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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"

28229 results found.

  1. GRB 021211: R-band observations at late-time
  2. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  3. GRB 030115 : Possible IR counterpart
  4. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  5. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  6. GRB 030115: APO Optical Observations
  7. Information about where HETE will be pointing
  8. VLT spectroscopy of the probable host of GRB 021211
  9. IPN triangulation of GRB030101 (two large error boxes)
  10. GRB 021211: Probable Host and Underlying Supernova
  11. GRB 021112: Evidence for Another Dark Optical Afterglow
  12. GRB 021219: OSN optical observations
  13. GRB021219, optical observations
  14. GRB021219, optical observation by MASTER
  15. VLT spectra of GRB 021211 revisited
  16. GRB021219: a long GRB localized by INTEGRAL
  17. GRB021211: APO optical observations
  18. XRF 020903 : HST observations
  19. GRB 021201: Optical Observations
  20. GRB 021211: CTIO observations
  21. GRB021211, BVRI field photometry
  22. GRB021211: Optical observations in CrAO
  23. GRB 021211, optical observations
  24. GRB021211: Kiso Observations
  25. GRB 021201, optical observations
  26. GRB021211: Optical observations
  27. GRB 021201 (short/hard), NOT observations
  28. SUB-MM SEARCH FOR GRB 021211
  29. Chandra observation of the IPN error box of GRB021201 (short/hard)
  30. GRB 021211, R- and I-band observations
  31. GRB021211 - Upper limits from recent and historical observations
  32. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  33. IPN triangulation of GRB021206 (small error box)
  34. IPN triangulation of GRB021205 (large error box)
  35. GRB021201, BVRcIc field photometry
  36. GRB 021201: BOOTES simultaneous optical observations
  37. IPN triangulation of GRB021201 (short/hard burst, small error box)
  38. GRB021004, late time optical observations
  39. GRB021004 Chandra Observation
  40. IPN detection of continued SGR1900+14 activity
  41. Improved IPN error box for GRB021125
  42. IPN BURST POSITION
  43. IPN triangulation of GRB021125 (INTEGRAL BURST)
  44. GRB021125 : A long GRB localized by INTEGRAL
  45. IPN confirmation of the reactivation of SGR1900+14
  46. GRB021113, SPI ACS observation
  47. GRB 021112: Afterglow or Variable Star?
  48. GRB021113: optical observations at Bisei
  49. GRB 021113: Evidence for a Dark Optical Afterglow
  50. GRB021112, BVRI field photometry
  51. GRB 021112: Variable Source in R-band search
  52. GRB021112: Optical Observations
  53. IPN triangulation of GRB021113 (=H2449; annulus)
  54. GRB 021113: Optical observations
  55. GRB 021112: RAPTOR Observations
  56. GRB021113 (=H2449): A Long GRB Localized by HETE
  57. GRB021112 (=H2448): A Long GRB Localized by HETE
  58. GRB 021016: Optical Observations
  59. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  60. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  61. SGR1900+14 activity, November 2-4, 2002
  62. GRB021104: optical observations
  63. Detection of activity from SGR 1900+14 with the RXTE/PCA
  64. IPN triangulation of GRB021027 (single large error box)
  65. IPN triangulation of GRB021027 (two large error boxes)
  66. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  67. GRB 021004: optical observations
  68. IPN triangulation of GRB021023 (small error boc)
  69. GRB 020813; likely host galaxy.
  70. IPN triangulation of GRB021020 (smaller error box)
  71. IPN triangulation of GRB021020
  72. GRB 021008, optical observations
  73. IPN triangulation of GRB021016 (small error box)
  74. IPN triangulation of GRB021014 (large error box)
  75. IPN triangulation of GRB021013 (single error box)
  76. GRB 021004: optical spectroscopy on Oct 11
  77. IPN triangulation of GRB021013 (two small error boxes)
  78. GRB021004: High-resolution optical spectroscopy
  79. XRF 020903: flattening of the optical light curve.
  80. GRB021004, UBVRcIc field photometry update
  81. IPN triangulation of GRB021008 (single error box)
  82. GRB 021004 submm observations
  83. IPN triangulation of GRB021008 (two small error boxes)
  84. GRB021004 Chandra HETG Observations
  85. GRB 021004: Optical/NIR Observations
  86. GRB 021004: Additional V-band Polarimetric Observations
  87. GRB021004: optical observation
  88. GRB 021004: Host Galaxy Star Formation Rate
  89. GRB 021004 submm observations
  90. GRB 021004: WC wind?
  91. GRB021004: NIR and Optical observations
  92. GRB 021004: Optical observations, AUDE network
  93. GRB 021004 - VLA Radio Observations
  94. GRB 021004 - Unusual Radio-to-Submm Spectrum
  95. GRB 021004: optical spectroscopy
  96. IPN triangulation of GRB021007 (annulus)
  97. GRB021004: optical observations and predicted break time
  98. GRB021004: BVRc photometry
  99. GRB021004 radio observation
  100. HETE fluences for GRB021004

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