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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"

28233 results found.

  1. GRB 030115, simultaneous observations by BOOTES-1
  2. GRB 030115: IR observations with IRSF/SIRIUS
  3. IPN triangulation of GRB030115C (large error box)
  4. GRB030115, afterglow candidate
  5. GRB 021211: R-band observations at late-time
  6. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  7. GRB 030115 : Possible IR counterpart
  8. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  9. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  10. GRB 030115: APO Optical Observations
  11. Information about where HETE will be pointing
  12. VLT spectroscopy of the probable host of GRB 021211
  13. IPN triangulation of GRB030101 (two large error boxes)
  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. VLT spectra of GRB 021211 revisited
  20. GRB021219: a long GRB localized by INTEGRAL
  21. GRB021211: APO optical observations
  22. XRF 020903 : HST observations
  23. GRB 021201: Optical Observations
  24. GRB 021211: CTIO observations
  25. GRB021211, BVRI field photometry
  26. GRB021211: Optical observations in CrAO
  27. GRB 021211, optical observations
  28. GRB021211: Kiso Observations
  29. GRB 021201, optical observations
  30. GRB021211: Optical observations
  31. GRB 021201 (short/hard), NOT observations
  32. SUB-MM SEARCH FOR GRB 021211
  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. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  37. IPN triangulation of GRB021206 (small error box)
  38. IPN triangulation of GRB021205 (large error box)
  39. GRB021201, BVRcIc field photometry
  40. GRB 021201: BOOTES simultaneous optical observations
  41. IPN triangulation of GRB021201 (short/hard burst, small error box)
  42. GRB021004, late time optical observations
  43. GRB021004 Chandra Observation
  44. IPN detection of continued SGR1900+14 activity
  45. Improved IPN error box for GRB021125
  46. IPN BURST POSITION
  47. IPN triangulation of GRB021125 (INTEGRAL BURST)
  48. GRB021125 : A long GRB localized by INTEGRAL
  49. IPN confirmation of the reactivation of SGR1900+14
  50. GRB021113, SPI ACS observation
  51. GRB 021112: Afterglow or Variable Star?
  52. GRB021113: optical observations at Bisei
  53. GRB 021113: Evidence for a Dark Optical Afterglow
  54. GRB021112, BVRI field photometry
  55. GRB 021112: Variable Source in R-band search
  56. GRB021112: Optical Observations
  57. IPN triangulation of GRB021113 (=H2449; annulus)
  58. GRB 021113: Optical observations
  59. GRB 021112: RAPTOR Observations
  60. GRB021113 (=H2449): A Long GRB Localized by HETE
  61. GRB021112 (=H2448): A Long GRB Localized by HETE
  62. GRB 021016: Optical Observations
  63. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  64. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  65. SGR1900+14 activity, November 2-4, 2002
  66. GRB021104: optical observations
  67. Detection of activity from SGR 1900+14 with the RXTE/PCA
  68. IPN triangulation of GRB021027 (single large error box)
  69. IPN triangulation of GRB021027 (two large error boxes)
  70. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  71. GRB 021004: optical observations
  72. IPN triangulation of GRB021023 (small error boc)
  73. GRB 020813; likely host galaxy.
  74. IPN triangulation of GRB021020 (smaller error box)
  75. IPN triangulation of GRB021020
  76. GRB 021008, optical observations
  77. IPN triangulation of GRB021016 (small error box)
  78. IPN triangulation of GRB021014 (large error box)
  79. IPN triangulation of GRB021013 (single error box)
  80. GRB 021004: optical spectroscopy on Oct 11
  81. IPN triangulation of GRB021013 (two small error boxes)
  82. GRB021004: High-resolution optical spectroscopy
  83. XRF 020903: flattening of the optical light curve.
  84. GRB021004, UBVRcIc field photometry update
  85. IPN triangulation of GRB021008 (single error box)
  86. GRB 021004 submm observations
  87. IPN triangulation of GRB021008 (two small error boxes)
  88. GRB021004 Chandra HETG Observations
  89. GRB 021004: Optical/NIR Observations
  90. GRB 021004: Additional V-band Polarimetric Observations
  91. GRB021004: optical observation
  92. GRB 021004: Host Galaxy Star Formation Rate
  93. GRB 021004 submm observations
  94. GRB 021004: WC wind?
  95. GRB021004: NIR and Optical observations
  96. GRB 021004: Optical observations, AUDE network
  97. GRB 021004 - VLA Radio Observations
  98. GRB 021004 - Unusual Radio-to-Submm Spectrum
  99. GRB 021004: optical spectroscopy
  100. IPN triangulation of GRB021007 (annulus)

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