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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"

27324 results found.

  1. GRB 030115: APO Optical Observations
  2. Information about where HETE will be pointing
  3. VLT spectroscopy of the probable host of GRB 021211
  4. IPN triangulation of GRB030101 (two large error boxes)
  5. GRB 021211: Probable Host and Underlying Supernova
  6. GRB 021112: Evidence for Another Dark Optical Afterglow
  7. GRB 021219: OSN optical observations
  8. GRB021219, optical observations
  9. GRB021219, optical observation by MASTER
  10. VLT spectra of GRB 021211 revisited
  11. GRB021219: a long GRB localized by INTEGRAL
  12. GRB021211: APO optical observations
  13. XRF 020903 : HST observations
  14. GRB 021201: Optical Observations
  15. GRB 021211: CTIO observations
  16. GRB021211, BVRI field photometry
  17. GRB021211: Optical observations in CrAO
  18. GRB 021211, optical observations
  19. GRB021211: Kiso Observations
  20. GRB 021201, optical observations
  21. GRB021211: Optical observations
  22. GRB 021201 (short/hard), NOT observations
  23. SUB-MM SEARCH FOR GRB 021211
  24. Chandra observation of the IPN error box of GRB021201 (short/hard)
  25. GRB 021211, R- and I-band observations
  26. GRB021211 - Upper limits from recent and historical observations
  27. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  28. IPN triangulation of GRB021206 (small error box)
  29. IPN triangulation of GRB021205 (large error box)
  30. GRB021201, BVRcIc field photometry
  31. GRB 021201: BOOTES simultaneous optical observations
  32. IPN triangulation of GRB021201 (short/hard burst, small error box)
  33. GRB021004, late time optical observations
  34. GRB021004 Chandra Observation
  35. IPN detection of continued SGR1900+14 activity
  36. Improved IPN error box for GRB021125
  37. IPN BURST POSITION
  38. IPN triangulation of GRB021125 (INTEGRAL BURST)
  39. GRB021125 : A long GRB localized by INTEGRAL
  40. IPN confirmation of the reactivation of SGR1900+14
  41. GRB021113, SPI ACS observation
  42. GRB 021112: Afterglow or Variable Star?
  43. GRB021113: optical observations at Bisei
  44. GRB 021113: Evidence for a Dark Optical Afterglow
  45. GRB021112, BVRI field photometry
  46. GRB 021112: Variable Source in R-band search
  47. GRB021112: Optical Observations
  48. IPN triangulation of GRB021113 (=H2449; annulus)
  49. GRB 021113: Optical observations
  50. GRB 021112: RAPTOR Observations
  51. GRB021113 (=H2449): A Long GRB Localized by HETE
  52. GRB021112 (=H2448): A Long GRB Localized by HETE
  53. GRB 021016: Optical Observations
  54. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  55. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  56. SGR1900+14 activity, November 2-4, 2002
  57. GRB021104: optical observations
  58. Detection of activity from SGR 1900+14 with the RXTE/PCA
  59. IPN triangulation of GRB021027 (single large error box)
  60. IPN triangulation of GRB021027 (two large error boxes)
  61. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  62. GRB 021004: optical observations
  63. IPN triangulation of GRB021023 (small error boc)
  64. GRB 020813; likely host galaxy.
  65. IPN triangulation of GRB021020 (smaller error box)
  66. IPN triangulation of GRB021020
  67. GRB 021008, optical observations
  68. IPN triangulation of GRB021016 (small error box)
  69. IPN triangulation of GRB021014 (large error box)
  70. IPN triangulation of GRB021013 (single error box)
  71. GRB 021004: optical spectroscopy on Oct 11
  72. IPN triangulation of GRB021013 (two small error boxes)
  73. GRB021004: High-resolution optical spectroscopy
  74. XRF 020903: flattening of the optical light curve.
  75. GRB021004, UBVRcIc field photometry update
  76. IPN triangulation of GRB021008 (single error box)
  77. GRB 021004 submm observations
  78. IPN triangulation of GRB021008 (two small error boxes)
  79. GRB021004 Chandra HETG Observations
  80. GRB 021004: Optical/NIR Observations
  81. GRB 021004: Additional V-band Polarimetric Observations
  82. GRB021004: optical observation
  83. GRB 021004: Host Galaxy Star Formation Rate
  84. GRB 021004 submm observations
  85. GRB 021004: WC wind?
  86. GRB021004: NIR and Optical observations
  87. GRB 021004: Optical observations, AUDE network
  88. GRB 021004 - VLA Radio Observations
  89. GRB 021004 - Unusual Radio-to-Submm Spectrum
  90. GRB 021004: optical spectroscopy
  91. IPN triangulation of GRB021007 (annulus)
  92. GRB021004: optical observations and predicted break time
  93. GRB021004: BVRc photometry
  94. GRB021004 radio observation
  95. HETE fluences for GRB021004
  96. GRB 021004: Optical Photometry at 2.5 Days
  97. GRB 021004: polarimetric observations
  98. GRB 021004: V-band Polarimetric Observations
  99. GRB021004: Update Bisei photometric data
  100. IRAM Millimeter detection of GRB 021004

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