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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"

27403 results found.

  1. GRB 021201 (short/hard), NOT observations
  2. SUB-MM SEARCH FOR GRB 021211
  3. Chandra observation of the IPN error box of GRB021201 (short/hard)
  4. GRB 021211, R- and I-band observations
  5. GRB021211 - Upper limits from recent and historical observations
  6. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  7. IPN triangulation of GRB021206 (small error box)
  8. IPN triangulation of GRB021205 (large error box)
  9. GRB021201, BVRcIc field photometry
  10. GRB 021201: BOOTES simultaneous optical observations
  11. IPN triangulation of GRB021201 (short/hard burst, small error box)
  12. GRB021004, late time optical observations
  13. GRB021004 Chandra Observation
  14. IPN detection of continued SGR1900+14 activity
  15. Improved IPN error box for GRB021125
  16. IPN BURST POSITION
  17. IPN triangulation of GRB021125 (INTEGRAL BURST)
  18. GRB021125 : A long GRB localized by INTEGRAL
  19. IPN confirmation of the reactivation of SGR1900+14
  20. GRB021113, SPI ACS observation
  21. GRB 021112: Afterglow or Variable Star?
  22. GRB021113: optical observations at Bisei
  23. GRB 021113: Evidence for a Dark Optical Afterglow
  24. GRB021112, BVRI field photometry
  25. GRB 021112: Variable Source in R-band search
  26. GRB021112: Optical Observations
  27. IPN triangulation of GRB021113 (=H2449; annulus)
  28. GRB 021113: Optical observations
  29. GRB 021112: RAPTOR Observations
  30. GRB021113 (=H2449): A Long GRB Localized by HETE
  31. GRB021112 (=H2448): A Long GRB Localized by HETE
  32. GRB 021016: Optical Observations
  33. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  34. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  35. SGR1900+14 activity, November 2-4, 2002
  36. GRB021104: optical observations
  37. Detection of activity from SGR 1900+14 with the RXTE/PCA
  38. IPN triangulation of GRB021027 (single large error box)
  39. IPN triangulation of GRB021027 (two large error boxes)
  40. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  41. GRB 021004: optical observations
  42. IPN triangulation of GRB021023 (small error boc)
  43. GRB 020813; likely host galaxy.
  44. IPN triangulation of GRB021020 (smaller error box)
  45. IPN triangulation of GRB021020
  46. GRB 021008, optical observations
  47. IPN triangulation of GRB021016 (small error box)
  48. IPN triangulation of GRB021014 (large error box)
  49. IPN triangulation of GRB021013 (single error box)
  50. GRB 021004: optical spectroscopy on Oct 11
  51. IPN triangulation of GRB021013 (two small error boxes)
  52. GRB021004: High-resolution optical spectroscopy
  53. XRF 020903: flattening of the optical light curve.
  54. GRB021004, UBVRcIc field photometry update
  55. IPN triangulation of GRB021008 (single error box)
  56. GRB 021004 submm observations
  57. IPN triangulation of GRB021008 (two small error boxes)
  58. GRB021004 Chandra HETG Observations
  59. GRB 021004: Optical/NIR Observations
  60. GRB 021004: Additional V-band Polarimetric Observations
  61. GRB021004: optical observation
  62. GRB 021004: Host Galaxy Star Formation Rate
  63. GRB 021004 submm observations
  64. GRB 021004: WC wind?
  65. GRB021004: NIR and Optical observations
  66. GRB 021004: Optical observations, AUDE network
  67. GRB 021004 - VLA Radio Observations
  68. GRB 021004 - Unusual Radio-to-Submm Spectrum
  69. GRB 021004: optical spectroscopy
  70. IPN triangulation of GRB021007 (annulus)
  71. GRB021004: optical observations and predicted break time
  72. GRB021004: BVRc photometry
  73. GRB021004 radio observation
  74. HETE fluences for GRB021004
  75. GRB 021004: Optical Photometry at 2.5 Days
  76. GRB 021004: polarimetric observations
  77. GRB 021004: V-band Polarimetric Observations
  78. GRB021004: Update Bisei photometric data
  79. IRAM Millimeter detection of GRB 021004
  80. GRB 021004 radio observation
  81. GRB 021004: Optical Photometry at 1.5 Days
  82. GRB021004, BVRcIc field photometry
  83. GRB021004: Optical Spectroscopy
  84. GRB 021004 radio search
  85. XRF020903, BVRI field photometry
  86. XRF020903: TNG and Asiago photometry
  87. GRB 020903: Optical observations at RIKEN
  88. XRF 020903: Correction to GCN 1560
  89. XRF 020903: VRI observations
  90. XRF 020903: R band observations
  91. XRF 020903: Archival Optical Images
  92. Radio Observations of XRF 020903: The Missing Link
  93. XRF 020903: Supernova
  94. IPN triangulation of GRB020923 (two error boxes)
  95. IPN triangulation of GRB020914B
  96. IPN triangulation of GRB020911 (2 large error boxes)
  97. GRB 020305: HST/STIS observations
  98. Confirmation of IPN error box for GRB020910
  99. IPN triangulation of GRB020910
  100. IPN GCN Circulars now to be issued without restriction

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