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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21815 results found.

  1. GRB030131: refined position
  2. GRB 030131 optical observations
  3. A long GRB detected by INTEGRAL
  4. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  5. GRB 030115, simultaneous observations by BOOTES-1
  6. GRB 030115: IR observations with IRSF/SIRIUS
  7. GRB030115, afterglow candidate
  8. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  9. GRB 030115 : Possible IR counterpart
  10. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  11. GRB 030115: APO Optical Observations
  12. IPN triangulation of GRB030102 (annulus)
  13. VLT spectroscopy of the probable host of GRB 021211
  14. GRB 021211: Probable Host and Underlying Supernova
  15. GRB 021112: Evidence for Another Dark Optical Afterglow
  16. GRB 021219: OSN optical observations
  17. GRB021219, optical observations
  18. GRB021219, optical observation by MASTER
  19. GRB021219: a long GRB localized by INTEGRAL
  20. GRB021211: APO optical observations
  21. IPN detection of continued activity from SGR1806-20
  22. XRF 020903 : HST observations
  23. GRB 021201: Optical Observations
  24. GRB 021211: CTIO observations
  25. GRB 021211: early break in light curve
  26. GRB021211, BVRI field photometry
  27. GRB021211: Optical observations in CrAO
  28. GRB 021211, optical observations
  29. GRB021211: Kiso Observations
  30. GRB 021201, optical observations
  31. GRB021211: Optical observations
  32. GRB 021201 (short/hard), NOT observations
  33. Chandra observation of the IPN error box of GRB021201 (short/hard)
  34. GRB 021211, R- and I-band observations
  35. GRB021211 - Upper limits from recent and historical observations
  36. GRB 021204: I-band Observations
  37. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  38. GRB 021125: Radio Observations
  39. IPN detection of renewed activity from SGR1806-20
  40. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  41. GRB021201, BVRcIc field photometry
  42. GRB 021201: BOOTES simultaneous optical observations
  43. GRB021004, late time optical observations
  44. GRB021125 : A long GRB localized by INTEGRAL
  45. GRB 021112: Afterglow or Variable Star?
  46. GRB021113: optical observations at Bisei
  47. GRB 021113: Evidence for a Dark Optical Afterglow
  48. GRB021112, BVRI field photometry
  49. GRB 021112: Variable Source in R-band search
  50. GRB021112: Optical Observations
  51. GRB 021113: Optical observations
  52. GRB 021112: RAPTOR Observations
  53. GRB021113 (=H2449): A Long GRB Localized by HETE
  54. GRB 021016: Optical Observations
  55. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  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. GRB 021004: optical observations
  60. GRB 021008, radio observations
  61. GRB 021008, optical observations
  62. IPN triangulation of GRB021014 (large error box)
  63. IPN triangulation of GRB021013 (two small error boxes)
  64. XRF 020903: flattening of the optical light curve.
  65. GRB021004, UBVRcIc field photometry update
  66. IPN triangulation of GRB021008 (two small error boxes)
  67. GRB021004 Chandra HETG Observations
  68. GRB 021004: Optical/NIR Observations
  69. GRB 021004: Additional V-band Polarimetric Observations
  70. GRB021004: optical observation
  71. GRB 021004: Host Galaxy Star Formation Rate
  72. GRB 021004: WC wind?
  73. IPN triangulation of GRB021008
  74. GRB 021004: Optical observations, AUDE network
  75. IPN triangulation of GRB021007 (annulus)
  76. GRB021004: BVRc photometry
  77. GRB021004 radio observation
  78. GRB 021004 continued IR fading
  79. GRB 021004: Optical Photometry at 2.5 Days
  80. GRB 021004: polarimetric observations
  81. GRB 021004: V-band Polarimetric Observations
  82. GRB021004: Update Bisei photometric data
  83. GRB 021004 radio observation
  84. GRB 021004: Optical Observations
  85. GRB021004: continued fading
  86. GRB 021004: Optical Photometry at 1.5 Days
  87. GRB021004, Optical Observations
  88. GRB021004, BVRcIc field photometry
  89. GRB021004: Optical Spectroscopy
  90. GRB 021004: Optical Observations
  91. GRB 021004, SPM optical observations
  92. GRB 021004, optical observations
  93. GRB 021004 radio search
  94. GRB021004: Upper limits from recent and historical observations
  95. XRF020903, BVRI field photometry
  96. XRF020903: TNG and Asiago photometry
  97. XRF 020903: Correction to GCN 1560
  98. XRF 020903: VRI observations
  99. XRF 020903: R band observations
  100. IPN triangulation of GRB020923 (two error boxes)

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