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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"

22051 results found.

  1. GRB 030324: Radio Observations
  2. GRB030329 observed as a sudden ionospheric disturbance (SID)
  3. GRB030329, SPM optical observations (Correction)
  4. GRB030329, SPM optical observations
  5. GRB 030329, the review of the sky area in plate archive (1950-1998)
  6. Optical Observations of GRB 030418 with Magellan
  7. GRB 030329: optical spectropolarimetry at VLT
  8. GRB030329: optical polarization
  9. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  10. MASTER:optical observations GRB030418
  11. MASTER:optical observations probable GRB030414
  12. GRB030329: 444 AAVSO Measurements
  13. MASTER:optical observations GRB030416
  14. ROTSE-III prompt optical detections of GRB 030418
  15. GRB030418: Upper limits from recent and historical observations.
  16. GRB030418: Kiso near infrared observations
  17. GRB 030418: Optical afterglow
  18. GRB 030418: Optical afterglow candidate
  19. GRB030329: Optical Observations
  20. OT GRB 030329: early UBVRcIc spectral evolution
  21. GRB030329, UBVRI polarimetry, R-polarization
  22. GRB 030329: SARA Optical Observations
  23. OT GRB 030329: early spectrum
  24. GRB030329: VR Photometry at TNG
  25. GRB 030413: Optical Observations
  26. GRB 030329 Rc observations
  27. GRB 030329 VLBA Observations
  28. GRB 030329: VLT V-band photometry
  29. GRB030329: RTT150 optical observations
  30. GRB030329: Near Infrared Observations at Gunma
  31. Kiso observation of the GRB030329 at April 6
  32. GRB030329: Optical observcations
  33. GRB030329: BV photographic observations
  34. GRB 030329 Optical observations
  35. GRB030329: RTT150 optical observations
  36. GRB 030329: Supernova Spectrum Emerging
  37. GRB030329: Kiso B and R band observations
  38. GRB030329: RTT150 optical observation
  39. GRB030329: More AAVSO VR obs
  40. GRB030328: R upper limit after 6 hours by MASTER
  41. GRB 030329: BV photographic observations
  42. GRB 030329: SARA Optical Observations
  43. GRB 030329: SARA Optical Observations
  44. GRB030329: Optical observations
  45. SDSS 0.5m PT observations of GRB030329 (correction)
  46. SDSS 0.5m PT observations of GRB030329
  47. GRB 030329, Optical observations
  48. GRB030329: final R-band light curve by MASTER
  49. GRB030329 - more 15 GHz radio data
  50. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  51. GRB 030329: Sub-millimeter detection
  52. GRB 030329: SARA Optical Observations
  53. GRB 030329: SARA Optical Observations
  54. GRB030329, new UBVRcIc field photometry
  55. GRB030329: optical observations at Tokyo Tech
  56. GRB 030329: optical observations
  57. GRB 030329, BRI photometry
  58. GRB 030329 , SPM optical observations
  59. GRB030329: Optical observations at Teramo
  60. GRB 030329: Radio observations at GMRT
  61. GRB030329: more 15GHz observations
  62. Further AAVSO V,B,R observations of GRB030329
  63. GRB 030329: Additional Mt. Laguna Optical Observations
  64. GRB 030329: SARA Optical Observations
  65. GRB 030329: Observations with ANDICAM
  66. GRB030329: Optical observations
  67. GRB030329: further optical photometry and evidence for a light curve discontinuity
  68. GRB 030329: Correction to GCN 2056
  69. GRB 030329: KAIT optical photometry
  70. GRB030329 Further RBO Optical Observations
  71. GRB 030329: SARA Optical Observations
  72. AAVSO V & R observations of GRB030329
  73. GRB 030329: optical observations
  74. GRB 030329: beginning of the new fading phase in optical band
  75. GRB 030329: optical photometry
  76. GRB030329: Optical observations
  77. Photometry of GRB030329 - Constant OT Magnitude
  78. GRB 030329, R-band observations
  79. GRB 030329: further optical observations
  80. GRB030329 - OT brightens
  81. GRB 030329: OT observations at Kanazawa
  82. GRB 030329 RBO V Optical Observations
  83. GRB030329: Near Infrared Observations
  84. GRB 030324: Optical and NIR Observations
  85. GRB030329: R band light curve by MASTER
  86. GRB030329 - Light curve flattening
  87. GRB 030329: SARA Optical Observations
  88. GRB030329 - near contemporaneous optical limits from CONCAM
  89. GRB030329: R and B observations
  90. GRB 030329, optical observations
  91. GRB030329: Optical observations
  92. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  93. GRB 030329: Light curve observed during the change of its slope.
  94. GRB030329, SPM optical observations
  95. GRB030329: ROTSE network observes steepening of decay curve
  96. GRB 030329: Optical decay and synthesis
  97. GRB030329 optical observations
  98. GRB030329: optical spectroscopy with the TNG
  99. GRB 030329: Radio Observations
  100. GRB 030329: Optical pre-Imaging

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