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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"

28232 results found.

  1. GRB 030115: IR observations with IRSF/SIRIUS
  2. IPN triangulation of GRB030115C (large error box)
  3. GRB030115, afterglow candidate
  4. GRB 021211: R-band observations at late-time
  5. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  6. GRB 030115 : Possible IR counterpart
  7. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  8. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  9. GRB 030115: APO Optical Observations
  10. Information about where HETE will be pointing
  11. VLT spectroscopy of the probable host of GRB 021211
  12. IPN triangulation of GRB030101 (two large error boxes)
  13. GRB 021211: Probable Host and Underlying Supernova
  14. GRB 021112: Evidence for Another Dark Optical Afterglow
  15. GRB 021219: OSN optical observations
  16. GRB021219, optical observations
  17. GRB021219, optical observation by MASTER
  18. VLT spectra of GRB 021211 revisited
  19. GRB021219: a long GRB localized by INTEGRAL
  20. GRB021211: APO optical observations
  21. XRF 020903 : HST observations
  22. GRB 021201: Optical Observations
  23. GRB 021211: CTIO observations
  24. GRB021211, BVRI field photometry
  25. GRB021211: Optical observations in CrAO
  26. GRB 021211, optical observations
  27. GRB021211: Kiso Observations
  28. GRB 021201, optical observations
  29. GRB021211: Optical observations
  30. GRB 021201 (short/hard), NOT observations
  31. SUB-MM SEARCH FOR GRB 021211
  32. Chandra observation of the IPN error box of GRB021201 (short/hard)
  33. GRB 021211, R- and I-band observations
  34. GRB021211 - Upper limits from recent and historical observations
  35. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  36. IPN triangulation of GRB021206 (small error box)
  37. IPN triangulation of GRB021205 (large error box)
  38. GRB021201, BVRcIc field photometry
  39. GRB 021201: BOOTES simultaneous optical observations
  40. IPN triangulation of GRB021201 (short/hard burst, small error box)
  41. GRB021004, late time optical observations
  42. GRB021004 Chandra Observation
  43. IPN detection of continued SGR1900+14 activity
  44. Improved IPN error box for GRB021125
  45. IPN BURST POSITION
  46. IPN triangulation of GRB021125 (INTEGRAL BURST)
  47. GRB021125 : A long GRB localized by INTEGRAL
  48. IPN confirmation of the reactivation of SGR1900+14
  49. GRB021113, SPI ACS observation
  50. GRB 021112: Afterglow or Variable Star?
  51. GRB021113: optical observations at Bisei
  52. GRB 021113: Evidence for a Dark Optical Afterglow
  53. GRB021112, BVRI field photometry
  54. GRB 021112: Variable Source in R-band search
  55. GRB021112: Optical Observations
  56. IPN triangulation of GRB021113 (=H2449; annulus)
  57. GRB 021113: Optical observations
  58. GRB 021112: RAPTOR Observations
  59. GRB021113 (=H2449): A Long GRB Localized by HETE
  60. GRB021112 (=H2448): A Long GRB Localized by HETE
  61. GRB 021016: Optical Observations
  62. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  63. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  64. SGR1900+14 activity, November 2-4, 2002
  65. GRB021104: optical observations
  66. Detection of activity from SGR 1900+14 with the RXTE/PCA
  67. IPN triangulation of GRB021027 (single large error box)
  68. IPN triangulation of GRB021027 (two large error boxes)
  69. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  70. GRB 021004: optical observations
  71. IPN triangulation of GRB021023 (small error boc)
  72. GRB 020813; likely host galaxy.
  73. IPN triangulation of GRB021020 (smaller error box)
  74. IPN triangulation of GRB021020
  75. GRB 021008, optical observations
  76. IPN triangulation of GRB021016 (small error box)
  77. IPN triangulation of GRB021014 (large error box)
  78. IPN triangulation of GRB021013 (single error box)
  79. GRB 021004: optical spectroscopy on Oct 11
  80. IPN triangulation of GRB021013 (two small error boxes)
  81. GRB021004: High-resolution optical spectroscopy
  82. XRF 020903: flattening of the optical light curve.
  83. GRB021004, UBVRcIc field photometry update
  84. IPN triangulation of GRB021008 (single error box)
  85. GRB 021004 submm observations
  86. IPN triangulation of GRB021008 (two small error boxes)
  87. GRB021004 Chandra HETG Observations
  88. GRB 021004: Optical/NIR Observations
  89. GRB 021004: Additional V-band Polarimetric Observations
  90. GRB021004: optical observation
  91. GRB 021004: Host Galaxy Star Formation Rate
  92. GRB 021004 submm observations
  93. GRB 021004: WC wind?
  94. GRB021004: NIR and Optical observations
  95. GRB 021004: Optical observations, AUDE network
  96. GRB 021004 - VLA Radio Observations
  97. GRB 021004 - Unusual Radio-to-Submm Spectrum
  98. GRB 021004: optical spectroscopy
  99. IPN triangulation of GRB021007 (annulus)
  100. GRB021004: optical observations and predicted break time

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