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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"

42458 results found.

  1. GRB 110825A: GROND Observations
  2. GRB 110928A: Enhanced Swift-XRT position
  3. GRB 110928A: P60 Observations
  4. GRB 110928A: Further PAIRITEL NIR Observations
  5. GRB 110928A: Swift-BAT refined analysis
  6. GRB 110928A: Swift-XRT observations
  7. GRB 110928A: Swift/UVOT finding chart observation
  8. GRB 110928A: PAIRITEL NIR Observations
  9. GRB 110928A: ROTSE-III Optical Limits
  10. GRB 110928A: Swift detection of a burst
  11. GRB 110924A: Swift detection of a possible burst
  12. GCN for GRB 110921B
  13. GRB 110921A: Swift/UVOT Observations
  14. GRB110918A: Lick Observations
  15. GRB 110921A: NOT observations
  16. GRB 110921A: Fermi GBM observation
  17. GRB 110921A: TNT astrometry
  18. GRB 110921A: Swift-XRT refined Analysis
  19. GRB 110921A, Swift-BAT refined analysis
  20. GRB 110918A: Liverpool Telescope optical observations
  21. GRB 110918A: submm observations from APEX
  22. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  23. GRB 110921A: Enhanced Swift-XRT position
  24. GRB 110921A: MITSuME Akeno Optical Observation
  25. GRB 110921A : TNT optical counterpart candidate
  26. GRB 110918A: Swift-XRT refined Analysis
  27. GRB 110918A: Spectroscopy from GTC
  28. GRB 110921A: MASTER-Net early limit
  29. GRB 110921A: Swift detection of a burst
  30. GRB 110915B : X-ray afterglow confirmation
  31. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  32. GRB 110918A: rest-frame energetics in gamma-gays
  33. GRB 110918A optical observation
  34. GRB 110918A: Gemini-N redshift
  35. GRB 110918A: Afterglow Confirmation from PTF
  36. GRB 110918A: GROND detection of the afterglow candidate
  37. GRB 110918A: INT optical detection of Swift candidate afterglow
  38. GRB 110918A: Swift-XRT observations
  39. Konus-Wind observation of GRB 110918A
  40. GRB110918A: BOOTES-1 optical limit
  41. MAXI/GSC detection of a short soft X-ray transient
  42. Swift detection of short bursts from PSR J1647-4552
  43. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  44. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  45. GRB 110915A: Swift/UVOT Upper Limits
  46. GRB 110915B: Swift/UVOT Upper Limits
  47. GRB 110915A: GROND Upper limits
  48. GRB 110915A, Swift-BAT refined analysis
  49. GRB 110915A: Swift-XRT refined Analysis
  50. GRB 110915B: Afterglow candidate from OSN
  51. GRB 110915A: Deep Near-IR Limits from Magellan
  52. GRB 110915B: XRT afterglow candidate
  53. GRB 110903A: Suzaku WAM observation of the prompt emission
  54. GRB 110915A: Deep Gemini-South i/z-band imaging
  55. GRB110915A MITSuME Okayama J-band upper-limit
  56. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  57. GRB 110915A: NOT observations
  58. GRB 110915A: 1.23m CAHA I-band observations
  59. GRB 110915B: SuperAGILE localization of a long GRB
  60. GRB 110915A: Enhanced Swift-XRT position
  61. GRB 110915A: GMG optical upper limit
  62. GRB 110915A: MITSuME Akeno Optical upper limits
  63. GRB 110915A: MASTER-Net early limit
  64. GRB 110915A: Prompt enhanced Swift-XRT position
  65. GRB 110915A: Swift detection of a burst
  66. GRB 110825A: Further Swift/XRT Observations
  67. GRB 110731A: SAO RAS and Terskol observations
  68. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  69. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  70. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  71. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  72. GRB 110905A: KAIT observations
  73. GRB 110905A: Swift detection of a burst
  74. GRB 110903A: Fermi GBM observation
  75. GRB 110903A: Swift/UVOT Upper Limits
  76. GRB 110903A: Swift-XRT observations
  77. Konus-Wind observation of GRB 110903A
  78. GRB 110903A: a long GRB detected by INTEGRAL
  79. GRB 110820A: optical upper limit
  80. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  81. Trigger 502024: Swift detection of KS 1741-293
  82. GRB110825A: Fermi GBM observation
  83. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  84. Swift detection of an SGR burst from Swift J1834.9-0846
  85. GRB 110825A: Suzaku WAM observation of the prompt emission
  86. GRB 110825A: GMG optical observation
  87. GRB110825A: ROTSE early time optical limit
  88. GRB 110827A, Swift-BAT refined analysis
  89. GRB 110825A: optical afterglow candidate
  90. GRB 110827A: Swift detection of a burst
  91. GRB 110825A: field inspection and possible host galaxy
  92. GRB110825A: Swift target of opportunity observation
  93. GRB 110820A, the review of the sky area in plate archives
  94. Swift-BAT Trigger 501485 is noise
  95. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  96. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  97. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  98. GRB 110820A: Swift/UVOT Upper Limits
  99. GRB 110820A: Position udpate + 2nd epoch data
  100. GRB 110820A: CQUEAN izY Observation

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