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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').
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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"

3874 results found.

  1. GRB 111228A: PAIRITEL NIR Detection
  2. GRB 111228A: GROND observations
  3. GRB 111228A: GRAS017 optical observations
  4. GRB 111228A: NOT optical observation
  5. GRB 111215A: Keck/LRIS Imaging
  6. IPN Triangulation of GRB 111222A (short/hard/intense)
  7. GRB 111215A: EVLA observations
  8. GRB111215A: CARMA Detection
  9. GRB 111103B: optical upper limit
  10. GRB 111215A: Enhanced Swift-XRT position
  11. GRB 111215A: Swift detection of a burst
  12. GRB 111129A: Swift/UVOT Detection
  13. GRB 111129A: Swift detection of a burst with an optical counterpart
  14. GRB 111126A found in ground analysis of BAT data
  15. GRB 111022B: MASTER OT observations
  16. GRB 111029A: SAO RAS optical limits
  17. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  18. GRB 111029A: PAIRITEL NIR Upper Limits
  19. GRB 111029A: optical upper limit
  20. GRB 111026A: Swift detection of a burst
  21. GRB 111022A: MASTER-Net early limit
  22. GRB 110825A: GROND Observations
  23. GRB 110924A: Swift detection of a possible burst
  24. GRB110918A: Lick Observations
  25. GRB 110918A: INT optical detection of Swift candidate afterglow
  26. Swift detection of short bursts from PSR J1647-4552
  27. GRB 110915A: MITSuME Akeno Optical upper limits
  28. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  29. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  30. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  31. Swift detection of an SGR burst from Swift J1834.9-0846
  32. Swift-BAT Trigger 501485 is noise
  33. GRB 110818A, Swift-BAT refined analysis
  34. SGR 1834.9-0846/ GRB 110807A, I-band observations
  35. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  36. SGR J1834.9-0846: A Neutron Star in W41?
  37. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  38. Fermi GBM detection of a SGR-like burst
  39. GRB 110807A: Swift detection of a burst or a posible new SGR
  40. GRB 110726A: two epochs of SAO RAS optical observations
  41. GRB 110801A: MASTER OT observations
  42. AXP 4U 0142+61: Fermi GBM detection
  43. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  44. GRB 110719A: GRT Optical Observation
  45. GRB 110719A: optical limit by "Pi of the Sky"
  46. Swift J1822.3-1606
  47. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  48. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  49. GRB 110709B: Preliminary Swift-BAT refined analysis
  50. GRB 110709B: Swift detection of a burst
  51. GRB 110709A: MASTER-NET optical observations
  52. GRB 110709A: Swift detection of a burst
  53. Swift trigger 456780 is not a burst
  54. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  55. SGR 1E 1841-045: Swift-BAT refined analysis
  56. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  57. SGR 1E 1841-045: Swift-BAT refined analysis
  58. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  59. GRB 110529A: Suzaku WAM observation of the prompt emission
  60. GRB 110530A: Swift-XRT refined Analysis
  61. GRB 110529A: Fermi GBM detection
  62. LAT Observations of GRB110529A
  63. GRB 110520A: MASTER-NET optical observations
  64. GRB 110519A: Swift detection of a burst
  65. GRB 110412A: Swift-BAT refined analysis
  66. GRB 110411A: MASTER prompt and follow-up optical limits
  67. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  68. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  69. GRB 110406A: Positional coincidence with NGC 404
  70. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  71. GRB 110402A afterglow observation
  72. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  73. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  74. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  75. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  76. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  77. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  78. GRB 110328B: Fermi-LAT Detection
  79. GRB 110328B: Fermi GBM detection
  80. GRB 110301A: Fermi GBM detection
  81. Fermi GBM detection of an SGR-like burst
  82. GRB 110213A: YNAO-GMG Observations
  83. GRB 110213B: MAXI/GSC refined analysis
  84. GRB 110213A: Swift detection of a burst with optical afterglow
  85. GRB 110208A: Potential afterglow from Magellan
  86. SGR-like outburst from the magnetar 1E 1841-04.5
  87. GRB 110205A: Lightbuckets Optical Observations
  88. GRB110205A: MITSuME Ishigakijima Optical Observation
  89. GRB 110205A: Swift-BAT refined analysis
  90. GRB 110112A: MASTER optical observations
  91. GRB 110112A: Swift detection of a possible short burst
  92. Short GRB 110106A: MASTER OT observations
  93. GRB 101219A: Swift detection of a short hard burst
  94. GRB 101129A : Suzaku WAM observation of the prompt emission
  95. GRB 101204A detected in ground analysis of BAT data
  96. GRB101030A
  97. Swift detection of MAXIJ1409-619
  98. Fermi GBM detection of a burst from a galactic source
  99. GRB 10112A: MASTER optical observations
  100. GRB 090113, the review of the sky area in plate archives

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