Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

32573 results found.

  1. GRB 240125A: AstroSat CZTI detection of a short burst
  2. GRB 240123C: AstroSat CZTI detection
  3. GRB240122A: PRIME near infrared detection
  4. GRB 240123B: Fermi GBM Observation
  5. GRB 240123A: Glowbug gamma-ray detection
  6. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  7. GRB 240123A: GRBAlpha detection
  8. IPN triangulation of GRB 240123C (short)
  9. Fermi-LAT gamma-ray observations of IceCube-240123A
  10. GRB 240123A: further SAO RAS optical observations
  11. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  12. GRB 240123A: Swift-BAT refined analysis
  13. GRB 240123A: Mondy continued optical observations and the PL decay index
  14. GRB 240123A: SAO RAS optical observations
  15. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  16. Fermi/GBM trigger 727752941: BALROG analysis retraction
  17. Fermi GRB 240123B: Global MASTER-Net observations report
  18. GRB 240122A: Swift/UVOT Upper Limits
  19. Fermi GBM Sub-Threshold Detection of GRB 240123A
  20. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  21. GRB 240118A: Swift/UVOT Upper Limits
  22. GRB 240123A: Mondy optical afterglow observations
  23. Konus-Wind detection of GRB 240112A
  24. GRB 240122A: Swift-XRT afterglow detection
  25. GRB 240122A: VLT/X-shooter redshift confirmation
  26. GRB 240122A: Redshift from OSIRIS+/GTC
  27. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  28. GRB 240122A: GOTO optical counterpart candidate
  29. GRB 240122A: Tiled Swift observations
  30. Konus-Wind detection of GRB 240119A (short/hard)
  31. IPN triangulation of GRB 240119A (short)
  32. GRB 240119A: GECAM detection of a short burst
  33. GRB 240118C: GECAM-B detection of a long burst
  34. GRB 240119A: AstroSat CZTI detection of a short burst
  35. GRB 240118A: Mondy optical observations
  36. GRB 240118C: Fermi GBM Observation
  37. Fermi GRB 240119A: Global MASTER-Net observations report
  38. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  39. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  40. GRB 240118A: GRBAlpha detection
  41. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  42. GRB 240115A: Fermi GBM Observation
  43. GRB 240117A: AstroSat CZTI detection
  44. GRB 240118A: Swift ToO observations
  45. GRB 240118A: AbAO optical upper limit
  46. Fermi GRB 240118B: Global MASTER-Net observations report
  47. GRB 240118A: NuSTAR Offline Analysis of the GRB
  48. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  49. Konus-Wind detection of GRB 240118A
  50. GRB 240118A: NuSTAR Detection of a Long GRB
  51. GRB 240118A: Fermi GBM Observation
  52. GRB 240118A: Fermi-LAT detection
  53. GRID detection of GRB 231230A
  54. IPN triangulation of GRB 240112A (long)
  55. Swift Triggers 1209371 through 1209374 are not astrophysical events
  56. Swift Triggers 1209369 and 1209370 are not astrophysical events
  57. GRB 240115B: AstroSat CZTI detection
  58. GRB 240115B: Fermi GBM Detection
  59. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  60. GRB 240112D: Glowbug gamma-ray detection
  61. GRB 240112C: Glowbug gamma-ray detection
  62. GRB 240112C: VZLUSAT-2 detection
  63. GRB 240107A: VZLUSAT-2 detection
  64. Fermi GRB 240115B: Global MASTER-Net observations report
  65. GRB 240115B: A long GRB detected by INTEGRAL
  66. Konus-Wind detection of GRB 240112C
  67. Fermi GRB 240115A: Global MASTER-Net observations report
  68. GRB 240112C: GRBAlpha detection
  69. GRB 240112C: Swift/UVOT Detection
  70. GRB 240112C: Fermi GBM Detection
  71. GRB 240112C: SAO RAS optical observations
  72. Fermi GRB 240112D: Global MASTER-Net observations report
  73. Swift GRB 240112C: Global MASTER-Net observations report
  74. Fermi GRB 240112B: Global MASTER-Net observations report
  75. GRB 240109A: Swift-BAT refined analysis
  76. GRB 240109A: Fermi GBM Observation
  77. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  78. GRB 231214A: ATCA Radio Upper Limits
  79. GRB 240106B: Glowbug gamma-ray detection
  80. GRB 240106A: Glowbug gamma-ray detection
  81. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  83. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  84. Konus-Wind detection of GRB 240101C
  85. GRB 231215A: radio detection with the VLA
  86. GRB 230818A: further radio observations with the VLA
  87. GRB 230812B: further radio observations with the VLA
  88. GRB 240107A: AstroSat CZTI detection
  89. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  90. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  91. Update of IceCube-240105A - Corrected errors
  92. GRB 240106A: GRBAlpha detection
  93. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  94. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  95. IPN triangulation of GRB 240101C (short)
  96. GRB GRB240101C: Fermi GBM observation
  97. GRB 240101A: 1.3m DFOT optical observations
  98. GRB 240102A: 1.3m DFOT optical upper limit
  99. GRB 240101B: 1.3m DFOT optical upper limit
  100. GRB 240101C: Swift/BAT-GUANO detection of a short burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov