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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').
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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"

20361 results found.

  1. GRB 030329 Oprical observations in Rozhen observatory
  2. IPN triangulation of GRB030425 (single error box)
  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. GRB 030329: optical spectropolarimetry at VLT
  7. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  8. GRB030329: optical polarization
  9. IPN triangulation of GRB030422 (two large error boxes)
  10. MASTER:optical observations GRB030418
  11. MASTER:optical observations probable GRB030414
  12. GRB030418: Upper limits from recent and historical observations.
  13. GRB030418: Kiso near infrared observations
  14. OT GRB 030329: early spectrum
  15. GRB030329: VR Photometry at TNG
  16. IPN triangulation of GRB030414 (small error box)
  17. IPN triangulation of GRB030413 (small error box)
  18. GRB030329, optical position
  19. IPN triangulation of GRB030406 (small error box)
  20. IPN triangulation of GRB050403 (small error box)
  21. Kiso observation of the GRB030329 at April 6
  22. GRB030328, UBVRcIc field photometry
  23. GRB030329: BV photographic observations
  24. GRB 030329 Optical observations
  25. GRB030329: Kiso B and R band observations
  26. GRB030329: Optical observations
  27. SDSS 0.5m PT observations of GRB030329 (correction)
  28. SDSS 0.5m PT observations of GRB030329
  29. GRB030329: final R-band light curve by MASTER
  30. GRB030329, new UBVRcIc field photometry
  31. GRB030329: Optical observations at Teramo
  32. GRB 030329: Radio observations at GMRT
  33. GRB 030329: Additional Mt. Laguna Optical Observations
  34. GRB 030329: Observations with ANDICAM
  35. triangulation of GRB 030331 (single error box)
  36. GRB 030329: optical observations
  37. GRB 030329, optical spectroscopy
  38. GRB 030324: Optical and NIR Observations
  39. GRB030329: R band light curve by MASTER
  40. GRB030329 - Light curve flattening
  41. GRB 030324, optical search
  42. GRB 030329, optical observations
  43. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  44. GRB030329a: detection by Konus-Wind
  45. GRB 030329: Light curve observed during the change of its slope.
  46. GRB030329, BVRcIc field photometry
  47. GRB030329, SPM optical observations
  48. GRB 030329: Optical decay and synthesis
  49. GRB030329 optical observations
  50. GRB 030329: Optical pre-Imaging
  51. GRB 030329: Upper limit from 5.6 hours before trigger
  52. GRB030328: X-ray Afterglow Observed with Chandra
  53. GRB 030329, R-band observations
  54. GRB030329: Upper limits from recent and historical observations.
  55. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  56. GRB 030329: Optical Afterglow Observations
  57. GRB 030328: optical observations
  58. GRB 030329: Optical afterglow fading
  59. GRB 030328: OT photometry
  60. GRB030328: optical photometry at the TNG
  61. GRB 030328: Optical observations
  62. GRB030324 optical observation
  63. GRB030131, BVRcIc field photometry
  64. Possible GRB030323 localized by INTEGRAL
  65. GRB030323: Detection on 2003/03/24
  66. IPN triangulation of GRB030326 (single small error box)
  67. IPN triangulation of GRB030325 (single small error box)
  68. IPN triangulation of GRB030325 (two small error boxes)
  69. GRB030323: V, R, I photometry
  70. GRB030324, Optical Observations
  71. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  72. VLT/FORS2 spectra of GRB 030323
  73. GRB030323, optical observations
  74. GRB030324, BVRcIc field photometry
  75. GRB030323, BVRcIc field calibration
  76. IPN triangulation of GRB030320 (small error box)
  77. Possible GRB 030320 localized by INTEGRAL
  78. IPN triangulation of GRB030306 (single small error box - REVISED)
  79. IPN triangulation of GRB030306 (single small error box)
  80. IPN triangulation of GRB030306 (two small error boxes)
  81. GRB030226, BVRc observations
  82. Chandra detection of the X-ray afterglow of GRB 030226
  83. GRB 030226, further optical/NIR imaging
  84. GRB030227: Kiso optical upper limit
  85. GRB030227, BVRcIc field photometry
  86. GRB030226, BVRcIc field calibration
  87. GRB 030228, optical observations
  88. GRB 030226: Steep Decline
  89. GRB 030227: Confirmed Optical Afterglow (S1-A)
  90. GRB 030227: fading of candidate optical afterglow 'S1-A'
  91. GRB030227:Optical observations
  92. GRB 030227, possible optical counterpart of XMM-Newton source
  93. GRB030227: Kiso optical observations
  94. GRB 030227: Kyoto optical observation
  95. GRB030227 localized by INTEGRAL
  96. GRB 030226 : Predicted light curve
  97. GRB030226: ESI spectroscopy
  98. GRB 030226 simultaneous optical observations
  99. GRB 030226, optical observations
  100. GRB030226: Optical decay index

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