observations
  33. GRB 030329 Rc observations
  34. GRB030329, optical position
  35. GRB 030329 VLBA Observations
  36. GRB 030329, light curve flattens
  37. GRB 030329: VLT V-band photometry
  38. GRB030329: RTT150 optical observations
  39. GRB030329: Near Infrared Observations at Gunma
  40. GRB030329: HET spectroscopic monitoring
  41. Kiso observation of the GRB030329 at April 6
  42. GRB 030329, color evolution
  43. GRB030328, UBVRcIc field photometry
  44. GRB030329: Optical observcations
  45. GRB030329: BV photographic observations
  46. GRB 030329 Optical observations
  47. GRB 030329, color evolution
  48. GRB 030329: possible color change
  49. GRB030329: RTT150 optical observations
  50. GRB030329: Kiso B and R band observations
  51. GRB030329: RTT150 optical observation
  52. GRB 030329: SARA Optical Observations
  53. GRB 030329: SARA Optical Observations
  54. GRB030329: Optical observations
  55. SDSS 0.5m PT observations of GRB030329 (correction)
  56. SDSS 0.5m PT observations of GRB030329
  57. GRB 030329, Optical observations
  58. GRB030329, cessation of fading
  59. GRB030329: final R-band light curve by MASTER
  60. GRB 030329: SARA Optical Observations
  61. GRB 030329: SARA Optical Observations
  62. GRB030329, optical observation
  63. GRB030329, optical observation
  64. GRB030329, new UBVRcIc field photometry
  65. GRB 030329, light curve and SN prediction
  66. GRB030329: optical observations at Tokyo Tech
  67. GRB 030329: optical observations
  68. GRB 030329 , SPM optical observations
  69. GRB030329: Optical observations at Teramo
  70. GRB 030329: Additional Mt. Laguna Optical Observations
  71. GRB 030329: SARA Optical Observations
  72. GRB 030329: Observations with ANDICAM
  73. GRB030329: Optical observations
  74. GRB030329: further optical photometry and evidence for a light curve discontinuity
  75. GRB 030329: KAIT optical photometry
  76. GRB030329 Further RBO Optical Observations
  77. GRB 030329: SARA Optical Observations
  78. GRB 030329: optical observations
  79. GRB 030329: beginning of the new fading phase in optical band
  80. GRB 030329, optical spectroscopy
  81. GRB 030329: optical photometry
  82. GRB030329: Optical observations
  83. GRB 030329: further optical observations
  84. GRB 030329 RBO V Optical Observations
  85. GRB 030329, optical photometry
  86. GRB030329: Near Infrared Observations
  87. GRB 030324: Optical and NIR Observations
  88. GRB 030328, optical photometry
  89. GRB 030329: SARA Optical Observations
  90. GRB 030324, optical search
  91. GRB030329 - near contemporaneous optical limits from CONCAM
  92. GRB 030329, optical observations
  93. GRB030329: Optical observations
  94. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  95. GRB 030329: Light curve observed during the change of its slope.
  96. GRB030329, BVRcIc field photometry
  97. GRB030329, SPM optical observations
  98. GRB 030329: Optical Decay
  99. Redshift of GRB 030329
  100. GRB030329: ROTSE network observes steepening of decay curve

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