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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"

19857 results found.

  1. GRB 030329, the review of the sky area in plate archive (1950-1998)
  2. GRB 030329: optical spectropolarimetry at VLT
  3. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  4. GRB030329: optical polarization
  5. IPN triangulation of GRB030422 (two large error boxes)
  6. MASTER:optical observations GRB030418
  7. MASTER:optical observations probable GRB030414
  8. GRB030418: Upper limits from recent and historical observations.
  9. GRB030418: Kiso near infrared observations
  10. OT GRB 030329: early spectrum
  11. GRB030329: VR Photometry at TNG
  12. IPN triangulation of GRB030414 (small error box)
  13. IPN triangulation of GRB030413 (small error box)
  14. GRB030329, optical position
  15. IPN triangulation of GRB030406 (small error box)
  16. IPN triangulation of GRB050403 (small error box)
  17. Kiso observation of the GRB030329 at April 6
  18. GRB030328, UBVRcIc field photometry
  19. GRB030329: BV photographic observations
  20. GRB 030329 Optical observations
  21. GRB030329: Kiso B and R band observations
  22. GRB030329: Optical observations
  23. SDSS 0.5m PT observations of GRB030329 (correction)
  24. SDSS 0.5m PT observations of GRB030329
  25. GRB030329: final R-band light curve by MASTER
  26. GRB030329, new UBVRcIc field photometry
  27. GRB030329: Optical observations at Teramo
  28. GRB 030329: Radio observations at GMRT
  29. GRB 030329: Additional Mt. Laguna Optical Observations
  30. GRB 030329: Observations with ANDICAM
  31. triangulation of GRB 030331 (single error box)
  32. GRB 030329: optical observations
  33. GRB 030329, optical spectroscopy
  34. GRB 030324: Optical and NIR Observations
  35. GRB030329: R band light curve by MASTER
  36. GRB030329 - Light curve flattening
  37. GRB 030324, optical search
  38. GRB 030329, optical observations
  39. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  40. GRB030329a: detection by Konus-Wind
  41. GRB 030329: Light curve observed during the change of its slope.
  42. GRB030329, BVRcIc field photometry
  43. GRB030329, SPM optical observations
  44. GRB 030329: Optical decay and synthesis
  45. GRB030329 optical observations
  46. GRB 030329: Optical pre-Imaging
  47. GRB 030329: Upper limit from 5.6 hours before trigger
  48. GRB030328: X-ray Afterglow Observed with Chandra
  49. GRB 030329, R-band observations
  50. GRB030329: Upper limits from recent and historical observations.
  51. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  52. GRB 030329: Optical Afterglow Observations
  53. GRB 030328: optical observations
  54. GRB 030329: Optical afterglow fading
  55. GRB 030328: OT photometry
  56. GRB030328: optical photometry at the TNG
  57. GRB 030328: Optical observations
  58. GRB030324 optical observation
  59. GRB030131, BVRcIc field photometry
  60. Possible GRB030323 localized by INTEGRAL
  61. GRB030323: Detection on 2003/03/24
  62. IPN triangulation of GRB030326 (single small error box)
  63. IPN triangulation of GRB030325 (single small error box)
  64. IPN triangulation of GRB030325 (two small error boxes)
  65. GRB030323: V, R, I photometry
  66. GRB030324, Optical Observations
  67. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  68. VLT/FORS2 spectra of GRB 030323
  69. GRB030323, optical observations
  70. GRB030324, BVRcIc field photometry
  71. GRB030323, BVRcIc field calibration
  72. IPN triangulation of GRB030320 (small error box)
  73. Possible GRB 030320 localized by INTEGRAL
  74. IPN triangulation of GRB030306 (single small error box - REVISED)
  75. IPN triangulation of GRB030306 (single small error box)
  76. IPN triangulation of GRB030306 (two small error boxes)
  77. GRB030226, BVRc observations
  78. Chandra detection of the X-ray afterglow of GRB 030226
  79. GRB 030226, further optical/NIR imaging
  80. GRB030227: Kiso optical upper limit
  81. GRB030227, BVRcIc field photometry
  82. GRB030226, BVRcIc field calibration
  83. GRB 030228, optical observations
  84. GRB 030226: Steep Decline
  85. GRB 030227: Confirmed Optical Afterglow (S1-A)
  86. GRB 030227: fading of candidate optical afterglow 'S1-A'
  87. GRB030227:Optical observations
  88. GRB 030227, possible optical counterpart of XMM-Newton source
  89. GRB030227: Kiso optical observations
  90. GRB 030227: Kyoto optical observation
  91. GRB030227 localized by INTEGRAL
  92. GRB 030226 : Predicted light curve
  93. GRB030226: ESI spectroscopy
  94. GRB 030226 simultaneous optical observations
  95. GRB 030226, optical observations
  96. GRB030226: Optical decay index
  97. GRB 030217: Optical Observations at 4, 5, and 6 Days
  98. IPN triangulation of GRB030217 (small error box)
  99. GRB030115, WSRT radio observations - correction to GCN 1864
  100. GRB 030131: marginal optical detection

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