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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28040 results found.

  1. GRB030131: corrected INTEGRAL position
  2. GRB 020819: Host galaxy at Radio Position
  3. IPN triangulation of GRB030131
  4. GRB 030131 optical observations
  5. GRB 030131 optical observations
  6. A long GRB detected by INTEGRAL
  7. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  8. GRB 030115, simultaneous observations by BOOTES-1
  9. GRB 030115: IR observations with IRSF/SIRIUS
  10. IPN triangulation of GRB030115C (large error box)
  11. GRB030115, afterglow candidate
  12. GRB 021211: R-band observations at late-time
  13. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  14. GRB 030115 : Possible IR counterpart
  15. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  16. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  17. GRB 030115: APO Optical Observations
  18. Information about where HETE will be pointing
  19. VLT spectroscopy of the probable host of GRB 021211
  20. IPN triangulation of GRB030101 (two large error boxes)
  21. GRB 021211: Probable Host and Underlying Supernova
  22. GRB 021112: Evidence for Another Dark Optical Afterglow
  23. GRB 021219: OSN optical observations
  24. GRB021219, optical observations
  25. GRB021219, optical observation by MASTER
  26. VLT spectra of GRB 021211 revisited
  27. GRB021219: a long GRB localized by INTEGRAL
  28. GRB021211: APO optical observations
  29. XRF 020903 : HST observations
  30. GRB 021201: Optical Observations
  31. GRB 021211: CTIO observations
  32. GRB021211, BVRI field photometry
  33. GRB021211: Optical observations in CrAO
  34. GRB 021211, optical observations
  35. GRB021211: Kiso Observations
  36. GRB 021201, optical observations
  37. GRB021211: Optical observations
  38. GRB 021201 (short/hard), NOT observations
  39. SUB-MM SEARCH FOR GRB 021211
  40. Chandra observation of the IPN error box of GRB021201 (short/hard)
  41. GRB 021211, R- and I-band observations
  42. GRB021211 - Upper limits from recent and historical observations
  43. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  44. IPN triangulation of GRB021206 (small error box)
  45. IPN triangulation of GRB021205 (large error box)
  46. GRB021201, BVRcIc field photometry
  47. GRB 021201: BOOTES simultaneous optical observations
  48. IPN triangulation of GRB021201 (short/hard burst, small error box)
  49. GRB021004, late time optical observations
  50. GRB021004 Chandra Observation
  51. IPN detection of continued SGR1900+14 activity
  52. Improved IPN error box for GRB021125
  53. IPN BURST POSITION
  54. IPN triangulation of GRB021125 (INTEGRAL BURST)
  55. GRB021125 : A long GRB localized by INTEGRAL
  56. IPN confirmation of the reactivation of SGR1900+14
  57. GRB021113, SPI ACS observation
  58. GRB 021112: Afterglow or Variable Star?
  59. GRB021113: optical observations at Bisei
  60. GRB 021113: Evidence for a Dark Optical Afterglow
  61. GRB021112, BVRI field photometry
  62. GRB 021112: Variable Source in R-band search
  63. GRB021112: Optical Observations
  64. IPN triangulation of GRB021113 (=H2449; annulus)
  65. GRB 021113: Optical observations
  66. GRB 021112: RAPTOR Observations
  67. GRB021113 (=H2449): A Long GRB Localized by HETE
  68. GRB021112 (=H2448): A Long GRB Localized by HETE
  69. GRB 021016: Optical Observations
  70. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  71. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  72. SGR1900+14 activity, November 2-4, 2002
  73. GRB021104: optical observations
  74. Detection of activity from SGR 1900+14 with the RXTE/PCA
  75. IPN triangulation of GRB021027 (single large error box)
  76. IPN triangulation of GRB021027 (two large error boxes)
  77. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  78. GRB 021004: optical observations
  79. IPN triangulation of GRB021023 (small error boc)
  80. GRB 020813; likely host galaxy.
  81. IPN triangulation of GRB021020 (smaller error box)
  82. IPN triangulation of GRB021020
  83. GRB 021008, optical observations
  84. IPN triangulation of GRB021016 (small error box)
  85. IPN triangulation of GRB021014 (large error box)
  86. IPN triangulation of GRB021013 (single error box)
  87. GRB 021004: optical spectroscopy on Oct 11
  88. IPN triangulation of GRB021013 (two small error boxes)
  89. GRB021004: High-resolution optical spectroscopy
  90. XRF 020903: flattening of the optical light curve.
  91. GRB021004, UBVRcIc field photometry update
  92. IPN triangulation of GRB021008 (single error box)
  93. GRB 021004 submm observations
  94. IPN triangulation of GRB021008 (two small error boxes)
  95. GRB021004 Chandra HETG Observations
  96. GRB 021004: Optical/NIR Observations
  97. GRB 021004: Additional V-band Polarimetric Observations
  98. GRB021004: optical observation
  99. GRB 021004: Host Galaxy Star Formation Rate
  100. GRB 021004 submm observations

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