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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"

27391 results found.

  1. GRB021004 Chandra Observation
  2. IPN detection of continued SGR1900+14 activity
  3. Improved IPN error box for GRB021125
  4. IPN BURST POSITION
  5. IPN triangulation of GRB021125 (INTEGRAL BURST)
  6. GRB021125 : A long GRB localized by INTEGRAL
  7. IPN confirmation of the reactivation of SGR1900+14
  8. GRB021113, SPI ACS observation
  9. GRB 021112: Afterglow or Variable Star?
  10. GRB021113: optical observations at Bisei
  11. GRB 021113: Evidence for a Dark Optical Afterglow
  12. GRB021112, BVRI field photometry
  13. GRB 021112: Variable Source in R-band search
  14. GRB021112: Optical Observations
  15. IPN triangulation of GRB021113 (=H2449; annulus)
  16. GRB 021113: Optical observations
  17. GRB 021112: RAPTOR Observations
  18. GRB021113 (=H2449): A Long GRB Localized by HETE
  19. GRB021112 (=H2448): A Long GRB Localized by HETE
  20. GRB 021016: Optical Observations
  21. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  22. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  23. SGR1900+14 activity, November 2-4, 2002
  24. GRB021104: optical observations
  25. Detection of activity from SGR 1900+14 with the RXTE/PCA
  26. IPN triangulation of GRB021027 (single large error box)
  27. IPN triangulation of GRB021027 (two large error boxes)
  28. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  29. GRB 021004: optical observations
  30. IPN triangulation of GRB021023 (small error boc)
  31. GRB 020813; likely host galaxy.
  32. IPN triangulation of GRB021020 (smaller error box)
  33. IPN triangulation of GRB021020
  34. GRB 021008, optical observations
  35. IPN triangulation of GRB021016 (small error box)
  36. IPN triangulation of GRB021014 (large error box)
  37. IPN triangulation of GRB021013 (single error box)
  38. GRB 021004: optical spectroscopy on Oct 11
  39. IPN triangulation of GRB021013 (two small error boxes)
  40. GRB021004: High-resolution optical spectroscopy
  41. XRF 020903: flattening of the optical light curve.
  42. GRB021004, UBVRcIc field photometry update
  43. IPN triangulation of GRB021008 (single error box)
  44. GRB 021004 submm observations
  45. IPN triangulation of GRB021008 (two small error boxes)
  46. GRB021004 Chandra HETG Observations
  47. GRB 021004: Optical/NIR Observations
  48. GRB 021004: Additional V-band Polarimetric Observations
  49. GRB021004: optical observation
  50. GRB 021004: Host Galaxy Star Formation Rate
  51. GRB 021004 submm observations
  52. GRB 021004: WC wind?
  53. GRB021004: NIR and Optical observations
  54. GRB 021004: Optical observations, AUDE network
  55. GRB 021004 - VLA Radio Observations
  56. GRB 021004 - Unusual Radio-to-Submm Spectrum
  57. GRB 021004: optical spectroscopy
  58. IPN triangulation of GRB021007 (annulus)
  59. GRB021004: optical observations and predicted break time
  60. GRB021004: BVRc photometry
  61. GRB021004 radio observation
  62. HETE fluences for GRB021004
  63. GRB 021004: Optical Photometry at 2.5 Days
  64. GRB 021004: polarimetric observations
  65. GRB 021004: V-band Polarimetric Observations
  66. GRB021004: Update Bisei photometric data
  67. IRAM Millimeter detection of GRB 021004
  68. GRB 021004 radio observation
  69. GRB 021004: Optical Photometry at 1.5 Days
  70. GRB021004, BVRcIc field photometry
  71. GRB021004: Optical Spectroscopy
  72. GRB 021004 radio search
  73. XRF020903, BVRI field photometry
  74. XRF020903: TNG and Asiago photometry
  75. GRB 020903: Optical observations at RIKEN
  76. XRF 020903: Correction to GCN 1560
  77. XRF 020903: VRI observations
  78. XRF 020903: R band observations
  79. XRF 020903: Archival Optical Images
  80. Radio Observations of XRF 020903: The Missing Link
  81. XRF 020903: Supernova
  82. IPN triangulation of GRB020923 (two error boxes)
  83. IPN triangulation of GRB020914B
  84. IPN triangulation of GRB020911 (2 large error boxes)
  85. GRB 020305: HST/STIS observations
  86. Confirmation of IPN error box for GRB020910
  87. IPN triangulation of GRB020910
  88. IPN GCN Circulars now to be issued without restriction
  89. Single IPN error box for GRB020904
  90. XRF 020903: optical observation at Kyoto
  91. GRB020322 : HST/STIS observations
  92. XRF 020903: Optical observations
  93. IPN triangulation of GRB020904
  94. INTEGRAL GRBs added to GCN
  95. SGR1900+14 burst localized by HETE
  96. GRB020813: High-resolution optical spectroscopy
  97. GRB020812: negative optical observations
  98. GRB 020812: optical observation at Kyoto University
  99. Second epoch K band imaging of GRB 020819
  100. GRB 020813 : HST observations

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