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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"

22062 results found.

  1. GRB030329: RTT150 optical observations and upper limit for a host
  2. GRB 030429: Radio Observations
  3. GRB 030429: IR photometry with IRSF/SIRIUS
  4. GRB 030329 Optical Observations
  5. GRB030429: Optical Observations
  6. GRB030501: TAROT candidate afterglow present in archival images
  7. GRB 030501: TAROT possible candidate counterpart
  8. GRB 030429: confirmation of afterglow candidate
  9. GRB030429, possible optical counterpart
  10. GRB 030329 Oprical observations in Rozhen observatory
  11. GRB 030429: ROTSE-III observations
  12. GRB 030324: Radio Observations
  13. GRB030329 observed as a sudden ionospheric disturbance (SID)
  14. GRB030329, SPM optical observations (Correction)
  15. GRB030329, SPM optical observations
  16. GRB 030329, the review of the sky area in plate archive (1950-1998)
  17. Optical Observations of GRB 030418 with Magellan
  18. GRB 030329: optical spectropolarimetry at VLT
  19. GRB030329: optical polarization
  20. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  21. MASTER:optical observations GRB030418
  22. MASTER:optical observations probable GRB030414
  23. GRB030329: 444 AAVSO Measurements
  24. MASTER:optical observations GRB030416
  25. ROTSE-III prompt optical detections of GRB 030418
  26. GRB030418: Upper limits from recent and historical observations.
  27. GRB030418: Kiso near infrared observations
  28. GRB 030418: Optical afterglow
  29. GRB 030418: Optical afterglow candidate
  30. GRB030329: Optical Observations
  31. OT GRB 030329: early UBVRcIc spectral evolution
  32. GRB030329, UBVRI polarimetry, R-polarization
  33. GRB 030329: SARA Optical Observations
  34. OT GRB 030329: early spectrum
  35. GRB030329: VR Photometry at TNG
  36. GRB 030413: Optical Observations
  37. GRB 030329 Rc observations
  38. GRB 030329 VLBA Observations
  39. GRB 030329: VLT V-band photometry
  40. GRB030329: RTT150 optical observations
  41. GRB030329: Near Infrared Observations at Gunma
  42. Kiso observation of the GRB030329 at April 6
  43. GRB030329: Optical observcations
  44. GRB030329: BV photographic observations
  45. GRB 030329 Optical observations
  46. GRB030329: RTT150 optical observations
  47. GRB 030329: Supernova Spectrum Emerging
  48. GRB030329: Kiso B and R band observations
  49. GRB030329: RTT150 optical observation
  50. GRB030329: More AAVSO VR obs
  51. GRB030328: R upper limit after 6 hours by MASTER
  52. GRB 030329: BV photographic observations
  53. GRB 030329: SARA Optical Observations
  54. GRB 030329: SARA Optical Observations
  55. GRB030329: Optical observations
  56. SDSS 0.5m PT observations of GRB030329 (correction)
  57. SDSS 0.5m PT observations of GRB030329
  58. GRB 030329, Optical observations
  59. GRB030329: final R-band light curve by MASTER
  60. GRB030329 - more 15 GHz radio data
  61. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  62. GRB 030329: Sub-millimeter detection
  63. GRB 030329: SARA Optical Observations
  64. GRB 030329: SARA Optical Observations
  65. GRB030329, new UBVRcIc field photometry
  66. GRB030329: optical observations at Tokyo Tech
  67. GRB 030329: optical observations
  68. GRB 030329, BRI photometry
  69. GRB 030329 , SPM optical observations
  70. GRB030329: Optical observations at Teramo
  71. GRB 030329: Radio observations at GMRT
  72. GRB030329: more 15GHz observations
  73. Further AAVSO V,B,R observations of GRB030329
  74. GRB 030329: Additional Mt. Laguna Optical Observations
  75. GRB 030329: SARA Optical Observations
  76. GRB 030329: Observations with ANDICAM
  77. GRB030329: Optical observations
  78. GRB030329: further optical photometry and evidence for a light curve discontinuity
  79. GRB 030329: Correction to GCN 2056
  80. GRB 030329: KAIT optical photometry
  81. GRB030329 Further RBO Optical Observations
  82. GRB 030329: SARA Optical Observations
  83. AAVSO V & R observations of GRB030329
  84. GRB 030329: optical observations
  85. GRB 030329: beginning of the new fading phase in optical band
  86. GRB 030329: optical photometry
  87. GRB030329: Optical observations
  88. Photometry of GRB030329 - Constant OT Magnitude
  89. GRB 030329, R-band observations
  90. GRB 030329: further optical observations
  91. GRB030329 - OT brightens
  92. GRB 030329: OT observations at Kanazawa
  93. GRB 030329 RBO V Optical Observations
  94. GRB030329: Near Infrared Observations
  95. GRB 030324: Optical and NIR Observations
  96. GRB030329: R band light curve by MASTER
  97. GRB030329 - Light curve flattening
  98. GRB 030329: SARA Optical Observations
  99. GRB030329 - near contemporaneous optical limits from CONCAM
  100. GRB030329: R and B observations

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