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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.

Advanced Search Examples (click to copy):

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

295 results found.

  1. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  2. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  3. GRB 130511A: SSO 2.3m observation
  4. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  5. GRB 130427A: photo-z of possible SDSS host galaxy
  6. GRB 130420B: Faulkes Telescope North observations
  7. GRB 130102A: Swift/UVOT Upper Limits
  8. GRB 121229A: GROND detection of the afterglow
  9. GRB 121217A: Swift/UVOT Detection
  10. GRB121212A: Swift/UVOT Detection
  11. GRB 121028A: Swift/UVOT Upper Limits
  12. GRB 121012A: Fermi GBM detection
  13. GRB 120328A: Swift/UVOT Upper Limits
  14. GRB 120305A: Swift/UVOT Upper Limits
  15. AXP 4U 1042+61: Mondy optical observations
  16. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  17. Swift detection of an SGR burst from AXP 4U 0142+61
  18. GRB 111107A: Swift/UVOT Afterglow Analysis
  19. GRB 111022B: MITSuME Akeno Optical upper limits
  20. GRB 111016A: Swift-BAT refined analysis
  21. GRB 110921A: Swift/UVOT Observations
  22. GRB 110915A: Swift/UVOT Upper Limits
  23. AXP 4U 0142+61: Fermi GBM detection
  24. AXP 4U 0142+61: Swift-BAT refined analysis
  25. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  26. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  27. GRB 110420B: Swift/UVOT Upper Limits
  28. Swift/UVOT observations of GRB110223b
  29. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  30. GRB 101008A: MASTER prompt optical observations
  31. GRB 100909A: Faulkes Telescope North afterglow candidate
  32. GRB 100905A: Swift/UVOT Upper Limits
  33. GRB 100823A: Candidate IR afterglow
  34. Swift-BAT refined analysis of trigger 421262
  35. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  36. GRB 100413A: Faulkes Telescope South observations
  37. GRB 100206A: Swift/UVOT Upper Limits
  38. GRB 090814B: Liverpool Telescope Observations
  39. GRB090423 - Swift/UVOT upper limits.
  40. GRB 090419: Swift/UVOT Observations
  41. GRB 090417B: Gemini imaging
  42. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  43. ATCA observation of SGR J1550-5418
  44. Konus-RF catches first GRB and SGR bursts
  45. SGR J1550-5418
  46. Ongoing activity of AXP/SGR 1E1547.0-5408
  47. SGR activity seen by BAT during ICSP Ionospheric Events
  48. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  49. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  50. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  51. IBAS Alert N. 5442 is not a GRB
  52. Suzaku ToO Observation of AXP 1E 1547.0-5408
  53. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  54. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  55. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  56. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  57. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  58. Swift-BAT trigger 340734 is not a GRB
  59. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  60. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  61. AXP 1E1547.0-5408: Fermi GBM observations
  62. Trigger 340734: Swift detection of a possible short burst
  63. AXP 1E1547.0-5408 activity with SGR bursts
  64. Swift/UVOT observations of GRB 081221
  65. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  66. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  67. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  68. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  69. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  70. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  71. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  72. Trigger 330353: Swift detection of a Galactic short soft burst
  73. GRB 071021: Magellan R-band observation
  74. GRB 071017: a SHORT GRB detected by INTEGRAL
  75. Swift/UVOT refined analysis of GRB070529
  76. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  77. GRB 060522: Swift/XRT Team refined analysis
  78. GRB 060202: Swift XRT Team Refined Analysis
  79. GRB050915: P60 Optical Observations
  80. IPN detection of continued activity from SGR1806-20
  81. GRB 030329 Optical Observations
  82. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  83. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  84. AXP 1E2259+586: quasi-simultaneous optical observation
  85. AXP 1E2259+586 optical observations
  86. SGR-like Bursts from the AXP 1E 2259+586
  87. GRB010923 as seen by BeppoSAX GRBM
  88. GRB Observation Report
  89. GRB990705, VLT-FORS1 observations of the host galaxy
  90. Optical observations of GRB000210
  91. GRB 000210: BATSE Observations
  92. GRB000210, Radio Observations
  93. IPN triangulation of GRB000210
  94. GRB991216 Optical and IR observations
  95. GRB 981220, radio observations

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